Add interface2

interface2/README.md

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+# interface2
+
+Modern interface using a Lattice iCE40 FPGA and STM32 microcontroller.
+
+![interface2 assembled](.images/hero.jpg)
+
+## Hardware
+
+You can find a [complete BOM](https://octopart.com/bom-tool/S80JaI18) on Octopart.
+
+You can find the Gerber files for fabricating a PCB in the [fabrication](pcb/fabrication) directory. I have used JLCPCB to make the PCBs.
+
+## FPGA
+
+For now, the FPGA bitstream must be built using Lattice iCEcube2.
+
+```
+cd fpga
+make
+```
+
+Uses FIFO module from [Sylvain Munaut](https://github.com/smunaut).
+
+## Firmware
+
+The firmware currently provides the ability to send commands and receive responses - it is designed to implement a terminal controller, not a terminal.
+
+You will need [PlatformIO](https://platformio.org/) to build and upload the firmware, only Platform IO Core (the CLI) is required.
+
+Before building the firmware, you will need to generate the FPGA bitstream; see the steps above.
+
+To build and upload the firmware using USB DFU:
+
+```
+cd firmware
+platformio run -t upload
+```

interface2/firmware/.gitignore

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+.pio
+src/bitstream.inc

interface2/firmware/boards/stm32l443cc.json

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+{
+  "build": {
+    "cpu": "cortex-m4",
+    "extra_flags": "-DSTM32L443xx",
+    "f_cpu": "80000000L",
+    "mcu": "stm32l443ccu6",
+    "product_line": "stm32l443xx",
+    "variant": "STM32L443CC"
+  },
+  "connectivity": [
+  ],
+  "debug": {
+    "default_tools": [
+      "stlink"
+    ],
+    "jlink_device": "STM32L443CC",
+    "onboard_tools": [
+      "stlink"
+    ],
+    "openocd_board": "xxx",
+    "svd_path": "STM32L4x3.svd"
+  },
+  "frameworks": [
+    "stm32cube"
+  ],
+  "name": "STM32L443CC",
+  "upload": {
+    "maximum_ram_size": 65536,
+    "maximum_size": 262144,
+    "protocol": "stlink",
+    "protocols": [
+      "dfu",
+      "stlink"
+    ]
+  },
+  "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32l443cc.html",
+  "vendor": "ST"
+}

interface2/firmware/generate_bitstream_inc.sh

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+#!/bin/bash
+
+BITSTREAM=../fpga/rtl/top.bin
+
+if [ ! -f $BITSTREAM ]; then
+    echo "Bitstream '$BITSTREAM' not found." >&2
+    exit 1
+fi
+
+if [ ! $BITSTREAM -nt "src/bitstream.inc" ]; then
+    echo "Bitstream '$BITSTREAM' is not newer than generated include file, skipping." >&2
+    exit
+fi
+
+xxd -i $BITSTREAM | tail -n +2 | head -n -2 > src/bitstream.inc

interface2/firmware/include/coax.h

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+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+#include <cstdint>
+#include <cstddef>
+
+#define COAX_ERROR_TX_RECEIVER_ACTIVE -1
+#define COAX_ERROR_TX_UNDERFLOW -2
+
+#define COAX_ERROR_RX_LOSS_OF_MID_BIT_TRANSITION -1
+#define COAX_ERROR_RX_PARITY -2
+#define COAX_ERROR_RX_INVALID_END_SEQUENCE -4
+#define COAX_ERROR_RX_OVERFLOW -8
+#define COAX_ERROR_RX_UNKNOWN -513
+
+#define COAX_ERROR_NOT_INITIALIZED -1024
+
+enum class CoaxParity
+{
+    Odd = 0,
+    Even = 1
+};
+
+class SPICoaxTransceiver;
+
+class Coax
+{
+public:
+    Coax(SPICoaxTransceiver &spiCoaxTransceiver, CoaxParity parity,
+            volatile uint16_t *buffer, size_t bufferSize);
+
+    bool init();
+
+    void reset();
+
+    int transmit(const uint16_t *buffer, size_t bufferCount);
+    int receive(uint16_t *buffer, size_t bufferSize, uint16_t timeout);
+
+    void handleInterrupt();
+
+private:
+    SPICoaxTransceiver &_spiCoaxTransceiver;
+    CoaxParity _parity;
+
+    bool _isInitialized;
+
+    volatile enum {
+        COAX_INTERRUPT_STATE_IDLE,
+        COAX_INTERRUPT_STATE_DISABLED,
+        COAX_INTERRUPT_STATE_RECEIVING,
+        COAX_INTERRUPT_STATE_RECEIVED,
+        COAX_INTERRUPT_STATE_ERROR
+    } _interruptState = COAX_INTERRUPT_STATE_DISABLED;
+
+    volatile uint16_t *_buffer;
+    size_t _bufferSize;
+    volatile size_t _bufferCount = 0;
+    volatile int _error = 0;
+};
+
+#define COAX_REGISTER_STATUS 0x1
+#define COAX_REGISTER_STATUS_RX_ERROR 0x40
+#define COAX_REGISTER_STATUS_RX_ACTIVE 0x20
+#define COAX_REGISTER_STATUS_TX_COMPLETE 0x08
+#define COAX_REGISTER_STATUS_TX_ACTIVE 0x04
+
+#define COAX_REGISTER_CONTROL 0x2
+#define COAX_REGISTER_CONTROL_LOOPBACK 0x01
+#define COAX_REGISTER_CONTROL_TX_PARITY 0x08
+#define COAX_REGISTER_CONTROL_RX_PARITY 0x40
+
+#define COAX_REGISTER_DEVICE_ID 0xf
+
+class SPICoaxTransceiver
+{
+public:
+    SPICoaxTransceiver();
+
+    bool init();
+
+    void reset();
+
+    uint8_t readRegister(uint8_t index);
+    void writeRegister(uint8_t index, uint8_t value, uint8_t mask);
+
+    int transmit(const uint16_t *buffer, size_t bufferCount);
+    int receive(uint16_t *buffer, size_t bufferSize);
+
+    void setLoopback(bool loopback);
+    void setTXParity(CoaxParity parity);
+    void setRXParity(CoaxParity parity);
+
+    inline bool isTXComplete()
+    {
+        return readRegister(COAX_REGISTER_STATUS) & COAX_REGISTER_STATUS_TX_COMPLETE;
+    }
+
+    inline bool isRXActive()
+    {
+        return readRegister(COAX_REGISTER_STATUS) & COAX_REGISTER_STATUS_RX_ACTIVE;
+    };
+
+private:
+    void spiTransfer(const uint8_t *transmitBuffer, uint8_t *receiveBuffer, size_t count);
+};

interface2/firmware/include/config.h

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+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+// The coax buffer size is based on the maximum receive size, which as a
+// controller should be limited.
+#define COAX_BUFFER_SIZE 32
+
+// The message buffer size is based on the maximum conceivable coax write
+// data command length which in turn assumes a maximum regen and EAB buffer
+// being written in a single command.
+#define MAX_COAX_WRITE_SIZE (1 + (3696 * 2))
+
+#define MESSAGE_BUFFER_SIZE ((MAX_COAX_WRITE_SIZE * sizeof(uint16_t)) + 32)

interface2/firmware/include/cubemx/main.h

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+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : main.h
+  * @brief          : Header for main.c file.
+  *                   This file contains the common defines of the application.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __MAIN_H
+#define __MAIN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32l4xx_hal.h"
+#include "stm32l4xx_ll_crs.h"
+#include "stm32l4xx_ll_rcc.h"
+#include "stm32l4xx_ll_bus.h"
+#include "stm32l4xx_ll_system.h"
+#include "stm32l4xx_ll_exti.h"
+#include "stm32l4xx_ll_cortex.h"
+#include "stm32l4xx_ll_utils.h"
+#include "stm32l4xx_ll_pwr.h"
+#include "stm32l4xx_ll_dma.h"
+#include "stm32l4xx_ll_spi.h"
+#include "stm32l4xx_ll_gpio.h"
+
+/* Private includes ----------------------------------------------------------*/
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* Exported types ------------------------------------------------------------*/
+/* USER CODE BEGIN ET */
+
+/* USER CODE END ET */
+
+/* Exported constants --------------------------------------------------------*/
+/* USER CODE BEGIN EC */
+
+/* USER CODE END EC */
+
+/* Exported macro ------------------------------------------------------------*/
+/* USER CODE BEGIN EM */
+
+/* USER CODE END EM */
+
+/* Exported functions prototypes ---------------------------------------------*/
+void Error_Handler(void);
+
+/* USER CODE BEGIN EFP */
+
+/* USER CODE END EFP */
+
+/* Private defines -----------------------------------------------------------*/
+/* USER CODE BEGIN Private defines */
+
+/* USER CODE END Private defines */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __MAIN_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/stm32_assert.h

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+/**
+  ******************************************************************************
+  * @file    stm32_assert.h
+  * @brief   STM32 assert file.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2018 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32_ASSERT_H
+#define __STM32_ASSERT_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/* Includes ------------------------------------------------------------------*/
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr: If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed.
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+ #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t* file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32_ASSERT_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/stm32l4xx_hal_conf.h

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+/**
+  ******************************************************************************
+  * @file    stm32l4xx_hal_conf.h
+  * @author  MCD Application Team
+  * @brief   HAL configuration template file.
+  *          This file should be copied to the application folder and renamed
+  *          to stm32l4xx_hal_conf.h.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef STM32L4xx_HAL_CONF_H
+#define STM32L4xx_HAL_CONF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## Module Selection ############################## */
+/**
+  * @brief This is the list of modules to be used in the HAL driver
+  */
+#define HAL_MODULE_ENABLED
+/*#define HAL_ADC_MODULE_ENABLED   */
+/*#define HAL_CRYP_MODULE_ENABLED   */
+/*#define HAL_CAN_MODULE_ENABLED   */
+/*#define HAL_COMP_MODULE_ENABLED   */
+/*#define HAL_CRC_MODULE_ENABLED   */
+/*#define HAL_CRYP_MODULE_ENABLED   */
+/*#define HAL_DAC_MODULE_ENABLED   */
+/*#define HAL_DCMI_MODULE_ENABLED   */
+/*#define HAL_DMA2D_MODULE_ENABLED   */
+/*#define HAL_DFSDM_MODULE_ENABLED   */
+/*#define HAL_DSI_MODULE_ENABLED   */
+/*#define HAL_FIREWALL_MODULE_ENABLED   */
+/*#define HAL_GFXMMU_MODULE_ENABLED   */
+/*#define HAL_HCD_MODULE_ENABLED   */
+/*#define HAL_HASH_MODULE_ENABLED   */
+/*#define HAL_I2S_MODULE_ENABLED   */
+/*#define HAL_IRDA_MODULE_ENABLED   */
+/*#define HAL_IWDG_MODULE_ENABLED   */
+/*#define HAL_LTDC_MODULE_ENABLED   */
+/*#define HAL_LCD_MODULE_ENABLED   */
+/*#define HAL_LPTIM_MODULE_ENABLED   */
+/*#define HAL_MMC_MODULE_ENABLED   */
+/*#define HAL_NAND_MODULE_ENABLED   */
+/*#define HAL_NOR_MODULE_ENABLED   */
+/*#define HAL_OPAMP_MODULE_ENABLED   */
+/*#define HAL_OSPI_MODULE_ENABLED   */
+/*#define HAL_OSPI_MODULE_ENABLED   */
+#define HAL_PCD_MODULE_ENABLED
+/*#define HAL_PKA_MODULE_ENABLED   */
+/*#define HAL_QSPI_MODULE_ENABLED   */
+/*#define HAL_QSPI_MODULE_ENABLED   */
+/*#define HAL_RNG_MODULE_ENABLED   */
+/*#define HAL_RTC_MODULE_ENABLED   */
+/*#define HAL_SAI_MODULE_ENABLED   */
+/*#define HAL_SD_MODULE_ENABLED   */
+/*#define HAL_SMBUS_MODULE_ENABLED   */
+/*#define HAL_SMARTCARD_MODULE_ENABLED   */
+/*#define HAL_SPI_MODULE_ENABLED   */
+/*#define HAL_SRAM_MODULE_ENABLED   */
+/*#define HAL_SWPMI_MODULE_ENABLED   */
+#define HAL_TIM_MODULE_ENABLED
+/*#define HAL_TSC_MODULE_ENABLED   */
+#define HAL_UART_MODULE_ENABLED
+/*#define HAL_USART_MODULE_ENABLED   */
+/*#define HAL_WWDG_MODULE_ENABLED   */
+/*#define HAL_EXTI_MODULE_ENABLED   */
+/*#define HAL_PSSI_MODULE_ENABLED   */
+#define HAL_GPIO_MODULE_ENABLED
+#define HAL_EXTI_MODULE_ENABLED
+#define HAL_I2C_MODULE_ENABLED
+#define HAL_DMA_MODULE_ENABLED
+#define HAL_RCC_MODULE_ENABLED
+#define HAL_FLASH_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
+#define HAL_CORTEX_MODULE_ENABLED
+
+/* ########################## Oscillator Values adaptation ####################*/
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PLL).
+  */
+#if !defined  (HSE_VALUE)
+  #define HSE_VALUE    ((uint32_t)8000000U) /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+  #define HSE_STARTUP_TIMEOUT    ((uint32_t)100U)   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief Internal Multiple Speed oscillator (MSI) default value.
+  *        This value is the default MSI range value after Reset.
+  */
+#if !defined  (MSI_VALUE)
+  #define MSI_VALUE    ((uint32_t)4000000U) /*!< Value of the Internal oscillator in Hz*/
+#endif /* MSI_VALUE */
+/**
+  * @brief Internal High Speed oscillator (HSI) value.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSI is used as system clock source, directly or through the PLL).
+  */
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @brief Internal High Speed oscillator (HSI48) value for USB FS, SDMMC and RNG.
+  *        This internal oscillator is mainly dedicated to provide a high precision clock to
+  *        the USB peripheral by means of a special Clock Recovery System (CRS) circuitry.
+  *        When the CRS is not used, the HSI48 RC oscillator runs on it default frequency
+  *        which is subject to manufacturing process variations.
+  */
+#if !defined  (HSI48_VALUE)
+ #define HSI48_VALUE   ((uint32_t)48000000U) /*!< Value of the Internal High Speed oscillator for USB FS/SDMMC/RNG in Hz.
+                                              The real value my vary depending on manufacturing process variations.*/
+#endif /* HSI48_VALUE */
+
+/**
+  * @brief Internal Low Speed oscillator (LSI) value.
+  */
+#if !defined  (LSI_VALUE)
+ #define LSI_VALUE  32000U       /*!< LSI Typical Value in Hz*/
+#endif /* LSI_VALUE */                      /*!< Value of the Internal Low Speed oscillator in Hz
+                                             The real value may vary depending on the variations
+                                             in voltage and temperature.*/
+
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  *        This value is used by the UART, RTC HAL module to compute the system frequency
+  */
+#if !defined  (LSE_VALUE)
+  #define LSE_VALUE    32768U /*!< Value of the External oscillator in Hz*/
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+  #define LSE_STARTUP_TIMEOUT    5000U   /*!< Time out for LSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External clock source for SAI1 peripheral
+  *        This value is used by the RCC HAL module to compute the SAI1 & SAI2 clock source
+  *        frequency.
+  */
+#if !defined  (EXTERNAL_SAI1_CLOCK_VALUE)
+  #define EXTERNAL_SAI1_CLOCK_VALUE    2097000U /*!< Value of the SAI1 External clock source in Hz*/
+#endif /* EXTERNAL_SAI1_CLOCK_VALUE */
+
+/**
+  * @brief External clock source for SAI2 peripheral
+  *        This value is used by the RCC HAL module to compute the SAI1 & SAI2 clock source
+  *        frequency.
+  */
+#if !defined  (EXTERNAL_SAI2_CLOCK_VALUE)
+  #define EXTERNAL_SAI2_CLOCK_VALUE    48000U /*!< Value of the SAI2 External clock source in Hz*/
+#endif /* EXTERNAL_SAI2_CLOCK_VALUE */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+/* ########################### System Configuration ######################### */
+/**
+  * @brief This is the HAL system configuration section
+  */
+
+#define  VDD_VALUE					  3300U /*!< Value of VDD in mv */
+#define  TICK_INT_PRIORITY            0U    /*!< tick interrupt priority */
+#define  USE_RTOS                     0U
+#define  PREFETCH_ENABLE              0U
+#define  INSTRUCTION_CACHE_ENABLE     1U
+#define  DATA_CACHE_ENABLE            1U
+
+/* ########################## Assert Selection ############################## */
+/**
+  * @brief Uncomment the line below to expanse the "assert_param" macro in the
+  *        HAL drivers code
+  */
+/* #define USE_FULL_ASSERT    1U */
+
+/* ################## Register callback feature configuration ############### */
+/**
+  * @brief Set below the peripheral configuration  to "1U" to add the support
+  *        of HAL callback registration/deregistration feature for the HAL
+  *        driver(s). This allows user application to provide specific callback
+  *        functions thanks to HAL_PPP_RegisterCallback() rather than overwriting
+  *        the default weak callback functions (see each stm32l4xx_hal_ppp.h file
+  *        for possible callback identifiers defined in HAL_PPP_CallbackIDTypeDef
+  *        for each PPP peripheral).
+  */
+#define USE_HAL_ADC_REGISTER_CALLBACKS        0U
+#define USE_HAL_CAN_REGISTER_CALLBACKS        0U
+#define USE_HAL_COMP_REGISTER_CALLBACKS       0U
+#define USE_HAL_CRYP_REGISTER_CALLBACKS       0U
+#define USE_HAL_DAC_REGISTER_CALLBACKS        0U
+#define USE_HAL_DCMI_REGISTER_CALLBACKS       0U
+#define USE_HAL_DFSDM_REGISTER_CALLBACKS      0U
+#define USE_HAL_DMA2D_REGISTER_CALLBACKS      0U
+#define USE_HAL_DSI_REGISTER_CALLBACKS        0U
+#define USE_HAL_GFXMMU_REGISTER_CALLBACKS     0U
+#define USE_HAL_HASH_REGISTER_CALLBACKS       0U
+#define USE_HAL_HCD_REGISTER_CALLBACKS        0U
+#define USE_HAL_I2C_REGISTER_CALLBACKS        0U
+#define USE_HAL_IRDA_REGISTER_CALLBACKS       0U
+#define USE_HAL_LPTIM_REGISTER_CALLBACKS      0U
+#define USE_HAL_LTDC_REGISTER_CALLBACKS       0U
+#define USE_HAL_MMC_REGISTER_CALLBACKS        0U
+#define USE_HAL_OPAMP_REGISTER_CALLBACKS      0U
+#define USE_HAL_OSPI_REGISTER_CALLBACKS       0U
+#define USE_HAL_PCD_REGISTER_CALLBACKS        0U
+#define USE_HAL_QSPI_REGISTER_CALLBACKS       0U
+#define USE_HAL_RNG_REGISTER_CALLBACKS        0U
+#define USE_HAL_RTC_REGISTER_CALLBACKS        0U
+#define USE_HAL_SAI_REGISTER_CALLBACKS        0U
+#define USE_HAL_SD_REGISTER_CALLBACKS         0U
+#define USE_HAL_SMARTCARD_REGISTER_CALLBACKS  0U
+#define USE_HAL_SMBUS_REGISTER_CALLBACKS      0U
+#define USE_HAL_SPI_REGISTER_CALLBACKS        0U
+#define USE_HAL_SWPMI_REGISTER_CALLBACKS      0U
+#define USE_HAL_TIM_REGISTER_CALLBACKS        0U
+#define USE_HAL_TSC_REGISTER_CALLBACKS        0U
+#define USE_HAL_UART_REGISTER_CALLBACKS       0U
+#define USE_HAL_USART_REGISTER_CALLBACKS      0U
+#define USE_HAL_WWDG_REGISTER_CALLBACKS       0U
+
+/* ################## SPI peripheral configuration ########################## */
+
+/* CRC FEATURE: Use to activate CRC feature inside HAL SPI Driver
+ * Activated: CRC code is present inside driver
+ * Deactivated: CRC code cleaned from driver
+ */
+
+#define USE_SPI_CRC                   0U
+
+/* Includes ------------------------------------------------------------------*/
+/**
+  * @brief Include module's header file
+  */
+
+#ifdef HAL_RCC_MODULE_ENABLED
+  #include "stm32l4xx_hal_rcc.h"
+#endif /* HAL_RCC_MODULE_ENABLED */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+  #include "stm32l4xx_hal_gpio.h"
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+#ifdef HAL_DMA_MODULE_ENABLED
+  #include "stm32l4xx_hal_dma.h"
+#endif /* HAL_DMA_MODULE_ENABLED */
+
+#ifdef HAL_DFSDM_MODULE_ENABLED
+  #include "stm32l4xx_hal_dfsdm.h"
+#endif /* HAL_DFSDM_MODULE_ENABLED */
+
+#ifdef HAL_CORTEX_MODULE_ENABLED
+  #include "stm32l4xx_hal_cortex.h"
+#endif /* HAL_CORTEX_MODULE_ENABLED */
+
+#ifdef HAL_ADC_MODULE_ENABLED
+  #include "stm32l4xx_hal_adc.h"
+#endif /* HAL_ADC_MODULE_ENABLED */
+
+#ifdef HAL_CAN_MODULE_ENABLED
+  #include "stm32l4xx_hal_can.h"
+#endif /* HAL_CAN_MODULE_ENABLED */
+
+#ifdef HAL_CAN_LEGACY_MODULE_ENABLED
+  #include "Legacy/stm32l4xx_hal_can_legacy.h"
+#endif /* HAL_CAN_LEGACY_MODULE_ENABLED */
+
+#ifdef HAL_COMP_MODULE_ENABLED
+  #include "stm32l4xx_hal_comp.h"
+#endif /* HAL_COMP_MODULE_ENABLED */
+
+#ifdef HAL_CRC_MODULE_ENABLED
+  #include "stm32l4xx_hal_crc.h"
+#endif /* HAL_CRC_MODULE_ENABLED */
+
+#ifdef HAL_CRYP_MODULE_ENABLED
+  #include "stm32l4xx_hal_cryp.h"
+#endif /* HAL_CRYP_MODULE_ENABLED */
+
+#ifdef HAL_DAC_MODULE_ENABLED
+  #include "stm32l4xx_hal_dac.h"
+#endif /* HAL_DAC_MODULE_ENABLED */
+
+#ifdef HAL_DCMI_MODULE_ENABLED
+  #include "stm32l4xx_hal_dcmi.h"
+#endif /* HAL_DCMI_MODULE_ENABLED */
+
+#ifdef HAL_DMA2D_MODULE_ENABLED
+  #include "stm32l4xx_hal_dma2d.h"
+#endif /* HAL_DMA2D_MODULE_ENABLED */
+
+#ifdef HAL_DSI_MODULE_ENABLED
+  #include "stm32l4xx_hal_dsi.h"
+#endif /* HAL_DSI_MODULE_ENABLED */
+
+#ifdef HAL_EXTI_MODULE_ENABLED
+  #include "stm32l4xx_hal_exti.h"
+#endif /* HAL_EXTI_MODULE_ENABLED */
+
+#ifdef HAL_GFXMMU_MODULE_ENABLED
+  #include "stm32l4xx_hal_gfxmmu.h"
+#endif /* HAL_GFXMMU_MODULE_ENABLED */
+
+#ifdef HAL_FIREWALL_MODULE_ENABLED
+  #include "stm32l4xx_hal_firewall.h"
+#endif /* HAL_FIREWALL_MODULE_ENABLED */
+
+#ifdef HAL_FLASH_MODULE_ENABLED
+  #include "stm32l4xx_hal_flash.h"
+#endif /* HAL_FLASH_MODULE_ENABLED */
+
+#ifdef HAL_HASH_MODULE_ENABLED
+  #include "stm32l4xx_hal_hash.h"
+#endif /* HAL_HASH_MODULE_ENABLED */
+
+#ifdef HAL_HCD_MODULE_ENABLED
+  #include "stm32l4xx_hal_hcd.h"
+#endif /* HAL_HCD_MODULE_ENABLED */
+
+#ifdef HAL_I2C_MODULE_ENABLED
+  #include "stm32l4xx_hal_i2c.h"
+#endif /* HAL_I2C_MODULE_ENABLED */
+
+#ifdef HAL_IRDA_MODULE_ENABLED
+  #include "stm32l4xx_hal_irda.h"
+#endif /* HAL_IRDA_MODULE_ENABLED */
+
+#ifdef HAL_IWDG_MODULE_ENABLED
+  #include "stm32l4xx_hal_iwdg.h"
+#endif /* HAL_IWDG_MODULE_ENABLED */
+
+#ifdef HAL_LCD_MODULE_ENABLED
+  #include "stm32l4xx_hal_lcd.h"
+#endif /* HAL_LCD_MODULE_ENABLED */
+
+#ifdef HAL_LPTIM_MODULE_ENABLED
+  #include "stm32l4xx_hal_lptim.h"
+#endif /* HAL_LPTIM_MODULE_ENABLED */
+
+#ifdef HAL_LTDC_MODULE_ENABLED
+  #include "stm32l4xx_hal_ltdc.h"
+#endif /* HAL_LTDC_MODULE_ENABLED */
+
+#ifdef HAL_MMC_MODULE_ENABLED
+  #include "stm32l4xx_hal_mmc.h"
+#endif /* HAL_MMC_MODULE_ENABLED */
+
+#ifdef HAL_NAND_MODULE_ENABLED
+  #include "stm32l4xx_hal_nand.h"
+#endif /* HAL_NAND_MODULE_ENABLED */
+
+#ifdef HAL_NOR_MODULE_ENABLED
+  #include "stm32l4xx_hal_nor.h"
+#endif /* HAL_NOR_MODULE_ENABLED */
+
+#ifdef HAL_OPAMP_MODULE_ENABLED
+  #include "stm32l4xx_hal_opamp.h"
+#endif /* HAL_OPAMP_MODULE_ENABLED */
+
+#ifdef HAL_OSPI_MODULE_ENABLED
+  #include "stm32l4xx_hal_ospi.h"
+#endif /* HAL_OSPI_MODULE_ENABLED */
+
+#ifdef HAL_PCD_MODULE_ENABLED
+  #include "stm32l4xx_hal_pcd.h"
+#endif /* HAL_PCD_MODULE_ENABLED */
+
+#ifdef HAL_PKA_MODULE_ENABLED
+  #include "stm32l4xx_hal_pka.h"
+#endif /* HAL_PKA_MODULE_ENABLED */
+
+#ifdef HAL_PSSI_MODULE_ENABLED
+  #include "stm32l4xx_hal_pssi.h"
+#endif /* HAL_PSSI_MODULE_ENABLED */
+
+#ifdef HAL_PWR_MODULE_ENABLED
+  #include "stm32l4xx_hal_pwr.h"
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#ifdef HAL_QSPI_MODULE_ENABLED
+  #include "stm32l4xx_hal_qspi.h"
+#endif /* HAL_QSPI_MODULE_ENABLED */
+
+#ifdef HAL_RNG_MODULE_ENABLED
+  #include "stm32l4xx_hal_rng.h"
+#endif /* HAL_RNG_MODULE_ENABLED */
+
+#ifdef HAL_RTC_MODULE_ENABLED
+  #include "stm32l4xx_hal_rtc.h"
+#endif /* HAL_RTC_MODULE_ENABLED */
+
+#ifdef HAL_SAI_MODULE_ENABLED
+  #include "stm32l4xx_hal_sai.h"
+#endif /* HAL_SAI_MODULE_ENABLED */
+
+#ifdef HAL_SD_MODULE_ENABLED
+  #include "stm32l4xx_hal_sd.h"
+#endif /* HAL_SD_MODULE_ENABLED */
+
+#ifdef HAL_SMARTCARD_MODULE_ENABLED
+  #include "stm32l4xx_hal_smartcard.h"
+#endif /* HAL_SMARTCARD_MODULE_ENABLED */
+
+#ifdef HAL_SMBUS_MODULE_ENABLED
+  #include "stm32l4xx_hal_smbus.h"
+#endif /* HAL_SMBUS_MODULE_ENABLED */
+
+#ifdef HAL_SPI_MODULE_ENABLED
+  #include "stm32l4xx_hal_spi.h"
+#endif /* HAL_SPI_MODULE_ENABLED */
+
+#ifdef HAL_SRAM_MODULE_ENABLED
+  #include "stm32l4xx_hal_sram.h"
+#endif /* HAL_SRAM_MODULE_ENABLED */
+
+#ifdef HAL_SWPMI_MODULE_ENABLED
+  #include "stm32l4xx_hal_swpmi.h"
+#endif /* HAL_SWPMI_MODULE_ENABLED */
+
+#ifdef HAL_TIM_MODULE_ENABLED
+  #include "stm32l4xx_hal_tim.h"
+#endif /* HAL_TIM_MODULE_ENABLED */
+
+#ifdef HAL_TSC_MODULE_ENABLED
+  #include "stm32l4xx_hal_tsc.h"
+#endif /* HAL_TSC_MODULE_ENABLED */
+
+#ifdef HAL_UART_MODULE_ENABLED
+  #include "stm32l4xx_hal_uart.h"
+#endif /* HAL_UART_MODULE_ENABLED */
+
+#ifdef HAL_USART_MODULE_ENABLED
+  #include "stm32l4xx_hal_usart.h"
+#endif /* HAL_USART_MODULE_ENABLED */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+  #include "stm32l4xx_hal_wwdg.h"
+#endif /* HAL_WWDG_MODULE_ENABLED */
+
+/* Exported macro ------------------------------------------------------------*/
+#ifdef  USE_FULL_ASSERT
+/**
+  * @brief  The assert_param macro is used for function's parameters check.
+  * @param  expr If expr is false, it calls assert_failed function
+  *         which reports the name of the source file and the source
+  *         line number of the call that failed.
+  *         If expr is true, it returns no value.
+  * @retval None
+  */
+  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+/* Exported functions ------------------------------------------------------- */
+  void assert_failed(uint8_t *file, uint32_t line);
+#else
+  #define assert_param(expr) ((void)0U)
+#endif /* USE_FULL_ASSERT */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* STM32L4xx_HAL_CONF_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/stm32l4xx_it.h

@@ -0,0 +1,72 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    stm32l4xx_it.h
+  * @brief   This file contains the headers of the interrupt handlers.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+ ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32L4xx_IT_H
+#define __STM32L4xx_IT_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Private includes ----------------------------------------------------------*/
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* Exported types ------------------------------------------------------------*/
+/* USER CODE BEGIN ET */
+
+/* USER CODE END ET */
+
+/* Exported constants --------------------------------------------------------*/
+/* USER CODE BEGIN EC */
+
+/* USER CODE END EC */
+
+/* Exported macro ------------------------------------------------------------*/
+/* USER CODE BEGIN EM */
+
+/* USER CODE END EM */
+
+/* Exported functions prototypes ---------------------------------------------*/
+void NMI_Handler(void);
+void HardFault_Handler(void);
+void MemManage_Handler(void);
+void BusFault_Handler(void);
+void UsageFault_Handler(void);
+void SVC_Handler(void);
+void DebugMon_Handler(void);
+void PendSV_Handler(void);
+void SysTick_Handler(void);
+void EXTI0_IRQHandler(void);
+void TIM6_DAC_IRQHandler(void);
+void USB_IRQHandler(void);
+/* USER CODE BEGIN EFP */
+
+/* USER CODE END EFP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32L4xx_IT_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/tim.h

@@ -0,0 +1,58 @@
+/**
+  ******************************************************************************
+  * File Name          : TIM.h
+  * Description        : This file provides code for the configuration
+  *                      of the TIM instances.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __tim_H
+#define __tim_H
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+extern TIM_HandleTypeDef htim6;
+
+/* USER CODE BEGIN Private defines */
+
+/* USER CODE END Private defines */
+
+void MX_TIM6_Init(void);
+
+/* USER CODE BEGIN Prototypes */
+
+/* USER CODE END Prototypes */
+
+#ifdef __cplusplus
+}
+#endif
+#endif /*__ tim_H */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/usb_device.h

@@ -0,0 +1,105 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : usb_device.h
+  * @version        : v2.0_Cube
+  * @brief          : Header for usb_device.c file.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USB_DEVICE__H__
+#define __USB_DEVICE__H__
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32l4xx.h"
+#include "stm32l4xx_hal.h"
+#include "usbd_def.h"
+
+/* USER CODE BEGIN INCLUDE */
+
+/* USER CODE END INCLUDE */
+
+/** @addtogroup USBD_OTG_DRIVER
+  * @{
+  */
+
+/** @defgroup USBD_DEVICE USBD_DEVICE
+  * @brief Device file for Usb otg low level driver.
+  * @{
+  */
+
+/** @defgroup USBD_DEVICE_Exported_Variables USBD_DEVICE_Exported_Variables
+  * @brief Public variables.
+  * @{
+  */
+
+/* Private variables ---------------------------------------------------------*/
+/* USER CODE BEGIN PV */
+
+/* USER CODE END PV */
+
+/* Private function prototypes -----------------------------------------------*/
+/* USER CODE BEGIN PFP */
+
+/* USER CODE END PFP */
+
+/*
+ * -- Insert your variables declaration here --
+ */
+/* USER CODE BEGIN VARIABLES */
+
+/* USER CODE END VARIABLES */
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DEVICE_Exported_FunctionsPrototype USBD_DEVICE_Exported_FunctionsPrototype
+  * @brief Declaration of public functions for Usb device.
+  * @{
+  */
+
+/** USB Device initialization function. */
+void MX_USB_DEVICE_Init(void);
+
+/*
+ * -- Insert functions declaration here --
+ */
+/* USER CODE BEGIN FD */
+
+/* USER CODE END FD */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __USB_DEVICE__H__ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/usbd_cdc_if.h

@@ -0,0 +1,134 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : usbd_cdc_if.h
+  * @version        : v2.0_Cube
+  * @brief          : Header for usbd_cdc_if.c file.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USBD_CDC_IF_H__
+#define __USBD_CDC_IF_H__
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "usbd_cdc.h"
+
+/* USER CODE BEGIN INCLUDE */
+
+/* USER CODE END INCLUDE */
+
+/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
+  * @brief For Usb device.
+  * @{
+  */
+
+/** @defgroup USBD_CDC_IF USBD_CDC_IF
+  * @brief Usb VCP device module
+  * @{
+  */
+
+/** @defgroup USBD_CDC_IF_Exported_Defines USBD_CDC_IF_Exported_Defines
+  * @brief Defines.
+  * @{
+  */
+/* USER CODE BEGIN EXPORTED_DEFINES */
+/* Define size for the receive and transmit buffer over CDC */
+/* It's up to user to redefine and/or remove those define */
+#define APP_RX_DATA_SIZE  1000
+#define APP_TX_DATA_SIZE  1000
+
+/* USER CODE END EXPORTED_DEFINES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Exported_Types USBD_CDC_IF_Exported_Types
+  * @brief Types.
+  * @{
+  */
+
+/* USER CODE BEGIN EXPORTED_TYPES */
+
+/* USER CODE END EXPORTED_TYPES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Exported_Macros USBD_CDC_IF_Exported_Macros
+  * @brief Aliases.
+  * @{
+  */
+
+/* USER CODE BEGIN EXPORTED_MACRO */
+
+/* USER CODE END EXPORTED_MACRO */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
+  * @brief Public variables.
+  * @{
+  */
+
+/** CDC Interface callback. */
+extern USBD_CDC_ItfTypeDef USBD_Interface_fops_FS;
+
+/* USER CODE BEGIN EXPORTED_VARIABLES */
+
+/* USER CODE END EXPORTED_VARIABLES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Exported_FunctionsPrototype USBD_CDC_IF_Exported_FunctionsPrototype
+  * @brief Public functions declaration.
+  * @{
+  */
+
+uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len);
+
+/* USER CODE BEGIN EXPORTED_FUNCTIONS */
+
+/* USER CODE END EXPORTED_FUNCTIONS */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __USBD_CDC_IF_H__ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/usbd_conf.h

@@ -0,0 +1,173 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : usbd_conf.h
+  * @version        : v2.0_Cube
+  * @brief          : Header for usbd_conf.c file.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USBD_CONF__H__
+#define __USBD_CONF__H__
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "main.h"
+#include "stm32l4xx.h"
+#include "stm32l4xx_hal.h"
+
+/* USER CODE BEGIN INCLUDE */
+
+/* USER CODE END INCLUDE */
+
+/** @addtogroup USBD_OTG_DRIVER
+  * @brief Driver for Usb device.
+  * @{
+  */
+
+/** @defgroup USBD_CONF USBD_CONF
+  * @brief Configuration file for Usb otg low level driver.
+  * @{
+  */
+
+/** @defgroup USBD_CONF_Exported_Variables USBD_CONF_Exported_Variables
+  * @brief Public variables.
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CONF_Exported_Defines USBD_CONF_Exported_Defines
+  * @brief Defines for configuration of the Usb device.
+  * @{
+  */
+
+/*---------- -----------*/
+#define USBD_MAX_NUM_INTERFACES     1U
+/*---------- -----------*/
+#define USBD_MAX_NUM_CONFIGURATION     1U
+/*---------- -----------*/
+#define USBD_MAX_STR_DESC_SIZ     512U
+/*---------- -----------*/
+#define USBD_DEBUG_LEVEL     0U
+/*---------- -----------*/
+#define USBD_LPM_ENABLED     1U
+/*---------- -----------*/
+#define USBD_SELF_POWERED     1U
+
+/****************************************/
+/* #define for FS and HS identification */
+#define DEVICE_FS 		0
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CONF_Exported_Macros USBD_CONF_Exported_Macros
+  * @brief Aliases.
+  * @{
+  */
+
+/* Memory management macros */
+
+/** Alias for memory allocation. */
+#define USBD_malloc         malloc
+
+/** Alias for memory release. */
+#define USBD_free          free
+
+/** Alias for memory set. */
+#define USBD_memset         memset
+
+/** Alias for memory copy. */
+#define USBD_memcpy         memcpy
+
+/** Alias for delay. */
+#define USBD_Delay          HAL_Delay
+
+/* DEBUG macros */
+
+#if (USBD_DEBUG_LEVEL > 0)
+#define USBD_UsrLog(...)    printf(__VA_ARGS__);\
+                            printf("\n");
+#else
+#define USBD_UsrLog(...)
+#endif
+
+#if (USBD_DEBUG_LEVEL > 1)
+
+#define USBD_ErrLog(...)    printf("ERROR: ") ;\
+                            printf(__VA_ARGS__);\
+                            printf("\n");
+#else
+#define USBD_ErrLog(...)
+#endif
+
+#if (USBD_DEBUG_LEVEL > 2)
+#define USBD_DbgLog(...)    printf("DEBUG : ") ;\
+                            printf(__VA_ARGS__);\
+                            printf("\n");
+#else
+#define USBD_DbgLog(...)
+#endif
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CONF_Exported_Types USBD_CONF_Exported_Types
+  * @brief Types.
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CONF_Exported_FunctionsPrototype USBD_CONF_Exported_FunctionsPrototype
+  * @brief Declaration of public functions for Usb device.
+  * @{
+  */
+
+/* Exported functions -------------------------------------------------------*/
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __USBD_CONF__H__ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/cubemx/usbd_desc.h

@@ -0,0 +1,145 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : usbd_desc.c
+  * @version        : v2.0_Cube
+  * @brief          : Header for usbd_conf.c file.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USBD_DESC__C__
+#define __USBD_DESC__C__
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "usbd_def.h"
+
+/* USER CODE BEGIN INCLUDE */
+
+/* USER CODE END INCLUDE */
+
+/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
+  * @{
+  */
+
+/** @defgroup USBD_DESC USBD_DESC
+  * @brief Usb device descriptors module.
+  * @{
+  */
+
+/** @defgroup USBD_DESC_Exported_Constants USBD_DESC_Exported_Constants
+  * @brief Constants.
+  * @{
+  */
+#define         DEVICE_ID1          (UID_BASE)
+#define         DEVICE_ID2          (UID_BASE + 0x4)
+#define         DEVICE_ID3          (UID_BASE + 0x8)
+
+#define  USB_SIZ_STRING_SERIAL       0x1A
+
+/* USER CODE BEGIN EXPORTED_CONSTANTS */
+
+/* USER CODE END EXPORTED_CONSTANTS */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Exported_Defines USBD_DESC_Exported_Defines
+  * @brief Defines.
+  * @{
+  */
+
+/* USER CODE BEGIN EXPORTED_DEFINES */
+
+/* USER CODE END EXPORTED_DEFINES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Exported_TypesDefinitions USBD_DESC_Exported_TypesDefinitions
+  * @brief Types.
+  * @{
+  */
+
+/* USER CODE BEGIN EXPORTED_TYPES */
+
+/* USER CODE END EXPORTED_TYPES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Exported_Macros USBD_DESC_Exported_Macros
+  * @brief Aliases.
+  * @{
+  */
+
+/* USER CODE BEGIN EXPORTED_MACRO */
+
+/* USER CODE END EXPORTED_MACRO */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Exported_Variables USBD_DESC_Exported_Variables
+  * @brief Public variables.
+  * @{
+  */
+
+/** Descriptor for the Usb device. */
+extern USBD_DescriptorsTypeDef FS_Desc;
+
+/* USER CODE BEGIN EXPORTED_VARIABLES */
+
+/* USER CODE END EXPORTED_VARIABLES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Exported_FunctionsPrototype USBD_DESC_Exported_FunctionsPrototype
+  * @brief Public functions declaration.
+  * @{
+  */
+
+/* USER CODE BEGIN EXPORTED_FUNCTIONS */
+
+/* USER CODE END EXPORTED_FUNCTIONS */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __USBD_DESC__C__ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/include/debug.h

@@ -0,0 +1,29 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+class Debug
+{
+public:
+    static bool init();
+
+    static void banner();
+
+    static void setMarker(int marker);
+    static void resetMarker(int marker);
+
+    static void trap(int number);
+    static void trap(int number, const char *format, ...);
+};

interface2/firmware/include/ice40.h

@@ -0,0 +1,34 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+#include <cstdint>
+#include <cstddef>
+
+class ICE40
+{
+public:
+    ICE40();
+
+    bool configure(const uint8_t *bitstream, size_t bitstreamCount);
+
+    inline bool isConfigured()
+    {
+        return _isConfigured;
+    }
+
+private:
+    bool _isConfigured;
+};

interface2/firmware/include/indicators.h

@@ -0,0 +1,43 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+enum IndicatorsStatus {
+    INDICATORS_STATUS_UNKNOWN,
+    INDICATORS_STATUS_CONFIGURING,
+    INDICATORS_STATUS_RUNNING
+};
+
+class Indicators
+{
+public:
+    Indicators();
+
+    void init();
+
+    void setStatus(IndicatorsStatus status);
+
+    void tx();
+    void rx();
+    void error();
+
+    void update();
+
+private:
+    volatile IndicatorsStatus _status;
+    volatile uint8_t _txState;
+    volatile uint8_t _rxState;
+    volatile uint8_t _errorState;
+};

interface2/firmware/include/interface.h

@@ -0,0 +1,60 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+#include <cstdint>
+#include <cstddef>
+
+#include "coax.h"
+#include "indicators.h"
+
+#define COMMAND_RESET 0x01
+#define COMMAND_TRANSMIT_RECEIVE 0x06
+#define COMMAND_INFO 0xf0
+#define COMMAND_TEST 0xf1
+#define COMMAND_DFU 0xf2
+
+#define INFO_SUPPORTED_QUERIES 0x01
+#define INFO_HARDWARE_TYPE 0x02
+#define INFO_HARDWARE_REVISION 0x03
+#define INFO_HARDWARE_SERIAL 0x04
+#define INFO_FIRMWARE_VERSION 0x05
+#define INFO_MESSAGE_BUFFER_SIZE 0x06
+#define INFO_FEATURES 0x07
+
+#define TEST_SUPPORTED_TESTS 0x01
+
+#define ERROR_INVALID_MESSAGE 1
+#define ERROR_UNKNOWN_COMMAND 2
+#define ERROR_MESSAGE_TIMEOUT 3
+
+class Interface
+{
+public:
+    Interface(Coax &coax, Indicators &indicators);
+
+    void handleMessage(uint8_t *buffer, size_t bufferCount);
+    void handleError(MessageReceiverError error);
+
+private:
+    Coax &_coax;
+    Indicators &_indicators;
+
+    void handleReset(uint8_t *buffer, size_t bufferCount);
+    void handleTransmitReceive(uint8_t *buffer, size_t bufferCount);
+    void handleInfo(uint8_t *buffer, size_t bufferCount);
+    void handleTest(uint8_t *buffer, size_t bufferCount);
+    void handleDFU(uint8_t *buffer, size_t bufferCount);
+};

interface2/firmware/include/message.h

@@ -0,0 +1,60 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+#include <cstdint>
+#include <cstddef>
+
+enum MessageReceiverError {
+    MESSAGE_RECEIVER_ERROR_DATA_OVERFLOW,
+    MESSAGE_RECEIVER_ERROR_MESSAGE_OVERFLOW,
+    MESSAGE_RECEIVER_ERROR_TIMEOUT
+};
+
+enum MessageReceiverState {
+    MESSAGE_RECEIVER_STATE_WAIT_START,
+    MESSAGE_RECEIVER_STATE_DATA,
+    MESSAGE_RECEIVER_STATE_ESCAPE,
+    MESSAGE_RECEIVER_STATE_AVAILABLE,
+    MESSAGE_RECEIVER_STATE_DATA_OVERFLOW,
+    MESSAGE_RECEIVER_STATE_MESSAGE_OVERFLOW
+};
+
+class MessageReceiver
+{
+public:
+    MessageReceiver(volatile uint8_t *buffer, size_t bufferSize,
+            void (*messageCallback)(const uint8_t *, size_t),
+            void (*errorCallback)(MessageReceiverError));
+
+    void load(const uint8_t *buffer, size_t bufferCount);
+    bool dispatch();
+
+private:
+    uint32_t _timeout;
+    volatile uint32_t _lastReceiveTime;
+    volatile uint8_t *_buffer;
+    size_t _bufferSize;
+    volatile size_t _bufferCount;
+    volatile MessageReceiverState _state;
+    void (*_messageCallback)(const uint8_t *, size_t);
+    void (*_errorCallback)(MessageReceiverError);
+};
+
+class MessageSender
+{
+public:
+    static bool send(const uint8_t *buffer, size_t bufferCount);
+};

interface2/firmware/include/pins.h

@@ -0,0 +1,55 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+#include "stm32l4xx_ll_gpio.h"
+
+#define COAX_RESET_Pin GPIO_PIN_3
+#define COAX_RESET_GPIO_Port GPIOA
+#define COAX_IRQ_Pin GPIO_PIN_0
+#define COAX_IRQ_GPIO_Port GPIOB
+#define COAX_IRQ_EXTI_IRQn EXTI0_IRQn
+
+#define ICE40_CS_Pin GPIO_PIN_4
+#define ICE40_CS_GPIO_Port GPIOA
+#define ICE40_SCK_Pin GPIO_PIN_5
+#define ICE40_SCK_GPIO_Port GPIOA
+#define ICE40_SDO_Pin GPIO_PIN_6
+#define ICE40_SDO_GPIO_Port GPIOA
+#define ICE40_SDI_Pin GPIO_PIN_7
+#define ICE40_SDI_GPIO_Port GPIOA
+#define ICE40_CRESET_Pin GPIO_PIN_1
+#define ICE40_CRESET_GPIO_Port GPIOB
+#define ICE40_CDONE_Pin GPIO_PIN_2
+#define ICE40_CDONE_GPIO_Port GPIOB
+
+#define GPIO0_Pin GPIO_PIN_10
+#define GPIO0_GPIO_Port GPIOB
+#define GPIO1_Pin GPIO_PIN_11
+#define GPIO1_GPIO_Port GPIOB
+
+#define LED_STATUS_Pin GPIO_PIN_12
+#define LED_STATUS_GPIO_Port GPIOB
+#define LED_TX_Pin GPIO_PIN_13
+#define LED_TX_GPIO_Port GPIOB
+#define LED_RX_Pin GPIO_PIN_14
+#define LED_RX_GPIO_Port GPIOB
+#define LED_ERROR_Pin GPIO_PIN_15
+#define LED_ERROR_GPIO_Port GPIOB
+
+#define USB_D__Pin GPIO_PIN_11
+#define USB_D__GPIO_Port GPIOA
+#define USB_D_A12_Pin GPIO_PIN_12
+#define USB_D_A12_GPIO_Port GPIOA

interface2/firmware/include/version.h

@@ -0,0 +1,19 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#pragma once
+
+#define VERSION_MAJOR 0
+#define VERSION_MINOR 0
+#define VERSION_PATCH 1

interface2/firmware/platformio.ini

@@ -0,0 +1,13 @@
+[env:default]
+platform = ststm32
+framework = stm32cube
+board = stm32l443cc
+upload_protocol = dfu
+build_flags =
+    !./generate_bitstream_inc.sh
+    -Iinclude/cubemx
+    -DUSE_FULL_LL_DRIVER
+src_build_flags =
+    !echo "-DFIRMWARE_BUILD_WHAT='\""$(git describe --match ForceNone --abbrev=7 --always --dirty=+)"\"'"
+    !echo "-DFIRMWARE_BUILD_WHO='\""$(whoami)"\"'"
+    !echo "-DFIRMWARE_BUILD_WHEN='\""$(date)"\"'"

interface2/firmware/src/coax.cpp

@@ -0,0 +1,469 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include <cstring>
+
+#include "stm32l4xx_ll_spi.h"
+
+#include "pins.h"
+#include "debug.h"
+
+#include "coax.h"
+
+Coax::Coax(SPICoaxTransceiver &spiCoaxTransceiver, CoaxParity parity,
+        volatile uint16_t *buffer, size_t bufferSize) :
+    _spiCoaxTransceiver(spiCoaxTransceiver),
+    _parity(parity),
+    _buffer(buffer),
+    _bufferSize(bufferSize)
+{
+    _isInitialized = false;
+}
+
+bool Coax::init()
+{
+    _isInitialized = false;
+
+    _interruptState = COAX_INTERRUPT_STATE_DISABLED;
+
+    if (!_spiCoaxTransceiver.init()) {
+        return false;
+    }
+
+    _spiCoaxTransceiver.setTXParity(_parity);
+    _spiCoaxTransceiver.setRXParity(_parity);
+
+    _isInitialized = true;
+
+    return _isInitialized;
+}
+
+void Coax::reset()
+{
+    if (!_isInitialized) {
+        return;
+    }
+
+    _interruptState = COAX_INTERRUPT_STATE_DISABLED;
+
+    _spiCoaxTransceiver.reset();
+
+    _spiCoaxTransceiver.setTXParity(_parity);
+    _spiCoaxTransceiver.setRXParity(_parity);
+}
+
+int Coax::transmit(const uint16_t *buffer, size_t bufferCount)
+{
+    if (!_isInitialized) {
+        return COAX_ERROR_NOT_INITIALIZED;
+    }
+
+    uint8_t status = _spiCoaxTransceiver.readRegister(COAX_REGISTER_STATUS);
+
+    if (status & COAX_REGISTER_STATUS_RX_ACTIVE) {
+        return COAX_ERROR_TX_RECEIVER_ACTIVE;
+    }
+
+    if (status & COAX_REGISTER_STATUS_RX_ERROR) {
+        Debug::trap(101);
+
+        _spiCoaxTransceiver.reset();
+    }
+
+    _interruptState = COAX_INTERRUPT_STATE_IDLE;
+
+    return _spiCoaxTransceiver.transmit(buffer, bufferCount);
+}
+
+int Coax::receive(uint16_t *buffer, size_t bufferSize, uint16_t timeout)
+{
+    if (!_isInitialized) {
+        return COAX_ERROR_NOT_INITIALIZED;
+    }
+
+    if (timeout > 0) {
+        uint32_t startTime = HAL_GetTick();
+
+        while (_interruptState == COAX_INTERRUPT_STATE_IDLE) {
+            // https://www.forward.com.au/pfod/ArduinoProgramming/TimingDelaysInArduino.html#unsigned
+            if ((HAL_GetTick() - startTime) > timeout) {
+                return 0;
+            }
+        }
+    }
+
+uint32_t startTime = HAL_GetTick();
+
+    while (!(_interruptState == COAX_INTERRUPT_STATE_RECEIVED || _interruptState == COAX_INTERRUPT_STATE_ERROR)) {
+if ((HAL_GetTick() - startTime) > 1000) {
+    Debug::trap(102);
+}
+    }
+
+    int count = 0;
+
+    if (_interruptState == COAX_INTERRUPT_STATE_RECEIVED) {
+        count = _bufferCount > bufferSize ? bufferSize : _bufferCount;
+
+        memcpy(buffer, const_cast<uint16_t *>(_buffer), count * sizeof(uint16_t));
+
+        // TODO: we should be able to manipulate _buffer and not change the state
+        // to allow multiple calls to this method to read a large message... but
+        // that is not necessary right now
+    } else if (_interruptState == COAX_INTERRUPT_STATE_ERROR) {
+        Debug::trap(103, "error = %d", _error);
+
+        count = (-1) * _error;
+    }
+
+    _interruptState = COAX_INTERRUPT_STATE_IDLE;
+
+    return count;
+}
+
+void Coax::handleInterrupt()
+{
+    if (!_isInitialized) {
+        Debug::trap(104);
+        return;
+    }
+
+    if (_interruptState != COAX_INTERRUPT_STATE_IDLE) {
+        Debug::trap(105, "state = %d", _interruptState);
+        return;
+    }
+
+    _interruptState = COAX_INTERRUPT_STATE_RECEIVING;
+
+    int error = 0;
+
+    uint16_t *buffer = const_cast<uint16_t *>(_buffer);
+    size_t bufferSize = _bufferSize;
+    int bufferCount = 0;
+
+    bool isActive;
+    int count;
+
+    do {
+        // Determine if the receiver is active before reading from the FIFO to
+        // avoid a race condition where the FIFO is empty, the receiver is
+        // active but is inactive by the time we check the status.
+        isActive = _spiCoaxTransceiver.isRXActive();
+
+        // TODO: need to somehow handle an overflow detection here...
+
+        count = _spiCoaxTransceiver.receive(buffer, bufferSize);
+
+        if (count < 0) {
+            error = (-1) * count;
+            break;
+        }
+
+        bufferCount += count;
+
+        buffer += count;
+        bufferSize -= count;
+    } while (isActive || count == static_cast<int>(bufferSize));
+
+    if (error != 0) {
+        _bufferCount = 0;
+        _error = error;
+
+        _interruptState = COAX_INTERRUPT_STATE_ERROR;
+    } else {
+        _bufferCount = bufferCount;
+        _error = 0;
+
+        _interruptState = COAX_INTERRUPT_STATE_RECEIVED;
+    }
+}
+
+#define COAX_COMMAND_READ_REGISTER 0x2
+#define COAX_COMMAND_WRITE_REGISTER 0x3
+#define COAX_COMMAND_TX 0x4
+#define COAX_COMMAND_RX 0x5
+#define COAX_COMMAND_RESET 0xff
+
+#define NOP asm volatile("nop\n\t")
+#define ATOMIC_BLOCK_START __disable_irq()
+#define ATOMIC_BLOCK_END __enable_irq()
+
+SPICoaxTransceiver::SPICoaxTransceiver()
+{
+}
+
+bool SPICoaxTransceiver::init()
+{
+    // Configure GPIO.
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+
+    HAL_GPIO_WritePin(GPIOA, ICE40_CS_Pin | COAX_RESET_Pin, GPIO_PIN_RESET);
+
+    GPIO_InitTypeDef gpioInit = { 0 };
+
+    gpioInit.Pin = ICE40_CS_Pin | COAX_RESET_Pin;
+    gpioInit.Mode = GPIO_MODE_OUTPUT_PP;
+    gpioInit.Pull = GPIO_NOPULL;
+    gpioInit.Speed = GPIO_SPEED_FREQ_LOW;
+
+    HAL_GPIO_Init(GPIOA, &gpioInit);
+
+    gpioInit.Pin = COAX_IRQ_Pin;
+    gpioInit.Mode = GPIO_MODE_IT_RISING;
+    gpioInit.Pull = GPIO_NOPULL;
+
+    HAL_GPIO_Init(GPIOB, &gpioInit);
+
+    HAL_NVIC_SetPriority(EXTI0_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(EXTI0_IRQn);
+
+    // Set initial GPIO state.
+    HAL_GPIO_WritePin(GPIOA, ICE40_CS_Pin, GPIO_PIN_SET);
+    HAL_GPIO_WritePin(GPIOA, COAX_RESET_Pin, GPIO_PIN_RESET);
+
+    // Configure SPI.
+    __HAL_RCC_SPI1_CLK_ENABLE();
+
+    gpioInit.Pin = ICE40_SCK_Pin | ICE40_SDI_Pin | ICE40_SDO_Pin;
+    gpioInit.Mode = GPIO_MODE_AF_PP;
+    gpioInit.Alternate = GPIO_AF5_SPI1;
+    gpioInit.Pull = GPIO_NOPULL;
+    gpioInit.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+
+    HAL_GPIO_Init(GPIOA, &gpioInit);
+
+    LL_SPI_InitTypeDef spiInit = { 0 };
+
+    spiInit.TransferDirection = LL_SPI_FULL_DUPLEX;
+    spiInit.Mode = LL_SPI_MODE_MASTER;
+    spiInit.DataWidth = LL_SPI_DATAWIDTH_8BIT;
+    spiInit.ClockPolarity = LL_SPI_POLARITY_LOW;
+    spiInit.ClockPhase = LL_SPI_PHASE_1EDGE;
+    spiInit.NSS = LL_SPI_NSS_SOFT;
+    spiInit.BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV8;
+    spiInit.BitOrder = LL_SPI_MSB_FIRST;
+    spiInit.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
+    spiInit.CRCPoly = 7;
+
+    LL_SPI_Init(SPI1, &spiInit);
+
+    LL_SPI_SetStandard(SPI1, LL_SPI_PROTOCOL_MOTOROLA);
+    LL_SPI_DisableNSSPulseMgt(SPI1);
+    LL_SPI_SetRxFIFOThreshold(SPI1, LL_SPI_RX_FIFO_TH_QUARTER);
+
+    LL_SPI_Enable(SPI1);
+
+    // Release hardware reset.
+    HAL_GPIO_WritePin(GPIOA, COAX_RESET_Pin, GPIO_PIN_SET);
+
+    uint8_t deviceId = readRegister(COAX_REGISTER_DEVICE_ID);
+
+    if (deviceId != 0xa5) {
+        return false;
+    }
+
+    reset();
+
+    setLoopback(false);
+
+    setTXParity(CoaxParity::Even);
+    setRXParity(CoaxParity::Even);
+
+    return true;
+}
+
+void SPICoaxTransceiver::reset()
+{
+    uint8_t transmitBuffer[1] = { COAX_COMMAND_RESET };
+
+    ATOMIC_BLOCK_START;
+    LL_GPIO_ResetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+
+    spiTransfer(transmitBuffer, NULL, 1);
+
+    LL_GPIO_SetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+    ATOMIC_BLOCK_END;
+}
+
+uint8_t SPICoaxTransceiver::readRegister(uint8_t index)
+{
+    uint8_t transmitBuffer[2] = { (uint8_t) (COAX_COMMAND_READ_REGISTER | (index << 4)), 0x00 };
+    uint8_t receiveBuffer[2];
+
+    ATOMIC_BLOCK_START;
+    LL_GPIO_ResetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+
+    spiTransfer(transmitBuffer, receiveBuffer, 2);
+
+    LL_GPIO_SetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+    ATOMIC_BLOCK_END;
+
+    return receiveBuffer[1];
+}
+
+void SPICoaxTransceiver::writeRegister(uint8_t index, uint8_t value, uint8_t mask)
+{
+    uint8_t transmitBuffer[3] = { (uint8_t) (COAX_COMMAND_WRITE_REGISTER | (index << 4)), mask, value };
+
+    ATOMIC_BLOCK_START;
+    LL_GPIO_ResetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+
+    spiTransfer(transmitBuffer, NULL, 3);
+
+    LL_GPIO_SetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+    ATOMIC_BLOCK_END;
+}
+
+int SPICoaxTransceiver::transmit(const uint16_t *buffer, size_t bufferCount)
+{
+    uint8_t transmitBuffer[2] = { COAX_COMMAND_TX };
+    uint8_t receiveBuffer[2];
+
+    size_t count = 0;
+    int error = 0;
+
+    ATOMIC_BLOCK_START;
+    LL_GPIO_ResetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+
+    spiTransfer(transmitBuffer, NULL, 1);
+
+    do {
+        transmitBuffer[0] = (buffer[count] >> 8) & 0x03;
+        transmitBuffer[1] = buffer[count] & 0xff;
+
+        spiTransfer(transmitBuffer, receiveBuffer, 2);
+
+        uint8_t value = receiveBuffer[1];
+
+        if (value == 0) {
+            count++;
+        } else if (value == 0x81) {
+            // Overflow... we'll just try again.
+            continue;
+        } else if (value == 0x82) {
+            error = COAX_ERROR_TX_UNDERFLOW;
+            break;
+        }
+    } while (count < bufferCount);
+
+    LL_GPIO_SetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+    ATOMIC_BLOCK_END;
+
+    if (error != 0) {
+        return error;
+    }
+
+    while (!isTXComplete()) {
+        NOP;
+    }
+
+    return count;
+}
+
+int SPICoaxTransceiver::receive(uint16_t *buffer, size_t bufferSize)
+{
+    uint8_t transmitBuffer[2] = { COAX_COMMAND_RX };
+    uint8_t receiveBuffer[2];
+
+    size_t count = 0;
+    int error = 0;
+
+    ATOMIC_BLOCK_START;
+    LL_GPIO_ResetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+
+    spiTransfer(transmitBuffer, NULL, 1);
+
+    transmitBuffer[0] = 0x00;
+    transmitBuffer[1] = 0x00;
+
+    do {
+        spiTransfer(transmitBuffer, receiveBuffer, 2);
+
+        uint16_t value = (receiveBuffer[0] << 8) | receiveBuffer[1];
+
+        if (value & 0x8000) {
+            error = (-1) * (value & 0x03ff);
+
+            if (error == 0) {
+                Debug::trap(106);
+
+                error = COAX_ERROR_RX_UNKNOWN;
+            }
+
+            break;
+        } else if (value & 0x4000) {
+            break;
+        }
+
+        // TODO: can this ever happen... I don't think so now the loop has
+        // been rewritten.
+        if (count >= bufferSize) {
+            Debug::trap(107);
+            break;
+        }
+
+        buffer[count] = value & 0x03ff;
+
+        count++;
+    } while (count < bufferSize);
+
+    LL_GPIO_SetOutputPin(ICE40_CS_GPIO_Port, ICE40_CS_Pin);
+    ATOMIC_BLOCK_END;
+
+    if (error != 0) {
+        return error;
+    }
+
+    return count;
+}
+
+void SPICoaxTransceiver::setLoopback(bool loopback)
+{
+    writeRegister(COAX_REGISTER_CONTROL, loopback ? COAX_REGISTER_CONTROL_LOOPBACK : 0, COAX_REGISTER_CONTROL_LOOPBACK);
+}
+
+void SPICoaxTransceiver::setTXParity(CoaxParity parity)
+{
+    writeRegister(COAX_REGISTER_CONTROL, parity == CoaxParity::Even ? COAX_REGISTER_CONTROL_TX_PARITY : 0, COAX_REGISTER_CONTROL_TX_PARITY);
+}
+
+void SPICoaxTransceiver::setRXParity(CoaxParity parity)
+{
+    writeRegister(COAX_REGISTER_CONTROL, parity == CoaxParity::Even ? COAX_REGISTER_CONTROL_RX_PARITY : 0, COAX_REGISTER_CONTROL_RX_PARITY);
+}
+
+void SPICoaxTransceiver::spiTransfer(const uint8_t *transmitBuffer,
+        uint8_t *receiveBuffer, size_t count)
+{
+    // TODO: flush, or confirm TX ready?
+
+    for (size_t index = 0; index < count; index++) {
+        while (!(SPI1->SR & SPI_SR_TXE)) {
+            NOP;
+        }
+
+        LL_SPI_TransmitData8(SPI1, transmitBuffer[index]);
+
+        while (!LL_SPI_IsActiveFlag_RXNE(SPI1)) {
+            NOP;
+        }
+
+        uint8_t value = LL_SPI_ReceiveData8(SPI1);
+
+        if (receiveBuffer != NULL) {
+            receiveBuffer[index] = value;
+        }
+    }
+}

interface2/firmware/src/cubemx/startup_stm32l443xx.s

@@ -0,0 +1,468 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32l443xx.s
+  * @author    MCD Application Team
+  * @brief     STM32L443xx devices vector table for GCC toolchain.
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address,
+  *                - Configure the clock system  
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M4 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Apache License, Version 2.0,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/Apache-2.0
+  *
+  ******************************************************************************
+  */
+
+  .syntax unified
+	.cpu cortex-m4
+	.fpu softvfp
+	.thumb
+
+.global	g_pfnVectors
+.global	Default_Handler
+
+/* start address for the initialization values of the .data section.
+defined in linker script */
+.word	_sidata
+/* start address for the .data section. defined in linker script */
+.word	_sdata
+/* end address for the .data section. defined in linker script */
+.word	_edata
+/* start address for the .bss section. defined in linker script */
+.word	_sbss
+/* end address for the .bss section. defined in linker script */
+.word	_ebss
+
+.equ  BootRAM,        0xF1E0F85F
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called.
+ * @param  None
+ * @retval : None
+*/
+
+    .section	.text.Reset_Handler
+	.weak	Reset_Handler
+	.type	Reset_Handler, %function
+Reset_Handler:
+  ldr   sp, =_estack    /* Set stack pointer */
+
+/* Call the clock system initialization function.*/
+    bl  SystemInit
+
+/* Copy the data segment initializers from flash to SRAM */
+  movs	r1, #0
+  b	LoopCopyDataInit
+
+CopyDataInit:
+	ldr	r3, =_sidata
+	ldr	r3, [r3, r1]
+	str	r3, [r0, r1]
+	adds	r1, r1, #4
+
+LoopCopyDataInit:
+	ldr	r0, =_sdata
+	ldr	r3, =_edata
+	adds	r2, r0, r1
+	cmp	r2, r3
+	bcc	CopyDataInit
+	ldr	r2, =_sbss
+	b	LoopFillZerobss
+/* Zero fill the bss segment. */
+FillZerobss:
+	movs	r3, #0
+	str	r3, [r2], #4
+
+LoopFillZerobss:
+	ldr	r3, = _ebss
+	cmp	r2, r3
+	bcc	FillZerobss
+
+/* Call static constructors */
+    bl __libc_init_array
+/* Call the application's entry point.*/
+	bl	main
+
+LoopForever:
+    b LoopForever
+    
+.size	Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ *
+ * @param  None
+ * @retval : None
+*/
+    .section	.text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+	b	Infinite_Loop
+	.size	Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex-M4.  Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+*
+******************************************************************************/
+ 	.section	.isr_vector,"a",%progbits
+	.type	g_pfnVectors, %object
+	.size	g_pfnVectors, .-g_pfnVectors
+
+
+g_pfnVectors:
+	.word	_estack
+	.word	Reset_Handler
+	.word	NMI_Handler
+	.word	HardFault_Handler
+	.word	MemManage_Handler
+	.word	BusFault_Handler
+	.word	UsageFault_Handler
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	SVC_Handler
+	.word	DebugMon_Handler
+	.word	0
+	.word	PendSV_Handler
+	.word	SysTick_Handler
+	.word	WWDG_IRQHandler
+	.word	PVD_PVM_IRQHandler
+	.word	TAMP_STAMP_IRQHandler
+	.word	RTC_WKUP_IRQHandler
+	.word	FLASH_IRQHandler
+	.word	RCC_IRQHandler
+	.word	EXTI0_IRQHandler
+	.word	EXTI1_IRQHandler
+	.word	EXTI2_IRQHandler
+	.word	EXTI3_IRQHandler
+	.word	EXTI4_IRQHandler
+	.word	DMA1_Channel1_IRQHandler
+	.word	DMA1_Channel2_IRQHandler
+	.word	DMA1_Channel3_IRQHandler
+	.word	DMA1_Channel4_IRQHandler
+	.word	DMA1_Channel5_IRQHandler
+	.word	DMA1_Channel6_IRQHandler
+	.word	DMA1_Channel7_IRQHandler
+	.word	ADC1_IRQHandler
+	.word	CAN1_TX_IRQHandler
+	.word	CAN1_RX0_IRQHandler
+	.word	CAN1_RX1_IRQHandler
+	.word	CAN1_SCE_IRQHandler
+	.word	EXTI9_5_IRQHandler
+	.word	TIM1_BRK_TIM15_IRQHandler
+	.word	TIM1_UP_TIM16_IRQHandler
+	.word	TIM1_TRG_COM_IRQHandler
+	.word	TIM1_CC_IRQHandler
+	.word	TIM2_IRQHandler
+	.word	0
+	.word	0
+	.word	I2C1_EV_IRQHandler
+	.word	I2C1_ER_IRQHandler
+	.word	I2C2_EV_IRQHandler
+	.word	I2C2_ER_IRQHandler
+	.word	SPI1_IRQHandler
+	.word	SPI2_IRQHandler
+	.word	USART1_IRQHandler
+	.word	USART2_IRQHandler
+	.word	USART3_IRQHandler
+	.word	EXTI15_10_IRQHandler
+	.word	RTC_Alarm_IRQHandler
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	0
+	.word	SDMMC1_IRQHandler
+	.word	0
+	.word	SPI3_IRQHandler
+	.word	0
+	.word	0
+	.word	TIM6_DAC_IRQHandler
+	.word	TIM7_IRQHandler
+	.word	DMA2_Channel1_IRQHandler
+	.word	DMA2_Channel2_IRQHandler
+	.word	DMA2_Channel3_IRQHandler
+	.word	DMA2_Channel4_IRQHandler
+	.word	DMA2_Channel5_IRQHandler
+	.word	0
+	.word	0
+	.word	0
+	.word	COMP_IRQHandler
+	.word	LPTIM1_IRQHandler
+	.word	LPTIM2_IRQHandler
+	.word	USB_IRQHandler
+	.word	DMA2_Channel6_IRQHandler
+	.word	DMA2_Channel7_IRQHandler
+	.word	LPUART1_IRQHandler
+	.word	QUADSPI_IRQHandler
+	.word	I2C3_EV_IRQHandler
+	.word	I2C3_ER_IRQHandler
+	.word	SAI1_IRQHandler
+	.word	0
+	.word	SWPMI1_IRQHandler
+	.word	TSC_IRQHandler
+	.word	LCD_IRQHandler
+	.word	AES_IRQHandler
+	.word	RNG_IRQHandler
+	.word	FPU_IRQHandler
+	.word	CRS_IRQHandler
+
+
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler.
+* As they are weak aliases, any function with the same name will override
+* this definition.
+*
+*******************************************************************************/
+
+  .weak	NMI_Handler
+	.thumb_set NMI_Handler,Default_Handler
+
+  .weak	HardFault_Handler
+	.thumb_set HardFault_Handler,Default_Handler
+
+  .weak	MemManage_Handler
+	.thumb_set MemManage_Handler,Default_Handler
+
+  .weak	BusFault_Handler
+	.thumb_set BusFault_Handler,Default_Handler
+
+	.weak	UsageFault_Handler
+	.thumb_set UsageFault_Handler,Default_Handler
+
+	.weak	SVC_Handler
+	.thumb_set SVC_Handler,Default_Handler
+
+	.weak	DebugMon_Handler
+	.thumb_set DebugMon_Handler,Default_Handler
+
+	.weak	PendSV_Handler
+	.thumb_set PendSV_Handler,Default_Handler
+
+	.weak	SysTick_Handler
+	.thumb_set SysTick_Handler,Default_Handler
+
+	.weak	WWDG_IRQHandler
+	.thumb_set WWDG_IRQHandler,Default_Handler
+
+	.weak	PVD_PVM_IRQHandler
+	.thumb_set PVD_PVM_IRQHandler,Default_Handler
+
+	.weak	TAMP_STAMP_IRQHandler
+	.thumb_set TAMP_STAMP_IRQHandler,Default_Handler
+
+	.weak	RTC_WKUP_IRQHandler
+	.thumb_set RTC_WKUP_IRQHandler,Default_Handler
+
+	.weak	FLASH_IRQHandler
+	.thumb_set FLASH_IRQHandler,Default_Handler
+
+	.weak	RCC_IRQHandler
+	.thumb_set RCC_IRQHandler,Default_Handler
+
+	.weak	EXTI0_IRQHandler
+	.thumb_set EXTI0_IRQHandler,Default_Handler
+
+	.weak	EXTI1_IRQHandler
+	.thumb_set EXTI1_IRQHandler,Default_Handler
+
+	.weak	EXTI2_IRQHandler
+	.thumb_set EXTI2_IRQHandler,Default_Handler
+
+	.weak	EXTI3_IRQHandler
+	.thumb_set EXTI3_IRQHandler,Default_Handler
+
+	.weak	EXTI4_IRQHandler
+	.thumb_set EXTI4_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel1_IRQHandler
+	.thumb_set DMA1_Channel1_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel2_IRQHandler
+	.thumb_set DMA1_Channel2_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel3_IRQHandler
+	.thumb_set DMA1_Channel3_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel4_IRQHandler
+	.thumb_set DMA1_Channel4_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel5_IRQHandler
+	.thumb_set DMA1_Channel5_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel6_IRQHandler
+	.thumb_set DMA1_Channel6_IRQHandler,Default_Handler
+
+	.weak	DMA1_Channel7_IRQHandler
+	.thumb_set DMA1_Channel7_IRQHandler,Default_Handler
+
+	.weak	ADC1_IRQHandler
+	.thumb_set ADC1_IRQHandler,Default_Handler
+
+	.weak	CAN1_TX_IRQHandler
+	.thumb_set CAN1_TX_IRQHandler,Default_Handler
+
+	.weak	CAN1_RX0_IRQHandler
+	.thumb_set CAN1_RX0_IRQHandler,Default_Handler
+
+	.weak	CAN1_RX1_IRQHandler
+	.thumb_set CAN1_RX1_IRQHandler,Default_Handler
+
+	.weak	CAN1_SCE_IRQHandler
+	.thumb_set CAN1_SCE_IRQHandler,Default_Handler
+
+	.weak	EXTI9_5_IRQHandler
+	.thumb_set EXTI9_5_IRQHandler,Default_Handler
+
+	.weak	TIM1_BRK_TIM15_IRQHandler
+	.thumb_set TIM1_BRK_TIM15_IRQHandler,Default_Handler
+
+	.weak	TIM1_UP_TIM16_IRQHandler
+	.thumb_set TIM1_UP_TIM16_IRQHandler,Default_Handler
+
+	.weak	TIM1_TRG_COM_IRQHandler
+	.thumb_set TIM1_TRG_COM_IRQHandler,Default_Handler
+
+	.weak	TIM1_CC_IRQHandler
+	.thumb_set TIM1_CC_IRQHandler,Default_Handler
+
+	.weak	TIM2_IRQHandler
+	.thumb_set TIM2_IRQHandler,Default_Handler
+
+	.weak	I2C1_EV_IRQHandler
+	.thumb_set I2C1_EV_IRQHandler,Default_Handler
+
+	.weak	I2C1_ER_IRQHandler
+	.thumb_set I2C1_ER_IRQHandler,Default_Handler
+
+	.weak	I2C2_EV_IRQHandler
+	.thumb_set I2C2_EV_IRQHandler,Default_Handler
+
+	.weak	I2C2_ER_IRQHandler
+	.thumb_set I2C2_ER_IRQHandler,Default_Handler
+
+	.weak	SPI1_IRQHandler
+	.thumb_set SPI1_IRQHandler,Default_Handler
+
+	.weak	SPI2_IRQHandler
+	.thumb_set SPI2_IRQHandler,Default_Handler
+
+	.weak	USART1_IRQHandler
+	.thumb_set USART1_IRQHandler,Default_Handler
+
+	.weak	USART2_IRQHandler
+	.thumb_set USART2_IRQHandler,Default_Handler
+
+	.weak	USART3_IRQHandler
+	.thumb_set USART3_IRQHandler,Default_Handler
+
+	.weak	EXTI15_10_IRQHandler
+	.thumb_set EXTI15_10_IRQHandler,Default_Handler
+
+	.weak	RTC_Alarm_IRQHandler
+	.thumb_set RTC_Alarm_IRQHandler,Default_Handler
+
+	.weak	SDMMC1_IRQHandler
+	.thumb_set SDMMC1_IRQHandler,Default_Handler
+
+	.weak	SPI3_IRQHandler
+	.thumb_set SPI3_IRQHandler,Default_Handler
+
+	.weak	TIM6_DAC_IRQHandler
+	.thumb_set TIM6_DAC_IRQHandler,Default_Handler
+
+	.weak	TIM7_IRQHandler
+	.thumb_set TIM7_IRQHandler,Default_Handler
+
+	.weak	DMA2_Channel1_IRQHandler
+	.thumb_set DMA2_Channel1_IRQHandler,Default_Handler
+
+	.weak	DMA2_Channel2_IRQHandler
+	.thumb_set DMA2_Channel2_IRQHandler,Default_Handler
+
+	.weak	DMA2_Channel3_IRQHandler
+	.thumb_set DMA2_Channel3_IRQHandler,Default_Handler
+
+	.weak	DMA2_Channel4_IRQHandler
+	.thumb_set DMA2_Channel4_IRQHandler,Default_Handler
+
+	.weak	DMA2_Channel5_IRQHandler
+	.thumb_set DMA2_Channel5_IRQHandler,Default_Handler
+
+	.weak	COMP_IRQHandler
+	.thumb_set COMP_IRQHandler,Default_Handler
+	
+	.weak	LPTIM1_IRQHandler
+	.thumb_set LPTIM1_IRQHandler,Default_Handler
+	
+	.weak	LPTIM2_IRQHandler
+	.thumb_set LPTIM2_IRQHandler,Default_Handler	
+	
+	.weak	USB_IRQHandler
+	.thumb_set USB_IRQHandler,Default_Handler	
+	
+	.weak	DMA2_Channel6_IRQHandler
+	.thumb_set DMA2_Channel6_IRQHandler,Default_Handler	
+	
+	.weak	DMA2_Channel7_IRQHandler
+	.thumb_set DMA2_Channel7_IRQHandler,Default_Handler	
+	
+	.weak	LPUART1_IRQHandler
+	.thumb_set LPUART1_IRQHandler,Default_Handler	
+	
+	.weak	QUADSPI_IRQHandler
+	.thumb_set QUADSPI_IRQHandler,Default_Handler	
+	
+	.weak	I2C3_EV_IRQHandler
+	.thumb_set I2C3_EV_IRQHandler,Default_Handler	
+	
+	.weak	I2C3_ER_IRQHandler
+	.thumb_set I2C3_ER_IRQHandler,Default_Handler	
+	
+	.weak	SAI1_IRQHandler
+	.thumb_set SAI1_IRQHandler,Default_Handler
+	
+	.weak	SWPMI1_IRQHandler
+	.thumb_set SWPMI1_IRQHandler,Default_Handler
+	
+	.weak	TSC_IRQHandler
+	.thumb_set TSC_IRQHandler,Default_Handler
+	
+	.weak	LCD_IRQHandler
+	.thumb_set LCD_IRQHandler,Default_Handler
+	
+	.weak	AES_IRQHandler
+	.thumb_set AES_IRQHandler,Default_Handler
+	
+	.weak	RNG_IRQHandler
+	.thumb_set RNG_IRQHandler,Default_Handler
+	
+	.weak	FPU_IRQHandler
+	.thumb_set FPU_IRQHandler,Default_Handler
+	
+	.weak	CRS_IRQHandler
+	.thumb_set CRS_IRQHandler,Default_Handler
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/stm32l4xx_hal_msp.c

@@ -0,0 +1,84 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * File Name          : stm32l4xx_hal_msp.c
+  * Description        : This file provides code for the MSP Initialization
+  *                      and de-Initialization codes.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* Private typedef -----------------------------------------------------------*/
+/* USER CODE BEGIN TD */
+
+/* USER CODE END TD */
+
+/* Private define ------------------------------------------------------------*/
+/* USER CODE BEGIN Define */
+
+/* USER CODE END Define */
+
+/* Private macro -------------------------------------------------------------*/
+/* USER CODE BEGIN Macro */
+
+/* USER CODE END Macro */
+
+/* Private variables ---------------------------------------------------------*/
+/* USER CODE BEGIN PV */
+
+/* USER CODE END PV */
+
+/* Private function prototypes -----------------------------------------------*/
+/* USER CODE BEGIN PFP */
+
+/* USER CODE END PFP */
+
+/* External functions --------------------------------------------------------*/
+/* USER CODE BEGIN ExternalFunctions */
+
+/* USER CODE END ExternalFunctions */
+
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+/**
+  * Initializes the Global MSP.
+  */
+void HAL_MspInit(void)
+{
+  /* USER CODE BEGIN MspInit 0 */
+
+  /* USER CODE END MspInit 0 */
+
+  __HAL_RCC_SYSCFG_CLK_ENABLE();
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* System interrupt init*/
+
+  /* USER CODE BEGIN MspInit 1 */
+
+  /* USER CODE END MspInit 1 */
+}
+
+/* USER CODE BEGIN 1 */
+
+/* USER CODE END 1 */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/stm32l4xx_it.c

@@ -0,0 +1,246 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    stm32l4xx_it.c
+  * @brief   Interrupt Service Routines.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+#include "stm32l4xx_it.h"
+/* Private includes ----------------------------------------------------------*/
+/* USER CODE BEGIN Includes */
+/* USER CODE END Includes */
+
+/* Private typedef -----------------------------------------------------------*/
+/* USER CODE BEGIN TD */
+
+/* USER CODE END TD */
+
+/* Private define ------------------------------------------------------------*/
+/* USER CODE BEGIN PD */
+
+/* USER CODE END PD */
+
+/* Private macro -------------------------------------------------------------*/
+/* USER CODE BEGIN PM */
+
+/* USER CODE END PM */
+
+/* Private variables ---------------------------------------------------------*/
+/* USER CODE BEGIN PV */
+
+/* USER CODE END PV */
+
+/* Private function prototypes -----------------------------------------------*/
+/* USER CODE BEGIN PFP */
+
+/* USER CODE END PFP */
+
+/* Private user code ---------------------------------------------------------*/
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+/* External variables --------------------------------------------------------*/
+extern PCD_HandleTypeDef hpcd_USB_FS;
+extern TIM_HandleTypeDef htim6;
+/* USER CODE BEGIN EV */
+
+/* USER CODE END EV */
+
+/******************************************************************************/
+/*           Cortex-M4 Processor Interruption and Exception Handlers          */
+/******************************************************************************/
+/**
+  * @brief This function handles Non maskable interrupt.
+  */
+void NMI_Handler(void)
+{
+  /* USER CODE BEGIN NonMaskableInt_IRQn 0 */
+
+  /* USER CODE END NonMaskableInt_IRQn 0 */
+  /* USER CODE BEGIN NonMaskableInt_IRQn 1 */
+
+  /* USER CODE END NonMaskableInt_IRQn 1 */
+}
+
+/**
+  * @brief This function handles Hard fault interrupt.
+  */
+void HardFault_Handler(void)
+{
+  /* USER CODE BEGIN HardFault_IRQn 0 */
+
+  /* USER CODE END HardFault_IRQn 0 */
+  while (1)
+  {
+    /* USER CODE BEGIN W1_HardFault_IRQn 0 */
+    /* USER CODE END W1_HardFault_IRQn 0 */
+  }
+}
+
+/**
+  * @brief This function handles Memory management fault.
+  */
+void MemManage_Handler(void)
+{
+  /* USER CODE BEGIN MemoryManagement_IRQn 0 */
+
+  /* USER CODE END MemoryManagement_IRQn 0 */
+  while (1)
+  {
+    /* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
+    /* USER CODE END W1_MemoryManagement_IRQn 0 */
+  }
+}
+
+/**
+  * @brief This function handles Prefetch fault, memory access fault.
+  */
+void BusFault_Handler(void)
+{
+  /* USER CODE BEGIN BusFault_IRQn 0 */
+
+  /* USER CODE END BusFault_IRQn 0 */
+  while (1)
+  {
+    /* USER CODE BEGIN W1_BusFault_IRQn 0 */
+    /* USER CODE END W1_BusFault_IRQn 0 */
+  }
+}
+
+/**
+  * @brief This function handles Undefined instruction or illegal state.
+  */
+void UsageFault_Handler(void)
+{
+  /* USER CODE BEGIN UsageFault_IRQn 0 */
+
+  /* USER CODE END UsageFault_IRQn 0 */
+  while (1)
+  {
+    /* USER CODE BEGIN W1_UsageFault_IRQn 0 */
+    /* USER CODE END W1_UsageFault_IRQn 0 */
+  }
+}
+
+/**
+  * @brief This function handles System service call via SWI instruction.
+  */
+void SVC_Handler(void)
+{
+  /* USER CODE BEGIN SVCall_IRQn 0 */
+
+  /* USER CODE END SVCall_IRQn 0 */
+  /* USER CODE BEGIN SVCall_IRQn 1 */
+
+  /* USER CODE END SVCall_IRQn 1 */
+}
+
+/**
+  * @brief This function handles Debug monitor.
+  */
+void DebugMon_Handler(void)
+{
+  /* USER CODE BEGIN DebugMonitor_IRQn 0 */
+
+  /* USER CODE END DebugMonitor_IRQn 0 */
+  /* USER CODE BEGIN DebugMonitor_IRQn 1 */
+
+  /* USER CODE END DebugMonitor_IRQn 1 */
+}
+
+/**
+  * @brief This function handles Pendable request for system service.
+  */
+void PendSV_Handler(void)
+{
+  /* USER CODE BEGIN PendSV_IRQn 0 */
+
+  /* USER CODE END PendSV_IRQn 0 */
+  /* USER CODE BEGIN PendSV_IRQn 1 */
+
+  /* USER CODE END PendSV_IRQn 1 */
+}
+
+/**
+  * @brief This function handles System tick timer.
+  */
+void SysTick_Handler(void)
+{
+  /* USER CODE BEGIN SysTick_IRQn 0 */
+
+  /* USER CODE END SysTick_IRQn 0 */
+  HAL_IncTick();
+  /* USER CODE BEGIN SysTick_IRQn 1 */
+
+  /* USER CODE END SysTick_IRQn 1 */
+}
+
+/******************************************************************************/
+/* STM32L4xx Peripheral Interrupt Handlers                                    */
+/* Add here the Interrupt Handlers for the used peripherals.                  */
+/* For the available peripheral interrupt handler names,                      */
+/* please refer to the startup file (startup_stm32l4xx.s).                    */
+/******************************************************************************/
+
+/**
+  * @brief This function handles EXTI line0 interrupt.
+  */
+void EXTI0_IRQHandler(void)
+{
+  /* USER CODE BEGIN EXTI0_IRQn 0 */
+
+  /* USER CODE END EXTI0_IRQn 0 */
+  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
+  /* USER CODE BEGIN EXTI0_IRQn 1 */
+
+  /* USER CODE END EXTI0_IRQn 1 */
+}
+
+/**
+  * @brief This function handles TIM6 global interrupt, DAC channel1 and channel2 underrun error interrupts.
+  */
+void TIM6_DAC_IRQHandler(void)
+{
+  /* USER CODE BEGIN TIM6_DAC_IRQn 0 */
+
+  /* USER CODE END TIM6_DAC_IRQn 0 */
+  HAL_TIM_IRQHandler(&htim6);
+  /* USER CODE BEGIN TIM6_DAC_IRQn 1 */
+
+  /* USER CODE END TIM6_DAC_IRQn 1 */
+}
+
+/**
+  * @brief This function handles USB event interrupt through EXTI line 17.
+  */
+void USB_IRQHandler(void)
+{
+  /* USER CODE BEGIN USB_IRQn 0 */
+
+  /* USER CODE END USB_IRQn 0 */
+  HAL_PCD_IRQHandler(&hpcd_USB_FS);
+  /* USER CODE BEGIN USB_IRQn 1 */
+
+  /* USER CODE END USB_IRQn 1 */
+}
+
+/* USER CODE BEGIN 1 */
+
+/* USER CODE END 1 */
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/system_stm32l4xx.c

@@ -0,0 +1,354 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32l4xx.c
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File
+  *
+  *   This file provides two functions and one global variable to be called from
+  *   user application:
+  *      - SystemInit(): This function is called at startup just after reset and
+  *                      before branch to main program. This call is made inside
+  *                      the "startup_stm32l4xx.s" file.
+  *
+  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+  *                                  by the user application to setup the SysTick
+  *                                  timer or configure other parameters.
+  *
+  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+  *                                 be called whenever the core clock is changed
+  *                                 during program execution.
+  *
+  *   After each device reset the MSI (4 MHz) is used as system clock source.
+  *   Then SystemInit() function is called, in "startup_stm32l4xx.s" file, to
+  *   configure the system clock before to branch to main program.
+  *
+  *   This file configures the system clock as follows:
+  *=============================================================================
+  *-----------------------------------------------------------------------------
+  *        System Clock source                    | MSI
+  *-----------------------------------------------------------------------------
+  *        SYSCLK(Hz)                             | 4000000
+  *-----------------------------------------------------------------------------
+  *        HCLK(Hz)                               | 4000000
+  *-----------------------------------------------------------------------------
+  *        AHB Prescaler                          | 1
+  *-----------------------------------------------------------------------------
+  *        APB1 Prescaler                         | 1
+  *-----------------------------------------------------------------------------
+  *        APB2 Prescaler                         | 1
+  *-----------------------------------------------------------------------------
+  *        PLL_M                                  | 1
+  *-----------------------------------------------------------------------------
+  *        PLL_N                                  | 8
+  *-----------------------------------------------------------------------------
+  *        PLL_P                                  | 7
+  *-----------------------------------------------------------------------------
+  *        PLL_Q                                  | 2
+  *-----------------------------------------------------------------------------
+  *        PLL_R                                  | 2
+  *-----------------------------------------------------------------------------
+  *        PLLSAI1_P                              | NA
+  *-----------------------------------------------------------------------------
+  *        PLLSAI1_Q                              | NA
+  *-----------------------------------------------------------------------------
+  *        PLLSAI1_R                              | NA
+  *-----------------------------------------------------------------------------
+  *        PLLSAI2_P                              | NA
+  *-----------------------------------------------------------------------------
+  *        PLLSAI2_Q                              | NA
+  *-----------------------------------------------------------------------------
+  *        PLLSAI2_R                              | NA
+  *-----------------------------------------------------------------------------
+  *        Require 48MHz for USB OTG FS,          | Disabled
+  *        SDIO and RNG clock                     |
+  *-----------------------------------------------------------------------------
+  *=============================================================================
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Apache License, Version 2.0,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/Apache-2.0
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32l4xx_system
+  * @{
+  */
+
+/** @addtogroup STM32L4xx_System_Private_Includes
+  * @{
+  */
+
+#include "stm32l4xx.h"
+
+#if !defined  (HSE_VALUE)
+  #define HSE_VALUE    8000000U  /*!< Value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (MSI_VALUE)
+  #define MSI_VALUE    4000000U  /*!< Value of the Internal oscillator in Hz*/
+#endif /* MSI_VALUE */
+
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    16000000U /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32L4xx_System_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32L4xx_System_Private_Defines
+  * @{
+  */
+
+/************************* Miscellaneous Configuration ************************/
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET  0x00 /*!< Vector Table base offset field.
+                                   This value must be a multiple of 0x200. */
+/******************************************************************************/
+/**
+  * @}
+  */
+
+/** @addtogroup STM32L4xx_System_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32L4xx_System_Private_Variables
+  * @{
+  */
+  /* The SystemCoreClock variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+  uint32_t SystemCoreClock = 4000000U;
+
+  const uint8_t  AHBPrescTable[16] = {0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U, 6U, 7U, 8U, 9U};
+  const uint8_t  APBPrescTable[8] =  {0U, 0U, 0U, 0U, 1U, 2U, 3U, 4U};
+  const uint32_t MSIRangeTable[12] = {100000U,   200000U,   400000U,   800000U,  1000000U,  2000000U, \
+                                      4000000U, 8000000U, 16000000U, 24000000U, 32000000U, 48000000U};
+/**
+  * @}
+  */
+
+/** @addtogroup STM32L4xx_System_Private_FunctionPrototypes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32L4xx_System_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Setup the microcontroller system.
+  * @param  None
+  * @retval None
+  */
+extern uint32_t bootMagic;
+
+void SystemInit(void)
+{
+    // Enter the DFU bootloader if the magic flag is set.
+    if (bootMagic == 0x32703270) {
+        bootMagic = 0x00000000;
+
+        uint32_t address = 0x1fff0000;
+
+        void (*bootloader)(void) = (void (*)(void)) (*((uint32_t *) (address + 4)));
+
+        __set_MSP(*(uint32_t *) address);
+
+        bootloader();
+
+        while (1) {
+        }
+    }
+
+  /* FPU settings ------------------------------------------------------------*/
+  #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
+    SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2));  /* set CP10 and CP11 Full Access */
+  #endif
+
+  /* Reset the RCC clock configuration to the default reset state ------------*/
+  /* Set MSION bit */
+  RCC->CR |= RCC_CR_MSION;
+
+  /* Reset CFGR register */
+  RCC->CFGR = 0x00000000U;
+
+  /* Reset HSEON, CSSON , HSION, and PLLON bits */
+  RCC->CR &= 0xEAF6FFFFU;
+
+  /* Reset PLLCFGR register */
+  RCC->PLLCFGR = 0x00001000U;
+
+  /* Reset HSEBYP bit */
+  RCC->CR &= 0xFFFBFFFFU;
+
+  /* Disable all interrupts */
+  RCC->CIER = 0x00000000U;
+
+  /* Configure the Vector Table location add offset address ------------------*/
+#ifdef VECT_TAB_SRAM
+  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+#else
+  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
+#endif
+}
+
+/**
+  * @brief  Update SystemCoreClock variable according to Clock Register Values.
+  *         The SystemCoreClock variable contains the core clock (HCLK), it can
+  *         be used by the user application to setup the SysTick timer or configure
+  *         other parameters.
+  *
+  * @note   Each time the core clock (HCLK) changes, this function must be called
+  *         to update SystemCoreClock variable value. Otherwise, any configuration
+  *         based on this variable will be incorrect.
+  *
+  * @note   - The system frequency computed by this function is not the real
+  *           frequency in the chip. It is calculated based on the predefined
+  *           constant and the selected clock source:
+  *
+  *           - If SYSCLK source is MSI, SystemCoreClock will contain the MSI_VALUE(*)
+  *
+  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(**)
+  *
+  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(***)
+  *
+  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(***)
+  *             or HSI_VALUE(*) or MSI_VALUE(*) multiplied/divided by the PLL factors.
+  *
+  *         (*) MSI_VALUE is a constant defined in stm32l4xx_hal.h file (default value
+  *             4 MHz) but the real value may vary depending on the variations
+  *             in voltage and temperature.
+  *
+  *         (**) HSI_VALUE is a constant defined in stm32l4xx_hal.h file (default value
+  *              16 MHz) but the real value may vary depending on the variations
+  *              in voltage and temperature.
+  *
+  *         (***) HSE_VALUE is a constant defined in stm32l4xx_hal.h file (default value
+  *              8 MHz), user has to ensure that HSE_VALUE is same as the real
+  *              frequency of the crystal used. Otherwise, this function may
+  *              have wrong result.
+  *
+  *         - The result of this function could be not correct when using fractional
+  *           value for HSE crystal.
+  *
+  * @param  None
+  * @retval None
+  */
+void SystemCoreClockUpdate(void)
+{
+  uint32_t tmp = 0U, msirange = 0U, pllvco = 0U, pllr = 2U, pllsource = 0U, pllm = 2U;
+
+  /* Get MSI Range frequency--------------------------------------------------*/
+  if((RCC->CR & RCC_CR_MSIRGSEL) == RESET)
+  { /* MSISRANGE from RCC_CSR applies */
+    msirange = (RCC->CSR & RCC_CSR_MSISRANGE) >> 8U;
+  }
+  else
+  { /* MSIRANGE from RCC_CR applies */
+    msirange = (RCC->CR & RCC_CR_MSIRANGE) >> 4U;
+  }
+  /*MSI frequency range in HZ*/
+  msirange = MSIRangeTable[msirange];
+
+  /* Get SYSCLK source -------------------------------------------------------*/
+  switch (RCC->CFGR & RCC_CFGR_SWS)
+  {
+    case 0x00:  /* MSI used as system clock source */
+      SystemCoreClock = msirange;
+      break;
+
+    case 0x04:  /* HSI used as system clock source */
+      SystemCoreClock = HSI_VALUE;
+      break;
+
+    case 0x08:  /* HSE used as system clock source */
+      SystemCoreClock = HSE_VALUE;
+      break;
+
+    case 0x0C:  /* PLL used as system clock  source */
+      /* PLL_VCO = (HSE_VALUE or HSI_VALUE or MSI_VALUE/ PLLM) * PLLN
+         SYSCLK = PLL_VCO / PLLR
+         */
+      pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC);
+      pllm = ((RCC->PLLCFGR & RCC_PLLCFGR_PLLM) >> 4U) + 1U ;
+
+      switch (pllsource)
+      {
+        case 0x02:  /* HSI used as PLL clock source */
+          pllvco = (HSI_VALUE / pllm);
+          break;
+
+        case 0x03:  /* HSE used as PLL clock source */
+          pllvco = (HSE_VALUE / pllm);
+          break;
+
+        default:    /* MSI used as PLL clock source */
+          pllvco = (msirange / pllm);
+          break;
+      }
+      pllvco = pllvco * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 8U);
+      pllr = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLR) >> 25U) + 1U) * 2U;
+      SystemCoreClock = pllvco/pllr;
+      break;
+
+    default:
+      SystemCoreClock = msirange;
+      break;
+  }
+  /* Compute HCLK clock frequency --------------------------------------------*/
+  /* Get HCLK prescaler */
+  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4U)];
+  /* HCLK clock frequency */
+  SystemCoreClock >>= tmp;
+}
+
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/tim.c

@@ -0,0 +1,95 @@
+/**
+  ******************************************************************************
+  * File Name          : TIM.c
+  * Description        : This file provides code for the configuration
+  *                      of the TIM instances.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "tim.h"
+
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+TIM_HandleTypeDef htim6;
+
+/* TIM6 init function */
+void MX_TIM6_Init(void)
+{
+  TIM_MasterConfigTypeDef sMasterConfig = {0};
+
+  htim6.Instance = TIM6;
+  htim6.Init.Prescaler = 8000-1;
+  htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
+  htim6.Init.Period = 1000-1;
+  htim6.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
+  if (HAL_TIM_Base_Init(&htim6) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
+  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
+  if (HAL_TIMEx_MasterConfigSynchronization(&htim6, &sMasterConfig) != HAL_OK)
+  {
+    Error_Handler();
+  }
+
+}
+
+void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
+{
+
+  if(tim_baseHandle->Instance==TIM6)
+  {
+  /* USER CODE BEGIN TIM6_MspInit 0 */
+
+  /* USER CODE END TIM6_MspInit 0 */
+    /* TIM6 clock enable */
+    __HAL_RCC_TIM6_CLK_ENABLE();
+
+    /* TIM6 interrupt Init */
+    HAL_NVIC_SetPriority(TIM6_DAC_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);
+  /* USER CODE BEGIN TIM6_MspInit 1 */
+
+  /* USER CODE END TIM6_MspInit 1 */
+  }
+}
+
+void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* tim_baseHandle)
+{
+
+  if(tim_baseHandle->Instance==TIM6)
+  {
+  /* USER CODE BEGIN TIM6_MspDeInit 0 */
+
+  /* USER CODE END TIM6_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_TIM6_CLK_DISABLE();
+
+    /* TIM6 interrupt Deinit */
+    HAL_NVIC_DisableIRQ(TIM6_DAC_IRQn);
+  /* USER CODE BEGIN TIM6_MspDeInit 1 */
+
+  /* USER CODE END TIM6_MspDeInit 1 */
+  }
+}
+
+/* USER CODE BEGIN 1 */
+
+/* USER CODE END 1 */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/usb_device.c

@@ -0,0 +1,102 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : usb_device.c
+  * @version        : v2.0_Cube
+  * @brief          : This file implements the USB Device
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+
+#include "usb_device.h"
+#include "usbd_core.h"
+#include "usbd_desc.h"
+#include "usbd_cdc.h"
+#include "usbd_cdc_if.h"
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* USER CODE BEGIN PV */
+/* Private variables ---------------------------------------------------------*/
+
+/* USER CODE END PV */
+
+/* USER CODE BEGIN PFP */
+/* Private function prototypes -----------------------------------------------*/
+
+/* USER CODE END PFP */
+
+/* USB Device Core handle declaration. */
+USBD_HandleTypeDef hUsbDeviceFS;
+extern USBD_DescriptorsTypeDef FS_Desc;
+
+/*
+ * -- Insert your variables declaration here --
+ */
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+/*
+ * -- Insert your external function declaration here --
+ */
+/* USER CODE BEGIN 1 */
+
+/* USER CODE END 1 */
+
+/**
+  * Init USB device Library, add supported class and start the library
+  * @retval None
+  */
+void MX_USB_DEVICE_Init(void)
+{
+  /* USER CODE BEGIN USB_DEVICE_Init_PreTreatment */
+
+  /* USER CODE END USB_DEVICE_Init_PreTreatment */
+
+  /* Init Device Library, add supported class and start the library. */
+  if (USBD_Init(&hUsbDeviceFS, &FS_Desc, DEVICE_FS) != USBD_OK)
+  {
+    Error_Handler();
+  }
+  if (USBD_RegisterClass(&hUsbDeviceFS, &USBD_CDC) != USBD_OK)
+  {
+    Error_Handler();
+  }
+  if (USBD_CDC_RegisterInterface(&hUsbDeviceFS, &USBD_Interface_fops_FS) != USBD_OK)
+  {
+    Error_Handler();
+  }
+  if (USBD_Start(&hUsbDeviceFS) != USBD_OK)
+  {
+    Error_Handler();
+  }
+  /* USER CODE BEGIN USB_DEVICE_Init_PostTreatment */
+
+  /* USER CODE END USB_DEVICE_Init_PostTreatment */
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/usbd_cdc_if.c

@@ -0,0 +1,336 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : usbd_cdc_if.c
+  * @version        : v2.0_Cube
+  * @brief          : Usb device for Virtual Com Port.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "usbd_cdc_if.h"
+
+/* USER CODE BEGIN INCLUDE */
+
+/* USER CODE END INCLUDE */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+
+/* USER CODE BEGIN PV */
+/* Private variables ---------------------------------------------------------*/
+
+/* USER CODE END PV */
+
+/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
+  * @brief Usb device library.
+  * @{
+  */
+
+/** @addtogroup USBD_CDC_IF
+  * @{
+  */
+
+/** @defgroup USBD_CDC_IF_Private_TypesDefinitions USBD_CDC_IF_Private_TypesDefinitions
+  * @brief Private types.
+  * @{
+  */
+
+/* USER CODE BEGIN PRIVATE_TYPES */
+
+extern void handleMessageData(const uint8_t *buffer, size_t bufferCount);
+
+/* USER CODE END PRIVATE_TYPES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Private_Defines USBD_CDC_IF_Private_Defines
+  * @brief Private defines.
+  * @{
+  */
+
+/* USER CODE BEGIN PRIVATE_DEFINES */
+/* USER CODE END PRIVATE_DEFINES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Private_Macros USBD_CDC_IF_Private_Macros
+  * @brief Private macros.
+  * @{
+  */
+
+/* USER CODE BEGIN PRIVATE_MACRO */
+
+/* USER CODE END PRIVATE_MACRO */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Private_Variables USBD_CDC_IF_Private_Variables
+  * @brief Private variables.
+  * @{
+  */
+/* Create buffer for reception and transmission           */
+/* It's up to user to redefine and/or remove those define */
+/** Received data over USB are stored in this buffer      */
+uint8_t UserRxBufferFS[APP_RX_DATA_SIZE];
+
+/** Data to send over USB CDC are stored in this buffer   */
+uint8_t UserTxBufferFS[APP_TX_DATA_SIZE];
+
+/* USER CODE BEGIN PRIVATE_VARIABLES */
+
+/* USER CODE END PRIVATE_VARIABLES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
+  * @brief Public variables.
+  * @{
+  */
+
+extern USBD_HandleTypeDef hUsbDeviceFS;
+
+/* USER CODE BEGIN EXPORTED_VARIABLES */
+
+/* USER CODE END EXPORTED_VARIABLES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_CDC_IF_Private_FunctionPrototypes USBD_CDC_IF_Private_FunctionPrototypes
+  * @brief Private functions declaration.
+  * @{
+  */
+
+static int8_t CDC_Init_FS(void);
+static int8_t CDC_DeInit_FS(void);
+static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length);
+static int8_t CDC_Receive_FS(uint8_t* pbuf, uint32_t *Len);
+static int8_t CDC_TransmitCplt_FS(uint8_t *pbuf, uint32_t *Len, uint8_t epnum);
+
+/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */
+
+/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */
+
+/**
+  * @}
+  */
+
+USBD_CDC_ItfTypeDef USBD_Interface_fops_FS =
+{
+  CDC_Init_FS,
+  CDC_DeInit_FS,
+  CDC_Control_FS,
+  CDC_Receive_FS,
+  CDC_TransmitCplt_FS
+};
+
+/* Private functions ---------------------------------------------------------*/
+/**
+  * @brief  Initializes the CDC media low layer over the FS USB IP
+  * @retval USBD_OK if all operations are OK else USBD_FAIL
+  */
+static int8_t CDC_Init_FS(void)
+{
+  /* USER CODE BEGIN 3 */
+  /* Set Application Buffers */
+  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, UserTxBufferFS, 0);
+  USBD_CDC_SetRxBuffer(&hUsbDeviceFS, UserRxBufferFS);
+  return (USBD_OK);
+  /* USER CODE END 3 */
+}
+
+/**
+  * @brief  DeInitializes the CDC media low layer
+  * @retval USBD_OK if all operations are OK else USBD_FAIL
+  */
+static int8_t CDC_DeInit_FS(void)
+{
+  /* USER CODE BEGIN 4 */
+  return (USBD_OK);
+  /* USER CODE END 4 */
+}
+
+/**
+  * @brief  Manage the CDC class requests
+  * @param  cmd: Command code
+  * @param  pbuf: Buffer containing command data (request parameters)
+  * @param  length: Number of data to be sent (in bytes)
+  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
+  */
+static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length)
+{
+  /* USER CODE BEGIN 5 */
+  switch(cmd)
+  {
+    case CDC_SEND_ENCAPSULATED_COMMAND:
+
+    break;
+
+    case CDC_GET_ENCAPSULATED_RESPONSE:
+
+    break;
+
+    case CDC_SET_COMM_FEATURE:
+
+    break;
+
+    case CDC_GET_COMM_FEATURE:
+
+    break;
+
+    case CDC_CLEAR_COMM_FEATURE:
+
+    break;
+
+  /*******************************************************************************/
+  /* Line Coding Structure                                                       */
+  /*-----------------------------------------------------------------------------*/
+  /* Offset | Field       | Size | Value  | Description                          */
+  /* 0      | dwDTERate   |   4  | Number |Data terminal rate, in bits per second*/
+  /* 4      | bCharFormat |   1  | Number | Stop bits                            */
+  /*                                        0 - 1 Stop bit                       */
+  /*                                        1 - 1.5 Stop bits                    */
+  /*                                        2 - 2 Stop bits                      */
+  /* 5      | bParityType |  1   | Number | Parity                               */
+  /*                                        0 - None                             */
+  /*                                        1 - Odd                              */
+  /*                                        2 - Even                             */
+  /*                                        3 - Mark                             */
+  /*                                        4 - Space                            */
+  /* 6      | bDataBits  |   1   | Number Data bits (5, 6, 7, 8 or 16).          */
+  /*******************************************************************************/
+    case CDC_SET_LINE_CODING:
+
+    break;
+
+    case CDC_GET_LINE_CODING:
+
+    break;
+
+    case CDC_SET_CONTROL_LINE_STATE:
+
+    break;
+
+    case CDC_SEND_BREAK:
+
+    break;
+
+  default:
+    break;
+  }
+
+  return (USBD_OK);
+  /* USER CODE END 5 */
+}
+
+/**
+  * @brief  Data received over USB OUT endpoint are sent over CDC interface
+  *         through this function.
+  *
+  *         @note
+  *         This function will issue a NAK packet on any OUT packet received on
+  *         USB endpoint until exiting this function. If you exit this function
+  *         before transfer is complete on CDC interface (ie. using DMA controller)
+  *         it will result in receiving more data while previous ones are still
+  *         not sent.
+  *
+  * @param  Buf: Buffer of data to be received
+  * @param  Len: Number of data received (in bytes)
+  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
+  */
+static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
+{
+  /* USER CODE BEGIN 6 */
+  handleMessageData(Buf, *Len);
+
+  USBD_CDC_ReceivePacket(&hUsbDeviceFS);
+
+  return (USBD_OK);
+  /* USER CODE END 6 */
+}
+
+/**
+  * @brief  CDC_Transmit_FS
+  *         Data to send over USB IN endpoint are sent over CDC interface
+  *         through this function.
+  *         @note
+  *
+  *
+  * @param  Buf: Buffer of data to be sent
+  * @param  Len: Number of data to be sent (in bytes)
+  * @retval USBD_OK if all operations are OK else USBD_FAIL or USBD_BUSY
+  */
+uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len)
+{
+  uint8_t result = USBD_OK;
+  /* USER CODE BEGIN 7 */
+  USBD_CDC_HandleTypeDef *hcdc = (USBD_CDC_HandleTypeDef*)hUsbDeviceFS.pClassData;
+  if (hcdc->TxState != 0){
+    return USBD_BUSY;
+  }
+  memcpy(UserTxBufferFS, Buf, Len);
+  USBD_CDC_SetTxBuffer(&hUsbDeviceFS, UserTxBufferFS, Len);
+  result = USBD_CDC_TransmitPacket(&hUsbDeviceFS);
+  /* USER CODE END 7 */
+  return result;
+}
+
+/**
+  * @brief  CDC_TransmitCplt_FS
+  *         Data transmited callback
+  *
+  *         @note
+  *         This function is IN transfer complete callback used to inform user that
+  *         the submitted Data is successfully sent over USB.
+  *
+  * @param  Buf: Buffer of data to be received
+  * @param  Len: Number of data received (in bytes)
+  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
+  */
+static int8_t CDC_TransmitCplt_FS(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
+{
+  uint8_t result = USBD_OK;
+  /* USER CODE BEGIN 13 */
+  UNUSED(Buf);
+  UNUSED(Len);
+  UNUSED(epnum);
+  /* USER CODE END 13 */
+  return result;
+}
+
+/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */
+
+/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/usbd_conf.c

@@ -0,0 +1,828 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : Target/usbd_conf.c
+  * @version        : v2.0_Cube
+  * @brief          : This file implements the board support package for the USB device library
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32l4xx.h"
+#include "stm32l4xx_hal.h"
+#include "usbd_def.h"
+#include "usbd_core.h"
+#include "usbd_cdc.h"
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+
+/* USER CODE BEGIN PV */
+/* Private variables ---------------------------------------------------------*/
+
+/* USER CODE END PV */
+
+PCD_HandleTypeDef hpcd_USB_FS;
+void Error_Handler(void);
+
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+/* Exported function prototypes ----------------------------------------------*/
+extern USBD_StatusTypeDef USBD_LL_BatteryCharging(USBD_HandleTypeDef *pdev);
+
+/* USER CODE BEGIN PFP */
+/* Private function prototypes -----------------------------------------------*/
+
+/* USER CODE END PFP */
+
+/* Private functions ---------------------------------------------------------*/
+
+/* USER CODE BEGIN 1 */
+static void SystemClockConfig_Resume(void);
+
+/* USER CODE END 1 */
+extern void SystemClock_Config(void);
+
+/*******************************************************************************
+                       LL Driver Callbacks (PCD -> USB Device Library)
+*******************************************************************************/
+/* MSP Init */
+
+void HAL_PCD_MspInit(PCD_HandleTypeDef* pcdHandle)
+{
+  if(pcdHandle->Instance==USB)
+  {
+  /* USER CODE BEGIN USB_MspInit 0 */
+
+  /* USER CODE END USB_MspInit 0 */
+    /* Peripheral clock enable */
+    __HAL_RCC_USB_CLK_ENABLE();
+
+    /* Peripheral interrupt init */
+    HAL_NVIC_SetPriority(USB_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USB_IRQn);
+  /* USER CODE BEGIN USB_MspInit 1 */
+
+  /* USER CODE END USB_MspInit 1 */
+  }
+}
+
+void HAL_PCD_MspDeInit(PCD_HandleTypeDef* pcdHandle)
+{
+  if(pcdHandle->Instance==USB)
+  {
+  /* USER CODE BEGIN USB_MspDeInit 0 */
+
+  /* USER CODE END USB_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_USB_CLK_DISABLE();
+
+    /* Peripheral interrupt Deinit*/
+    HAL_NVIC_DisableIRQ(USB_IRQn);
+
+  /* USER CODE BEGIN USB_MspDeInit 1 */
+
+  /* USER CODE END USB_MspDeInit 1 */
+  }
+}
+
+/**
+  * @brief  Setup stage callback
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_SetupStageCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_SetupStageCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_SetupStage((USBD_HandleTypeDef*)hpcd->pData, (uint8_t *)hpcd->Setup);
+}
+
+/**
+  * @brief  Data Out stage callback.
+  * @param  hpcd: PCD handle
+  * @param  epnum: Endpoint number
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_DataOutStageCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#else
+void HAL_PCD_DataOutStageCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_DataOutStage((USBD_HandleTypeDef*)hpcd->pData, epnum, hpcd->OUT_ep[epnum].xfer_buff);
+}
+
+/**
+  * @brief  Data In stage callback.
+  * @param  hpcd: PCD handle
+  * @param  epnum: Endpoint number
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_DataInStageCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#else
+void HAL_PCD_DataInStageCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_DataInStage((USBD_HandleTypeDef*)hpcd->pData, epnum, hpcd->IN_ep[epnum].xfer_buff);
+}
+
+/**
+  * @brief  SOF callback.
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_SOFCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_SOF((USBD_HandleTypeDef*)hpcd->pData);
+}
+
+/**
+  * @brief  Reset callback.
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_ResetCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_ResetCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_SpeedTypeDef speed = USBD_SPEED_FULL;
+
+  if ( hpcd->Init.speed != PCD_SPEED_FULL)
+  {
+    Error_Handler();
+  }
+    /* Set Speed. */
+  USBD_LL_SetSpeed((USBD_HandleTypeDef*)hpcd->pData, speed);
+
+  /* Reset Device. */
+  USBD_LL_Reset((USBD_HandleTypeDef*)hpcd->pData);
+}
+
+/**
+  * @brief  Suspend callback.
+  * When Low power mode is enabled the debug cannot be used (IAR, Keil doesn't support it)
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_SuspendCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_SuspendCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  /* Inform USB library that core enters in suspend Mode. */
+  USBD_LL_Suspend((USBD_HandleTypeDef*)hpcd->pData);
+  /* Enter in STOP mode. */
+  /* USER CODE BEGIN 2 */
+  if (hpcd->Init.low_power_enable)
+  {
+    /* Set SLEEPDEEP bit and SleepOnExit of Cortex System Control Register. */
+    SCB->SCR |= (uint32_t)((uint32_t)(SCB_SCR_SLEEPDEEP_Msk | SCB_SCR_SLEEPONEXIT_Msk));
+  }
+  /* USER CODE END 2 */
+}
+
+/**
+  * @brief  Resume callback.
+  * When Low power mode is enabled the debug cannot be used (IAR, Keil doesn't support it)
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_ResumeCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_ResumeCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+
+  /* USER CODE BEGIN 3 */
+  if (hpcd->Init.low_power_enable)
+  {
+    /* Reset SLEEPDEEP bit of Cortex System Control Register. */
+    SCB->SCR &= (uint32_t)~((uint32_t)(SCB_SCR_SLEEPDEEP_Msk | SCB_SCR_SLEEPONEXIT_Msk));
+    SystemClockConfig_Resume();
+  }
+  /* USER CODE END 3 */
+  USBD_LL_Resume((USBD_HandleTypeDef*)hpcd->pData);
+}
+
+/**
+  * @brief  ISOOUTIncomplete callback.
+  * @param  hpcd: PCD handle
+  * @param  epnum: Endpoint number
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_ISOOUTIncompleteCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#else
+void HAL_PCD_ISOOUTIncompleteCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_IsoOUTIncomplete((USBD_HandleTypeDef*)hpcd->pData, epnum);
+}
+
+/**
+  * @brief  ISOINIncomplete callback.
+  * @param  hpcd: PCD handle
+  * @param  epnum: Endpoint number
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_ISOINIncompleteCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#else
+void HAL_PCD_ISOINIncompleteCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_IsoINIncomplete((USBD_HandleTypeDef*)hpcd->pData, epnum);
+}
+
+/**
+  * @brief  Connect callback.
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_ConnectCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_ConnectCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_DevConnected((USBD_HandleTypeDef*)hpcd->pData);
+}
+
+/**
+  * @brief  Disconnect callback.
+  * @param  hpcd: PCD handle
+  * @retval None
+  */
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+static void PCD_DisconnectCallback(PCD_HandleTypeDef *hpcd)
+#else
+void HAL_PCD_DisconnectCallback(PCD_HandleTypeDef *hpcd)
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+{
+  USBD_LL_DevDisconnected((USBD_HandleTypeDef*)hpcd->pData);
+}
+
+/*******************************************************************************
+                       LL Driver Interface (USB Device Library --> PCD)
+*******************************************************************************/
+
+/**
+  * @brief  Initializes the low level portion of the device driver.
+  * @param  pdev: Device handle
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_Init(USBD_HandleTypeDef *pdev)
+{
+  /* Init USB Ip. */
+  /* Enable USB power on Pwrctrl CR2 register. */
+  HAL_PWREx_EnableVddUSB();
+  /* Link the driver to the stack. */
+  hpcd_USB_FS.pData = pdev;
+  pdev->pData = &hpcd_USB_FS;
+
+  hpcd_USB_FS.Instance = USB;
+  hpcd_USB_FS.Init.dev_endpoints = 8;
+  hpcd_USB_FS.Init.speed = PCD_SPEED_FULL;
+  hpcd_USB_FS.Init.phy_itface = PCD_PHY_EMBEDDED;
+  hpcd_USB_FS.Init.Sof_enable = DISABLE;
+  hpcd_USB_FS.Init.low_power_enable = DISABLE;
+  hpcd_USB_FS.Init.lpm_enable = DISABLE;
+  hpcd_USB_FS.Init.battery_charging_enable = DISABLE;
+  if (HAL_PCD_Init(&hpcd_USB_FS) != HAL_OK)
+  {
+    Error_Handler( );
+  }
+
+#if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
+  /* Register USB PCD CallBacks */
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_SOF_CB_ID, PCD_SOFCallback);
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_SETUPSTAGE_CB_ID, PCD_SetupStageCallback);
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_RESET_CB_ID, PCD_ResetCallback);
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_SUSPEND_CB_ID, PCD_SuspendCallback);
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_RESUME_CB_ID, PCD_ResumeCallback);
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_CONNECT_CB_ID, PCD_ConnectCallback);
+  HAL_PCD_RegisterCallback(&hpcd_USB_FS, HAL_PCD_DISCONNECT_CB_ID, PCD_DisconnectCallback);
+
+  HAL_PCD_RegisterDataOutStageCallback(&hpcd_USB_FS, PCD_DataOutStageCallback);
+  HAL_PCD_RegisterDataInStageCallback(&hpcd_USB_FS, PCD_DataInStageCallback);
+  HAL_PCD_RegisterIsoOutIncpltCallback(&hpcd_USB_FS, PCD_ISOOUTIncompleteCallback);
+  HAL_PCD_RegisterIsoInIncpltCallback(&hpcd_USB_FS, PCD_ISOINIncompleteCallback);
+#endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
+  /* USER CODE BEGIN EndPoint_Configuration */
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x00 , PCD_SNG_BUF, 0x18);
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x80 , PCD_SNG_BUF, 0x58);
+  /* USER CODE END EndPoint_Configuration */
+  /* USER CODE BEGIN EndPoint_Configuration_CDC */
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x81 , PCD_SNG_BUF, 0xC0);
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x01 , PCD_SNG_BUF, 0x110);
+  HAL_PCDEx_PMAConfig((PCD_HandleTypeDef*)pdev->pData , 0x82 , PCD_SNG_BUF, 0x100);
+  /* USER CODE END EndPoint_Configuration_CDC */
+  return USBD_OK;
+}
+
+/**
+  * @brief  De-Initializes the low level portion of the device driver.
+  * @param  pdev: Device handle
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_DeInit(USBD_HandleTypeDef *pdev)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_DeInit(pdev->pData);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Starts the low level portion of the device driver.
+  * @param  pdev: Device handle
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_Start(USBD_HandleTypeDef *pdev)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_Start(pdev->pData);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Stops the low level portion of the device driver.
+  * @param  pdev: Device handle
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_Stop(USBD_HandleTypeDef *pdev)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_Stop(pdev->pData);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Opens an endpoint of the low level driver.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @param  ep_type: Endpoint type
+  * @param  ep_mps: Endpoint max packet size
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_OpenEP(USBD_HandleTypeDef *pdev, uint8_t ep_addr, uint8_t ep_type, uint16_t ep_mps)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_Open(pdev->pData, ep_addr, ep_mps, ep_type);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Closes an endpoint of the low level driver.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_CloseEP(USBD_HandleTypeDef *pdev, uint8_t ep_addr)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_Close(pdev->pData, ep_addr);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Flushes an endpoint of the Low Level Driver.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_FlushEP(USBD_HandleTypeDef *pdev, uint8_t ep_addr)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_Flush(pdev->pData, ep_addr);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Sets a Stall condition on an endpoint of the Low Level Driver.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_StallEP(USBD_HandleTypeDef *pdev, uint8_t ep_addr)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_SetStall(pdev->pData, ep_addr);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Clears a Stall condition on an endpoint of the Low Level Driver.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_ClearStallEP(USBD_HandleTypeDef *pdev, uint8_t ep_addr)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_ClrStall(pdev->pData, ep_addr);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Returns Stall condition.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @retval Stall (1: Yes, 0: No)
+  */
+uint8_t USBD_LL_IsStallEP(USBD_HandleTypeDef *pdev, uint8_t ep_addr)
+{
+  PCD_HandleTypeDef *hpcd = (PCD_HandleTypeDef*) pdev->pData;
+
+  if((ep_addr & 0x80) == 0x80)
+  {
+    return hpcd->IN_ep[ep_addr & 0x7F].is_stall;
+  }
+  else
+  {
+    return hpcd->OUT_ep[ep_addr & 0x7F].is_stall;
+  }
+}
+
+/**
+  * @brief  Assigns a USB address to the device.
+  * @param  pdev: Device handle
+  * @param  dev_addr: Device address
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_SetUSBAddress(USBD_HandleTypeDef *pdev, uint8_t dev_addr)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_SetAddress(pdev->pData, dev_addr);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Transmits data over an endpoint.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @param  pbuf: Pointer to data to be sent
+  * @param  size: Data size
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_Transmit(USBD_HandleTypeDef *pdev, uint8_t ep_addr, uint8_t *pbuf, uint32_t size)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_Transmit(pdev->pData, ep_addr, pbuf, size);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Prepares an endpoint for reception.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @param  pbuf: Pointer to data to be received
+  * @param  size: Data size
+  * @retval USBD status
+  */
+USBD_StatusTypeDef USBD_LL_PrepareReceive(USBD_HandleTypeDef *pdev, uint8_t ep_addr, uint8_t *pbuf, uint32_t size)
+{
+  HAL_StatusTypeDef hal_status = HAL_OK;
+  USBD_StatusTypeDef usb_status = USBD_OK;
+
+  hal_status = HAL_PCD_EP_Receive(pdev->pData, ep_addr, pbuf, size);
+
+  switch (hal_status) {
+    case HAL_OK :
+      usb_status = USBD_OK;
+    break;
+    case HAL_ERROR :
+      usb_status = USBD_FAIL;
+    break;
+    case HAL_BUSY :
+      usb_status = USBD_BUSY;
+    break;
+    case HAL_TIMEOUT :
+      usb_status = USBD_FAIL;
+    break;
+    default :
+      usb_status = USBD_FAIL;
+    break;
+  }
+  return usb_status;
+}
+
+/**
+  * @brief  Returns the last transfered packet size.
+  * @param  pdev: Device handle
+  * @param  ep_addr: Endpoint number
+  * @retval Recived Data Size
+  */
+uint32_t USBD_LL_GetRxDataSize(USBD_HandleTypeDef *pdev, uint8_t ep_addr)
+{
+  return HAL_PCD_EP_GetRxCount((PCD_HandleTypeDef*) pdev->pData, ep_addr);
+}
+
+/**
+  * @brief  Send LPM message to user layer
+  * @param  hpcd: PCD handle
+  * @param  msg: LPM message
+  * @retval None
+  */
+void HAL_PCDEx_LPM_Callback(PCD_HandleTypeDef *hpcd, PCD_LPM_MsgTypeDef msg)
+{
+  switch (msg)
+  {
+  case PCD_LPM_L0_ACTIVE:
+    if (hpcd->Init.low_power_enable)
+    {
+      SystemClockConfig_Resume();
+
+      /* Reset SLEEPDEEP bit of Cortex System Control Register. */
+      SCB->SCR &= (uint32_t)~((uint32_t)(SCB_SCR_SLEEPDEEP_Msk | SCB_SCR_SLEEPONEXIT_Msk));
+    }
+    USBD_LL_Resume(hpcd->pData);
+    break;
+
+  case PCD_LPM_L1_ACTIVE:
+    USBD_LL_Suspend(hpcd->pData);
+
+    /* Enter in STOP mode. */
+    if (hpcd->Init.low_power_enable)
+    {
+      /* Set SLEEPDEEP bit and SleepOnExit of Cortex System Control Register. */
+      SCB->SCR |= (uint32_t)((uint32_t)(SCB_SCR_SLEEPDEEP_Msk | SCB_SCR_SLEEPONEXIT_Msk));
+    }
+    break;
+  }
+}
+
+/**
+  * @brief  Delays routine for the USB Device Library.
+  * @param  Delay: Delay in ms
+  * @retval None
+  */
+void USBD_LL_Delay(uint32_t Delay)
+{
+  HAL_Delay(Delay);
+}
+
+/**
+  * @brief  Static single allocation.
+  * @param  size: Size of allocated memory
+  * @retval None
+  */
+void *USBD_static_malloc(uint32_t size)
+{
+  static uint32_t mem[(sizeof(USBD_CDC_HandleTypeDef)/4)+1];/* On 32-bit boundary */
+  return mem;
+}
+
+/**
+  * @brief  Dummy memory free
+  * @param  p: Pointer to allocated  memory address
+  * @retval None
+  */
+void USBD_static_free(void *p)
+{
+
+}
+
+/* USER CODE BEGIN 5 */
+/**
+  * @brief  Configures system clock after wake-up from USB resume callBack:
+  *         enable HSI, PLL and select PLL as system clock source.
+  * @retval None
+  */
+static void SystemClockConfig_Resume(void)
+{
+  SystemClock_Config();
+}
+/* USER CODE END 5 */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/cubemx/usbd_desc.c

@@ -0,0 +1,445 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : App/usbd_desc.c
+  * @version        : v2.0_Cube
+  * @brief          : This file implements the USB device descriptors.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under Ultimate Liberty license
+  * SLA0044, the "License"; You may not use this file except in compliance with
+  * the License. You may obtain a copy of the License at:
+  *                             www.st.com/SLA0044
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+/* Includes ------------------------------------------------------------------*/
+#include "usbd_core.h"
+#include "usbd_desc.h"
+#include "usbd_conf.h"
+
+/* USER CODE BEGIN INCLUDE */
+
+/* USER CODE END INCLUDE */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+
+/* USER CODE BEGIN PV */
+/* Private variables ---------------------------------------------------------*/
+
+/* USER CODE END PV */
+
+/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
+  * @{
+  */
+
+/** @addtogroup USBD_DESC
+  * @{
+  */
+
+/** @defgroup USBD_DESC_Private_TypesDefinitions USBD_DESC_Private_TypesDefinitions
+  * @brief Private types.
+  * @{
+  */
+
+/* USER CODE BEGIN PRIVATE_TYPES */
+
+/* USER CODE END PRIVATE_TYPES */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Private_Defines USBD_DESC_Private_Defines
+  * @brief Private defines.
+  * @{
+  */
+
+#define USBD_VID     1155
+#define USBD_LANGID_STRING     1033
+#define USBD_MANUFACTURER_STRING     "STMicroelectronics"
+#define USBD_PID_FS     22336
+#define USBD_PRODUCT_STRING_FS     "STM32 Virtual ComPort"
+#define USBD_CONFIGURATION_STRING_FS     "CDC Config"
+#define USBD_INTERFACE_STRING_FS     "CDC Interface"
+
+#define USB_SIZ_BOS_DESC            0x0C
+
+/* USER CODE BEGIN PRIVATE_DEFINES */
+
+/* USER CODE END PRIVATE_DEFINES */
+
+/**
+  * @}
+  */
+
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+/** @defgroup USBD_DESC_Private_Macros USBD_DESC_Private_Macros
+  * @brief Private macros.
+  * @{
+  */
+
+/* USER CODE BEGIN PRIVATE_MACRO */
+
+/* USER CODE END PRIVATE_MACRO */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Private_FunctionPrototypes USBD_DESC_Private_FunctionPrototypes
+  * @brief Private functions declaration.
+  * @{
+  */
+
+static void Get_SerialNum(void);
+static void IntToUnicode(uint32_t value, uint8_t * pbuf, uint8_t len);
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Private_FunctionPrototypes USBD_DESC_Private_FunctionPrototypes
+  * @brief Private functions declaration for FS.
+  * @{
+  */
+
+uint8_t * USBD_FS_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+uint8_t * USBD_FS_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+uint8_t * USBD_FS_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+uint8_t * USBD_FS_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+uint8_t * USBD_FS_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+uint8_t * USBD_FS_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+uint8_t * USBD_FS_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+#if (USBD_LPM_ENABLED == 1)
+uint8_t * USBD_FS_USR_BOSDescriptor(USBD_SpeedTypeDef speed, uint16_t *length);
+#endif /* (USBD_LPM_ENABLED == 1) */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Private_Variables USBD_DESC_Private_Variables
+  * @brief Private variables.
+  * @{
+  */
+
+USBD_DescriptorsTypeDef FS_Desc =
+{
+  USBD_FS_DeviceDescriptor
+, USBD_FS_LangIDStrDescriptor
+, USBD_FS_ManufacturerStrDescriptor
+, USBD_FS_ProductStrDescriptor
+, USBD_FS_SerialStrDescriptor
+, USBD_FS_ConfigStrDescriptor
+, USBD_FS_InterfaceStrDescriptor
+#if (USBD_LPM_ENABLED == 1)
+, USBD_FS_USR_BOSDescriptor
+#endif /* (USBD_LPM_ENABLED == 1) */
+};
+
+#if defined ( __ICCARM__ ) /* IAR Compiler */
+  #pragma data_alignment=4
+#endif /* defined ( __ICCARM__ ) */
+/** USB standard device descriptor. */
+__ALIGN_BEGIN uint8_t USBD_FS_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END =
+{
+  0x12,                       /*bLength */
+  USB_DESC_TYPE_DEVICE,       /*bDescriptorType*/
+#if (USBD_LPM_ENABLED == 1)
+  0x01,                       /*bcdUSB */ /* changed to USB version 2.01
+                                             in order to support LPM L1 suspend
+                                             resume test of USBCV3.0*/
+#else
+  0x00,                       /*bcdUSB */
+#endif /* (USBD_LPM_ENABLED == 1) */
+  0x02,
+  0x02,                       /*bDeviceClass*/
+  0x02,                       /*bDeviceSubClass*/
+  0x00,                       /*bDeviceProtocol*/
+  USB_MAX_EP0_SIZE,           /*bMaxPacketSize*/
+  LOBYTE(USBD_VID),           /*idVendor*/
+  HIBYTE(USBD_VID),           /*idVendor*/
+  LOBYTE(USBD_PID_FS),        /*idProduct*/
+  HIBYTE(USBD_PID_FS),        /*idProduct*/
+  0x00,                       /*bcdDevice rel. 2.00*/
+  0x02,
+  USBD_IDX_MFC_STR,           /*Index of manufacturer  string*/
+  USBD_IDX_PRODUCT_STR,       /*Index of product string*/
+  USBD_IDX_SERIAL_STR,        /*Index of serial number string*/
+  USBD_MAX_NUM_CONFIGURATION  /*bNumConfigurations*/
+};
+
+/* USB_DeviceDescriptor */
+/** BOS descriptor. */
+#if (USBD_LPM_ENABLED == 1)
+#if defined ( __ICCARM__ ) /* IAR Compiler */
+  #pragma data_alignment=4
+#endif /* defined ( __ICCARM__ ) */
+__ALIGN_BEGIN uint8_t USBD_FS_BOSDesc[USB_SIZ_BOS_DESC] __ALIGN_END =
+{
+  0x5,
+  USB_DESC_TYPE_BOS,
+  0xC,
+  0x0,
+  0x1,  /* 1 device capability*/
+        /* device capability*/
+  0x7,
+  USB_DEVICE_CAPABITY_TYPE,
+  0x2,
+  0x2,  /* LPM capability bit set*/
+  0x0,
+  0x0,
+  0x0
+};
+#endif /* (USBD_LPM_ENABLED == 1) */
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Private_Variables USBD_DESC_Private_Variables
+  * @brief Private variables.
+  * @{
+  */
+
+#if defined ( __ICCARM__ ) /* IAR Compiler */
+  #pragma data_alignment=4
+#endif /* defined ( __ICCARM__ ) */
+
+/** USB lang indentifier descriptor. */
+__ALIGN_BEGIN uint8_t USBD_LangIDDesc[USB_LEN_LANGID_STR_DESC] __ALIGN_END =
+{
+     USB_LEN_LANGID_STR_DESC,
+     USB_DESC_TYPE_STRING,
+     LOBYTE(USBD_LANGID_STRING),
+     HIBYTE(USBD_LANGID_STRING)
+};
+
+#if defined ( __ICCARM__ ) /* IAR Compiler */
+  #pragma data_alignment=4
+#endif /* defined ( __ICCARM__ ) */
+/* Internal string descriptor. */
+__ALIGN_BEGIN uint8_t USBD_StrDesc[USBD_MAX_STR_DESC_SIZ] __ALIGN_END;
+
+#if defined ( __ICCARM__ ) /*!< IAR Compiler */
+  #pragma data_alignment=4
+#endif
+__ALIGN_BEGIN uint8_t USBD_StringSerial[USB_SIZ_STRING_SERIAL] __ALIGN_END = {
+  USB_SIZ_STRING_SERIAL,
+  USB_DESC_TYPE_STRING,
+};
+
+/**
+  * @}
+  */
+
+/** @defgroup USBD_DESC_Private_Functions USBD_DESC_Private_Functions
+  * @brief Private functions.
+  * @{
+  */
+
+/**
+  * @brief  Return the device descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  UNUSED(speed);
+  *length = sizeof(USBD_FS_DeviceDesc);
+  return USBD_FS_DeviceDesc;
+}
+
+/**
+  * @brief  Return the LangID string descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  UNUSED(speed);
+  *length = sizeof(USBD_LangIDDesc);
+  return USBD_LangIDDesc;
+}
+
+/**
+  * @brief  Return the product string descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  if(speed == 0)
+  {
+    USBD_GetString((uint8_t *)USBD_PRODUCT_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString((uint8_t *)USBD_PRODUCT_STRING_FS, USBD_StrDesc, length);
+  }
+  return USBD_StrDesc;
+}
+
+/**
+  * @brief  Return the manufacturer string descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  UNUSED(speed);
+  USBD_GetString((uint8_t *)USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
+  return USBD_StrDesc;
+}
+
+/**
+  * @brief  Return the serial number string descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  UNUSED(speed);
+  *length = USB_SIZ_STRING_SERIAL;
+
+  /* Update the serial number string descriptor with the data from the unique
+   * ID */
+  Get_SerialNum();
+  /* USER CODE BEGIN USBD_FS_SerialStrDescriptor */
+
+  /* USER CODE END USBD_FS_SerialStrDescriptor */
+  return (uint8_t *) USBD_StringSerial;
+}
+
+/**
+  * @brief  Return the configuration string descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_ConfigStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  if(speed == USBD_SPEED_HIGH)
+  {
+    USBD_GetString((uint8_t *)USBD_CONFIGURATION_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString((uint8_t *)USBD_CONFIGURATION_STRING_FS, USBD_StrDesc, length);
+  }
+  return USBD_StrDesc;
+}
+
+/**
+  * @brief  Return the interface string descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_InterfaceStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  if(speed == 0)
+  {
+    USBD_GetString((uint8_t *)USBD_INTERFACE_STRING_FS, USBD_StrDesc, length);
+  }
+  else
+  {
+    USBD_GetString((uint8_t *)USBD_INTERFACE_STRING_FS, USBD_StrDesc, length);
+  }
+  return USBD_StrDesc;
+}
+
+#if (USBD_LPM_ENABLED == 1)
+/**
+  * @brief  Return the BOS descriptor
+  * @param  speed : Current device speed
+  * @param  length : Pointer to data length variable
+  * @retval Pointer to descriptor buffer
+  */
+uint8_t * USBD_FS_USR_BOSDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
+{
+  UNUSED(speed);
+  *length = sizeof(USBD_FS_BOSDesc);
+  return (uint8_t*)USBD_FS_BOSDesc;
+}
+#endif /* (USBD_LPM_ENABLED == 1) */
+
+/**
+  * @brief  Create the serial number string descriptor
+  * @param  None
+  * @retval None
+  */
+static void Get_SerialNum(void)
+{
+  uint32_t deviceserial0, deviceserial1, deviceserial2;
+
+  deviceserial0 = *(uint32_t *) DEVICE_ID1;
+  deviceserial1 = *(uint32_t *) DEVICE_ID2;
+  deviceserial2 = *(uint32_t *) DEVICE_ID3;
+
+  deviceserial0 += deviceserial2;
+
+  if (deviceserial0 != 0)
+  {
+    IntToUnicode(deviceserial0, &USBD_StringSerial[2], 8);
+    IntToUnicode(deviceserial1, &USBD_StringSerial[18], 4);
+  }
+}
+
+/**
+  * @brief  Convert Hex 32Bits value into char
+  * @param  value: value to convert
+  * @param  pbuf: pointer to the buffer
+  * @param  len: buffer length
+  * @retval None
+  */
+static void IntToUnicode(uint32_t value, uint8_t * pbuf, uint8_t len)
+{
+  uint8_t idx = 0;
+
+  for (idx = 0; idx < len; idx++)
+  {
+    if (((value >> 28)) < 0xA)
+    {
+      pbuf[2 * idx] = (value >> 28) + '0';
+    }
+    else
+    {
+      pbuf[2 * idx] = (value >> 28) + 'A' - 10;
+    }
+
+    value = value << 4;
+
+    pbuf[2 * idx + 1] = 0;
+  }
+}
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

interface2/firmware/src/debug.cpp

@@ -0,0 +1,142 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include <cstdio>
+#include <cstdarg>
+
+#include "stm32l4xx_hal.h"
+
+#include "pins.h"
+
+#include "debug.h"
+
+UART_HandleTypeDef huart1;
+
+bool Debug::init()
+{
+    // Configure UART.
+    huart1.Instance = USART1;
+
+    huart1.Init.BaudRate = 115200;
+    huart1.Init.WordLength = UART_WORDLENGTH_8B;
+    huart1.Init.StopBits = UART_STOPBITS_1;
+    huart1.Init.Parity = UART_PARITY_NONE;
+    huart1.Init.Mode = UART_MODE_TX_RX;
+    huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart1.Init.OverSampling = UART_OVERSAMPLING_16;
+    huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
+
+    huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+
+    if (HAL_UART_Init(&huart1) != HAL_OK) {
+        return false;
+    }
+
+    // Configure GPIO.
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+
+    HAL_GPIO_WritePin(GPIOB, GPIO0_Pin | GPIO1_Pin, GPIO_PIN_RESET);
+
+    GPIO_InitTypeDef gpioInit = { 0 };
+
+    gpioInit.Pin = GPIO0_Pin | GPIO1_Pin;
+    gpioInit.Mode = GPIO_MODE_OUTPUT_PP;
+    gpioInit.Pull = GPIO_NOPULL;
+    gpioInit.Speed = GPIO_SPEED_FREQ_LOW;
+
+    HAL_GPIO_Init(GPIOB, &gpioInit);
+
+    // Set initial GPIO state.
+    HAL_GPIO_WritePin(GPIOB, GPIO0_Pin | GPIO1_Pin, GPIO_PIN_RESET);
+
+    return true;
+}
+
+void Debug::banner()
+{
+    printf("\r\n");
+    printf("****** Coax\r\n");
+    printf("  **** Build " FIRMWARE_BUILD_WHAT " by " FIRMWARE_BUILD_WHO " on " FIRMWARE_BUILD_WHEN "\r\n");
+    printf("    **\r\n");
+}
+
+void Debug::setMarker(int marker)
+{
+    if (marker == 0) {
+        HAL_GPIO_WritePin(GPIOB, GPIO0_Pin, GPIO_PIN_SET);
+    } else if (marker == 1) {
+        HAL_GPIO_WritePin(GPIOB, GPIO1_Pin, GPIO_PIN_SET);
+    }
+}
+
+void Debug::resetMarker(int marker)
+{
+    if (marker == 0) {
+        HAL_GPIO_WritePin(GPIOB, GPIO0_Pin, GPIO_PIN_RESET);
+    } else if (marker == 1) {
+        HAL_GPIO_WritePin(GPIOB, GPIO1_Pin, GPIO_PIN_RESET);
+    }
+}
+
+void Debug::trap(int number)
+{
+    printf("%lu TRAP[%d]\r\n", HAL_GetTick(), number);
+}
+
+void Debug::trap(int number, const char *format, ...)
+{
+    printf("%lu TRAP[%d] ", HAL_GetTick(), number);
+
+    va_list args;
+
+    va_start(args, format);
+    vprintf(format, args);
+    va_end(args);
+
+    printf("\r\n");
+}
+
+extern "C" void HAL_UART_MspInit(UART_HandleTypeDef *uartHandle)
+{
+    GPIO_InitTypeDef gpioInit = { 0 };
+
+    if (uartHandle->Instance == USART1) {
+        __HAL_RCC_USART1_CLK_ENABLE();
+        __HAL_RCC_GPIOA_CLK_ENABLE();
+
+        gpioInit.Pin = GPIO_PIN_9 | GPIO_PIN_10;
+        gpioInit.Mode = GPIO_MODE_AF_PP;
+        gpioInit.Pull = GPIO_NOPULL;
+        gpioInit.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+        gpioInit.Alternate = GPIO_AF7_USART1;
+
+        HAL_GPIO_Init(GPIOA, &gpioInit);
+    }
+}
+
+extern "C" void HAL_UART_MspDeInit(UART_HandleTypeDef *uartHandle)
+{
+    if (uartHandle->Instance == USART1) {
+        __HAL_RCC_USART1_CLK_DISABLE();
+
+        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9 | GPIO_PIN_10);
+    }
+}
+
+extern "C" int _write(int file, char *ptr, int len)
+{
+    HAL_UART_Transmit(&huart1, reinterpret_cast<uint8_t *>(ptr), len, 100);
+
+    return len;
+}

interface2/firmware/src/ice40.cpp

@@ -0,0 +1,113 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include "pins.h"
+
+#include "ice40.h"
+
+ICE40::ICE40()
+{
+    _isConfigured = false;
+}
+
+inline void clock()
+{
+    LL_GPIO_ResetOutputPin(ICE40_SCK_GPIO_Port, ICE40_SCK_Pin);
+
+    for (int index = 0; index < 4; index++) {
+        asm volatile("nop\n\t");
+    }
+
+    LL_GPIO_SetOutputPin(ICE40_SCK_GPIO_Port, ICE40_SCK_Pin);
+}
+
+bool ICE40::configure(const uint8_t *bitstream, size_t bitstreamCount)
+{
+    _isConfigured = false;
+
+    // Configure GPIO.
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+
+    HAL_GPIO_WritePin(GPIOA, ICE40_CS_Pin | ICE40_SCK_Pin | ICE40_SDI_Pin, GPIO_PIN_RESET);
+    HAL_GPIO_WritePin(GPIOB, ICE40_CRESET_Pin, GPIO_PIN_RESET);
+
+    GPIO_InitTypeDef gpioInit = { 0 };
+
+    gpioInit.Pin = ICE40_CS_Pin | ICE40_SCK_Pin | ICE40_SDI_Pin;
+    gpioInit.Mode = GPIO_MODE_OUTPUT_PP;
+    gpioInit.Pull = GPIO_NOPULL;
+    gpioInit.Speed = GPIO_SPEED_FREQ_LOW;
+
+    HAL_GPIO_Init(GPIOA, &gpioInit);
+
+    gpioInit.Pin = ICE40_CRESET_Pin;
+    gpioInit.Mode = GPIO_MODE_OUTPUT_PP;
+    gpioInit.Pull = GPIO_NOPULL;
+    gpioInit.Speed = GPIO_SPEED_FREQ_LOW;
+
+    HAL_GPIO_Init(GPIOB, &gpioInit);
+
+    gpioInit.Pin = ICE40_CDONE_Pin;
+    gpioInit.Mode = GPIO_MODE_INPUT;
+    gpioInit.Pull = GPIO_NOPULL;
+
+    HAL_GPIO_Init(GPIOB, &gpioInit);
+
+    // Set initial GPIO state.
+    HAL_GPIO_WritePin(ICE40_CS_GPIO_Port, ICE40_CS_Pin | ICE40_SCK_Pin, GPIO_PIN_SET);
+    HAL_GPIO_WritePin(ICE40_CRESET_GPIO_Port, ICE40_CRESET_Pin, GPIO_PIN_SET);
+
+    // Assert CS and reset.
+    HAL_GPIO_WritePin(ICE40_CS_GPIO_Port, ICE40_CS_Pin, GPIO_PIN_RESET);
+
+    HAL_GPIO_WritePin(ICE40_CRESET_GPIO_Port, ICE40_CRESET_Pin, GPIO_PIN_RESET);
+
+    HAL_Delay(1);
+
+    HAL_GPIO_WritePin(ICE40_CRESET_GPIO_Port, ICE40_CRESET_Pin, GPIO_PIN_SET);
+
+    HAL_Delay(1);
+
+    // Send the bitstream.
+    for (size_t index = 0; index < bitstreamCount; index++) {
+        uint8_t byte = bitstream[index];
+
+        for (int bitIndex = 7; bitIndex >= 0; bitIndex--) {
+            if ((byte >> bitIndex) & 0x01) {
+                LL_GPIO_SetOutputPin(ICE40_SDI_GPIO_Port, ICE40_SDI_Pin);
+            } else {
+                LL_GPIO_ResetOutputPin(ICE40_SDI_GPIO_Port, ICE40_SDI_Pin);
+            }
+
+            clock();
+        }
+    }
+
+    // Check done.
+    bool done = LL_GPIO_IsInputPinSet(ICE40_CDONE_GPIO_Port, ICE40_CDONE_Pin);
+
+    if (done) {
+        for (int index = 0; index < 49; index++) {
+            clock();
+        }
+    }
+
+    // Deassert CS.
+    HAL_GPIO_WritePin(ICE40_CS_GPIO_Port, ICE40_CS_Pin, GPIO_PIN_SET);
+
+    _isConfigured = done;
+
+    return _isConfigured;
+}

interface2/firmware/src/indicators.cpp

@@ -0,0 +1,113 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include "pins.h"
+
+#include "indicators.h"
+
+#define LED_GPIO_Port GPIOB
+
+Indicators::Indicators()
+{
+    _status = INDICATORS_STATUS_UNKNOWN;
+
+    _txState = 0;
+    _rxState = 0;
+    _errorState = 0;
+}
+
+void Indicators::init()
+{
+    // Configure GPIO.
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+
+    HAL_GPIO_WritePin(LED_GPIO_Port, LED_STATUS_Pin | LED_TX_Pin | LED_RX_Pin | LED_ERROR_Pin, GPIO_PIN_RESET);
+
+    GPIO_InitTypeDef gpioInit = { 0 };
+
+    gpioInit.Pin = LED_STATUS_Pin | LED_TX_Pin | LED_RX_Pin | LED_ERROR_Pin;
+    gpioInit.Mode = GPIO_MODE_OUTPUT_PP;
+    gpioInit.Pull = GPIO_NOPULL;
+    gpioInit.Speed = GPIO_SPEED_FREQ_LOW;
+
+    HAL_GPIO_Init(LED_GPIO_Port, &gpioInit);
+
+    // Set initial GPIO state.
+    HAL_GPIO_WritePin(LED_GPIO_Port, LED_STATUS_Pin | LED_TX_Pin | LED_RX_Pin | LED_ERROR_Pin, GPIO_PIN_SET);
+}
+
+void Indicators::setStatus(IndicatorsStatus status)
+{
+    _status = status;
+
+    if (_status == INDICATORS_STATUS_CONFIGURING) {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_STATUS_Pin, GPIO_PIN_SET);
+
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_TX_Pin | LED_RX_Pin | LED_ERROR_Pin, GPIO_PIN_RESET);
+    } else if (_status == INDICATORS_STATUS_RUNNING) {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_STATUS_Pin, GPIO_PIN_SET);
+    }
+}
+
+void Indicators::tx()
+{
+    if (_txState == 0) {
+        _txState = 2;
+    }
+}
+
+void Indicators::rx()
+{
+    if (_rxState == 0) {
+        _rxState = 2;
+    }
+}
+
+void Indicators::error()
+{
+    if (_errorState == 0) {
+        _errorState = 2;
+    }
+}
+
+void Indicators::update()
+{
+    if (_status == INDICATORS_STATUS_CONFIGURING) {
+        HAL_GPIO_TogglePin(LED_GPIO_Port, LED_STATUS_Pin);
+    }
+
+    if (_txState > 0) {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_TX_Pin, _txState == 2 ? GPIO_PIN_SET : GPIO_PIN_RESET);
+
+        _txState--;
+    } else {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_TX_Pin, GPIO_PIN_RESET);
+    }
+
+    if (_rxState > 0) {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_RX_Pin, _rxState == 2 ? GPIO_PIN_SET : GPIO_PIN_RESET);
+
+        _rxState--;
+    } else {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_RX_Pin, GPIO_PIN_RESET);
+    }
+
+    if (_errorState > 0) {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_ERROR_Pin, _errorState == 2 ? GPIO_PIN_SET : GPIO_PIN_RESET);
+
+        _errorState--;
+    } else {
+        HAL_GPIO_WritePin(LED_GPIO_Port, LED_ERROR_Pin, GPIO_PIN_RESET);
+    }
+}

interface2/firmware/src/interface.cpp

@@ -0,0 +1,279 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include <cstdio>
+#include <cstring>
+
+#include <machine/endian.h>
+
+#include "stm32l4xx_hal.h"
+
+#include "config.h"
+#include "coax.h"
+#include "indicators.h"
+#include "message.h"
+#include "debug.h"
+#include "version.h"
+
+#include "interface.h"
+
+void sendErrorMessage(uint8_t code, const char *description)
+{
+    uint8_t message[2 + 62 + 1] = { 0x02, code };
+    size_t count = 2;
+
+    if (description != NULL) {
+        strncpy(reinterpret_cast<char *>(message + 2), description, 62);
+
+        count += strlen(description);
+    }
+
+    MessageSender::send(message, count);
+}
+
+Interface::Interface(Coax &coax, Indicators &indicators) :
+    _coax(coax),
+    _indicators(indicators)
+{
+}
+
+void Interface::handleMessage(uint8_t *buffer, size_t bufferCount)
+{
+    if (bufferCount < 4) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_MESSAGE_BUFFER_COUNT_4");
+        return;
+    }
+
+    size_t count = (buffer[0] << 8) | buffer[1];
+
+    if (bufferCount - 4 != count) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_MESSAGE_BUFFER_COUNT_MISMATCH");
+        return;
+    }
+
+    if (count < 1) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_COMMAND_BUFFER_COUNT_1");
+        return;
+    }
+
+    uint8_t command = buffer[2];
+
+    if (command == COMMAND_RESET) {
+        handleReset(buffer + 3, count - 1);
+    } else if (command == COMMAND_TRANSMIT_RECEIVE) {
+        Debug::setMarker(0);
+        handleTransmitReceive(buffer + 3, count - 1);
+        Debug::resetMarker(0);
+    } else if (command == COMMAND_INFO) {
+        handleInfo(buffer + 3, count - 1);
+    } else if (command == COMMAND_TEST) {
+        handleTest(buffer + 3, count - 1);
+    } else if (command == COMMAND_DFU) {
+        handleDFU(buffer + 3, count - 1);
+    } else {
+        sendErrorMessage(ERROR_UNKNOWN_COMMAND, NULL);
+    }
+}
+
+void Interface::handleError(MessageReceiverError error)
+{
+    if (error == MESSAGE_RECEIVER_ERROR_TIMEOUT) {
+        sendErrorMessage(ERROR_MESSAGE_TIMEOUT, NULL);
+    } else {
+        Debug::trap(401, "error = %d", error);
+    }
+}
+
+void Interface::handleReset(uint8_t *buffer, size_t bufferCount)
+{
+    _coax.reset();
+
+    uint8_t response[] = { 0x01, 0x32, 0x70 };
+
+    MessageSender::send(response, 3);
+}
+
+void Interface::handleTransmitReceive(uint8_t *buffer, size_t bufferCount)
+{
+    if (bufferCount < 6) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_TXRX_BUFFER_COUNT_6");
+        return;
+    }
+
+    uint16_t *transmitBuffer = reinterpret_cast<uint16_t *>(buffer + 2);
+    uint16_t transmitBufferCount = (bufferCount - 6) / 2;
+
+    uint16_t transmitRepeatCount = ((buffer[0] << 8) | buffer[1]) & 0x7fff;
+    uint16_t transmitRepeatOffset = buffer[0] >> 7;
+
+    uint16_t receiveBufferSize = (buffer[bufferCount - 4] << 8) | buffer[bufferCount - 3];
+    uint16_t receiveTimeout = (buffer[bufferCount - 2] << 8) | buffer[bufferCount - 1];
+
+    if (transmitBufferCount < 1) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_TXRX_TX_BUFFER_COUNT_1");
+        return;
+    }
+
+    // Expand the provided data if applicable.
+    if (transmitRepeatCount > 1) {
+        uint8_t *source = reinterpret_cast<uint8_t *>(transmitBuffer) + (transmitRepeatOffset * 2);
+        uint8_t *destination = reinterpret_cast<uint8_t *>(transmitBuffer) + (transmitBufferCount * 2);
+
+        uint16_t sourceCount = transmitBufferCount - transmitRepeatOffset;
+
+        size_t length = sourceCount * 2;
+
+        for (int index = 1; index < transmitRepeatCount; index++) {
+            memcpy(destination, source, length);
+
+            transmitBufferCount += sourceCount;
+
+            destination += length;
+        }
+    }
+
+    int transmitCount = _coax.transmit(transmitBuffer, transmitBufferCount);
+
+    if (transmitCount < 0) {
+        Debug::trap(402, "error = %d", transmitCount);
+
+        _indicators.error();
+
+        // Convert the error to legacy interface error for compatability.
+        if (transmitCount == COAX_ERROR_TX_RECEIVER_ACTIVE) {
+            sendErrorMessage(101, NULL);
+        } else {
+            sendErrorMessage(105, NULL);
+        }
+
+        return;
+    }
+
+    _indicators.tx();
+
+    uint16_t *receiveBuffer = reinterpret_cast<uint16_t *>(buffer + 2);
+
+    int receiveCount = _coax.receive(receiveBuffer, receiveBufferSize, receiveTimeout);
+
+    if (receiveCount < 0) {
+        Debug::trap(403, "error = %d", receiveCount);
+
+        _indicators.error();
+
+        // Convert the error to legacy interface error for compatability.
+        if (receiveCount == COAX_ERROR_RX_LOSS_OF_MID_BIT_TRANSITION) {
+            sendErrorMessage(104, "Loss of mid bit transition");
+        } else if (receiveCount == COAX_ERROR_RX_PARITY) {
+            sendErrorMessage(104, "Parity error");
+        } else if (receiveCount == COAX_ERROR_RX_INVALID_END_SEQUENCE) {
+            sendErrorMessage(104, "Invalid end sequence");
+        } else {
+            sendErrorMessage(104, NULL);
+        }
+
+        return;
+    }
+
+    // Convert timeout to legacy interface error for compatability.
+    if (receiveCount == 0) {
+        sendErrorMessage(102, NULL);
+        return;
+    }
+
+    _indicators.rx();
+
+    // Send the response message.
+    buffer[1] = 0x01;
+
+    MessageSender::send(buffer + 1, 1 + (receiveCount * 2));
+}
+
+void Interface::handleInfo(uint8_t *buffer, size_t bufferCount)
+{
+    if (bufferCount < 1) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_INFO_BUFFER_COUNT_1");
+        return;
+    }
+
+    uint8_t query = buffer[0];
+
+    if (query == INFO_SUPPORTED_QUERIES) {
+        buffer[0] = 0x01;
+        buffer[1] = INFO_SUPPORTED_QUERIES;
+        buffer[2] = INFO_HARDWARE_TYPE;
+        buffer[3] = INFO_FIRMWARE_VERSION;
+        buffer[4] = INFO_MESSAGE_BUFFER_SIZE;
+
+        MessageSender::send(buffer, 5);
+    } else if (query == INFO_HARDWARE_TYPE) {
+        buffer[0] = 0x01;
+
+        int length = snprintf(reinterpret_cast<char *>(buffer + 1), 64, "interface2");
+
+        MessageSender::send(buffer, length + 1);
+    } else if (query == INFO_FIRMWARE_VERSION) {
+        buffer[0] = 0x01;
+
+        int length = snprintf(reinterpret_cast<char *>(buffer + 1), 64,
+                "%d.%d.%d (build %s)", VERSION_MAJOR, VERSION_MINOR, VERSION_PATCH,
+                FIRMWARE_BUILD_WHAT);
+
+        MessageSender::send(buffer, length + 1);
+    } else if (query == INFO_MESSAGE_BUFFER_SIZE) {
+        buffer[0] = 0x01;
+
+        uint32_t size = __htonl(MESSAGE_BUFFER_SIZE);
+
+        memcpy(buffer + 1, &size, sizeof(uint32_t));
+
+        MessageSender::send(buffer, 5);
+    } else {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_INFO_UNKNOWN_QUERY");
+        return;
+    }
+}
+
+void Interface::handleTest(uint8_t *buffer, size_t bufferCount)
+{
+    if (bufferCount < 1) {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_TEST_BUFFER_COUNT_1");
+        return;
+    }
+
+    uint8_t test = buffer[0];
+
+    if (test == TEST_SUPPORTED_TESTS) {
+        buffer[0] = 0x01;
+        buffer[1] = TEST_SUPPORTED_TESTS;
+
+        MessageSender::send(buffer, 2);
+    } else {
+        sendErrorMessage(ERROR_INVALID_MESSAGE, "HANDLE_TEST_UNKNOWN_TEST");
+        return;
+    }
+}
+
+extern void resetToBootloader();
+
+void Interface::handleDFU(uint8_t *buffer, size_t bufferCount)
+{
+    buffer[0] = 0x01;
+
+    MessageSender::send(buffer, 1);
+
+    // Wait before resetting to allow the response to be sent.
+    HAL_Delay(1000);
+
+    resetToBootloader();
+}

interface2/firmware/src/main.cpp

@@ -0,0 +1,209 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include <cstdio>
+#include <cstdint>
+#include <cstddef>
+
+#include "tim.h"
+#include "usb_device.h"
+
+#include "pins.h"
+#include "config.h"
+#include "indicators.h"
+#include "ice40.h"
+#include "coax.h"
+#include "message.h"
+#include "interface.h"
+#include "debug.h"
+
+void handleMessage(const uint8_t *, size_t);
+void handleMessageReceiverError(MessageReceiverError);
+
+extern "C" void SystemClock_Config();
+
+Indicators indicators;
+
+const uint8_t ice40Bitstream[] = {
+#include "bitstream.inc"
+};
+
+ICE40 ice40;
+
+SPICoaxTransceiver spiCoaxTransceiver;
+
+volatile uint16_t coaxBuffer[COAX_BUFFER_SIZE];
+
+Coax coax(spiCoaxTransceiver, CoaxParity::Even, coaxBuffer, COAX_BUFFER_SIZE);
+
+volatile uint8_t messageBuffer[MESSAGE_BUFFER_SIZE];
+
+MessageReceiver messageReceiver(messageBuffer, MESSAGE_BUFFER_SIZE, handleMessage,
+        handleMessageReceiverError);
+
+Interface interface(coax, indicators);
+
+int main(void)
+{
+    HAL_Init();
+
+    SystemClock_Config();
+
+    // Initialize the debug UART and GPIO devices.
+    Debug::init();
+
+    Debug::banner();
+
+    // Initialize the USB CDC device.
+    printf("\r\nInitializing USB CDC device...");
+
+    MX_USB_DEVICE_Init();
+
+    printf(" done.\r\n");
+
+    // Initialize the indicators.
+    MX_TIM6_Init();
+
+    indicators.init();
+
+    HAL_Delay(500);
+
+    HAL_TIM_Base_Start_IT(&htim6);
+
+    indicators.setStatus(INDICATORS_STATUS_CONFIGURING);
+
+    // Configure the iCE40 FPGA.
+    printf("Configuring iCE40 FPGA...");
+
+    while (!ice40.configure(ice40Bitstream, sizeof(ice40Bitstream))) {
+        indicators.error();
+
+        HAL_Delay(1000);
+    }
+
+    printf(" done.\r\n");
+
+    // Initialize the coax module.
+    printf("Initializing coax module...");
+
+    while (!coax.init()) {
+        indicators.error();
+
+        HAL_Delay(1000);
+    }
+
+    printf(" done.\r\n");
+
+    HAL_Delay(500);
+
+    indicators.setStatus(INDICATORS_STATUS_RUNNING);
+
+    printf("\r\nREADY.\r\n");
+
+    while (true) {
+        messageReceiver.dispatch();
+    }
+}
+
+extern "C" void handleMessageData(const uint8_t *buffer, size_t bufferCount)
+{
+    messageReceiver.load(buffer, bufferCount);
+}
+
+void handleMessage(const uint8_t *buffer, size_t bufferCount)
+{
+    interface.handleMessage(const_cast<uint8_t *>(buffer), bufferCount);
+}
+
+void handleMessageReceiverError(MessageReceiverError error)
+{
+    interface.handleError(error);
+}
+
+void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
+{
+    if (htim->Instance == htim6.Instance) {
+        indicators.update();
+    }
+}
+
+void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
+{
+    if (GPIO_Pin == COAX_IRQ_Pin) {
+        coax.handleInterrupt();
+    }
+}
+
+void SystemClock_Config(void)
+{
+    LL_FLASH_SetLatency(LL_FLASH_LATENCY_4);
+
+    while (LL_FLASH_GetLatency() != LL_FLASH_LATENCY_4) {
+    }
+
+    LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
+
+    LL_RCC_MSI_Enable();
+
+    while (LL_RCC_MSI_IsReady() != 1) {
+    }
+
+    LL_RCC_MSI_EnableRangeSelection();
+    LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_6);
+    LL_RCC_MSI_SetCalibTrimming(0);
+
+    LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 40, LL_RCC_PLLR_DIV_2);
+    LL_RCC_PLL_EnableDomain_SYS();
+    LL_RCC_PLL_Enable();
+
+    while (LL_RCC_PLL_IsReady() != 1) {
+    }
+
+    LL_RCC_PLLSAI1_ConfigDomain_48M(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 24, LL_RCC_PLLSAI1Q_DIV_2);
+    LL_RCC_PLLSAI1_EnableDomain_48M();
+    LL_RCC_PLLSAI1_Enable();
+
+    while (LL_RCC_PLLSAI1_IsReady() != 1) {
+    }
+
+    LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
+
+    while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL) {
+    }
+
+    LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
+    LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
+    LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
+    LL_SetSystemCoreClock(80000000);
+
+    if (HAL_InitTick(TICK_INT_PRIORITY) != HAL_OK) {
+        Error_Handler();
+    }
+
+    LL_RCC_SetUSARTClockSource(LL_RCC_USART1_CLKSOURCE_PCLK2);
+    LL_RCC_SetUSBClockSource(LL_RCC_USB_CLKSOURCE_PLLSAI1);
+}
+
+void Error_Handler(void)
+{
+}
+
+uint32_t bootMagic = 0x00000000;
+
+void resetToBootloader()
+{
+    bootMagic = 0x32703270;
+
+    NVIC_SystemReset();
+}

interface2/firmware/src/message.cpp

@@ -0,0 +1,258 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+#include "stm32l4xx_hal.h"
+
+#include "usbd_cdc_if.h"
+
+#include "debug.h"
+
+#include "message.h"
+
+#define MESSAGE_END 0xc0
+#define MESSAGE_ESCAPE 0xdb
+#define MESSAGE_ESCAPE_END 0xdc
+#define MESSAGE_ESCAPE_ESCAPE 0xdd
+
+MessageReceiver::MessageReceiver(volatile uint8_t *buffer, size_t bufferSize,
+        void (*messageCallback)(const uint8_t *, size_t),
+        void (*errorCallback)(MessageReceiverError)) :
+    _buffer(buffer),
+    _bufferSize(bufferSize),
+    _messageCallback(messageCallback),
+    _errorCallback(errorCallback)
+{
+    _timeout = 1000;
+    _lastReceiveTime = -1;
+
+    _bufferCount = 0;
+    _state = MESSAGE_RECEIVER_STATE_WAIT_START;
+}
+
+void MessageReceiver::load(const uint8_t *buffer, size_t bufferCount)
+{
+    _lastReceiveTime = HAL_GetTick();
+
+    for (size_t index = 0; index < bufferCount; index++) {
+        uint8_t byte = buffer[index];
+
+        if (_state == MESSAGE_RECEIVER_STATE_WAIT_START) {
+            if (byte == MESSAGE_END) {
+                _bufferCount = 0;
+                _state = MESSAGE_RECEIVER_STATE_DATA;
+            }
+        } else if (_state == MESSAGE_RECEIVER_STATE_DATA) {
+            if (byte == MESSAGE_END) {
+                if (_bufferCount > 0) {
+                    _state = MESSAGE_RECEIVER_STATE_AVAILABLE;
+                } else {
+                    _state = MESSAGE_RECEIVER_STATE_WAIT_START;
+                }
+            } else if (byte == MESSAGE_ESCAPE) {
+                _state = MESSAGE_RECEIVER_STATE_ESCAPE;
+            } else {
+                if (_bufferCount < _bufferSize) {
+                    _buffer[_bufferCount++] = byte;
+                } else {
+                    _state = MESSAGE_RECEIVER_STATE_DATA_OVERFLOW;
+                }
+            }
+        } else if (_state == MESSAGE_RECEIVER_STATE_ESCAPE) {
+            if (byte == MESSAGE_ESCAPE_END) {
+                if (_bufferCount < _bufferSize) {
+                    _buffer[_bufferCount++] = MESSAGE_END;
+                    _state = MESSAGE_RECEIVER_STATE_DATA;
+                } else {
+                    _state = MESSAGE_RECEIVER_STATE_DATA_OVERFLOW;
+                }
+            } else if (byte == MESSAGE_ESCAPE_ESCAPE) {
+                if (_bufferCount < _bufferSize) {
+                    _buffer[_bufferCount++] = MESSAGE_ESCAPE;
+                    _state = MESSAGE_RECEIVER_STATE_DATA;
+                } else {
+                    _state = MESSAGE_RECEIVER_STATE_DATA_OVERFLOW;
+                }
+            } else {
+                _state = MESSAGE_RECEIVER_STATE_WAIT_START;
+            }
+        } else if (_state == MESSAGE_RECEIVER_STATE_AVAILABLE) {
+            _state = MESSAGE_RECEIVER_STATE_MESSAGE_OVERFLOW;
+        }
+    }
+}
+
+bool MessageReceiver::dispatch()
+{
+    if (_state == MESSAGE_RECEIVER_STATE_AVAILABLE || _state == MESSAGE_RECEIVER_STATE_MESSAGE_OVERFLOW) {
+        // In the case of a message overflow the message is still valid.
+        _messageCallback(const_cast<uint8_t *>(_buffer), _bufferCount);
+
+        // A message overflow could occur during the above callback.
+        if (_state == MESSAGE_RECEIVER_STATE_MESSAGE_OVERFLOW) {
+            _errorCallback(MESSAGE_RECEIVER_ERROR_MESSAGE_OVERFLOW);
+        }
+    } else if (_state == MESSAGE_RECEIVER_STATE_DATA_OVERFLOW) {
+        _errorCallback(MESSAGE_RECEIVER_ERROR_DATA_OVERFLOW);
+    } else {
+        if (_state != MESSAGE_RECEIVER_STATE_WAIT_START) {
+            uint32_t lastReceiveTime = _lastReceiveTime;
+            uint32_t time = HAL_GetTick();
+
+            if (time - lastReceiveTime > _timeout) {
+                Debug::trap(201, "state = %d, lastReceiveTime = %d, time = %d", _state, lastReceiveTime, time);
+
+                _state = MESSAGE_RECEIVER_STATE_WAIT_START;
+
+                _errorCallback(MESSAGE_RECEIVER_ERROR_TIMEOUT);
+            }
+        }
+
+        return false;
+    }
+
+    _state = MESSAGE_RECEIVER_STATE_WAIT_START;
+
+    return true;
+}
+
+extern USBD_HandleTypeDef hUsbDeviceFS;
+
+HAL_StatusTypeDef transmit(const uint8_t *buffer, size_t bufferCount, uint32_t timeout)
+{
+    if (hUsbDeviceFS.dev_state != USBD_STATE_CONFIGURED) {
+        return HAL_ERROR;
+    }
+
+    USBD_CDC_HandleTypeDef *cdc = reinterpret_cast<USBD_CDC_HandleTypeDef *>(hUsbDeviceFS.pClassData);
+
+    uint32_t startTime = HAL_GetTick();
+
+    while (cdc->TxState != 0) {
+        if (timeout != HAL_MAX_DELAY) {
+            if (HAL_GetTick() - startTime > timeout || timeout == 0) {
+                return HAL_TIMEOUT;
+            }
+        }
+    }
+
+    HAL_StatusTypeDef status = (HAL_StatusTypeDef) CDC_Transmit_FS(const_cast<uint8_t *>(buffer), bufferCount);
+
+    if (status != HAL_OK) {
+        return status;
+    }
+
+    startTime = HAL_GetTick();
+
+    while (cdc->TxState != 0) {
+        if (timeout != HAL_MAX_DELAY) {
+            if (HAL_GetTick() - startTime > timeout || timeout == 0) {
+                return HAL_TIMEOUT;
+            }
+        }
+    }
+
+    return HAL_OK;
+}
+
+inline size_t encode(uint8_t *buffer, size_t size, uint8_t byte)
+{
+    if (byte == MESSAGE_END || byte == MESSAGE_ESCAPE) {
+        if (size < 2) {
+            return 0;
+        }
+
+        buffer[0] = MESSAGE_ESCAPE;
+
+        if (byte == MESSAGE_END)
+            buffer[1] = MESSAGE_ESCAPE_END;
+        else if (byte == MESSAGE_ESCAPE)
+            buffer[1] = MESSAGE_ESCAPE_ESCAPE;
+
+        return 2;
+    }
+
+    if (size < 1) {
+        return 0;
+    }
+
+    buffer[0] = byte;
+
+    return 1;
+}
+
+#define PACKET_SIZE 64
+
+// In order to simplify the breaking up of a message into multiple packets we reserve
+// space at the end of every packet for the footer and end symbol. If the packet
+// contained a real checksum in the footer then this would be at worst case 5 to
+// allow for the encoding.
+#define RESERVED 3
+
+bool MessageSender::send(const uint8_t *buffer, size_t bufferCount)
+{
+    uint8_t packet[PACKET_SIZE];
+
+    size_t packetCount = 0;
+    size_t remainingPacketSize = PACKET_SIZE - RESERVED;
+
+    // Start the message and encode the header, we assume that there is space for the header.
+    packet[packetCount++] = MESSAGE_END;
+
+    remainingPacketSize--;
+
+    size_t count = encode(&packet[packetCount], remainingPacketSize, (u_int8_t) (bufferCount >> 8));
+
+    packetCount += count;
+    remainingPacketSize -= count;
+
+    count = encode(&packet[packetCount], remainingPacketSize, (u_int8_t) bufferCount);
+
+    packetCount += count;
+    remainingPacketSize -= count;
+
+    // Encode the data, once the packet size has been reached transmit the packet.
+    size_t index = 0;
+
+    while (index < bufferCount) {
+        count = encode(&packet[packetCount], remainingPacketSize, buffer[index]);
+
+        if (count > 0) {
+            index++;
+        }
+
+        packetCount += count;
+        remainingPacketSize -= count;
+
+        // Transmit the packet and begin a new packet.
+        if (count == 0 || remainingPacketSize == 0) {
+            if (transmit(packet, packetCount, 1000) != HAL_OK) {
+                return false;
+            }
+
+            packetCount = 0;
+            remainingPacketSize = PACKET_SIZE - RESERVED;
+        }
+    }
+
+    // Add the footer (space has been reserved), end the message and transmit the packet.
+    packet[packetCount++] = 0;
+    packet[packetCount++] = 0;
+    packet[packetCount++] = MESSAGE_END;
+
+    if (!transmit(packet, packetCount, 1000)) {
+        return false;
+    }
+
+    return true;
+}

interface2/fpga/Makefile

@@ -0,0 +1,13 @@
+SUBDIRS = tests rtl
+
+all: $(SUBDIRS)
+
+$(SUBDIRS):
+	$(MAKE) -C $@
+
+clean:
+	for dir in $(SUBDIRS); do \
+		$(MAKE) -C $$dir clean; \
+	done
+
+.PHONY: all $(SUBDIRS) clean

interface2/fpga/rtl/.gitignore

@@ -0,0 +1,10 @@
+*.json
+*.asc
+*.bin
+
+# iCEcube2
+.mac_address
+coax_Implmnt
+synlog.tcl
+*.log
+*.log.bak

interface2/fpga/rtl/Makefile

@@ -0,0 +1 @@
+include icecube2.mk

interface2/fpga/rtl/clocks.sdc

@@ -0,0 +1,2 @@
+create_clock -period 25.00 -name {clk} [get_ports {clk}]
+create_clock -period 100.00 -name {spi_sck} [get_ports {spi_sck}]

interface2/fpga/rtl/coax_buffer.v

@@ -0,0 +1,94 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_buffer (
+    input clk,
+    input reset,
+    input [9:0] write_data,
+    input write_strobe,
+    output [9:0] read_data,
+    input read_strobe,
+    output empty,
+    output full,
+    output reg almost_empty,
+    output reg almost_full
+);
+    parameter DEPTH = 256;
+    parameter ALMOST_EMPTY_THRESHOLD = 64;
+    parameter ALMOST_FULL_THRESHOLD = 192;
+
+    fifo_sync_ram #(
+        .DEPTH(DEPTH),
+        .WIDTH(10)
+    ) fifo (
+        .wr_data(write_data),
+        .wr_ena(write_strobe),
+        .wr_full(full),
+        .rd_data(read_data),
+        .rd_ena(read_strobe),
+        .rd_empty(empty),
+        .clk(clk),
+        .rst(reset)
+    );
+
+    reg write_strobe_only;
+    reg read_strobe_only;
+    reg not_empty;
+    reg not_full;
+
+    always @(posedge clk)
+    begin
+        write_strobe_only <= (write_strobe && !read_strobe);
+        read_strobe_only <= (read_strobe && !write_strobe);
+
+        not_empty <= !empty;
+        not_full <= !full;
+    end
+
+    reg increment_level;
+    reg decrement_level;
+
+    always @(posedge clk)
+    begin
+        increment_level <= (write_strobe_only && not_full);
+        decrement_level <= (read_strobe_only && not_empty);
+
+        if (reset)
+        begin
+            increment_level <= 0;
+            decrement_level <= 0;
+        end
+    end
+
+    reg [$clog2(DEPTH):0] level;
+
+    always @(posedge clk)
+    begin
+        if (increment_level)
+            level <= level + 1;
+        else if (decrement_level)
+            level <= level - 1;
+
+        if (reset)
+            level <= 0;
+    end
+
+    always @(posedge clk)
+    begin
+        almost_empty <= (level <= ALMOST_EMPTY_THRESHOLD);
+        almost_full <= (level >= ALMOST_FULL_THRESHOLD);
+    end
+endmodule

interface2/fpga/rtl/coax_buffered_rx.v

@@ -0,0 +1,85 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_buffered_rx (
+    input clk,
+    input reset,
+    input rx,
+    output active,
+    output error,
+    output [9:0] data,
+    input read_strobe,
+    output empty,
+    output full,
+    input parity
+);
+    parameter CLOCKS_PER_BIT = 8;
+    parameter DEPTH = 256;
+
+    localparam ERROR_OVERFLOW = 10'b0000001000;
+
+    wire coax_rx_error;
+    wire [9:0] coax_rx_data;
+    wire coax_rx_strobe;
+
+    coax_rx #(
+        .CLOCKS_PER_BIT(CLOCKS_PER_BIT)
+    ) coax_rx (
+        .clk(clk),
+        .reset(reset),
+        .rx(rx),
+        .active(active),
+        .error(coax_rx_error),
+        .data(coax_rx_data),
+        .strobe(coax_rx_strobe),
+        .parity(parity)
+    );
+
+    wire [9:0] coax_buffer_data;
+
+    coax_buffer #(
+        .DEPTH(DEPTH)
+    ) coax_buffer (
+        .clk(clk),
+        .reset(reset),
+        .write_data(coax_rx_data),
+        .write_strobe(coax_rx_strobe),
+        .read_data(coax_buffer_data),
+        .read_strobe(read_strobe && !error),
+        .empty(empty),
+        .full(full)
+    );
+
+    wire overflow;
+
+    assign overflow = ((active && !previous_active && !empty) || (coax_rx_strobe && full));
+
+    reg overflowed = 0;
+    reg previous_active;
+
+    always @(posedge clk)
+    begin
+        if (reset)
+            overflowed <= 0;
+        else if (overflow)
+            overflowed <= 1;
+
+        previous_active <= active;
+    end
+
+    assign error = overflow || overflowed || coax_rx_error;
+    assign data = (overflow || overflowed) ? ERROR_OVERFLOW : (coax_rx_error ? coax_rx_data : (empty ? 10'b0 : coax_buffer_data));
+endmodule

interface2/fpga/rtl/coax_buffered_tx.v

@@ -0,0 +1,151 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_buffered_tx (
+    input clk,
+    input reset,
+    output active,
+    output tx,
+    input [9:0] data,
+    input load_strobe,
+    input start_strobe,
+    output empty,
+    output full,
+    output reg ready,
+    input parity
+);
+    parameter CLOCKS_PER_BIT = 8;
+    parameter DEPTH = 256;
+    parameter START_DEPTH = DEPTH * 0.75;
+
+    localparam STATE_IDLE = 0;
+    localparam STATE_TRANSMITTING_1 = 1;
+    localparam STATE_TRANSMITTING_2 = 2;
+    localparam STATE_TRANSMITTING_3 = 3;
+
+    reg [1:0] state = STATE_IDLE;
+    reg [1:0] next_state;
+
+    reg next_ready;
+
+    wire [9:0] coax_tx_data;
+    reg coax_tx_strobe = 0;
+    reg next_coax_tx_strobe;
+    wire coax_tx_ready;
+
+    coax_tx #(
+        .CLOCKS_PER_BIT(CLOCKS_PER_BIT)
+    ) coax_tx (
+        .clk(clk),
+        .reset(reset),
+        .active(active),
+        .tx(tx),
+        .data(coax_tx_data),
+        .strobe(coax_tx_strobe),
+        .ready(coax_tx_ready),
+        .parity(parity)
+    );
+
+    reg coax_buffer_read_strobe = 0;
+    reg next_coax_buffer_read_strobe;
+    wire coax_buffer_almost_full;
+
+    coax_buffer #(
+        .DEPTH(DEPTH),
+        .ALMOST_FULL_THRESHOLD(START_DEPTH)
+    ) coax_buffer (
+        .clk(clk),
+        .reset(reset),
+        .write_data(data),
+        .write_strobe(load_strobe),
+        .read_data(coax_tx_data),
+        .read_strobe(coax_buffer_read_strobe),
+        .empty(empty),
+        .almost_full(coax_buffer_almost_full),
+        .full(full)
+    );
+
+    always @(*)
+    begin
+        next_state = state;
+
+        next_coax_tx_strobe = 0;
+        next_coax_buffer_read_strobe = 0;
+
+        next_ready = 1;
+
+        case (state)
+            STATE_IDLE:
+            begin
+                // NOTE: Redundant check of almost full AND not empty is in
+                // order to protect against bugs with the almost full logic.
+                if ((start_strobe || coax_buffer_almost_full) && !empty)
+                    next_state = STATE_TRANSMITTING_1;
+            end
+
+            STATE_TRANSMITTING_1:
+            begin
+                if (coax_tx_ready)
+                begin
+                    if (!empty)
+                    begin
+                        next_coax_tx_strobe = 1;
+                        next_state = STATE_TRANSMITTING_2;
+                    end
+                    else
+                    begin
+                        next_ready = 0;
+                        next_state = STATE_TRANSMITTING_3;
+                    end
+                end
+            end
+
+            STATE_TRANSMITTING_2:
+            begin
+                next_coax_buffer_read_strobe = 1;
+                next_state = STATE_TRANSMITTING_1;
+            end
+
+            STATE_TRANSMITTING_3:
+            begin
+                next_ready = 0;
+
+                if (!active)
+                    next_state = STATE_IDLE;
+            end
+        endcase
+    end
+
+    always @(posedge clk)
+    begin
+        state <= next_state;
+
+        coax_tx_strobe <= next_coax_tx_strobe;
+        coax_buffer_read_strobe <= next_coax_buffer_read_strobe;
+
+        ready <= next_ready;
+
+        if (reset)
+        begin
+            state <= STATE_IDLE;
+
+            coax_tx_strobe <= 0;
+            coax_buffer_read_strobe <= 0;
+
+            ready <= 1;
+        end
+    end
+endmodule

interface2/fpga/rtl/coax_rx.v

@@ -0,0 +1,415 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_rx (
+    input clk,
+    input reset,
+    input rx,
+    output reg active,
+    output reg error,
+    output reg [9:0] data,
+    output reg strobe = 0,
+    input parity
+);
+    parameter CLOCKS_PER_BIT = 8;
+
+    localparam ERROR_LOSS_OF_MID_BIT_TRANSITION = 10'b0000000001;
+    localparam ERROR_PARITY = 10'b0000000010;
+    localparam ERROR_INVALID_END_SEQUENCE = 10'b0000000100;
+
+    localparam STATE_IDLE = 0;
+    localparam STATE_START_SEQUENCE_1 = 1;
+    localparam STATE_START_SEQUENCE_2 = 2;
+    localparam STATE_START_SEQUENCE_3 = 3;
+    localparam STATE_START_SEQUENCE_4 = 4;
+    localparam STATE_START_SEQUENCE_5 = 5;
+    localparam STATE_START_SEQUENCE_6 = 6;
+    localparam STATE_START_SEQUENCE_7 = 7;
+    localparam STATE_START_SEQUENCE_8 = 8;
+    localparam STATE_START_SEQUENCE_9 = 9;
+    localparam STATE_SYNC_BIT = 10;
+    localparam STATE_DATA_BIT = 11;
+    localparam STATE_PARITY_BIT = 12;
+    localparam STATE_END_SEQUENCE_1 = 13;
+    localparam STATE_END_SEQUENCE_2 = 14;
+    localparam STATE_ERROR = 15;
+
+    reg [3:0] state = STATE_IDLE;
+    reg [3:0] next_state;
+    reg [7:0] state_counter;
+    reg [7:0] next_state_counter;
+
+    reg previous_rx;
+
+    reg bit_timer_reset = 0;
+    reg next_bit_timer_reset;
+
+    reg [9:0] next_data;
+    reg next_strobe;
+
+    reg [9:0] input_data;
+    reg [9:0] next_input_data;
+    reg input_data_parity;
+
+    reg [3:0] bit_counter = 0;
+    reg [3:0] next_bit_counter;
+
+    reg next_active;
+    reg next_error;
+
+    wire sample;
+    wire synchronized;
+
+    coax_rx_bit_timer #(
+        .CLOCKS_PER_BIT(CLOCKS_PER_BIT)
+    ) bit_timer (
+        .clk(clk),
+        .rx(rx),
+        .reset(bit_timer_reset),
+        .sample(sample),
+        .synchronized(synchronized)
+    );
+
+    always @(*)
+    begin
+        next_state = state;
+        next_state_counter = state_counter + 1;
+
+        next_bit_timer_reset = 0;
+
+        next_data = data;
+        next_strobe = 0;
+
+        next_input_data = input_data;
+        next_bit_counter = bit_counter;
+
+        next_active = 0;
+        next_error = 0;
+
+        case (state)
+            STATE_IDLE:
+            begin
+                next_bit_timer_reset = 1;
+
+                if (!rx && previous_rx)
+                begin
+                    next_state = STATE_START_SEQUENCE_1;
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_1:
+            begin
+                if (sample)
+                begin
+                    if (synchronized && rx)
+                        next_state = STATE_START_SEQUENCE_2;
+                    else
+                        next_state = STATE_IDLE;
+
+                    next_state_counter = 0;
+                end
+                else if (state_counter >= (CLOCKS_PER_BIT * 2))
+                begin
+                    next_state = STATE_IDLE;
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_2:
+            begin
+                if (sample)
+                begin
+                    if (synchronized && rx)
+                        next_state = STATE_START_SEQUENCE_3;
+                    else
+                        next_state = STATE_IDLE;
+
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_3:
+            begin
+                if (sample)
+                begin
+                    if (synchronized && rx)
+                        next_state = STATE_START_SEQUENCE_4;
+                    else
+                        next_state = STATE_IDLE;
+
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_4:
+            begin
+                if (sample)
+                begin
+                    if (synchronized && rx)
+                        next_state = STATE_START_SEQUENCE_5;
+                    else
+                        next_state = STATE_IDLE;
+
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_5:
+            begin
+                if (sample)
+                begin
+                    if (synchronized && rx)
+                        next_state = STATE_START_SEQUENCE_6;
+                    else
+                        next_state = STATE_IDLE;
+
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_6:
+            begin
+                if (!rx)
+                begin
+                    next_state = STATE_START_SEQUENCE_7;
+                    next_state_counter = 0;
+                end
+                else if (state_counter >= CLOCKS_PER_BIT)
+                begin
+                    next_state = STATE_IDLE;
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_7:
+            begin
+                if (rx)
+                begin
+                    next_state = STATE_START_SEQUENCE_8;
+                    next_state_counter = 0;
+                end
+                else if (state_counter >= (CLOCKS_PER_BIT * 2))
+                begin
+                    next_state = STATE_IDLE;
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_8:
+            begin
+                if (!rx)
+                begin
+                    next_bit_timer_reset = 1;
+                    next_state = STATE_START_SEQUENCE_9;
+                    next_state_counter = 0;
+                end
+                else if (state_counter >= (CLOCKS_PER_BIT * 2))
+                begin
+                    next_state = STATE_IDLE;
+                    next_state_counter = 0;
+                end
+            end
+
+            STATE_START_SEQUENCE_9:
+            begin
+                // This is really the first STATE_SYNC_BIT but we treat it
+                // differently and consider it part of the start
+                // sequence.
+
+                if (sample && synchronized)
+                begin
+                    if (rx)
+                    begin
+                        next_bit_counter = 0;
+                        next_state = STATE_DATA_BIT;
+                    end
+                    else
+                    begin
+                        next_state = STATE_IDLE;
+                    end
+
+                    next_state_counter = 0;
+                end
+                else if (state_counter >= CLOCKS_PER_BIT)
+                begin
+                    next_state = STATE_IDLE;
+                    next_state_counter = 0;
+                end
+           end
+
+           STATE_SYNC_BIT:
+           begin
+               next_active = 1;
+
+               if (sample)
+               begin
+                   if (synchronized)
+                   begin
+                       if (rx)
+                       begin
+                           next_bit_counter = 0;
+                           next_state = STATE_DATA_BIT;
+                       end
+                       else
+                       begin
+                           next_state = STATE_END_SEQUENCE_1;
+                       end
+
+                       next_state_counter = 0;
+                   end
+                   else
+                   begin
+                       next_data = ERROR_LOSS_OF_MID_BIT_TRANSITION;
+                       next_state = STATE_ERROR;
+                       next_state_counter = 0;
+                   end
+               end
+           end
+
+           STATE_DATA_BIT:
+           begin
+               next_active = 1;
+
+               if (sample)
+               begin
+                   if (synchronized)
+                   begin
+                       next_input_data = { input_data[8:0], rx };
+
+                       if (bit_counter < 9)
+                       begin
+                           next_bit_counter = bit_counter + 1;
+                       end
+                       else
+                       begin
+                           next_state = STATE_PARITY_BIT;
+                       end
+
+                       next_state_counter = 0;
+                   end
+                   else
+                   begin
+                       next_data = ERROR_LOSS_OF_MID_BIT_TRANSITION;
+                       next_state = STATE_ERROR;
+                       next_state_counter = 0;
+                   end
+               end
+           end
+
+           STATE_PARITY_BIT:
+           begin
+               next_active = 1;
+
+               if (sample)
+               begin
+                   if (synchronized)
+                   begin
+                       if (rx == input_data_parity)
+                       begin
+                           next_strobe = 1;
+                           next_data = input_data;
+                           next_state = STATE_SYNC_BIT;
+                       end
+                       else
+                       begin
+                           next_data = ERROR_PARITY;
+                           next_state = STATE_ERROR;
+                       end
+
+                       next_state_counter = 0;
+                   end
+                   else
+                   begin
+                       next_data = ERROR_LOSS_OF_MID_BIT_TRANSITION;
+                       next_state = STATE_ERROR;
+                       next_state_counter = 0;
+                   end
+               end
+           end
+
+           STATE_END_SEQUENCE_1:
+           begin
+               if (rx)
+               begin
+                   next_state = STATE_END_SEQUENCE_2;
+                   next_state_counter = 0;
+               end
+               else if (state_counter >= CLOCKS_PER_BIT)
+               begin
+                   next_data = ERROR_INVALID_END_SEQUENCE;
+                   next_state = STATE_ERROR;
+                   next_state_counter = 0;
+               end
+           end
+
+           STATE_END_SEQUENCE_2:
+           begin
+               // TODO: should this go to ERROR on timeout?
+               if (!rx)
+               begin
+                   next_state = STATE_IDLE;
+                   next_state_counter = 0;
+               end
+               else if (state_counter >= (CLOCKS_PER_BIT * 2))
+               begin
+                   next_state = STATE_IDLE;
+                   next_state_counter = 0;
+               end
+           end
+
+           STATE_ERROR:
+           begin
+               next_error = 1;
+           end
+        endcase
+    end
+
+    always @(posedge clk)
+    begin
+        state <= next_state;
+        state_counter <= next_state_counter;
+
+        bit_timer_reset <= next_bit_timer_reset;
+
+        data <= next_data;
+        strobe <= next_strobe;
+
+        input_data <= next_input_data;
+
+        // Parity includes the sync bit.
+        input_data_parity <= (parity == 1 ? ^{ 1'b1, input_data } : ~^{ 1'b1, input_data });
+
+        bit_counter <= next_bit_counter;
+
+        active <= next_active;
+        error <= next_error;
+
+        if (reset)
+        begin
+            bit_timer_reset <= 1;
+
+            state <= STATE_IDLE;
+
+            strobe <= 0;
+
+            active <= 0;
+            error <= 0;
+        end
+
+        previous_rx <= rx;
+    end
+endmodule

interface2/fpga/rtl/coax_rx_bit_timer.v

@@ -0,0 +1,111 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_rx_bit_timer (
+    input clk,
+    input rx,
+    input reset,
+    output reg sample,
+    output reg synchronized
+);
+    parameter CLOCKS_PER_BIT = 8;
+
+    localparam IDLE = 0;
+    localparam SYNCHRONIZED = 1;
+    localparam UNSYNCHRONIZED = 2;
+
+    reg [1:0] state = IDLE;
+    reg [1:0] next_state;
+
+    reg previous_rx;
+
+    reg [$clog2(CLOCKS_PER_BIT*2):0] transition_counter = 0;
+    reg [$clog2(CLOCKS_PER_BIT*2):0] next_transition_counter;
+    reg [$clog2(CLOCKS_PER_BIT):0] bit_counter = 0;
+    reg [$clog2(CLOCKS_PER_BIT):0] next_bit_counter;
+
+    always @(*)
+    begin
+        next_state = state;
+
+        sample = 0;
+        synchronized = 0;
+
+        next_transition_counter = transition_counter;
+        next_bit_counter = bit_counter;
+
+        case (state)
+            IDLE:
+            begin
+                if (rx != previous_rx)
+                begin
+                    next_transition_counter = 0;
+                    next_bit_counter = CLOCKS_PER_BIT / 2;
+
+                    next_state = SYNCHRONIZED;
+                end
+            end
+
+            SYNCHRONIZED:
+            begin
+                if (transition_counter < (CLOCKS_PER_BIT + (CLOCKS_PER_BIT / 4)))
+                    next_transition_counter = transition_counter + 1;
+                else
+                    next_state = UNSYNCHRONIZED;
+
+                synchronized = 1;
+
+                if (bit_counter < CLOCKS_PER_BIT)
+                    next_bit_counter = bit_counter + 1;
+                else
+                    next_bit_counter = 0;
+
+                if (rx != previous_rx && transition_counter > (CLOCKS_PER_BIT / 2))
+                begin
+                    next_transition_counter = 0;
+                    next_bit_counter = CLOCKS_PER_BIT / 2;
+                end
+
+                if (bit_counter == ((CLOCKS_PER_BIT / 4) * 3))
+                    sample = 1;
+            end
+
+            UNSYNCHRONIZED:
+            begin
+                if (bit_counter < CLOCKS_PER_BIT)
+                    next_bit_counter = bit_counter + 1;
+                else
+                    next_bit_counter = 0;
+
+                if (bit_counter == ((CLOCKS_PER_BIT / 4) * 3))
+                    sample = 1;
+            end
+        endcase
+    end
+
+    always @(posedge clk)
+    begin
+        state <= next_state;
+
+        transition_counter <= next_transition_counter;
+        bit_counter <= next_bit_counter;
+
+        if (reset)
+            state <= IDLE;
+
+        previous_rx <= rx;
+    end
+endmodule

interface2/fpga/rtl/coax_syn.prj

@@ -0,0 +1,71 @@
+#-- Synopsys, Inc.
+#-- Project file /home/andrew/lattice_coax/coax/coax_syn.prj
+#project files
+
+add_file -verilog -lib work "coax_buffered_rx.v"
+add_file -verilog -lib work "coax_rx.v"
+add_file -verilog -lib work "coax_rx_bit_timer.v"
+add_file -verilog -lib work "coax_tx.v"
+add_file -verilog -lib work "coax_tx_bit_timer.v"
+add_file -verilog -lib work "coax_tx_distorter.v"
+add_file -verilog -lib work "control.v"
+add_file -verilog -lib work "spi_device.v"
+add_file -verilog -lib work "coax_buffered_tx.v"
+add_file -verilog -lib work "coax_buffer.v"
+add_file -verilog -lib work "third_party/fifo_sync_ram.v"
+add_file -verilog -lib work "third_party/ram_sdp.v"
+add_file -verilog -lib work "strobe_cdc.v"
+add_file -verilog -lib work "top.v"
+add_file -verilog -lib work "dual_clock_spi_device.v"
+add_file -constraint -lib work "clocks.sdc"
+#implementation: "coax_Implmnt"
+impl -add coax_Implmnt -type fpga
+
+#implementation attributes
+set_option -vlog_std v2001
+set_option -project_relative_includes 1
+
+#device options
+set_option -technology SBTiCE40UP
+set_option -part iCE40UP5K
+set_option -package SG48
+set_option -speed_grade
+set_option -part_companion ""
+
+#compilation/mapping options
+
+# mapper_options
+set_option -frequency auto
+set_option -write_verilog 0
+set_option -write_vhdl 0
+
+# Silicon Blue iCE40UP
+set_option -maxfan 10000
+set_option -disable_io_insertion 0
+set_option -pipe 1
+set_option -retiming 0
+set_option -update_models_cp 0
+set_option -fixgatedclocks 2
+set_option -fixgeneratedclocks 0
+
+# NFilter
+set_option -popfeed 0
+set_option -constprop 0
+set_option -createhierarchy 0
+
+# sequential_optimization_options
+set_option -symbolic_fsm_compiler 1
+
+# Compiler Options
+set_option -compiler_compatible 0
+set_option -resource_sharing 1
+
+#automatic place and route (vendor) options
+set_option -write_apr_constraint 1
+
+#set result format/file last
+project -result_format "edif"
+project -result_file ./coax_Implmnt/coax.edf
+project -log_file "./coax_Implmnt/coax.srr"
+impl -active coax_Implmnt
+project -run synthesis -clean

interface2/fpga/rtl/coax_tx.v

@@ -0,0 +1,308 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_tx (
+    input clk,
+    input reset,
+    output reg active,
+    output reg tx,
+    input [9:0] data,
+    input strobe,
+    output ready,
+    input parity
+);
+    parameter CLOCKS_PER_BIT = 8;
+
+    localparam IDLE = 0;
+    localparam START_SEQUENCE_1 = 1;
+    localparam START_SEQUENCE_2 = 2;
+    localparam START_SEQUENCE_3 = 3;
+    localparam START_SEQUENCE_4 = 4;
+    localparam START_SEQUENCE_5 = 5;
+    localparam START_SEQUENCE_6 = 6;
+    localparam START_SEQUENCE_7 = 7;
+    localparam START_SEQUENCE_8 = 8;
+    localparam START_SEQUENCE_9 = 9;
+    localparam SYNC_BIT = 10;
+    localparam DATA_BIT = 11;
+    localparam PARITY_BIT = 12;
+    localparam END_SEQUENCE_1 = 13;
+    localparam END_SEQUENCE_2 = 14;
+    localparam END_SEQUENCE_3 = 15;
+
+    reg [3:0] state = IDLE;
+    reg [3:0] next_state;
+
+    reg next_tx;
+
+    reg end_sequence;
+    reg next_end_sequence;
+
+    reg [9:0] output_data;
+    reg [9:0] next_output_data;
+    reg output_data_full = 0;
+    reg next_output_data_full;
+    reg parity_bit;
+    reg next_parity_bit;
+    reg output_parity_bit;
+    reg next_output_parity_bit;
+
+    reg [3:0] bit_counter = 0;
+    reg [3:0] next_bit_counter;
+
+    reg bit_timer_reset = 0;
+    reg next_bit_timer_reset;
+
+    wire first_half;
+    wire second_half;
+    wire last_clock;
+
+    coax_tx_bit_timer #(
+        .CLOCKS_PER_BIT(CLOCKS_PER_BIT)
+    ) bit_timer (
+        .clk(clk),
+        .reset(bit_timer_reset),
+        .first_half(first_half),
+        .second_half(second_half),
+        .last_clock(last_clock)
+    );
+
+    always @(*)
+    begin
+        next_state = state;
+
+        next_tx = 0;
+
+        next_end_sequence = 0;
+
+        next_output_data = output_data;
+        next_output_data_full = output_data_full;
+        next_parity_bit = parity_bit;
+        next_output_parity_bit = output_parity_bit;
+
+        if (strobe && ready)
+        begin
+            next_output_data = data;
+            next_output_data_full = 1;
+
+            // Parity includes the sync bit.
+            next_parity_bit = (parity == 1 ? ^{ 1'b1, data } : ~^{ 1'b1, data });
+        end
+
+        next_bit_counter = bit_counter;
+
+        next_bit_timer_reset = 0;
+
+        case (state)
+            IDLE:
+            begin
+                next_bit_timer_reset = 1;
+
+                if (output_data_full)
+                begin
+                    next_state = START_SEQUENCE_1;
+                end
+            end
+
+            START_SEQUENCE_1:
+            begin
+                next_tx = 1;
+
+                // TODO... off by 1
+                if (second_half)
+                begin
+                    next_bit_timer_reset = 1;
+                    next_state = START_SEQUENCE_2;
+                end
+            end
+
+            START_SEQUENCE_2:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_3;
+            end
+
+            START_SEQUENCE_3:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_4;
+            end
+
+            START_SEQUENCE_4:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_5;
+            end
+
+            START_SEQUENCE_5:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_6;
+            end
+
+            START_SEQUENCE_6:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_7;
+            end
+
+            START_SEQUENCE_7:
+            begin
+                next_tx = 0;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_8;
+            end
+
+            START_SEQUENCE_8:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                if (last_clock)
+                    next_state = START_SEQUENCE_9;
+            end
+
+            START_SEQUENCE_9:
+            begin
+                next_tx = 1;
+
+                if (last_clock)
+                    next_state = SYNC_BIT;
+            end
+
+            SYNC_BIT:
+            begin
+                next_tx = first_half ? 0 : 1;
+
+                next_bit_counter = 9;
+
+                if (last_clock)
+                    next_state = DATA_BIT;
+            end
+
+            DATA_BIT:
+            begin
+                next_tx = first_half ? ~output_data[9] : output_data[9];
+
+                if (last_clock)
+                begin
+                    next_output_data = { output_data[8:0], output_data[9] };
+                    next_bit_counter = bit_counter - 1;
+
+                    if (bit_counter == 0)
+                    begin
+                        next_output_data_full = 0;
+                        next_output_parity_bit = parity_bit;
+
+                        next_state = PARITY_BIT;
+                    end
+                end
+            end
+
+            PARITY_BIT:
+            begin
+                next_tx = first_half ? ~output_parity_bit : output_parity_bit;
+
+                if (last_clock)
+                begin
+                    if (output_data_full)
+                    begin
+                        next_state = SYNC_BIT;
+                    end
+                    else
+                    begin
+                        next_end_sequence = 1;
+                        next_state = END_SEQUENCE_1;
+                    end
+                end
+            end
+
+            END_SEQUENCE_1:
+            begin
+                next_tx = first_half ? 1 : 0;
+                next_end_sequence = 1;
+
+                if (last_clock)
+                    next_state = END_SEQUENCE_2;
+            end
+
+            END_SEQUENCE_2:
+            begin
+                next_tx = 1;
+                next_end_sequence = 1;
+
+                if (last_clock)
+                    next_state = END_SEQUENCE_3;
+            end
+
+            END_SEQUENCE_3:
+            begin
+                next_tx = 1;
+                next_end_sequence = 1;
+
+                if (last_clock)
+                begin
+                    next_tx = 0;
+                    next_end_sequence = 0;
+                    next_state = IDLE;
+                end
+            end
+        endcase
+    end
+
+    always @(posedge clk)
+    begin
+        state <= next_state;
+
+        active <= (state != IDLE); // TODO: this causes active to remain high one additional clock cycle
+        tx <= next_tx;
+
+        end_sequence <= next_end_sequence;
+
+        output_data <= next_output_data;
+        output_data_full <= next_output_data_full;
+        parity_bit <= next_parity_bit;
+        output_parity_bit <= next_output_parity_bit;
+
+        bit_counter <= next_bit_counter;
+
+        bit_timer_reset <= next_bit_timer_reset;
+
+        if (reset)
+        begin
+            state <= IDLE;
+
+            active <= 0;
+            tx <= 0;
+
+            end_sequence <= 0;
+
+            output_data_full <= 0;
+        end
+    end
+
+    assign ready = (!output_data_full && !end_sequence);
+endmodule

interface2/fpga/rtl/coax_tx_bit_timer.v

@@ -0,0 +1,46 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_tx_bit_timer (
+    input clk,
+    input reset,
+    output first_half,
+    output second_half,
+    output last_clock
+);
+    parameter CLOCKS_PER_BIT = 8;
+
+    reg [$clog2(CLOCKS_PER_BIT):0] counter = 0;
+    reg [$clog2(CLOCKS_PER_BIT):0] next_counter;
+
+    always @(*)
+    begin
+        next_counter = last_clock ? 0 : counter + 1;
+    end
+
+    always @(posedge clk)
+    begin
+        counter <= next_counter;
+
+        if (reset)
+            counter <= 0;
+    end
+
+    assign first_half = (counter < CLOCKS_PER_BIT / 2);
+    assign second_half = ~first_half;
+
+    assign last_clock = (counter == CLOCKS_PER_BIT - 1);
+endmodule

interface2/fpga/rtl/coax_tx_distorter.v

@@ -0,0 +1,53 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module coax_tx_distorter (
+    input clk,
+    input active_input,
+    input tx_input,
+    output reg active_output,
+    output reg tx_output,
+    output reg tx_delay,
+    output reg tx_n
+);
+    parameter CLOCKS_PER_BIT = 8;
+
+    localparam DELAY_CLOCKS = CLOCKS_PER_BIT / 4;
+
+    reg [DELAY_CLOCKS-1:0] tx_d = { (DELAY_CLOCKS){1'b1} };
+
+    always @(posedge clk)
+    begin
+        if (active_input)
+        begin
+            tx_d <= { tx_d[DELAY_CLOCKS-2:0], tx_input };
+
+            active_output <= 1;
+            tx_output <= tx_input;
+            tx_delay <= tx_d[DELAY_CLOCKS-1];
+            tx_n <= ~tx_input;
+        end
+        else
+        begin
+            tx_d <= { (DELAY_CLOCKS){1'b1} };
+
+            active_output <= 0;
+            tx_output <= 0;
+            tx_delay <= 0;
+            tx_n <= 0;
+        end
+    end
+endmodule

interface2/fpga/rtl/control.v

@@ -0,0 +1,347 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module control (
+    input clk,
+    input reset,
+
+    // SPI
+    input spi_cs_n,
+    input [7:0] spi_rx_data,
+    input spi_rx_strobe,
+    output reg [7:0] spi_tx_data,
+    output reg spi_tx_strobe,
+
+    output loopback,
+
+    // TX
+    output reg tx_reset,
+    input tx_active,
+    output reg [9:0] tx_data,
+    output reg tx_load_strobe,
+    output reg tx_start_strobe,
+    input tx_empty,
+    input tx_full,
+    input tx_ready,
+    output tx_parity,
+
+    // RX
+    output reg rx_reset,
+    input rx_active,
+    input rx_error,
+    input [9:0] rx_data,
+    output reg rx_read_strobe,
+    input rx_empty,
+    output rx_parity
+);
+    parameter DEFAULT_CONTROL_REGISTER = 8'b01001000;
+
+    localparam STATE_IDLE = 0;
+    localparam STATE_READ_REGISTER_1 = 1;
+    localparam STATE_READ_REGISTER_2 = 2;
+    localparam STATE_WRITE_REGISTER_1 = 3;
+    localparam STATE_WRITE_REGISTER_2 = 4;
+    localparam STATE_TX_1 = 5;
+    localparam STATE_TX_2 = 6;
+    localparam STATE_TX_3 = 7;
+    localparam STATE_RX_1 = 8;
+    localparam STATE_RX_2 = 9;
+    localparam STATE_RX_3 = 10;
+    localparam STATE_RX_4 = 11;
+    localparam STATE_RESET = 12;
+
+    reg [7:0] state = STATE_IDLE;
+    reg [7:0] next_state;
+
+    reg [7:0] control_register = DEFAULT_CONTROL_REGISTER;
+    reg [7:0] next_control_register;
+    reg [7:0] register_mask;
+    reg [7:0] next_register_mask;
+
+    reg [7:0] command;
+    reg [7:0] next_command;
+
+    reg [7:0] next_spi_tx_data;
+    reg next_spi_tx_strobe;
+
+    reg next_tx_reset;
+    reg previous_tx_active;
+    reg [9:0] next_tx_data;
+    reg tx_data_valid = 0;
+    reg next_tx_data_valid;
+    reg next_tx_load_strobe;
+    reg next_tx_start_strobe;
+    reg tx_complete = 0;
+    reg next_tx_complete;
+
+    reg next_rx_reset;
+    reg next_rx_read_strobe;
+    reg [15:0] rx_buffer;
+    reg [15:0] next_rx_buffer;
+
+    reg [1:0] spi_cs_n_d;
+
+    always @(posedge clk)
+    begin
+        spi_cs_n_d <= { spi_cs_n_d[0], spi_cs_n };
+    end
+
+    always @(*)
+    begin
+        next_state = state;
+
+        next_control_register = control_register;
+        next_register_mask = register_mask;
+
+        next_command = command;
+
+        next_spi_tx_data = spi_tx_data;
+        next_spi_tx_strobe = 0;
+
+        next_tx_reset = 0;
+        next_tx_data = tx_data;
+        next_tx_data_valid = tx_data_valid;
+        next_tx_load_strobe = 0;
+        next_tx_start_strobe = 0;
+        next_tx_complete = tx_complete;
+
+        next_rx_reset = 0;
+        next_rx_read_strobe = 0;
+        next_rx_buffer = rx_buffer;
+
+        case (state)
+            STATE_IDLE:
+            begin
+                if (spi_rx_strobe)
+                begin
+                    next_command = spi_rx_data;
+
+                    case (spi_rx_data[3:0])
+                        4'h2: next_state = STATE_READ_REGISTER_1;
+                        4'h3: next_state = STATE_WRITE_REGISTER_1;
+                        4'h4: next_state = STATE_TX_1;
+                        4'h5: next_state = STATE_RX_1;
+                        4'hf: next_state = STATE_RESET;
+                    endcase
+                end
+            end
+
+            STATE_READ_REGISTER_1:
+            begin
+                next_spi_tx_data = 0;
+
+                case (command[7:4])
+                    4'h1: next_spi_tx_data = { 1'b0, rx_error, rx_active, 1'b0, tx_complete, tx_active, 2'b0 };
+                    4'h2: next_spi_tx_data = control_register;
+                    4'hf: next_spi_tx_data = 8'ha5;
+                endcase
+
+                next_spi_tx_strobe = 1;
+
+                next_state = STATE_READ_REGISTER_2;
+            end
+
+            STATE_READ_REGISTER_2:
+            begin
+                if (spi_rx_strobe)
+                    next_state = STATE_READ_REGISTER_1;
+            end
+
+            STATE_WRITE_REGISTER_1:
+            begin
+                if (spi_rx_strobe)
+                begin
+                    next_register_mask = spi_rx_data;
+
+                    next_state = STATE_WRITE_REGISTER_2;
+                end
+            end
+
+            STATE_WRITE_REGISTER_2:
+            begin
+                if (spi_rx_strobe)
+                begin
+                    case (command[7:4])
+                        4'h2: next_control_register = (control_register & ~register_mask) | (spi_rx_data & register_mask);
+                    endcase
+
+                    next_state = STATE_IDLE;
+                end
+            end
+
+            STATE_TX_1:
+            begin
+                next_tx_complete = 0;
+                next_state = STATE_TX_2;
+            end
+
+            STATE_TX_2:
+            begin
+                if (spi_rx_strobe)
+                begin
+                    next_tx_data_valid = 0;
+
+                    if (tx_full)
+                    begin
+                        next_spi_tx_data = 8'b10000001; // Overflow
+                        next_spi_tx_strobe = 1;
+                    end
+                    else if (!tx_ready)
+                    begin
+                        next_spi_tx_data = 8'b10000010; // Underflow
+                        next_spi_tx_strobe = 1;
+                    end
+                    else
+                    begin
+                        next_tx_data = { spi_rx_data[1:0], 8'b00000000 };
+                        next_tx_data_valid = 1;
+
+                        next_spi_tx_data = 8'h00;
+                        next_spi_tx_strobe = 1;
+                    end
+
+                    next_state = STATE_TX_3;
+                end
+            end
+
+            STATE_TX_3:
+            begin
+                if (spi_rx_strobe)
+                begin
+                    next_tx_data = { tx_data[9:8], spi_rx_data };
+                    next_tx_load_strobe = tx_data_valid;
+
+                    next_state = STATE_TX_2;
+                end
+            end
+
+            STATE_RX_1:
+            begin
+                next_rx_buffer = { rx_error, rx_empty, 4'b0000, rx_data };
+
+                next_state = STATE_RX_2;
+            end
+
+            STATE_RX_2:
+            begin
+                next_spi_tx_data = rx_buffer[15:8];
+                next_spi_tx_strobe = 1;
+
+                next_state = STATE_RX_3;
+            end
+
+            STATE_RX_3:
+            begin
+                if (spi_rx_strobe)
+                begin
+                    next_spi_tx_data = rx_buffer[7:0];
+                    next_spi_tx_strobe = 1;
+
+                    // Reset on error and only dequeue if not empty.
+                    if (rx_buffer[15])
+                        next_rx_reset = 1; // TODO: should this be more explicit?
+                    else if (!rx_buffer[14])
+                        next_rx_read_strobe = 1;
+
+                    next_state = STATE_RX_4;
+                end
+            end
+
+            STATE_RX_4:
+            begin
+                if (spi_rx_strobe)
+                    next_state = STATE_RX_1;
+            end
+
+            STATE_RESET:
+            begin
+                // TODO: should this also reset the control register flags
+                // like loopback?
+
+                next_tx_reset = 1;
+                next_tx_complete = 0;
+
+                next_rx_reset = 1;
+
+                next_state = STATE_IDLE;
+            end
+        endcase
+
+        if (spi_cs_n_d[1])
+        begin
+            if (!tx_empty && !tx_active)
+                next_tx_start_strobe = 1; // TODO: this can last for multiple clock cycles, but that is okay...
+
+            next_state = STATE_IDLE;
+        end
+
+        if (!tx_active && previous_tx_active)
+            next_tx_complete = 1;
+    end
+
+    always @(posedge clk)
+    begin
+        state <= next_state;
+
+        control_register <= next_control_register;
+        register_mask <= next_register_mask;
+
+        command <= next_command;
+
+        spi_tx_data <= next_spi_tx_data;
+        spi_tx_strobe <= next_spi_tx_strobe;
+
+        tx_reset <= next_tx_reset;
+        tx_data <= next_tx_data;
+        tx_data_valid <= next_tx_data_valid;
+        tx_load_strobe <= next_tx_load_strobe;
+        tx_start_strobe <= next_tx_start_strobe;
+        tx_complete <= next_tx_complete;
+
+        rx_reset <= next_rx_reset;
+        rx_read_strobe <= next_rx_read_strobe;
+        rx_buffer <= next_rx_buffer;
+
+        if (reset)
+        begin
+            state <= STATE_IDLE;
+
+            control_register <= DEFAULT_CONTROL_REGISTER;
+
+            command <= 0;
+
+            spi_tx_data <= 0;
+            spi_tx_strobe <= 0;
+
+            tx_reset <= 0;
+            tx_data <= 0;
+            tx_load_strobe <= 0;
+            tx_start_strobe <= 0;
+            tx_complete <= 0;
+
+            rx_reset <= 0;
+            rx_read_strobe <= 0;
+            rx_buffer <= 0;
+        end
+
+        previous_tx_active <= tx_active;
+    end
+
+    assign loopback = control_register[0];
+
+    assign tx_parity = control_register[3];
+    assign rx_parity = control_register[6];
+endmodule

interface2/fpga/rtl/dual_clock_spi_device.v

@@ -0,0 +1,75 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module dual_clock_spi_device (
+    input clk_slow,
+    input clk_fast,
+    input spi_sck,
+    input spi_cs_n,
+    input spi_sdi,
+    output spi_sdo,
+    output reg [7:0] rx_data,
+    output reg rx_strobe,
+    input [7:0] tx_data,
+    input tx_strobe
+);
+    wire [7:0] rx_data_fast;
+    wire rx_strobe_fast;
+    reg [7:0] tx_data_fast;
+    wire tx_strobe_fast;
+
+    spi_device spi (
+        .clk(clk_fast),
+        .spi_sck(spi_sck),
+        .spi_cs_n(spi_cs_n),
+        .spi_sdi(spi_sdi),
+        .spi_sdo(spi_sdo),
+        .rx_data(rx_data_fast),
+        .rx_strobe(rx_strobe_fast),
+        .tx_data(tx_data_fast),
+        .tx_strobe(tx_strobe_fast)
+    );
+
+    wire rx_strobe_slow;
+
+    strobe_cdc rx_strobe_cdc (
+        .clk_in(clk_fast),
+        .strobe_in(rx_strobe_fast),
+        .clk_out(clk_slow),
+        .strobe_out(rx_strobe_slow)
+    );
+
+    strobe_cdc tx_strobe_cdc (
+        .clk_in(clk_slow),
+        .strobe_in(tx_strobe),
+        .clk_out(clk_fast),
+        .strobe_out(tx_strobe_fast)
+    );
+
+    always @(posedge clk_slow)
+    begin
+        if (tx_strobe)
+            tx_data_fast <= tx_data;
+
+        rx_strobe <= 0;
+
+        if (rx_strobe_slow)
+        begin
+            rx_data <= rx_data_fast;
+            rx_strobe <= 1;
+        end
+    end
+endmodule

interface2/fpga/rtl/icecube2.mk

@@ -0,0 +1,20 @@
+# See https://github.com/halfmanhalftaco/fpga-docker/tree/master/Lattice_iCEcube2
+ICECUBE2_WRAPPER = docker run -it --rm --volume $(RTL):/data --workdir /data --mac-address=$(shell cat .mac_address) icecube2:latest ./icecube2_env.sh
+
+RTL = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+IMPLMNT = coax_Implmnt
+
+all: top.bin
+
+$(IMPLMNT)/coax.edf: coax_syn.prj *.v third_party/*.v clocks.sdc
+	$(ICECUBE2_WRAPPER) synpwrap -prj coax_syn.prj
+
+top.bin: $(IMPLMNT)/coax.edf pins.pcf
+	rm -f top.bin
+	$(ICECUBE2_WRAPPER) ./icecube2_flow.tcl
+	cp $(IMPLMNT)/sbt/outputs/bitmap/top_bitmap.bin top.bin
+
+clean:
+	rm -rf $(IMPLMNT) synlog.tcl *.bin *.log *.log.bak
+
+.PHONY: all clean

interface2/fpga/rtl/icecube2_env.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+export ICECUBE_DIR="/opt/icecube2"
+export SBT_DIR="$ICECUBE_DIR/sbt_backend"
+
+export FOUNDRY="$ICECUBE_DIR/LSE"
+export SYNPLIFY_PATH="$ICECUBE_DIR/synpbase"
+export LM_LICENSE_FILE="$ICECUBE_DIR/license.dat"
+
+export LD_LIBRARY_PATH="$LD_LIBRARY_PATH${LD_LIBRARY_PATH:+:}$SBT_DIR/bin/linux/opt:$SBT_DIR/bin/linux/opt/synpwrap:$SBT_DIR/lib/linux/opt:$FOUNDRY/bin/lin64"
+
+# Give precedence to iCEcube2 tools.
+export PATH="$SBT_DIR/bin/linux/opt:$SBT_DIR/bin/linux/opt/synpwrap${PATH:+:}$PATH"
+
+$*

interface2/fpga/rtl/icecube2_flow.tcl

@@ -0,0 +1,6 @@
+#!/usr/bin/tclsh8.5
+
+# Place and route, bitmap generation and timing
+source [file join $::env(SBT_DIR) "tcl/sbt_backend_synpl.tcl"]
+
+run_sbt_backend_auto iCE40UP5K-SG48 top [pwd] coax_Implmnt ":edifparser -y pins.pcf" coax

interface2/fpga/rtl/pins.pcf

@@ -0,0 +1,25 @@
+set_io clk 37
+
+set_io reset_n 20
+
+# SPI
+set_io spi_sck 15
+
+set_io spi_cs_n 16
+set_io spi_sdi 17
+set_io spi_sdo 14
+
+# TX
+set_io tx_active 35
+set_io tx_n 36
+set_io tx_delay 34
+
+# RX
+set_io rx 26
+
+set_io irq 13
+
+set_io gpio0 46
+set_io gpio1 47
+set_io gpio2 48
+set_io gpio3 6

interface2/fpga/rtl/spi_device.v

@@ -0,0 +1,79 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module spi_device (
+    input clk,
+    input spi_sck,
+    input spi_cs_n,
+    input spi_sdi,
+    output spi_sdo,
+    output reg [7:0] rx_data,
+    output reg rx_strobe,
+    input [7:0] tx_data,
+    input tx_strobe
+);
+    reg [1:0] cs_n_d;
+    reg [2:0] sck_d;
+    reg [2:0] sdi_d;
+
+    always @(posedge clk)
+    begin
+        cs_n_d <= { cs_n_d[0], spi_cs_n };
+
+        sck_d <= { sck_d[1:0], spi_sck };
+        sdi_d <= { sdi_d[1:0], spi_sdi };
+    end
+
+    reg [3:0] counter;
+    reg [7:0] input_data;
+    reg [7:0] output_data;
+
+    always @(posedge clk)
+    begin
+        rx_strobe <= 0;
+
+        if (tx_strobe)
+            output_data <= tx_data;
+
+        if (cs_n_d[1])
+        begin
+            counter <= 0;
+        end
+        else
+        begin
+            if (!sck_d[2] && sck_d[1])
+            begin
+                input_data <= { input_data[6:0], sdi_d[2] };
+                counter <= counter + 1;
+            end
+
+            if (sck_d[2] && !sck_d[1])
+            begin
+                output_data <= { output_data[6:0], 1'b0 };
+
+                if (counter == 8)
+                begin
+                    rx_data <= input_data;
+                    rx_strobe <= 1;
+
+                    counter <= 0;
+                end
+            end
+        end
+    end
+
+    assign spi_sdo = output_data[7];
+endmodule

interface2/fpga/rtl/strobe_cdc.v

@@ -0,0 +1,42 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module strobe_cdc (
+    input clk_in,
+    input strobe_in,
+    input clk_out,
+    output reg strobe_out
+);
+    reg toggle_in;
+
+    always @(posedge clk_in)
+    begin
+        if (strobe_in)
+            toggle_in <= ~toggle_in;
+    end
+
+    reg [2:0] toggle_out;
+
+    always @(posedge clk_out)
+    begin
+        toggle_out <= { toggle_out[1:0], toggle_in };
+
+        strobe_out <= 0;
+
+        if (toggle_out[2] != toggle_out[1])
+            strobe_out <= 1;
+    end
+endmodule

interface2/fpga/rtl/third_party/fifo_sync_ram.v

@@ -0,0 +1,161 @@
+// https://raw.githubusercontent.com/smunaut/ice40-playground/68ac87f6c458712a41d5b8e305d222849233ff00/cores/misc/rtl/fifo_sync_ram.v
+
+/*
+ * fifo_sync_ram.v
+ *
+ * vim: ts=4 sw=4
+ *
+ * Copyright (C) 2019  Sylvain Munaut <tnt@246tNt.com>
+ * All rights reserved.
+ *
+ * BSD 3-clause, see LICENSE.bsd
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the <organization> nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+`default_nettype none
+
+module fifo_sync_ram #(
+	parameter integer DEPTH = 256,
+	parameter integer WIDTH = 16
+)(
+	input  wire [WIDTH-1:0] wr_data,
+	input  wire wr_ena,
+	output wire wr_full,
+
+	output wire [WIDTH-1:0] rd_data,
+	input  wire rd_ena,
+	output wire rd_empty,
+
+	input  wire clk,
+	input  wire rst
+);
+
+	localparam AWIDTH = $clog2(DEPTH);
+
+
+	// Signals
+	// -------
+
+	// RAM
+	reg  [AWIDTH-1:0] ram_wr_addr;
+	wire [ WIDTH-1:0] ram_wr_data;
+	wire ram_wr_ena;
+
+	reg  [AWIDTH-1:0] ram_rd_addr;
+	wire [ WIDTH-1:0] ram_rd_data;
+	wire ram_rd_ena;
+
+	// Fill-level
+	reg  [AWIDTH:0] level;
+	(* keep="true" *) wire lvl_dec;
+	(* keep="true" *) wire lvl_mov;
+	wire lvl_empty;
+
+	// Full
+	wire full_nxt;
+	reg  full;
+
+	// Read logic
+	reg  rd_valid;
+
+
+	// Fill level counter
+	// ------------------
+	// (counts the number of used words - 1)
+
+	always @(posedge clk or posedge rst)
+		if (rst)
+			level <= {(AWIDTH+1){1'b1}};
+		else
+			level <= level + { {AWIDTH{lvl_dec}}, lvl_mov };
+
+	assign lvl_dec = ram_rd_ena & ~ram_wr_ena;
+	assign lvl_mov = ram_rd_ena ^  ram_wr_ena;
+	assign lvl_empty = level[AWIDTH];
+
+
+	// Full flag generation
+	// --------------------
+
+	assign full_nxt = level == { 1'b0, {(AWIDTH-2){1'b1}}, 2'b01 };
+
+	always @(posedge clk or posedge rst)
+		if (rst)
+			full <= 1'b0;
+		else
+			full <= (full | (wr_ena & ~rd_ena & full_nxt)) & ~(rd_ena & ~wr_ena);
+
+	assign wr_full = full;
+
+
+	// Write
+	// -----
+
+	always @(posedge clk or posedge rst)
+		if (rst)
+			ram_wr_addr <= 0;
+		else if (ram_wr_ena)
+			ram_wr_addr <= ram_wr_addr + 1;
+
+	assign ram_wr_data = wr_data;
+	assign ram_wr_ena  = wr_ena;
+
+
+	// Read
+	// ----
+
+	always @(posedge clk or posedge rst)
+		if (rst)
+			ram_rd_addr <= 0;
+		else if (ram_rd_ena)
+			ram_rd_addr <= ram_rd_addr + 1;
+
+	assign ram_rd_ena = (rd_ena | ~rd_valid) & ~lvl_empty;
+
+	always @(posedge clk or posedge rst)
+		if (rst)
+			rd_valid <= 1'b0;
+		else if (rd_ena | ~rd_valid)
+			rd_valid <= ~lvl_empty;
+
+	assign rd_data = ram_rd_data;
+	assign rd_empty = ~rd_valid;
+
+
+	// RAM
+	// ---
+
+	ram_sdp #(
+		.AWIDTH(AWIDTH),
+		.DWIDTH(WIDTH)
+	) ram_I (
+		.wr_addr(ram_wr_addr),
+		.wr_data(ram_wr_data),
+		.wr_ena(ram_wr_ena),
+		.rd_addr(ram_rd_addr),
+		.rd_data(ram_rd_data),
+		.rd_ena(ram_rd_ena),
+		.clk(clk)
+	);
+endmodule // fifo_sync_ram

interface2/fpga/rtl/third_party/ram_sdp.v

@@ -0,0 +1,73 @@
+// https://raw.githubusercontent.com/smunaut/ice40-playground/68ac87f6c458712a41d5b8e305d222849233ff00/cores/misc/rtl/ram_sdp.v
+
+/*
+ * ram_sdp.v
+ *
+ * vim: ts=4 sw=4
+ *
+ * Copyright (C) 2019  Sylvain Munaut <tnt@246tNt.com>
+ * All rights reserved.
+ *
+ * BSD 3-clause, see LICENSE.bsd
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the <organization> nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+`default_nettype none
+
+module ram_sdp #(
+	parameter integer AWIDTH = 9,
+	parameter integer DWIDTH = 8
+)(
+	input  wire [AWIDTH-1:0] wr_addr,
+	input  wire [DWIDTH-1:0] wr_data,
+	input  wire wr_ena,
+
+	input  wire [AWIDTH-1:0] rd_addr,
+	output reg  [DWIDTH-1:0] rd_data,
+	input  wire rd_ena,
+
+	input  wire clk
+);
+	// Signals
+	reg [DWIDTH-1:0] ram [(1<<AWIDTH)-1:0];
+
+`ifdef SIM
+	integer i;
+	initial
+		for (i=0; i<(1<<AWIDTH); i=i+1)
+			ram[i] = 0;
+`endif
+
+	always @(posedge clk)
+	begin
+		// Read
+		if (rd_ena)
+			rd_data <= ram[rd_addr];
+
+		// Write
+		if (wr_ena)
+			ram[wr_addr] <= wr_data;
+	end
+
+endmodule // ram_sdp

interface2/fpga/rtl/top.v

@@ -0,0 +1,201 @@
+// Copyright (c) 2020, Andrew Kay
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+`default_nettype none
+
+module top (
+    input clk,
+
+    input reset_n,
+
+    // SPI
+    input spi_sck,
+    input spi_cs_n,
+    input spi_sdi,
+    output spi_sdo,
+
+    // TX
+    output tx_active,
+    output tx_n,
+    output tx_delay,
+
+    // RX
+    input rx,
+
+    output irq,
+
+    output gpio0,
+    output gpio1,
+    output gpio2,
+    output gpio3
+);
+    reg [1:0] reset_n_d;
+    reg [1:0] rx_d;
+
+    always @(posedge clk)
+    begin
+        reset_n_d <= { reset_n_d[0], reset_n };
+        rx_d <= { rx_d[0], rx };
+    end
+
+    reg reset;
+
+    always @(posedge clk)
+    begin
+        reset <= !reset_n_d[1];
+    end
+
+    wire clk_fast;
+
+    SB_PLL40_CORE #(
+        .FEEDBACK_PATH("SIMPLE"),
+        .DIVR(4'b0000),
+        .DIVF(7'b0010000),
+        .DIVQ(3'b011),
+        .FILTER_RANGE(3'b011)
+    ) clk_fast_pll (
+        .RESETB(1'b1),
+        .BYPASS(1'b0),
+        .REFERENCECLK(clk),
+        .PLLOUTCORE(clk_fast)
+    );
+
+    wire [7:0] spi_rx_data;
+    wire spi_rx_strobe;
+    wire [7:0] spi_tx_data;
+    wire spi_tx_strobe;
+
+    dual_clock_spi_device spi (
+        .clk_slow(clk),
+        .clk_fast(clk_fast),
+        .spi_sck(spi_sck),
+        .spi_cs_n(spi_cs_n),
+        .spi_sdi(spi_sdi),
+        .spi_sdo(spi_sdo),
+        .rx_data(spi_rx_data),
+        .rx_strobe(spi_rx_strobe),
+        .tx_data(spi_tx_data),
+        .tx_strobe(spi_tx_strobe)
+    );
+
+    wire loopback;
+
+    wire tx_reset;
+    wire internal_tx_active;
+    wire internal_tx;
+    wire [9:0] tx_data;
+    wire tx_load_strobe;
+    wire tx_start_strobe;
+    wire tx_empty;
+    wire tx_full;
+    wire tx_ready;
+    wire tx_parity;
+
+    coax_buffered_tx #(
+        .CLOCKS_PER_BIT(16),
+        .DEPTH(2048),
+        .START_DEPTH(1536)
+    ) coax_buffered_tx (
+        .clk(clk),
+        .reset(reset || tx_reset),
+        .active(internal_tx_active),
+        .tx(internal_tx),
+        .data(tx_data),
+        .load_strobe(tx_load_strobe),
+        .start_strobe(tx_start_strobe),
+        .empty(tx_empty),
+        .full(tx_full),
+        .ready(tx_ready),
+        .parity(tx_parity)
+    );
+
+    reg internal_rx;
+
+    always @(posedge clk)
+    begin
+        internal_rx <= loopback ? internal_tx : (!internal_tx_active ? rx_d[1] : 0);
+    end
+
+    wire rx_reset;
+    wire rx_active;
+    wire rx_error;
+    wire [9:0] rx_data;
+    wire rx_read_strobe;
+    wire rx_empty;
+    wire rx_parity;
+
+    coax_buffered_rx #(
+        .CLOCKS_PER_BIT(16),
+        .DEPTH(2048)
+    ) coax_buffered_rx (
+        .clk(clk),
+        .reset(reset || rx_reset),
+        .rx(internal_rx),
+        .active(rx_active),
+        .error(rx_error),
+        .data(rx_data),
+        .read_strobe(rx_read_strobe),
+        .empty(rx_empty),
+        .parity(rx_parity)
+    );
+
+    control control (
+        .clk(clk),
+        .reset(reset),
+
+        .spi_cs_n(spi_cs_n),
+        .spi_rx_data(spi_rx_data),
+        .spi_rx_strobe(spi_rx_strobe),
+        .spi_tx_data(spi_tx_data),
+        .spi_tx_strobe(spi_tx_strobe),
+
+        .loopback(loopback),
+
+        .tx_reset(tx_reset),
+        .tx_active(internal_tx_active),
+        .tx_data(tx_data),
+        .tx_load_strobe(tx_load_strobe),
+        .tx_start_strobe(tx_start_strobe),
+        .tx_empty(tx_empty),
+        .tx_full(tx_full),
+        .tx_ready(tx_ready),
+        .tx_parity(tx_parity),
+
+        .rx_reset(rx_reset),
+        .rx_active(rx_active),
+        .rx_error(rx_error),
+        .rx_data(rx_data),
+        .rx_read_strobe(rx_read_strobe),
+        .rx_empty(rx_empty),
+        .rx_parity(rx_parity)
+    );
+
+    coax_tx_distorter #(
+        .CLOCKS_PER_BIT(16)
+    ) coax_tx_distorter (
+        .clk(clk),
+        .active_input(!loopback && internal_tx_active),
+        .tx_input(internal_tx),
+        .active_output(tx_active),
+        .tx_delay(tx_delay),
+        .tx_n(tx_n)
+    );
+
+    assign irq = rx_active || rx_error;
+
+    assign gpio0 = rx_d[1];
+    assign gpio1 = tx_active;
+    assign gpio2 = rx_active;
+    assign gpio3 = 0;
+endmodule

interface2/fpga/tests/.gitignore

@@ -0,0 +1,2 @@
+*_tb
+*.vcd

interface2/fpga/tests/Makefile

@@ -0,0 +1,27 @@
+IVERILOG ?= iverilog
+
+RTL = ../rtl
+TESTS = $(patsubst %.v,%,$(wildcard *_tb.v))
+
+all: test
+
+coax_buffer_tb: coax_buffer_tb.v $(RTL)/coax_buffer.v $(RTL)/third_party/*.v
+coax_buffered_rx_tb: coax_buffered_rx_tb.v $(RTL)/coax_buffered_rx.v $(RTL)/coax_rx.v $(RTL)/coax_rx_bit_timer.v $(RTL)/coax_buffer.v $(RTL)/third_party/*.v
+coax_buffered_tx_tb: coax_buffered_tx_tb.v $(RTL)/coax_buffered_tx.v $(RTL)/coax_tx.v $(RTL)/coax_tx_bit_timer.v $(RTL)/coax_buffer.v $(RTL)/third_party/*.v
+coax_rx_bit_timer_tb: coax_rx_bit_timer_tb.v $(RTL)/coax_rx_bit_timer.v
+coax_rx_tb: coax_rx_tb.v $(RTL)/coax_rx.v $(RTL)/coax_rx_bit_timer.v
+coax_tx_bit_timer_tb: coax_tx_bit_timer_tb.v $(RTL)/coax_tx_bit_timer.v
+coax_tx_distorter_tb: coax_tx_distorter_tb.v $(RTL)/coax_tx_distorter.v
+coax_tx_tb: coax_tx_tb.v $(RTL)/coax_tx.v $(RTL)/coax_tx_bit_timer.v
+control_tb: control_tb.v $(RTL)/control.v $(RTL)/coax_buffered_tx.v $(RTL)/coax_tx.v $(RTL)/coax_tx_bit_timer.v $(RTL)/coax_buffer.v $(RTL)/third_party/*.v
+
+test: $(TESTS)
+	$(foreach tb,$(TESTS),./run_test.sh $(tb);)
+
+clean:
+	rm -f *_tb *.vcd
+
+%_tb:
+	$(IVERILOG) -o $@ $^
+
+.PHONY: all, clean

interface2/fpga/tests/assert.v

@@ -0,0 +1,14 @@
+`define assert_equal(actual, expected, message) \
+    if ((actual) !== expected) \
+    begin \
+        $display("[ASSERTION FAILURE] %m (%s:%0d): %s", `__FILE__, `__LINE__, message); \
+        $display("\tTime:     %0t", $time); \
+        $display("\tExpected: %x", expected); \
+        $display("\tActual:   %x", actual); \
+    end
+
+`define assert_high(actual, message) \
+    `assert_equal(actual, 1, message)
+
+`define assert_low(actual, message) \
+    `assert_equal(actual, 0, message)

interface2/fpga/tests/coax_buffer_tb.v

@@ -0,0 +1,90 @@
+`default_nettype none
+
+`include "assert.v"
+
+module coax_buffer_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    reg reset = 0;
+    reg [9:0] write_data = 0;
+    reg write_strobe = 0;
+    reg read_strobe = 0;
+
+    coax_buffer #(
+        .DEPTH(16),
+        .ALMOST_EMPTY_THRESHOLD(4),
+        .ALMOST_FULL_THRESHOLD(12)
+    ) dut (
+        .clk(clk),
+        .reset(reset),
+        .write_data(write_data),
+        .write_strobe(write_strobe),
+        .read_strobe(read_strobe)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_buffer_tb.vcd");
+        $dumpvars(0, coax_buffer_tb);
+
+        test_1;
+
+        $finish;
+    end
+
+    task test_1;
+    begin
+        $display("START: test_1");
+
+        write_data = 0;
+        write_strobe = 0;
+        read_strobe = 0;
+
+        dut_reset;
+
+        #16;
+
+        repeat (16)
+        begin
+            write_strobe = 1;
+            #2;
+            write_strobe = 0;
+
+            #2;
+
+            write_data = write_data + 1;
+        end
+
+        #16;
+
+        repeat (16)
+        begin
+            read_strobe = 1;
+            #2;
+            read_strobe = 0;
+
+            #2;
+        end
+
+        #64;
+
+        $display("END: test_1");
+    end
+    endtask
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/coax_buffered_rx_tb.v

@@ -0,0 +1,169 @@
+`default_nettype none
+
+`include "assert.v"
+`include "mock_tx.v"
+
+module coax_buffered_rx_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    wire rx;
+
+    mock_tx mock_tx (
+        .tx(rx)
+    );
+
+    reg reset = 0;
+    reg read_strobe = 0;
+
+    coax_buffered_rx #(
+        .CLOCKS_PER_BIT(8),
+        .DEPTH(8)
+    ) dut (
+        .clk(clk),
+        .reset(reset),
+        .rx(rx),
+        .read_strobe(read_strobe),
+        .parity(1'b1)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_buffered_rx_tb.vcd");
+        $dumpvars(0, coax_buffered_rx_tb);
+
+        test_1;
+        test_2;
+        test_3;
+
+        $finish;
+    end
+
+    task test_1;
+    begin
+        $display("START: test_1");
+
+        dut_reset;
+
+        #2;
+
+        mock_tx.tx_start_sequence;
+
+        mock_tx.tx_word(10'b0000000001, 0);
+        mock_tx.tx_word(10'b0000000010, 0);
+        mock_tx.tx_word(10'b0000000011, 1);
+        mock_tx.tx_word(10'b0000000100, 0);
+        mock_tx.tx_word(10'b0000000101, 1);
+        mock_tx.tx_word(10'b0000000110, 1);
+        mock_tx.tx_word(10'b0000000111, 0);
+        mock_tx.tx_word(10'b0000001000, 0);
+
+        mock_tx.tx_end_sequence;
+
+        #8;
+
+        `assert_high(dut.full, "full should be HIGH");
+        `assert_low(dut.empty, "empty should be LOW");
+
+        `assert_low(dut.error, "error should be LOW");
+
+        repeat (8)
+        begin
+            read_strobe = 1;
+            #2;
+            read_strobe = 0;
+
+            #8;
+        end
+
+        `assert_low(dut.full, "full should be LOW");
+        `assert_high(dut.empty, "empty should be HIGH");
+
+        #64;
+
+        $display("END: test_1");
+    end
+    endtask
+
+    task test_2;
+    begin
+        $display("START: test_2");
+
+        dut_reset;
+
+        #2;
+
+        mock_tx.tx_start_sequence;
+
+        mock_tx.tx_word(10'b0000000001, 0);
+        mock_tx.tx_word(10'b0000000010, 0);
+        mock_tx.tx_word(10'b0000000011, 1);
+        mock_tx.tx_word(10'b0000000100, 0);
+
+        mock_tx.tx_end_sequence;
+
+        #8;
+
+        `assert_low(dut.error, "error should be LOW");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_word(10'b0000000101, 1);
+        mock_tx.tx_end_sequence;
+
+        #8;
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_OVERFLOW, "error should be ERROR_OVERFLOW");
+
+        #64;
+
+        $display("END: test_2");
+    end
+    endtask
+
+    task test_3;
+    begin
+        $display("START: test_3");
+
+        dut_reset;
+
+        #2;
+
+        mock_tx.tx_start_sequence;
+
+        repeat (9)
+        begin
+            mock_tx.tx_word(10'b0000000000, 1);
+        end
+
+        mock_tx.tx_end_sequence;
+
+        #8;
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_OVERFLOW, "error should be ERROR_OVERFLOW");
+
+        `assert_high(dut.full, "full should be HIGH");
+        `assert_low(dut.empty, "empty should be LOW");
+
+        #64;
+
+        $display("END: test_3");
+    end
+    endtask
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/coax_buffered_tx_tb.v

@@ -0,0 +1,138 @@
+`default_nettype none
+
+`include "assert.v"
+
+module coax_buffered_tx_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    reg reset = 0;
+    reg [9:0] data;
+    reg load_strobe = 0;
+    reg start_strobe = 0;
+
+    coax_buffered_tx #(
+        .CLOCKS_PER_BIT(8),
+        .DEPTH(8),
+        .START_DEPTH(4)
+    ) dut (
+        .clk(clk),
+        .reset(reset),
+        .data(data),
+        .load_strobe(load_strobe),
+        .start_strobe(start_strobe),
+        .parity(1'b1)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_buffered_tx_tb.vcd");
+        $dumpvars(0, coax_buffered_tx_tb);
+
+        test_1;
+        test_2;
+
+        $finish;
+    end
+
+    task test_1;
+    begin
+        $display("START: test_1");
+
+        dut_reset;
+
+        #8;
+
+        data = 10'b0101110101;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        data = 10'b1010001110;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        data = 10'b0101110101;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        start_strobe = 1;
+        #2;
+        start_strobe = 0;
+
+        #1000;
+
+        $display("END: test_1");
+    end
+    endtask
+
+    task test_2;
+    begin
+        $display("START: test_2");
+
+        dut_reset;
+
+        #8;
+
+        data = 10'b0101110101;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        data = 10'b1010001110;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        data = 10'b0101110101;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        data = 10'b1010001110;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #8;
+
+        data = 10'b0101110101;
+        load_strobe = 1;
+        #2;
+        load_strobe = 0;
+
+        #1200;
+
+        $display("END: test_2");
+    end
+    endtask
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/coax_rx_bit_timer_tb.v

@@ -0,0 +1,75 @@
+`default_nettype none
+
+`include "mock_tx.v"
+
+module coax_rx_bit_timer_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    wire rx;
+
+    mock_tx mock_tx (
+        .tx(rx)
+    );
+
+    reg reset = 0;
+    wire sample;
+    wire synchronized;
+
+    coax_rx_bit_timer #(
+        .CLOCKS_PER_BIT(8)
+    ) dut (
+        .clk(clk),
+        .rx(rx),
+        .reset(reset),
+        .sample(sample),
+        .synchronized(synchronized)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_rx_bit_timer_tb.vcd");
+        $dumpvars(0, coax_rx_bit_timer_tb);
+
+        // Idle
+        #32;
+
+        // Perfect
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+
+        // Delayed
+        mock_tx.tx_bit_custom(0, 9, 8);
+
+        // Shortened
+        mock_tx.tx_bit_custom(0, 6, 7);
+
+        // Stuck
+        mock_tx.tx_bit_custom(1, 24, 8);
+
+        // Reset
+        dut_reset;
+
+        mock_tx.tx_bit(1);
+
+        #32;
+
+        $finish;
+    end
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/coax_rx_tb.v

@@ -0,0 +1,492 @@
+`default_nettype none
+
+`include "assert.v"
+`include "mock_tx.v"
+
+module coax_rx_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    wire rx;
+
+    mock_tx mock_tx (
+        .tx(rx)
+    );
+
+    reg reset = 0;
+
+    coax_rx #(
+        .CLOCKS_PER_BIT(8)
+    ) dut (
+        .clk(clk),
+        .reset(reset),
+        .rx(rx),
+        .parity(1'b1)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_rx_tb.vcd");
+        $dumpvars(0, coax_rx_tb);
+
+        test_1;
+        test_2;
+        test_3;
+        test_4;
+        test_5;
+        test_6;
+        test_7;
+        test_8;
+        test_9;
+        test_10;
+        test_11;
+        test_12;
+        test_13;
+        test_14;
+        test_15;
+        test_16;
+
+        $finish;
+    end
+
+    task test_1;
+    begin
+        $display("START: test_1");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        dut_reset;
+
+        #8;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_1");
+    end
+    endtask
+
+    task test_2;
+    begin
+        $display("START: test_2");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_2");
+    end
+    endtask
+
+    task test_3;
+    begin
+        $display("START: test_3");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+        #16;
+        mock_tx.tx_set(0);
+
+        mock_tx.tx_bit(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_3");
+    end
+    endtask
+
+    task test_4;
+    begin
+        $display("START: test_4");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+        #16;
+        mock_tx.tx_set(0);
+
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_4");
+    end
+    endtask
+
+    task test_5;
+    begin
+        $display("START: test_5");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+        #16;
+        mock_tx.tx_set(0);
+
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_5");
+    end
+    endtask
+
+    task test_6;
+    begin
+        $display("START: test_6");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+        #16;
+        mock_tx.tx_set(0);
+
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_6");
+    end
+    endtask
+
+    task test_7;
+    begin
+        $display("START: test_7");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+        #16;
+        mock_tx.tx_set(0);
+
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_7");
+    end
+    endtask
+
+    task test_8;
+    begin
+        $display("START: test_8");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(1);
+        #16;
+        mock_tx.tx_set(0);
+
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+
+        mock_tx.tx_set(0);
+        #24;
+        mock_tx.tx_set(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_set(0);
+
+        $display("END: test_8");
+    end
+    endtask
+
+    task test_9;
+    begin
+        $display("START: test_9");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+
+        mock_tx.tx_set(0);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_9");
+    end
+    endtask
+
+    task test_10;
+    begin
+        $display("START: test_10");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_ERROR, "State should be STATE_ERROR");
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_LOSS_OF_MID_BIT_TRANSITION, "data should be ERROR_LOSS_OF_MID_BIT_TRANSITION");
+
+        dut_reset;
+
+        #16;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_10");
+    end
+    endtask
+
+    task test_11;
+    begin
+        $display("START: test_11");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+        mock_tx.tx_bit(0); // MSB DATA_BIT
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_ERROR, "State should be STATE_ERROR");
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_LOSS_OF_MID_BIT_TRANSITION, "data should be ERROR_LOSS_OF_MID_BIT_TRANSITION");
+
+        dut_reset;
+
+        #16;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_11");
+    end
+    endtask
+
+    task test_12;
+    begin
+        $display("START: test_12");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+        mock_tx.tx_bit(0); // MSB DATA_BIT
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1); // LSB DATA_BIT
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_ERROR, "State should be STATE_ERROR");
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_LOSS_OF_MID_BIT_TRANSITION, "data should be ERROR_LOSS_OF_MID_BIT_TRANSITION");
+
+        dut_reset;
+
+        #16;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_12");
+    end
+    endtask
+
+    task test_13;
+    begin
+        $display("START: test_13");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+        mock_tx.tx_bit(0); // MSB DATA_BIT
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1); // LSB DATA_BIT
+        mock_tx.tx_bit(0); // PARITY_BIT
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_ERROR, "State should be STATE_ERROR");
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_PARITY, "data should be ERROR_PARITY");
+
+        dut_reset;
+
+        #16;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_13");
+    end
+    endtask
+
+    task test_14;
+    begin
+        $display("START: test_14");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+        mock_tx.tx_bit(0); // MSB DATA_BIT
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1); // LSB DATA_BIT
+        mock_tx.tx_bit(1); // PARITY_BIT
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_ERROR, "State should be STATE_ERROR");
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_LOSS_OF_MID_BIT_TRANSITION, "data should be ERROR_LOSS_OF_MID_BIT_TRANSITION");
+
+        dut_reset;
+
+        #16;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_14");
+    end
+    endtask
+
+    task test_15;
+    begin
+        $display("START: test_15");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+        mock_tx.tx_bit(0); // MSB DATA_BIT
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1); // LSB DATA_BIT
+        mock_tx.tx_bit(1); // PARITY_BIT
+        mock_tx.tx_bit(0);
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_ERROR, "State should be STATE_ERROR");
+
+        `assert_high(dut.error, "error should be HIGH");
+        `assert_equal(dut.data, dut.ERROR_INVALID_END_SEQUENCE, "data should be INVALID_END_SEQUENCE_STATE_ERROR");
+
+        dut_reset;
+
+        #16;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        $display("END: test_15");
+    end
+    endtask
+
+    task test_16;
+    begin
+        $display("START: test_16");
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        mock_tx.tx_start_sequence;
+        mock_tx.tx_bit(1); // SYNC_BIT
+        mock_tx.tx_bit(0); // MSB DATA_BIT
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(0);
+        mock_tx.tx_bit(1);
+        mock_tx.tx_bit(1); // LSB DATA_BIT
+        mock_tx.tx_bit(1); // PARITY_BIT
+        mock_tx.tx_end_sequence;
+
+        #64;
+
+        `assert_equal(dut.state, dut.STATE_IDLE, "state should be STATE_IDLE");
+
+        `assert_equal(dut.data, 10'b0110110011, "data not correct")
+
+        $display("END: test_16");
+    end
+    endtask
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/coax_tx_bit_timer_tb.v

@@ -0,0 +1,38 @@
+`default_nettype none
+
+module coax_tx_bit_timer_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    reg reset = 0;
+    wire first_half;
+    wire second_half;
+    wire last_clock;
+
+    coax_tx_bit_timer #(
+        .CLOCKS_PER_BIT(8)
+    ) dut (
+        .clk(clk),
+        .reset(reset),
+        .first_half(first_half),
+        .second_half(second_half),
+        .last_clock(last_clock)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_tx_bit_timer_tb.vcd");
+        $dumpvars(0, coax_tx_bit_timer_tb);
+
+        #64;
+
+        $finish;
+    end
+endmodule

interface2/fpga/tests/coax_tx_distorter_tb.v

@@ -0,0 +1,54 @@
+`default_nettype none
+
+module coax_tx_distorter_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    reg active_input = 0;
+    reg tx_input = 0;
+
+    coax_tx_distorter #(
+        .CLOCKS_PER_BIT(8)
+    ) dut (
+        .clk(clk),
+        .active_input(active_input),
+        .tx_input(tx_input)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_tx_distorter_tb.vcd");
+        $dumpvars(0, coax_tx_distorter_tb);
+
+        #16;
+
+        active_input = 1;
+
+        tx_input = 1;
+        #8;
+
+        tx_input = 0;
+        #8;
+        tx_input = 1;
+        #8;
+
+        tx_input = 0;
+        #8;
+        tx_input = 1;
+        #8;
+        tx_input = 0;
+
+        active_input = 0;
+
+        #32;
+
+        $finish;
+    end
+endmodule

interface2/fpga/tests/coax_tx_tb.v

@@ -0,0 +1,113 @@
+`default_nettype none
+
+`include "assert.v"
+
+module coax_tx_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    reg reset = 0;
+    reg [9:0] data;
+    reg strobe = 0;
+
+    coax_tx #(
+        .CLOCKS_PER_BIT(8)
+    ) dut (
+        .clk(clk),
+        .reset(reset),
+        .data(data),
+        .strobe(strobe),
+        .parity(1'b1)
+    );
+
+    initial
+    begin
+        $dumpfile("coax_tx_tb.vcd");
+        $dumpvars(0, coax_tx_tb);
+
+        test_1;
+        test_2;
+        test_3;
+
+        $finish;
+    end
+
+    task test_1;
+    begin
+        $display("START: test_1");
+
+        `assert_equal(dut.state, dut.IDLE, "state should be IDLE");
+
+        dut_reset;
+
+        #8;
+
+        `assert_equal(dut.state, dut.IDLE, "state should be IDLE");
+
+        $display("END: test_1");
+    end
+    endtask
+
+    task test_2;
+    begin
+        $display("START: test_2");
+
+        `assert_equal(dut.state, dut.IDLE, "state should be IDLE");
+
+        data = 10'b0101110101;
+
+        strobe = 1;
+        #2;
+        strobe = 0;
+
+        #400;
+
+        `assert_equal(dut.state, dut.IDLE, "state should be IDLE");
+
+        $display("END: test_2");
+    end
+    endtask
+
+    task test_3;
+    begin
+        $display("START: test_3");
+
+        `assert_equal(dut.state, dut.IDLE, "state should be IDLE");
+
+        data = 10'b0101110101;
+
+        strobe = 1;
+        #2;
+        strobe = 0;
+
+        #330;
+
+        data = 10'b1010001110;
+
+        strobe = 1;
+        #2;
+        strobe = 0;
+
+        #600;
+
+        `assert_equal(dut.state, dut.IDLE, "state should be IDLE");
+
+        $display("END: test_3");
+    end
+    endtask
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/control_tb.v

@@ -0,0 +1,186 @@
+`default_nettype none
+
+`include "assert.v"
+
+module control_tb;
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    reg reset = 0;
+
+    reg spi_cs_n = 1;
+    reg [7:0] spi_rx_data;
+    reg spi_rx_strobe = 0;
+
+    wire tx_reset;
+    wire tx_active;
+    wire [9:0] tx_data;
+    wire tx_load_strobe;
+    wire tx_start_strobe;
+    wire tx_empty;
+    wire tx_full;
+    wire tx_ready;
+
+    coax_buffered_tx #(
+        .CLOCKS_PER_BIT(8),
+        .DEPTH(8)
+    ) coax_buffered_tx (
+        .clk(clk),
+        .reset(reset),
+        .active(tx_active),
+        .data(tx_data),
+        .load_strobe(tx_load_strobe),
+        .start_strobe(tx_start_strobe),
+        .empty(tx_empty),
+        .full(tx_full),
+        .ready(tx_ready)
+    );
+
+    reg rx_active = 0;
+    reg rx_error = 0;
+    reg [9:0] rx_data = 0;
+    reg rx_empty = 1;
+
+    control dut (
+        .clk(clk),
+        .reset(reset),
+
+        .spi_cs_n(spi_cs_n),
+        .spi_rx_data(spi_rx_data),
+        .spi_rx_strobe(spi_rx_strobe),
+
+        .tx_reset(tx_reset),
+        .tx_active(tx_active),
+        .tx_data(tx_data),
+        .tx_load_strobe(tx_load_strobe),
+        .tx_start_strobe(tx_start_strobe),
+        .tx_empty(tx_empty),
+        .tx_full(tx_full),
+        .tx_ready(tx_ready),
+
+        .rx_active(rx_active),
+        .rx_error(rx_error),
+        .rx_data(rx_data),
+        .rx_empty(rx_empty)
+    );
+
+    initial
+    begin
+        $dumpfile("control_tb.vcd");
+        $dumpvars(0, control_tb);
+
+        test_1;
+        test_2;
+
+        $finish;
+    end
+
+    task test_1;
+    begin
+        $display("START: test_1");
+
+        dut_reset;
+
+        #2;
+
+        rx_data = 10'b1111111111;
+        rx_empty = 0;
+
+        spi_cs_n = 0;
+
+        spi_send(8'h05); // RX
+
+        #16;
+
+        spi_send(8'h00);
+
+        #16;
+
+        rx_data = 10'b0000000000;
+        rx_empty = 1;
+
+        spi_send(8'h00);
+
+        #16;
+
+        repeat (8)
+        begin
+            spi_send(8'h00);
+
+            #16;
+
+            spi_send(8'h00);
+
+            #16;
+        end
+
+        spi_cs_n = 1;
+
+        #64;
+
+        $display("END: test_1");
+    end
+    endtask
+
+    task test_2;
+    begin
+        $display("START: test_2");
+
+        dut_reset;
+
+        #2;
+
+        spi_cs_n = 0;
+
+        spi_send(8'h04); // TX
+
+        #16;
+
+        spi_send(8'b00000011);
+
+        #16;
+
+        spi_send(8'b11111111);
+
+        #16;
+
+        #16;
+
+        spi_cs_n = 1;
+
+        #500;
+
+        dut_reset;
+
+        #20;
+
+        $display("END: test_2");
+    end
+    endtask
+
+    task dut_reset;
+    begin
+        reset = 1;
+        #2;
+        reset = 0;
+    end
+    endtask
+
+    task spi_send (
+        input [7:0] data
+    );
+    begin
+        spi_rx_data = data;
+        spi_rx_strobe = 1;
+        #2;
+        spi_rx_strobe = 0;
+    end
+    endtask
+endmodule

interface2/fpga/tests/mock_tx.v

@@ -0,0 +1,86 @@
+module mock_tx (
+    output reg tx = 0
+);
+    task tx_bit (
+        input bit
+    );
+    begin
+        tx_bit_custom(bit, 8, 8);
+    end
+    endtask
+
+    task tx_start_sequence;
+    begin
+        tx = 0;
+        #16;
+        tx = 1;
+        #16;
+        tx = 0;
+
+        tx_bit(1);
+        tx_bit(1);
+        tx_bit(1);
+        tx_bit(1);
+        tx_bit(1);
+
+        tx = 0;
+        #24;
+        tx = 1;
+        #24;
+    end
+    endtask
+
+    task tx_word (
+        input [9:0] data,
+        input parity
+    );
+    begin
+        tx_bit(1);
+
+        tx_bit(data[9]);
+        tx_bit(data[8]);
+        tx_bit(data[7]);
+        tx_bit(data[6]);
+        tx_bit(data[5]);
+        tx_bit(data[4]);
+        tx_bit(data[3]);
+        tx_bit(data[2]);
+        tx_bit(data[1]);
+        tx_bit(data[0]);
+
+        tx_bit(parity);
+    end
+    endtask
+
+    task tx_end_sequence;
+    begin
+        tx_bit(0);
+
+        tx = 1;
+        #16;
+        tx = 0;
+    end
+    endtask
+
+    task tx_bit_custom (
+        input bit,
+        input [15:0] first_half_duration,
+        input [15:0] second_half_duration
+    );
+    begin
+        tx = !bit;
+        #first_half_duration;
+        tx = bit;
+        #second_half_duration;
+        tx = 0;
+    end
+    endtask
+
+    task tx_set (
+        input value
+    );
+    begin
+        tx = value;
+    end
+    endtask
+endmodule

interface2/fpga/tests/run_test.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+VVP=vvp
+
+echo "Running $1"
+
+${VVP} -N $1

interface2/pcb/.gitignore

@@ -0,0 +1,26 @@
+# For PCBs designed using KiCad: http://www.kicad-pcb.org/
+# Format documentation: http://kicad-pcb.org/help/file-formats/
+
+# Temporary files
+*.000
+*.bak
+*.bck
+*.kicad_pcb-bak
+*.sch-bak
+*~
+_autosave-*
+*.tmp
+*-save.pro
+*-save.kicad_pcb
+fp-info-cache
+
+# Netlist files (exported from Eeschema)
+*.net
+
+# Autorouter files (exported from Pcbnew)
+*.dsn
+*.ses
+
+# Exported BOM files
+*.xml
+*.csv

interface2/pcb/fabrication/pcb-B_Mask.gbr

@@ -0,0 +1,68 @@
+G04 #@! TF.GenerationSoftware,KiCad,Pcbnew,5.1.9*
+G04 #@! TF.CreationDate,2021-01-05T21:26:03-06:00*
+G04 #@! TF.ProjectId,pcb,7063622e-6b69-4636-9164-5f7063625858,rev?*
+G04 #@! TF.SameCoordinates,Original*
+G04 #@! TF.FileFunction,Soldermask,Bot*
+G04 #@! TF.FilePolarity,Negative*
+%FSLAX46Y46*%
+G04 Gerber Fmt 4.6, Leading zero omitted, Abs format (unit mm)*
+G04 Created by KiCad (PCBNEW 5.1.9) date 2021-01-05 21:26:03*
+%MOMM*%
+%LPD*%
+G01*
+G04 APERTURE LIST*
+%ADD10C,4.500000*%
+%ADD11C,1.000000*%
+%ADD12O,1.350000X1.700000*%
+%ADD13O,1.100000X1.500000*%
+%ADD14O,1.600000X2.500000*%
+%ADD15O,3.500000X7.000000*%
+G04 APERTURE END LIST*
+D10*
+X20250000Y-63750000D03*
+D11*
+X66985000Y-99215000D03*
+X69525000Y-99215000D03*
+X66985000Y-96675000D03*
+X66985000Y-94135000D03*
+X69525000Y-96675000D03*
+X69525000Y-94135000D03*
+X66985000Y-91595000D03*
+X66985000Y-89055000D03*
+X69525000Y-91595000D03*
+X69525000Y-89055000D03*
+X66985000Y-86515000D03*
+X66985000Y-83975000D03*
+X69525000Y-86515000D03*
+X69525000Y-83975000D03*
+X66985000Y-81435000D03*
+X66985000Y-78895000D03*
+X69525000Y-81435000D03*
+X69525000Y-78895000D03*
+X69525000Y-76355000D03*
+X66985000Y-76355000D03*
+X66985000Y-73815000D03*
+X69525000Y-73815000D03*
+X66985000Y-71275000D03*
+X69525000Y-71275000D03*
+D10*
+X20250000Y-106750000D03*
+X68250000Y-106750000D03*
+X68250000Y-63750000D03*
+D11*
+X42000000Y-73500000D03*
+X45500000Y-71250000D03*
+X64750000Y-67000000D03*
+D12*
+X57295000Y-62131000D03*
+X62755000Y-62131000D03*
+D13*
+X57605000Y-65131000D03*
+X62445000Y-65131000D03*
+D14*
+X28710000Y-73000000D03*
+X31250000Y-73000000D03*
+D15*
+X36330000Y-67920000D03*
+X26170000Y-67920000D03*
+M02*

interface2/pcb/fabrication/pcb-B_Paste.gbr

@@ -0,0 +1,15 @@
+G04 #@! TF.GenerationSoftware,KiCad,Pcbnew,5.1.9*
+G04 #@! TF.CreationDate,2021-01-05T21:26:03-06:00*
+G04 #@! TF.ProjectId,pcb,7063622e-6b69-4636-9164-5f7063625858,rev?*
+G04 #@! TF.SameCoordinates,Original*
+G04 #@! TF.FileFunction,Paste,Bot*
+G04 #@! TF.FilePolarity,Positive*
+%FSLAX46Y46*%
+G04 Gerber Fmt 4.6, Leading zero omitted, Abs format (unit mm)*
+G04 Created by KiCad (PCBNEW 5.1.9) date 2021-01-05 21:26:03*
+%MOMM*%
+%LPD*%
+G01*
+G04 APERTURE LIST*
+G04 APERTURE END LIST*
+M02*

interface2/pcb/fabrication/pcb-B_SilkS.gbr

@@ -0,0 +1,628 @@
+G04 #@! TF.GenerationSoftware,KiCad,Pcbnew,5.1.9*
+G04 #@! TF.CreationDate,2021-01-05T21:26:03-06:00*
+G04 #@! TF.ProjectId,pcb,7063622e-6b69-4636-9164-5f7063625858,rev?*
+G04 #@! TF.SameCoordinates,Original*
+G04 #@! TF.FileFunction,Legend,Bot*
+G04 #@! TF.FilePolarity,Positive*
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interface2/pcb/fabrication/pcb-NPTH.drl

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+M48
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interface2/pcb/fabrication/pcb-PTH.drl

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interface2/pcb/fp-lib-table

@@ -0,0 +1,3 @@
+(fp_lib_table
+  (lib (name library)(type KiCad)(uri ${KIPRJMOD}/library.pretty)(options "")(descr ""))
+)

interface2/pcb/library.dcm

@@ -0,0 +1,9 @@
+EESchema-DOCLIB  Version 2.0
+#
+$CMP Murata_78602
+D Murata 78602 General Purpose Pulse Transformer
+K murata
+F https://www.murata-ps.com/datasheet?/data/magnetics/kmp_786j.pdf
+$ENDCMP
+#
+#End Doc Library

interface2/pcb/library.lib

@@ -0,0 +1,44 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Murata_78602
+#
+DEF Murata_78602 T 0 20 Y N 1 F N
+F0 "T" 0 550 50 H V C CNN
+F1 "Murata_78602" 0 -550 50 H V C CNN
+F2 "library:Murata_786J" 0 0 50 H I C CNN
+F3 "" 300 0 50 H I C CNN
+DRAW
+A -100 -390 30 900 -900 0 1 8 N -100 -360 -100 -420
+A -100 -330 30 900 -900 0 1 8 N -100 -300 -100 -360
+A -100 -270 30 900 -900 0 1 8 N -100 -240 -100 -300
+A -100 -210 30 900 -900 0 1 8 N -100 -180 -100 -240
+A -100 210 30 900 -900 0 1 8 N -100 240 -100 180
+A -100 270 30 900 -900 0 1 8 N -100 300 -100 240
+A -100 330 30 900 -900 0 1 8 N -100 360 -100 300
+A -100 390 30 900 -900 0 1 8 N -100 420 -100 360
+A 100 -90 30 -900 900 0 1 8 N 100 -120 100 -60
+A 100 -30 30 -900 900 0 1 8 N 100 -60 100 0
+A 100 30 30 -900 900 0 1 8 N 100 0 100 60
+A 100 90 30 -900 900 1 1 8 N 100 60 100 120
+C -100 -210 10 0 1 0 F
+C -100 390 10 0 1 0 F
+C 100 90 10 0 1 0 F
+P 2 0 1 0 -100 -420 -100 -500 N
+P 2 0 1 0 -100 -100 -100 -180 N
+P 2 0 1 0 -100 180 -100 100 N
+P 2 0 1 0 -100 500 -100 420 N
+P 2 0 1 0 -25 425 -25 -425 N
+P 2 0 1 0 25 425 25 -425 N
+P 2 0 1 0 100 -120 100 -200 N
+P 2 0 1 0 100 200 100 120 N
+X ~ 1 200 200 100 L 50 50 1 1 P
+X ~ 2 -200 500 100 R 50 50 1 1 P
+X ~ 3 -200 -100 100 R 50 50 1 1 P
+X ~ 4 -200 -500 100 R 50 50 1 1 P
+X ~ 5 -200 100 100 R 50 50 1 1 P
+X ~ 6 200 -200 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library

interface2/pcb/library.pretty/CDFN3225-4LD-PL-1.kicad_mod

@@ -0,0 +1,22 @@
+(module CDFN3225-4LD-PL-1 (layer F.Cu) (tedit 5F9F1322)
+  (fp_text reference REF** (at 0 3.05) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value CDFN3225-4LD-PL-1 (at 0 -2.85) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -1.8415 -1.778) (end -1.8415 1.3335) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 1.524 1.3335) (end 1.524 -1.778) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -1.905 0.254) (end -1.905 1.4605) (layer F.SilkS) (width 0.12))
+  (fp_line (start -1.905 1.4605) (end -0.6985 1.4605) (layer F.SilkS) (width 0.12))
+  (fp_line (start 1.524 -1.778) (end -1.8415 -1.778) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -1.8415 1.3335) (end 1.524 1.3335) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 1.438614 1.041754) (end -1.761386 1.041754) (layer F.Fab) (width 0.15))
+  (fp_line (start 1.438614 -1.458246) (end 1.438614 1.041754) (layer F.Fab) (width 0.15))
+  (fp_line (start -1.761386 -1.458246) (end 1.438614 -1.458246) (layer F.Fab) (width 0.15))
+  (fp_line (start -1.761386 1.041754) (end -1.761386 -1.458246) (layer F.Fab) (width 0.15))
+  (pad 1 smd rect (at -1.211386 0.741754 90) (size 1 0.9) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at -1.211386 -1.158246 90) (size 1 0.9) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at 0.888614 -1.158246 90) (size 1 0.9) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 0.888614 0.741754 90) (size 1 0.9) (layers F.Cu F.Paste F.Mask))
+)

interface2/pcb/library.pretty/Murata_786J.kicad_mod

@@ -0,0 +1,36 @@
+(module Murata_786J (layer F.Cu) (tedit 5E551C1E)
+  (attr smd)
+  (fp_text reference REF** (at 0 -4.5) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value Murata_786J (at 0 4.5) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -2.2 -3.555) (end -3.2 -2.555) (layer F.Fab) (width 0.1))
+  (fp_line (start -3.31 -3.665) (end -3.31 3.665) (layer F.SilkS) (width 0.12))
+  (fp_line (start -3.31 3.665) (end 3.31 3.665) (layer F.SilkS) (width 0.12))
+  (fp_line (start -3.31 -3.665) (end 3.31 -3.665) (layer F.SilkS) (width 0.12))
+  (fp_line (start 3.31 3.665) (end 3.31 -3.665) (layer F.SilkS) (width 0.12))
+  (fp_text user %R (at 0 0) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -5.01 3.81) (end -5.01 -3.81) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 5.01 3.81) (end -5.01 3.81) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 5.01 -3.81) (end 5.01 3.81) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -5.01 -3.81) (end 5.01 -3.81) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -3.2 3.555) (end -3.2 -2.555) (layer F.Fab) (width 0.1))
+  (fp_line (start 3.2 3.555) (end -3.2 3.555) (layer F.Fab) (width 0.1))
+  (fp_line (start 3.2 -3.555) (end 3.2 3.555) (layer F.Fab) (width 0.1))
+  (fp_line (start -2.2 -3.555) (end 3.2 -3.555) (layer F.Fab) (width 0.1))
+  (pad 4 smd rect (at 5.715 2.54) (size 1.524 1.016) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at -5.715 2.54) (size 1.524 1.016) (layers F.Cu F.Paste F.Mask))
+  (pad 6 smd rect (at 5.715 -2.54) (size 1.524 1.016) (layers F.Cu F.Paste F.Mask))
+  (pad 5 smd rect (at 5.715 0) (size 1.524 1.016) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at -5.715 0) (size 1.524 1.016) (layers F.Cu F.Paste F.Mask))
+  (pad 1 smd rect (at -5.715 -2.54) (size 1.524 1.016) (layers F.Cu F.Paste F.Mask))
+  (model ${KISYS3DMOD}/Transformer_SMD.3dshapes/Pulse_PA1323NL.wrl
+    (at (xyz 0 0 0))
+    (scale (xyz 1 1 1))
+    (rotate (xyz 0 0 0))
+  )
+)

interface2/pcb/library.pretty/TestPoint_Pad_2x12_D1.0mm.kicad_mod

@@ -0,0 +1,71 @@
+(module TestPoint_Pad_2x12_D1.0mm (layer F.Cu) (tedit 5F9F0FA0)
+  (descr "Through hole straight pin header, 2x12, 2.54mm pitch, double rows")
+  (tags "Through hole pin header THT 2x12 2.54mm double row")
+  (fp_text reference REF** (at 1.27 -2.33) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value TestPoint_Pad_2x12_D1.0mm (at 1.27 30.27) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start 4.35 -1.8) (end -1.8 -1.8) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 4.35 29.75) (end 4.35 -1.8) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -1.8 29.75) (end 4.35 29.75) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -1.8 -1.8) (end -1.8 29.75) (layer F.CrtYd) (width 0.05))
+  (fp_text user %R (at 1.27 13.97 90) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_circle (center 0 0) (end 0 0.7) (layer F.SilkS) (width 0.12))
+  (fp_circle (center 2.54 0) (end 3.54 0) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 0) (end 1 0) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 2.54) (end 1 2.54) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 2.54) (end 3.54 2.54) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 5.08) (end 3.54 5.08) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 5.08) (end 1 5.08) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 10.16) (end 1 10.16) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 10.16) (end 3.54 10.16) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 7.62) (end 1 7.62) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 7.62) (end 3.54 7.62) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 15.24) (end 1 15.24) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 15.24) (end 3.54 15.24) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 12.7) (end 1 12.7) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 12.7) (end 3.54 12.7) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 20.32) (end 1 20.32) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 20.32) (end 3.54 20.32) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 17.78) (end 1 17.78) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 17.78) (end 3.54 17.78) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 22.86) (end 3.54 22.86) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 25.4) (end 3.54 25.4) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 22.86) (end 1 22.86) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 25.4) (end 1 25.4) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 2.54 27.94) (end 3.54 27.94) (layer F.CrtYd) (width 0.05))
+  (fp_circle (center 0 27.94) (end 1 27.94) (layer F.CrtYd) (width 0.05))
+  (pad 1 smd circle (at 0 0) (size 1 1) (layers F.Cu F.Mask))
+  (pad 2 smd circle (at 2.54 0) (size 1 1) (layers F.Cu F.Mask))
+  (pad 3 smd circle (at 0 2.54) (size 1 1) (layers F.Cu F.Mask))
+  (pad 4 smd circle (at 2.54 2.54) (size 1 1) (layers F.Cu F.Mask))
+  (pad 6 smd circle (at 2.54 5.08) (size 1 1) (layers F.Cu F.Mask))
+  (pad 5 smd circle (at 0 5.08) (size 1 1) (layers F.Cu F.Mask))
+  (pad 7 smd circle (at 0 7.62) (size 1 1) (layers F.Cu F.Mask))
+  (pad 9 smd circle (at 0 10.16) (size 1 1) (layers F.Cu F.Mask))
+  (pad 8 smd circle (at 2.54 7.62) (size 1 1) (layers F.Cu F.Mask))
+  (pad 10 smd circle (at 2.54 10.16) (size 1 1) (layers F.Cu F.Mask))
+  (pad 11 smd circle (at 0 12.7) (size 1 1) (layers F.Cu F.Mask))
+  (pad 13 smd circle (at 0 15.24) (size 1 1) (layers F.Cu F.Mask))
+  (pad 12 smd circle (at 2.54 12.7) (size 1 1) (layers F.Cu F.Mask))
+  (pad 14 smd circle (at 2.54 15.24) (size 1 1) (layers F.Cu F.Mask))
+  (pad 15 smd circle (at 0 17.78) (size 1 1) (layers F.Cu F.Mask))
+  (pad 17 smd circle (at 0 20.32) (size 1 1) (layers F.Cu F.Mask))
+  (pad 16 smd circle (at 2.54 17.78) (size 1 1) (layers F.Cu F.Mask))
+  (pad 18 smd circle (at 2.54 20.32) (size 1 1) (layers F.Cu F.Mask))
+  (pad 19 smd circle (at 0 22.86) (size 1 1) (layers F.Cu F.Mask))
+  (pad 21 smd circle (at 0 25.4) (size 1 1) (layers F.Cu F.Mask))
+  (pad 20 smd circle (at 2.54 22.86) (size 1 1) (layers F.Cu F.Mask))
+  (pad 22 smd circle (at 2.54 25.4) (size 1 1) (layers F.Cu F.Mask))
+  (pad 23 smd circle (at 0 27.94) (size 1 1) (layers F.Cu F.Mask))
+  (pad 24 smd circle (at 2.54 27.94) (size 1 1) (layers F.Cu F.Mask))
+  (model ${KISYS3DMOD}/Connector_PinHeader_2.54mm.3dshapes/PinHeader_2x12_P2.54mm_Vertical.wrl
+    (at (xyz 0 0 0))
+    (scale (xyz 1 1 1))
+    (rotate (xyz 0 0 0))
+  )
+)

interface2/pcb/pcb-cache.lib

@@ -0,0 +1,690 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_Conn_Coaxial
+#
+DEF Connector_Conn_Coaxial J 0 40 Y N 1 F N
+F0 "J" 10 120 50 H V C CNN
+F1 "Connector_Conn_Coaxial" 115 0 50 V V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ *BNC*
+ *SMA*
+ *SMB*
+ *SMC*
+ *Cinch*
+$ENDFPLIST
+DRAW
+A -2 0 71 1636 0 0 1 10 N -70 20 70 0
+A -1 0 71 0 -1638 0 1 10 N 70 0 -70 -20
+C 0 0 20 0 1 8 N
+P 2 0 1 0 -100 0 -20 0 N
+P 2 0 1 0 0 -100 0 -70 N
+X In 1 -200 0 100 R 50 50 1 1 P
+X Ext 2 0 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_Generic_Conn_02x12_Odd_Even
+#
+DEF Connector_Generic_Conn_02x12_Odd_Even J 0 40 Y N 1 F N
+F0 "J" 50 600 50 H V C CNN
+F1 "Connector_Generic_Conn_02x12_Odd_Even" 50 -700 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_2x??_*
+$ENDFPLIST
+DRAW
+S -50 -595 0 -605 1 1 6 N
+S -50 -495 0 -505 1 1 6 N
+S -50 -395 0 -405 1 1 6 N
+S -50 -295 0 -305 1 1 6 N
+S -50 -195 0 -205 1 1 6 N
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 105 0 95 1 1 6 N
+S -50 205 0 195 1 1 6 N
+S -50 305 0 295 1 1 6 N
+S -50 405 0 395 1 1 6 N
+S -50 505 0 495 1 1 6 N
+S -50 550 150 -650 1 1 10 f
+S 150 -595 100 -605 1 1 6 N
+S 150 -495 100 -505 1 1 6 N
+S 150 -395 100 -405 1 1 6 N
+S 150 -295 100 -305 1 1 6 N
+S 150 -195 100 -205 1 1 6 N
+S 150 -95 100 -105 1 1 6 N
+S 150 5 100 -5 1 1 6 N
+S 150 105 100 95 1 1 6 N
+S 150 205 100 195 1 1 6 N
+S 150 305 100 295 1 1 6 N
+S 150 405 100 395 1 1 6 N
+S 150 505 100 495 1 1 6 N
+X Pin_1 1 -200 500 150 R 50 50 1 1 P
+X Pin_10 10 300 100 150 L 50 50 1 1 P
+X Pin_11 11 -200 0 150 R 50 50 1 1 P
+X Pin_12 12 300 0 150 L 50 50 1 1 P
+X Pin_13 13 -200 -100 150 R 50 50 1 1 P
+X Pin_14 14 300 -100 150 L 50 50 1 1 P
+X Pin_15 15 -200 -200 150 R 50 50 1 1 P
+X Pin_16 16 300 -200 150 L 50 50 1 1 P
+X Pin_17 17 -200 -300 150 R 50 50 1 1 P
+X Pin_18 18 300 -300 150 L 50 50 1 1 P
+X Pin_19 19 -200 -400 150 R 50 50 1 1 P
+X Pin_2 2 300 500 150 L 50 50 1 1 P
+X Pin_20 20 300 -400 150 L 50 50 1 1 P
+X Pin_21 21 -200 -500 150 R 50 50 1 1 P
+X Pin_22 22 300 -500 150 L 50 50 1 1 P
+X Pin_23 23 -200 -600 150 R 50 50 1 1 P
+X Pin_24 24 300 -600 150 L 50 50 1 1 P
+X Pin_3 3 -200 400 150 R 50 50 1 1 P
+X Pin_4 4 300 400 150 L 50 50 1 1 P
+X Pin_5 5 -200 300 150 R 50 50 1 1 P
+X Pin_6 6 300 300 150 L 50 50 1 1 P
+X Pin_7 7 -200 200 150 R 50 50 1 1 P
+X Pin_8 8 300 200 150 L 50 50 1 1 P
+X Pin_9 9 -200 100 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_TestPoint
+#
+DEF Connector_TestPoint TP 0 30 N N 1 F N
+F0 "TP" 0 270 50 H V C CNN
+F1 "Connector_TestPoint" 0 200 50 H V C CNN
+F2 "" 200 0 50 H I C CNN
+F3 "" 200 0 50 H I C CNN
+$FPLIST
+ Pin*
+ Test*
+$ENDFPLIST
+DRAW
+C 0 130 30 0 1 0 N
+X 1 1 0 0 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_USB_B_Micro
+#
+DEF Connector_USB_B_Micro J 0 40 Y Y 1 F N
+F0 "J" -200 450 50 H V L CNN
+F1 "Connector_USB_B_Micro" -200 350 50 H V L CNN
+F2 "" 150 -50 50 H I C CNN
+F3 "" 150 -50 50 H I C CNN
+ALIAS USB_B_Mini
+$FPLIST
+ USB*
+$ENDFPLIST
+DRAW
+C -150 85 25 0 1 10 F
+C -25 135 15 0 1 10 F
+S -200 -300 200 300 0 1 10 f
+S -5 -300 5 -270 0 1 0 N
+S 10 50 -20 20 0 1 10 F
+S 200 -205 170 -195 0 1 0 N
+S 200 -105 170 -95 0 1 0 N
+S 200 -5 170 5 0 1 0 N
+S 200 195 170 205 0 1 0 N
+P 2 0 1 10 -75 85 25 85 N
+P 4 0 1 10 -125 85 -100 85 -50 135 -25 135 N
+P 4 0 1 10 -100 85 -75 85 -50 35 0 35 N
+P 4 0 1 10 25 110 25 60 75 85 25 110 F
+P 5 0 1 0 -170 220 -70 220 -80 190 -160 190 -170 220 F
+P 9 0 1 0 -185 230 -185 220 -175 190 -175 180 -65 180 -65 190 -55 220 -55 230 -185 230 N
+X VBUS 1 300 200 100 L 50 50 1 1 w
+X D- 2 300 -100 100 L 50 50 1 1 B
+X D+ 3 300 0 100 L 50 50 1 1 B
+X ID 4 300 -200 100 L 50 50 1 1 P
+X GND 5 0 -400 100 U 50 50 1 1 w
+X Shield 6 -100 -400 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C_Small
+#
+DEF Device_C_Small C 0 10 N N 1 F N
+F0 "C" 10 70 50 H V L CNN
+F1 "Device_C_Small" 10 -80 50 H V L CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 13 -60 -20 60 -20 N
+P 2 0 1 12 -60 20 60 20 N
+X ~ 1 0 100 80 D 50 50 1 1 P
+X ~ 2 0 -100 80 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Ferrite_Bead
+#
+DEF Device_Ferrite_Bead FB 0 0 N Y 1 F N
+F0 "FB" -150 25 50 V V C CNN
+F1 "Device_Ferrite_Bead" 150 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Inductor_*
+ L_*
+ *Ferrite*
+$ENDFPLIST
+DRAW
+P 2 0 1 0 0 -50 0 -48 N
+P 2 0 1 0 0 50 0 51 N
+P 5 0 1 0 -109 16 -67 89 109 -12 66 -85 -109 16 N
+X ~ 1 0 150 100 D 50 50 1 1 P
+X ~ 2 0 -150 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Fuse
+#
+DEF Device_Fuse F 0 0 N Y 1 F N
+F0 "F" 80 0 50 V V C CNN
+F1 "Device_Fuse" -75 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ *Fuse*
+$ENDFPLIST
+DRAW
+S -30 -100 30 100 0 1 10 N
+P 2 0 1 0 0 100 0 -100 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_LED
+#
+DEF Device_LED D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_LED" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ LED*
+ LED_SMD:*
+ LED_THT:*
+$ENDFPLIST
+DRAW
+P 2 0 1 10 -50 -50 -50 50 N
+P 2 0 1 0 -50 0 50 0 N
+P 4 0 1 10 50 -50 50 50 -50 0 50 -50 N
+P 5 0 1 0 -120 -30 -180 -90 -150 -90 -180 -90 -180 -60 N
+P 5 0 1 0 -70 -30 -130 -90 -100 -90 -130 -90 -130 -60 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# FPGA_Lattice_ICE40UP5K-SG48ITR
+#
+DEF FPGA_Lattice_ICE40UP5K-SG48ITR U 0 20 Y Y 4 L N
+F0 "U" -350 -1150 50 H V C CNN
+F1 "FPGA_Lattice_ICE40UP5K-SG48ITR" 0 -1250 50 H V C CNN
+F2 "Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm" 0 -1350 50 H I C CNN
+F3 "" -400 1000 50 H I C CNN
+ALIAS ICE5LP1K-SG48
+$FPLIST
+ QFN*7x7mm*P0.5mm*EP5.6x5.6mm*
+$ENDFPLIST
+DRAW
+S -300 1000 300 -1100 1 1 10 f
+S -400 1000 400 -1000 2 1 10 f
+S -300 600 300 -600 3 1 10 f
+S -200 300 200 -300 4 1 10 f
+X IOT_37a 23 -400 500 100 R 50 50 1 1 B
+X IOT_36b 25 -400 600 100 R 50 50 1 1 B
+X IOT_39a 26 -400 300 100 R 50 50 1 1 B
+X IOT_38b 27 -400 400 100 R 50 50 1 1 B
+X IOT_41a 28 -400 200 100 R 50 50 1 1 B
+X IOT_42b 31 -400 100 100 R 50 50 1 1 B
+X IOT_43a 32 -400 0 100 R 50 50 1 1 B
+X VCCIO_0 33 0 1100 100 D 50 50 1 1 W
+X IOT_44b 34 -400 -100 100 R 50 50 1 1 B
+X IOT_46b_G0 35 -400 -300 100 R 50 50 1 1 B
+X IOT_48b 36 -400 -400 100 R 50 50 1 1 B
+X IOT_45a_G1 37 -400 -200 100 R 50 50 1 1 B
+X IOT_50b 38 -400 -600 100 R 50 50 1 1 B
+X RGB0 39 -400 -800 100 R 50 50 1 1 C
+X RGB1 40 -400 -900 100 R 50 50 1 1 C
+X RGB2 41 -400 -1000 100 R 50 50 1 1 C
+X IOT_51a 42 -400 -700 100 R 50 50 1 1 B
+X IOT_49a 43 -400 -500 100 R 50 50 1 1 B
+X IOB_18a 10 -500 200 100 R 50 50 2 1 B
+X IOB_20a 11 -500 100 100 R 50 50 2 1 B
+X IOB_22b 12 -500 0 100 R 50 50 2 1 B
+X IOB_24a 13 -500 -200 100 R 50 50 2 1 B
+X IOB_32a_SPI_SO 14 -500 -600 100 R 50 50 2 1 B
+X IOB_34a_SPI_SCK 15 -500 -800 100 R 50 50 2 1 B
+X IOB_35b_SPI_SS 16 -500 -900 100 R 50 50 2 1 B
+X IOB_33b_SPI_SI 17 -500 -700 100 R 50 50 2 1 B
+X IOB_31b 18 -500 -500 100 R 50 50 2 1 B
+X IOB_29b 19 -500 -400 100 R 50 50 2 1 B
+X IOB_25b_G3 20 -500 -300 100 R 50 50 2 1 B
+X IOB_23b 21 -500 -100 100 R 50 50 2 1 B
+X SPI_VCCIO1 22 0 1100 100 D 50 50 2 1 W
+X IOB_13b 6 -500 400 100 R 50 50 2 1 B
+X CDONE 7 500 700 100 L 50 50 2 1 C
+X ~CRESET 8 -500 700 100 R 50 50 2 1 I
+X IOB_16a 9 -500 300 100 R 50 50 2 1 B
+X VCCIO_2 1 0 700 100 D 50 50 3 1 W
+X IOB_6a 2 -400 -300 100 R 50 50 3 1 B
+X IOB_9b 3 -400 -500 100 R 50 50 3 1 B
+X IOB_8a 4 -400 -400 100 R 50 50 3 1 B
+X IOB_3b_G6 44 -400 0 100 R 50 50 3 1 B
+X IOB_5b 45 -400 -200 100 R 50 50 3 1 B
+X IOB_0a 46 -400 200 100 R 50 50 3 1 B
+X IOB_2a 47 -400 100 100 R 50 50 3 1 B
+X IOB_4a 48 -400 -100 100 R 50 50 3 1 B
+X VPP_2V5 24 -100 400 100 D 50 50 4 1 W
+X VCCPLL 29 100 400 100 D 50 50 4 1 w
+X VCC 30 0 400 100 D 50 50 4 1 P N
+X GND 49 0 -400 100 U 50 50 4 1 W
+X VCC 5 0 400 100 D 50 50 4 1 W
+ENDDRAW
+ENDDEF
+#
+# Interface_LineDriver_MC3486N
+#
+DEF Interface_LineDriver_MC3486N U 0 40 Y N 4 F N
+F0 "U" -300 300 50 H V C CNN
+F1 "Interface_LineDriver_MC3486N" 200 200 50 H V C CNN
+F2 "Package_DIP:DIP-14_W7.62mm" 0 -400 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ DIP*W7.62mm*
+$ENDFPLIST
+DRAW
+P 2 0 1 0 -250 -200 250 0 N
+P 2 0 1 0 -250 200 -250 -200 N
+P 2 0 1 0 0 -200 0 -100 N
+P 2 0 1 0 250 0 -250 200 N
+X E- 1 -500 100 250 R 50 50 1 1 I I
+X VCC 16 -100 300 150 D 50 50 1 1 W
+X E+ 2 -500 -100 250 R 50 50 1 1 I
+X OUT 3 500 0 250 L 50 50 1 1 T
+X ENABLE 4 0 -300 100 U 50 50 1 1 I
+X GND 8 -100 -300 150 U 50 50 1 1 W
+X VCC 16 -100 300 150 D 50 50 2 1 W
+X ENABLE 4 0 -300 100 U 50 50 2 1 I
+X OUT 5 500 0 250 L 50 50 2 1 T
+X E+ 6 -500 -100 250 R 50 50 2 1 I
+X E- 7 -500 100 250 R 50 50 2 1 I I
+X GND 8 -100 -300 150 U 50 50 2 1 W
+X E+ 10 -500 -100 250 R 50 50 3 1 I
+X OUT 11 500 0 250 L 50 50 3 1 T
+X ENABLE 12 0 -300 100 U 50 50 3 1 I
+X VCC 16 -100 300 150 D 50 50 3 1 W
+X GND 8 -100 -300 150 U 50 50 3 1 W
+X E- 9 -500 100 250 R 50 50 3 1 I I
+X ENABLE 12 0 -300 100 U 50 50 4 1 I
+X OUT 13 500 0 250 L 50 50 4 1 T
+X E+ 14 -500 -100 250 R 50 50 4 1 I
+X E- 15 -500 100 250 R 50 50 4 1 I I
+X VCC 16 -100 300 150 D 50 50 4 1 W
+X GND 8 -100 -300 150 U 50 50 4 1 W
+ENDDRAW
+ENDDEF
+#
+# Interface_LineDriver_MC3487N
+#
+DEF Interface_LineDriver_MC3487N U 0 40 Y N 4 F N
+F0 "U" -250 300 50 H V C CNN
+F1 "Interface_LineDriver_MC3487N" 200 250 50 H V C CNN
+F2 "Package_DIP:DIP-16_W7.62mm" 0 -400 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ DIP*W7.62mm*
+$ENDFPLIST
+DRAW
+C 109 100 40 0 1 0 N
+P 2 0 1 0 -250 -200 250 0 N
+P 2 0 1 0 -250 200 -250 -200 N
+P 2 0 1 0 0 -200 0 -100 N
+P 2 0 1 0 150 100 250 100 N
+P 2 0 1 0 180 -100 129 -50 N
+P 2 0 1 0 250 -100 180 -100 N
+P 2 0 1 0 250 0 -250 200 N
+X INPUT 1 -500 0 250 R 50 50 1 1 I
+X VCC 16 -100 300 150 D 50 50 1 1 W
+X OUT+ 2 500 -100 300 L 50 50 1 1 T
+X OUT- 3 500 100 300 L 50 50 1 1 T
+X ENABLE 4 0 -300 100 U 50 50 1 1 I
+X GND 8 -100 -300 150 U 50 50 1 1 W
+X VCC 16 -100 300 150 D 50 50 2 1 W
+X ENABLE 4 0 -300 100 U 50 50 2 1 I
+X OUT- 5 500 100 300 L 50 50 2 1 T
+X OUT+ 6 500 -100 300 L 50 50 2 1 T
+X INPUT 7 -500 0 250 R 50 50 2 1 I
+X GND 8 -100 -300 150 U 50 50 2 1 W
+X OUT+ 10 500 -100 300 L 50 50 3 1 T
+X OUT- 11 500 100 300 L 50 50 3 1 T
+X ENABLE 12 0 -300 100 U 50 50 3 1 I
+X VCC 16 -100 300 150 D 50 50 3 1 W
+X GND 8 -100 -300 150 U 50 50 3 1 W
+X INPUT 9 -500 0 250 R 50 50 3 1 I
+X ENABLE 12 0 -300 100 U 50 50 4 1 I
+X OUT- 13 500 100 300 L 50 50 4 1 T
+X OUT+ 14 500 -100 300 L 50 50 4 1 T
+X INPUT 15 -500 0 250 R 50 50 4 1 I
+X VCC 16 -100 300 150 D 50 50 4 1 W
+X GND 8 -100 -300 150 U 50 50 4 1 W
+ENDDRAW
+ENDDEF
+#
+# MCU_ST_STM32L4_STM32L443CCUx
+#
+DEF MCU_ST_STM32L4_STM32L443CCUx U 0 20 Y Y 1 F N
+F0 "U" -500 1350 50 H V L CNN
+F1 "MCU_ST_STM32L4_STM32L443CCUx" 300 1350 50 H V L CNN
+F2 "Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm" -500 -1400 50 H I R CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ QFN*1EP*7x7mm*P0.5mm*
+$ENDFPLIST
+DRAW
+S -500 -1400 500 1300 0 1 10 f
+X VBAT 1 -200 1400 100 D 50 50 1 1 W
+X PA0 10 600 200 100 L 50 50 1 1 B
+X PA1 11 600 100 100 L 50 50 1 1 B
+X PA2 12 600 0 100 L 50 50 1 1 B
+X PA3 13 600 -100 100 L 50 50 1 1 B
+X PA4 14 600 -200 100 L 50 50 1 1 B
+X PA5 15 600 -300 100 L 50 50 1 1 B
+X PA6 16 600 -400 100 L 50 50 1 1 B
+X PA7 17 600 -500 100 L 50 50 1 1 B
+X PB0 18 -600 200 100 R 50 50 1 1 B
+X PB1 19 -600 100 100 R 50 50 1 1 B
+X PC13 2 -600 600 100 R 50 50 1 1 B
+X PB2 20 -600 0 100 R 50 50 1 1 B
+X PB10 21 -600 -800 100 R 50 50 1 1 B
+X PB11 22 -600 -900 100 R 50 50 1 1 B
+X VSS 23 -200 -1500 100 U 50 50 1 1 W
+X VDD 24 -100 1400 100 D 50 50 1 1 W
+X PB12 25 -600 -1000 100 R 50 50 1 1 B
+X PB13 26 -600 -1100 100 R 50 50 1 1 B
+X PB14 27 -600 -1200 100 R 50 50 1 1 B
+X PB15 28 -600 -1300 100 R 50 50 1 1 B
+X PA8 29 600 -600 100 L 50 50 1 1 B
+X PC14 3 -600 500 100 R 50 50 1 1 B
+X PA9 30 600 -700 100 L 50 50 1 1 B
+X PA10 31 600 -800 100 L 50 50 1 1 B
+X PA11 32 600 -900 100 L 50 50 1 1 B
+X PA12 33 600 -1000 100 L 50 50 1 1 B
+X PA13 34 600 -1100 100 L 50 50 1 1 B
+X VSS 35 -100 -1500 100 U 50 50 1 1 W
+X VDDUSB 36 200 1400 100 D 50 50 1 1 W
+X PA14 37 600 -1200 100 L 50 50 1 1 B
+X PA15 38 600 -1300 100 L 50 50 1 1 B
+X PB3 39 -600 -100 100 R 50 50 1 1 B
+X PC15 4 -600 400 100 R 50 50 1 1 B
+X PB4 40 -600 -200 100 R 50 50 1 1 B
+X PB5 41 -600 -300 100 R 50 50 1 1 B
+X PB6 42 -600 -400 100 R 50 50 1 1 B
+X PB7 43 -600 -500 100 R 50 50 1 1 B
+X PH3 44 -600 800 100 R 50 50 1 1 B
+X PB8 45 -600 -600 100 R 50 50 1 1 B
+X PB9 46 -600 -700 100 R 50 50 1 1 B
+X VSS 47 0 -1500 100 U 50 50 1 1 W
+X VDD 48 0 1400 100 D 50 50 1 1 W
+X VSS 49 100 -1500 100 U 50 50 1 1 W
+X PH0 5 -600 1000 100 R 50 50 1 1 I
+X PH1 6 -600 900 100 R 50 50 1 1 I
+X NRST 7 -600 1200 100 R 50 50 1 1 I
+X VSSA 8 200 -1500 100 U 50 50 1 1 W
+X VDDA 9 100 1400 100 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Mechanical_MountingHole_Pad
+#
+DEF Mechanical_MountingHole_Pad H 0 40 N N 1 F N
+F0 "H" 0 250 50 H V C CNN
+F1 "Mechanical_MountingHole_Pad" 0 175 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ MountingHole*Pad*
+$ENDFPLIST
+DRAW
+C 0 50 50 0 1 50 N
+X 1 1 0 -100 100 U 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
+# Oscillator_SG-8002LB
+#
+DEF Oscillator_SG-8002LB X 0 10 Y Y 1 F N
+F0 "X" -200 250 50 H V L CNN
+F1 "Oscillator_SG-8002LB" 50 -250 50 H V L CNN
+F2 "Oscillator:Oscillator_SMD_SeikoEpson_SG8002LB-4Pin_5.0x3.2mm" 700 -350 50 H I C CNN
+F3 "" -100 0 50 H I C CNN
+ALIAS SG-5032CCN
+$FPLIST
+ Oscillator*SMD*SeikoEpson*SG8002LB*5.0x3.2mm*
+$ENDFPLIST
+DRAW
+S -200 200 200 -200 0 1 10 f
+P 10 0 1 0 -50 -30 -40 -30 -40 30 -20 30 -20 -30 0 -30 0 30 20 30 20 -30 30 -30 N
+X OE 1 -300 0 100 R 50 50 1 1 I
+X GND 2 0 -300 100 U 50 50 1 1 W
+X OUT 3 300 0 100 L 50 50 1 1 O
+X Vcc 4 0 300 100 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Power_Protection_USBLC6-2SC6
+#
+DEF Power_Protection_USBLC6-2SC6 U 0 20 Y N 1 F N
+F0 "U" 100 350 50 H V L CNN
+F1 "Power_Protection_USBLC6-2SC6" 100 -350 50 H V L CNN
+F2 "Package_TO_SOT_SMD:SOT-23-6" 0 -500 50 H I C CNN
+F3 "" 200 350 50 H I C CNN
+$FPLIST
+ SOT?23*
+$ENDFPLIST
+DRAW
+C -200 0 10 0 1 0 F
+C -100 0 10 0 1 0 F
+C 0 -250 10 0 1 0 F
+C 0 250 10 0 1 0 F
+C 100 0 10 0 1 0 F
+C 200 0 10 0 1 0 F
+S -300 -300 300 300 0 1 10 f
+S -100 250 100 -250 0 1 0 N
+P 2 0 1 0 -200 -100 -300 -100 N
+P 2 0 1 0 -200 0 -200 -100 N
+P 2 0 1 0 -200 100 -300 100 N
+P 2 0 1 0 -60 -110 -140 -110 N
+P 2 0 1 0 -60 190 -140 190 N
+P 2 0 1 0 0 -300 0 -250 N
+P 2 0 1 0 0 -250 0 50 N
+P 2 0 1 0 0 50 0 250 N
+P 2 0 1 0 0 250 0 300 N
+P 2 0 1 0 60 -110 140 -110 N
+P 2 0 1 0 60 190 140 190 N
+P 2 0 1 0 200 -100 300 -100 N
+P 2 0 1 0 200 0 200 -100 N
+P 2 0 1 0 200 100 300 100 N
+P 3 0 1 0 -100 0 -200 0 -200 100 N
+P 3 0 1 0 100 0 200 0 200 100 N
+P 4 0 1 0 -140 -190 -60 -190 -100 -110 -140 -190 N
+P 4 0 1 0 -140 110 -60 110 -100 190 -140 110 N
+P 4 0 1 0 -40 -40 40 -40 0 40 -40 -40 N
+P 4 0 1 0 40 40 30 40 -40 40 -40 20 N
+P 4 0 1 0 140 -190 60 -190 100 -110 140 -190 N
+P 4 0 1 0 140 110 60 110 100 190 140 110 N
+X I/O1 1 -400 -100 100 R 50 50 1 1 P
+X GND 2 0 -400 100 U 50 50 1 1 P
+X I/O2 3 400 -100 100 L 50 50 1 1 P
+X I/O2 4 400 100 100 L 50 50 1 1 P
+X VBUS 5 0 400 100 D 50 50 1 1 P
+X I/O1 6 -400 100 100 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Regulator_Linear_MIC5365-3.3YC5
+#
+DEF Regulator_Linear_MIC5365-3.3YC5 U 0 20 Y Y 1 F N
+F0 "U" -250 250 50 H V C CNN
+F1 "Regulator_Linear_MIC5365-3.3YC5" 0 250 50 H V L CNN
+F2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" 0 350 50 H I C CNN
+F3 "" -300 800 50 H I C CNN
+ALIAS MIC5366-3.3YC5
+$FPLIST
+ SOT*353*SC*70*
+$ENDFPLIST
+DRAW
+S -300 -200 300 200 0 1 10 f
+X VIN 1 -400 100 100 R 50 50 1 1 W
+X GND 2 0 -300 100 U 50 50 1 1 W
+X EN 3 -400 -100 100 R 50 50 1 1 I
+X NC 4 300 -100 100 L 50 50 1 1 N N
+X VOUT 5 400 100 100 L 50 50 1 1 w
+ENDDRAW
+ENDDEF
+#
+# Regulator_Linear_MIC5504-3.3YM5
+#
+DEF Regulator_Linear_MIC5504-3.3YM5 U 0 20 Y Y 1 F N
+F0 "U" -300 350 50 H V L CNN
+F1 "Regulator_Linear_MIC5504-3.3YM5" -300 250 50 H V L CNN
+F2 "Package_TO_SOT_SMD:SOT-23-5" 0 -400 50 H I C CNN
+F3 "" -250 250 50 H I C CNN
+ALIAS MIC5504-2.8YM5 MIC5504-2.5YM5 MIC5504-1.8YM5 MIC5504-1.2YM5 MIC5501-3.0YM5
+$FPLIST
+ SOT?23?5*
+$ENDFPLIST
+DRAW
+S -300 -200 300 200 0 1 10 f
+X VIN 1 -400 100 100 R 50 50 1 1 W
+X GND 2 0 -300 100 U 50 50 1 1 W
+X EN 3 -400 -100 100 R 50 50 1 1 I
+X NC 4 300 -100 100 L 50 50 1 1 N N
+X VOUT 5 400 100 100 L 50 50 1 1 w
+ENDDRAW
+ENDDEF
+#
+# library_Murata_78602
+#
+DEF library_Murata_78602 T 0 20 Y N 1 F N
+F0 "T" 0 550 50 H V C CNN
+F1 "library_Murata_78602" 0 -550 50 H V C CNN
+F2 "library:Murata_786J" 0 0 50 H I C CNN
+F3 "" 300 0 50 H I C CNN
+DRAW
+A -100 -390 30 900 -900 0 1 8 N -100 -360 -100 -420
+A -100 -330 30 900 -900 0 1 8 N -100 -300 -100 -360
+A -100 -270 30 900 -900 0 1 8 N -100 -240 -100 -300
+A -100 -210 30 900 -900 0 1 8 N -100 -180 -100 -240
+A -100 210 30 900 -900 0 1 8 N -100 240 -100 180
+A -100 270 30 900 -900 0 1 8 N -100 300 -100 240
+A -100 330 30 900 -900 0 1 8 N -100 360 -100 300
+A -100 390 30 900 -900 0 1 8 N -100 420 -100 360
+A 100 -90 30 -900 900 0 1 8 N 100 -120 100 -60
+A 100 -30 30 -900 900 0 1 8 N 100 -60 100 0
+A 100 30 30 -900 900 0 1 8 N 100 0 100 60
+A 100 90 30 -900 900 1 1 8 N 100 60 100 120
+C -100 -210 10 0 1 0 F
+C -100 390 10 0 1 0 F
+C 100 90 10 0 1 0 F
+P 2 0 1 0 -100 -420 -100 -500 N
+P 2 0 1 0 -100 -100 -100 -180 N
+P 2 0 1 0 -100 180 -100 100 N
+P 2 0 1 0 -100 500 -100 420 N
+P 2 0 1 0 -25 425 -25 -425 N
+P 2 0 1 0 25 425 25 -425 N
+P 2 0 1 0 100 -120 100 -200 N
+P 2 0 1 0 100 200 100 120 N
+X ~ 1 200 200 100 L 50 50 1 1 P
+X ~ 2 -200 500 100 R 50 50 1 1 P
+X ~ 3 -200 -100 100 R 50 50 1 1 P
+X ~ 4 -200 -500 100 R 50 50 1 1 P
+X ~ 5 -200 100 100 R 50 50 1 1 P
+X ~ 6 200 -200 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_+1V2
+#
+DEF power_+1V2 #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+1V2" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +1V2 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_+3V3
+#
+DEF power_+3V3 #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+3V3" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+ALIAS +3.3V
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +3V3 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_VBUS
+#
+DEF power_VBUS #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_VBUS" 0 150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X VBUS 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library