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