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
+```