chuoique / stm32-ps2-usb-converter

A simple USB <-> PS/2 converter with GPIO multimedia keys

STM32: PS/2 to USB Converter

This code facilitates a STM32 chip to convert between PS/2 and USB. It is meant to connect a keyboard, which only provides a PS/2 connector, to a computer via USB. This code powers on a daily basis:

• Cherry G80-3000LSMDE

Dependencies

• arm-none-eabi-gcc
• arm-none-eabi-gdb
• arm-none-eabi-binutils
• arm-none-eabi-newlib
• stlink
• openocd
• mpfr

Preparations

After cloning the repository you need to make the following preparations:

git submodule init
git submodule update
cd libopencm3
make
cd ..
make

Hardware and Setup

You will obviously need a STM32 chip. At least, it should have connectors on PINs A6 and A7, as well on 5V and GND. Take a freely connectable PS/2 socket and connect its 5V and GND with the STM. Also connect its DATA pin to A6 and its CLK pin to A7. Add two pull-up resistors (10k Ohm works well) between A6/A7 and 5V, respectively.

Connect your STM via a microUSB/USB cable to your computer to power it up. Use a ST-Link v2 Programmer (or similar) to flash the program using make flash onto the STM32. You should then be able to connect your keyboard to the PS/2 socket and have it enumerated as an USB device on your computer.