USB-OTG Keyboard on STM32F4-Discovery

Using libopencm3

• PA2: TX
• PA3: RX
• Baudrate: 115200

11 Bytes / Package

• 0: 'S'
• 1-8: USB HID Package Bytes
• 9: 'E'
• 10: CRC

def crc(data):
    crc = 0
    for i in data:
        crc ^= i
        for i in data:
            if crc & 1:
                crc ^= 0x91
            crc>>=1
    return crc

ST-Wat is a simple daemon that uses stlinky and the stlink interface to send data to the stm32f4-discovery.

See host/ for code. Use make USE_STTERM=1 to replace USART with stlinky.