STM8 as I2C matrix keyboard controller

Firmware for STM8 to act as matrix keyboard controller with I2C interface

• Only simplest reporting over I2C implemented (current state of matrix keys)
• Key states are scaned periodicaly and some state change buffering can be implemented
• Uses Standard Peripheral Library for STM8S
• I2C slave interface imlemented with interrupts
• Uses SDCC
• PlatformIO project provided

I use it with 4x4 Matrix Keypad and STM8S103F3 Breakout Board

Inspiration

• Standard Peripheral Library Examples
• First steps for the Keyboard controller

License

Parts of code under MCD-ST Liberty SW License Agreement V2

Copyright (c) 2022, devegied

Copyright (c) 2014, STMicroelectronics