A simple core I developed for use with STM32F103 devices.
Definetely still in alpha/beta, but in a well-working state IMO.
Includes:
- DFU bootloader with small mods for easier programming
- Interrupt driven USB CDC ACM with integrated quick reset into DFU mode
- Interrupt driven UART library
- printf support for UART/CDC, courtesy of mini_printf
- Simple Arduino-like millis() counter
Longer Readme potentially coming soon!