Open source ARM Cortex-M microcontroller library
Why do you think that https://github.com/jbaumann/pio_and_stm32cubeide is a good alternative to libopencm3
Open source ARM Cortex-M microcontroller library
Why do you think that https://github.com/jbaumann/pio_and_stm32cubeide is a good alternative to libopencm3