STM32

This code came to light during the need for a simple driver for WS2812 leds. Protocol The WS2812/WS2812B leds use 24 bits for the green, red and blue values. Bits on the data line are encoded by a high pulse followed by a low pulse.

You have to implement a special function (_write) to tell the C-library how to process the output from the printf function.

Similar form factor to the blue pill boards. However this board is much more powerful and of a much better build quality.

There are many boards featuring the STM32F103. The blue pill is probably the cheapest one of them.