The blue pill board has to be programmed once using an STM32 programmer. After that, you can use most standard Forth words and also use some that can manipulate the low-level microcontroller ...

If you don’t want to rely on the Arduino IDE, there are ways around that, too. Blue Pill header pic: Popolon [ CC BY-SA 4.0 ] Posted in Arduino Hacks , ARM Tagged arduino , blue pill , bluepill ...