Coroutine demonstration with setjmp/longjmp (STM32)

The fine article seems a bit overcomplicated to me. How about this? https://dotat.at/@/2010-01-22-coroutines-in-less-than-20-lin...

Huh, it just hit me that when a binary is "portable" it's "port"-able to a different system. I don't think I ever connected those two meanings before.