If you spend enough time writing interrupt service routines in low-level embedded code, one tiny instruction shows up again and again: RETI. On paper it looks simple. It means RETurn from Interrupt. In practice, though, that small instruction exposes deep architectural differences between microcontroller families. On some CPUs RETI is a real instruction with distinct […]
Going Low Level
Some time ago I have on boarded on a very ambitious project that I though could be overkill, nevertheless I have persevered in my ambition to prove it is doable. However, as I needed to dig a bit into Assembly language, I have gathered some resources I thought it might be useful to share here.