Very cool! Which one? I have been using mostly G4 and H7 on my personal and work projects, but the HAL (`stm32-hal2` is the crate name) works for most of the one s in a certain time band; i.e. not any that were obsolte when I started it, and spotty or no support on some of the newer ones like U series and H5. And weaker / non-vetted support on MCU variants I haven't used, or haven't used a MCU/feature combo on.

I think in the future if I do an embedded rust project on a new MCU where there isn't an existing HAL, or one that is more work to repair than start over, I would just implement the subset needed for a project's reqs. Easier to keep track of scope that way. Currently the challenge is "X periph on Y variant of Z STM-32 family doesn't work under A condition" or "Doesn't work after this PAC update changed the syntax".