I find the Rust embedded-hal to be quite good. STM's HAL code is a horrible inefficient mess, though their LL library isn't bad. I'd much rather use Rust's hal

I find the Rust embedded-hal to be quite good. STM's HAL code is a horrible inefficient mess, though their LL library isn't bad. I'd much rather use Rust's hal crates and probe-run. That said, CubeMX's configuration tool is very nice. But that's used (hopefully) once at board bringup and never again, so not worth sticking with C for.