Feature request - SPI

[Wratox]

Add support for the SPIx peripherals.

Might try to add this myself, but is there any reason to not go straight for embedded_hal v1.0.0?
If so do you think stm32-rs/stm32h7xx-hal#476 is a good place to start?

[astapleton]

@Wratox I have a SPI implementation already that implements Master + Slave + embedded-hal 1.0.0 that I will start putting up for review soon!

[Wratox]

@astapleton Alright, nice!

I did start on it and I did the pins for SPI for stm32h573, is that something you have a use for or have you already implemented that?

[astapleton]

@Wratox yes, that would be helpful. I don't have pins for anything other than the STM32H503 right now

[Wratox]

@astapleton It's available at spi.rs at my spi branch.
I also did the pins for stm32h523, there's a comment in the code about what datasheets I've mapped.