Added IWDT implementation

[diondokter]

I had this still lying around.
Updated it a bit

[diondokter]

Lol, so the CI decided to have an error...

I think everything is correct now

[richardeoin]

I re-ran the CI :)

The IWDG peripheral is present on all the H7 sub-families. Can this HAL implementation be used with all the sub-families? In any case I would remove the cfg guards from the example.

[richardeoin]

Just tried building it, looks like the PAC is broken for the rm0468 sub-family but ok for the other three (rm0433, rm0399, rm0455)

[richardeoin]

I tested on a STM32H7A3 Nucleo board, and it works for me. Thanks @diondokter !

bors r+

[diondokter]

Oh sweet! You finished it 😁
Cool, thank you for the work too! This is one of the most complete HALs out there which is really nice for such a complex chip.

[bors]

Build succeeded:

• ci (1.59.0, stm32h735)
• ci (1.59.0, stm32h743)
• ci (1.59.0, stm32h743v)
• ci (1.59.0, stm32h747cm7)
• ci (1.59.0, stm32h753)
• ci (1.59.0, stm32h753v)
• ci (1.59.0, stm32h7b0)
• ci (1.59.0, stm32h7b3)
• ci (stable, stm32h735)
• ci (stable, stm32h743)
• ci (stable, stm32h743v)
• ci (stable, stm32h747cm7)
• ci (stable, stm32h753)
• ci (stable, stm32h753v)
• ci (stable, stm32h7b0)
• ci (stable, stm32h7b3)
• Rustfmt