Add filler types for unused pins in communication peripherals about stm32f0xx-hal HOT 4 OPEN

I've already started #27, which takes a bit different, but similar approach. I personally prefer the approach with an universal Unused pin implementing all the AF traits, but both approaches are (mostly) equivalent. It's doesn't seem hard to modify it.

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@david-sawatzke

I personally prefer the approach with an universal Unused pin implementing all the AF traits, but both approaches are (mostly) equivalent.

Uhm, that's not what your implementation does. I basically just defines an empty shell without any functionality (not even sure why you're using a PhantomData).

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With AF traits i meant the traits that implement the link from af to peripheral, eg TxPin.

I used PhantomData because I wasn't sure if we maybe need to extend it in the future and without it it's constructable by user code (afaik).

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I used PhantomData because I wasn't sure if we maybe need to extend it in the future

😲

and without it it's constructable by user code (afaik).

In that case you could use

pub struct Unused {
    _0: (),
}

However it doesn't really matter since it's really just an empty shell and there's exactly none functionality attached to it (and true to the meaning never should be...).

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