GPIO interconnect

[bugadani]

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Pull Request Details 📖

Description

This PR introduces the concept of a peripheral signal. Peripheral signals can be obtained from GPIO pins/pin drivers, the DummyPin (which... yeah, may go away probably), and Levels. These signals can then be passed to peripherals in place of the previous pin parameters (pins being a subset of signals, this is bw compatible).

The PR deletes AnyPin and replaces its functionality with InputSignal and OutputSignal. This also allowed me to rename ErasedPin to AnyPin.

Closes #1662

Testing

Changed HIL tests to use interconnects instead of external jumpers.

[Dominaezzz]

I cannot thank you enough for taking care of this!! I've been wanting this feature for so long and never had the time to implement it.

I hope my notes in the linked issue were somewhat useful.

[bugadani]

Part of the test failures is, I believe, PCNT overwriting output pin configurations. It configures its source using init_input which immediately nukes the pin's output(!) function selection. How polite of it to do so, hopefully resolving won't require extensive shotgun surgery.

[bugadani]

NGL CI here is bizarre, rebasing on top of the S2 fix PR made C2 and C6 pass. Nonsense, but I'll take it.

[bjoernQ]

Thanks!

[jessebraham]

Thanks for this! Lots here but overall I think it looks quite good. I have some nitpicky comments that I will keep to myself but nothing else to add otherwise really, so LGTM.

[bugadani]

Please do tell your nitpicky comments, we can clear those up!

[MabezDev]

I really like how this turned out. I'm also glad ErasedPin is now AnyPin. I think we should do the same rename for ErasedTimer, but I'll file an issue for that.

LGTM!

[bjoernQ]

Seems I can finally close bjoernQ#1 since we have it now 🚀