RP2350 PIO: Cant select IRQ as STATUS source

[TilBlechschmidt]

Hey there!

I was toying with the RP2350 PIOs and looking into "abusing" the mov _, STATUS instruction to transfer data between PIOs. This requires setting the two execctrl registers STATUS_N and STATUS_SEL both of which are configurable using the Config struct.

The StatusN struct has a variant for representing an IRQ index. However, I could not find a way to switch the select register. The StatusSource struct is missing a variant to represent the IRQ source and in the code which translates it into register writes I could not spot anything which sets the pac::pio::vals::ExecctrlStatusSel::IRQ value.

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Is there another way to do this or is it indeed a missing feature? If so, I would be happy to create a PR for it 🙂

In my local version, I simply added a variant to the StatusSource struct and extended the match statement in ~L736. Based on my testing, this seems to work just fine.

P.S.: If desired, I could add a minimal example of sending data between PIOs using just IRQs to the repo as well. See the not-yet-cleaned-up main.rs.txt.

[CBJamo]

You're correct, this is a missing feature. A PR would be very welcome.