feat(rp): add output enable inversion API (gpio, pio)

[ericschaal]

Summary

Adds set_output_enable_inversion API to both GPIO and PIO pin types, providing control over output enable signal polarity.

Changes

• Added set_output_enable_inversion(&mut self, invert: bool) method to GPIO pins
• Added set_output_enable_inversion(&mut self, invert: bool) method to PIO pins

[i509VCB]

I think set_output_enable_inversion could be shorted to set_output_inversion and mean the same thing.

[ericschaal]

Hi @i509VCB,

I think these are different things. set_output_inversion flips the data (HIGH/LOW), while set_output_enable_inversion inverts the output enable signal. They use different registers (OUTOVER vs OEOVER).

For background, I needed this to implement i2C using PIO. I'm using this pico sample as a reference.

Let me know if I'm misunderstanding though!

[i509VCB]

Okay, so I guess ignore my comment then regarding naming.

[ericschaal]

@i509VCB Please let me know if anything is needed from my end.