Note on how to acquire Pin's number as an integer

[elfmimi]

This is not an issue, but a sharing of knowledge that I wanted to have when I started.

It is about rp2040_hal::gpio::Pin .

at v0.9.0 it is like,

rp-hal/rp2040-hal/src/gpio/mod.rs

Lines 161 to 165 in 8f3e8d0

	pub struct Pin<I: PinId, F: func::Function, P: PullType> {
	id: I,
	function: F,
	pull_type: P,
	}

at v0.8.0 and v0.7.0 respectively, it was like,

rp-hal/rp2040-hal/src/gpio/pin.rs

Lines 450 to 457 in f6a0d1b

	pub struct Pin<I, M>
	where
	I: PinId,
	M: PinMode + ValidPinMode<I>,
	{
	regs: Registers<I>,
	mode: PhantomData<M>,
	}

rp-hal/rp2040-hal/src/gpio/pin.rs

Lines 450 to 457 in 4c8e16a

	pub struct Pin<I, M>
	where
	I: PinId,
	M: PinMode + ValidPinMode<I>,
	{
	regs: Registers<I>,
	mode: PhantomData<M>,
	}

Suppose we had a trait like this.

pub trait PinIdNum {
    fn get_id_num(&self) -> u8;
}

for v0.9.0 you can implement it like this.

impl<I, F, P> PinIdNum for Pin<I, F, P> where I: PinId, F: Function, P: PullType {
    fn get_id_num(&self) -> u8 { self.id().num }
}

for v0.8.0 it can be like following two ways.

impl<I, M> PinIdNum for Pin<I, M> where I: PinId, M: PinMode + ValidPinMode<I> {
    fn get_id_num(&self) -> u8 { self.id().num }
}

impl<I, M> PinIdNum for Pin<I, M> where I: PinId, M: PinMode + ValidPinMode<I> {
    fn get_id_num(&self) -> u8 { I::DYN.num }
}

for v0.7.0 only the latter of above two is valid.

impl<I, M> PinIdNum for Pin<I, M> where I: PinId, M: PinMode + ValidPinMode<I> {
    fn get_id_num(&self) -> u8 { I::DYN.num }
}

[elfmimi]

version correspondence
rp-pico 0.6.0 => rp2040-hal 0.7.0
rp-pico 0.7.0 => rp2040-hal 0.8.0
rp-pico 0.8.0 => rp2040-hal 0.9.0