With the embedded-hal rc3 update I changed them to require `&mut self`, but
in retrospect I think `&self` is better, for extra flexibility.
This PR reverts the changes from the rc3 update to inherent methods.
- Move typelevel interrupts to a special-purpose mod: `embassy_xx::interrupt::typelevel`.
- Reexport the PAC interrupt enum in `embassy_xx::interrupt`.
This has a few advantages:
- The `embassy_xx::interrupt` module is now more "standard".
- It works with `cortex-m` functions for manipulating interrupts, for example.
- It works with RTIC.
- the interrupt enum allows holding value that can be "any interrupt at runtime", this can't be done with typelevel irqs.
- When "const-generics on enums" is stable, we can remove the typelevel interrupts without disruptive changes to `embassy_xx::interrupt`.
Adding these changes enables us to define a channel using a mutable reference to `GPIOTE_CH(n)`, similar to how we can do with other drivers.
So instead of using:
```rust
let freq_in = InputChannel::new(
p.GPIOTE_CH0,
Input::new(&mut p.P0_19, embassy_nrf::gpio::Pull::Up),
embassy_nrf::gpiote::InputChannelPolarity::HiToLo,
);
```
we can use:
```rust
let freq_in = InputChannel::new(
&mut p.GPIOTE_CH0,
Input::new(&mut p.P0_19, embassy_nrf::gpio::Pull::Up),
embassy_nrf::gpiote::InputChannelPolarity::HiToLo,
);
```
Old code used `cfg_if!` because rustc still parses code inside disabled cfg's, and Rust stable at that time couldn't parse the new GAT where-clause location. This is not the case anymore.
- Move Interrupt and InterruptExecutor from `embassy` to `embassy-cortex-m`.
- Move Unborrow from `embassy` to `embassy-hal-common` (nothing in `embassy` requires it anymore)
- Move PeripheralMutex from `embassy-hal-common` to `embassy-cortex-m`.
