Macro define_peripherals 

macro_rules! define_peripherals {
    (
        $(#[$outer:meta])*
        $peripherals:ident {
            $(
                $(#[$inner:meta])*
                $peripheral_name:ident : $peripheral_field:ident $(=$peripheral_alias:ident)?
            ),*
            $(,)?
        }
    ) => { ... };
}

This macro allows to obtain peripherals from the one listed in the peripherals module exported by this crate.

It makes sense to use this macro multiple times, coupled with conditional compilation (using the cfg attribute), to define different setups for different boards.

Examples

Basic usage for defining a peripheral struct holding two LED pins:

ariel_os::hal::define_peripherals!(LedPeripherals {
    led0: P0_13,
    led1: P0_14,
});

#[ariel_os::task(autostart, peripherals)]
async fn blinky(peripherals: LedPeripherals) {
    let led = Output::new(peripherals.led0, Level::Low);
    // ...
}

Using cfg attributes to define the same struct with a different pin on each board:

#[cfg(context = "nrf52840dk")]
ariel_os::hal::define_peripherals!(LedPeripherals { led: P0_13 });

#[cfg(context = "rpi-pico")]
ariel_os::hal::define_peripherals!(LedPeripherals { led: PIN_25 });

Defining a LedPin type alias, so the type of the LED’s peripheral can be named the same way on every board:

#[cfg(context = "nrf52840dk")]
ariel_os::hal::define_peripherals!(LedPeripherals { led: P0_13 = LedPin });

#[cfg(context = "rpi-pico")]
ariel_os::hal::define_peripherals!(LedPeripherals { led: PIN_25 = LedPin });