atsamd_hal/peripherals/eic/d11/

pin.rs

use atsamd_hal_macros::hal_cfg;

use crate::ehal::digital::{ErrorType, InputPin};
use crate::ehal_02::digital::v2::InputPin as InputPin_02;
use crate::eic::*;
use crate::gpio::{
    self, pin::*, AnyPin, FloatingInterrupt, PinMode, PullDownInterrupt, PullUpInterrupt,
};
use core::convert::Infallible;

/// The pad macro defines the given EIC pin and implements EicPin for the
/// given pins. The EicPin implementation will configure the pin for the
/// appropriate function and return the pin wrapped in the EIC type.
macro_rules! ei {
    (
        $PadType:ident [ $num:expr ] {
            $(
                $(#[$attr:meta])*
                $PinType:ident,
            )+
        }
    ) => {
        crate::paste::item! {
            $(
                $(#[$attr])*
                impl<M: PinMode> EicPin for Pin<gpio::$PinType, M> {
                    type Floating = ExtInt<Pin<gpio::$PinType, FloatingInterrupt>, Self::ChId>;
                    type PullUp = ExtInt<Pin<gpio::$PinType, PullUpInterrupt>, Self::ChId>;
                    type PullDown = ExtInt<Pin<gpio::$PinType, PullDownInterrupt>, Self::ChId>;

                    type ChId = [<Ch $num>];

                    fn into_floating_ei(self, chan: Channel<Self::ChId>) -> Self::Floating {
                        Self::Floating::new(self.into_floating_interrupt(), chan)
                    }

                    fn into_pull_up_ei(self, chan: Channel<Self::ChId>) -> Self::PullUp {
                    Self::PullUp::new(self.into_pull_up_interrupt(), chan)
                    }

                    fn into_pull_down_ei(self, chan: Channel<Self::ChId>) -> Self::PullDown {
                        Self::PullDown::new(self.into_pull_down_interrupt(), chan)
                    }
                }
            )+
        }
    };
}

impl<P, Id, F> ExtInt<P, Id, F>
where
    P: EicPin,
    Id: ChId,
{
    /// Enables the event output of the channel for the event system.
    ///
    /// Note that whilst this function is executed, the EIC peripheral is disabled
    /// in order to write to the evctrl register
    pub fn enable_event(&mut self) {
        self.chan.with_disable(|e| {
            e.evctrl()
                .modify(|_, w| unsafe { w.bits(1 << P::ChId::ID) });
        });
    }

    pub fn enable_interrupt(&mut self) {
        self.chan
            .eic
            .intenset()
            .write(|w| unsafe { w.bits(1 << P::ChId::ID) });
    }

    pub fn enable_interrupt_wake(&mut self) {
        self.chan
            .eic
            .wakeup()
            .modify(|r, w| unsafe { w.bits(r.bits() | (1 << P::ChId::ID)) })
    }

    pub fn disable_interrupt(&mut self) {
        self.chan
            .eic
            .intenclr()
            .write(|w| unsafe { w.bits(1 << P::ChId::ID) });
    }

    pub fn is_interrupt(&mut self) -> bool {
        self.chan.eic.intflag().read().bits() & (1 << P::ChId::ID) != 0
    }

    pub fn clear_interrupt(&mut self) {
        self.chan
            .eic
            .intflag()
            .write(|w| unsafe { w.bits(1 << P::ChId::ID) });
    }

    pub fn sense(&mut self, sense: Sense) {
        self.chan.with_disable(|e| {
            // Which of the two config blocks this eic config is in
            let offset = (P::ChId::ID >> 3) & 0b0001;
            let config = &e.config(offset);

            config.modify(|_, w| unsafe {
                // Which of the eight eic configs in this config block
                match P::ChId::ID & 0b111 {
                    0b000 => w.sense0().bits(sense as u8),
                    0b001 => w.sense1().bits(sense as u8),
                    0b010 => w.sense2().bits(sense as u8),
                    0b011 => w.sense3().bits(sense as u8),
                    0b100 => w.sense4().bits(sense as u8),
                    0b101 => w.sense5().bits(sense as u8),
                    0b110 => w.sense6().bits(sense as u8),
                    0b111 => w.sense7().bits(sense as u8),
                    _ => unreachable!(),
                }
            });
        });
    }

    pub fn filter(&mut self, filter: bool) {
        self.chan.with_disable(|e| {
            // Which of the two config blocks this eic config is in
            let offset = (P::ChId::ID >> 3) & 0b0001;
            let config = &e.config(offset);

            config.modify(|_, w| {
                // Which of the eight eic configs in this config block
                match P::ChId::ID & 0b111 {
                    0b000 => w.filten0().bit(filter),
                    0b001 => w.filten1().bit(filter),
                    0b010 => w.filten2().bit(filter),
                    0b011 => w.filten3().bit(filter),
                    0b100 => w.filten4().bit(filter),
                    0b101 => w.filten5().bit(filter),
                    0b110 => w.filten6().bit(filter),
                    0b111 => w.filten7().bit(filter),
                    _ => unreachable!(),
                }
            });
        });
    }
}

impl<P, C, Id, F> InputPin_02 for ExtInt<P, Id, F>
where
    P: EicPin + AnyPin<Mode = Interrupt<C>>,
    Id: ChId,
    C: InterruptConfig,
{
    type Error = Infallible;
    #[inline]
    fn is_high(&self) -> Result<bool, Self::Error> {
        self.pin.is_high()
    }
    #[inline]
    fn is_low(&self) -> Result<bool, Self::Error> {
        self.pin.is_low()
    }
}

impl<P, Id, F> InputPin for ExtInt<P, Id, F>
where
    Self: ErrorType,
    P: EicPin,
    Id: ChId,
{
    #[inline]
    fn is_high(&mut self) -> Result<bool, Self::Error> {
        Ok(self.pin._is_high())
    }

    #[inline]
    fn is_low(&mut self) -> Result<bool, Self::Error> {
        Ok(self.pin._is_low())
    }
}

impl<P, Id, F> ErrorType for ExtInt<P, Id, F>
where
    P: EicPin,
    Id: ChId,
{
    type Error = Infallible;
}

#[cfg(feature = "async")]
mod async_impls {
    use embedded_hal_async::digital::Wait;

    use super::super::async_api::WAKERS;
    use super::*;

    impl<P, Id> ExtInt<P, Id, EicFuture>
    where
        P: EicPin,
        Id: ChId,
        Self: InputPin<Error = Infallible>,
    {
        pub async fn wait(&mut self, sense: Sense) {
            use core::{future::poll_fn, task::Poll};
            self.disable_interrupt();

            match sense {
                Sense::High => {
                    if self.is_high().unwrap() {
                        return;
                    }
                }
                Sense::Low => {
                    if self.is_low().unwrap() {
                        return;
                    }
                }
                _ => (),
            }

            self.enable_interrupt_wake();
            self.sense(sense);
            poll_fn(|cx| {
                if self.is_interrupt() {
                    self.clear_interrupt();
                    self.disable_interrupt();
                    self.sense(Sense::None);
                    return Poll::Ready(());
                }

                WAKERS[P::ChId::ID].register(cx.waker());
                self.enable_interrupt();

                if self.is_interrupt() {
                    self.clear_interrupt();
                    self.disable_interrupt();
                    self.sense(Sense::None);
                    return Poll::Ready(());
                }

                Poll::Pending
            })
            .await;
        }
    }

    impl<P, Id> Wait for ExtInt<P, Id, EicFuture>
    where
        P: EicPin,
        Id: ChId,
        Self: InputPin<Error = Infallible>,
    {
        async fn wait_for_high(&mut self) -> Result<(), Self::Error> {
            self.wait(Sense::High).await;
            Ok(())
        }

        async fn wait_for_low(&mut self) -> Result<(), Self::Error> {
            self.wait(Sense::Low).await;
            Ok(())
        }

        async fn wait_for_rising_edge(&mut self) -> Result<(), Self::Error> {
            self.wait(Sense::Rise).await;
            Ok(())
        }

        async fn wait_for_falling_edge(&mut self) -> Result<(), Self::Error> {
            self.wait(Sense::Fall).await;
            Ok(())
        }

        async fn wait_for_any_edge(&mut self) -> Result<(), Self::Error> {
            self.wait(Sense::Both).await;
            Ok(())
        }
    }
}

// The SAMD11 and SAMD21 devices have different ExtInt designations. Just for
// clarity's sake, the `ei!()` invocations below have been split into SAMD11-
// and SAMD21-specific declarations.

// SAMD11
#[hal_cfg("eic-d11")]
mod impls {
    use super::*;

    ei!(ExtInt[1] {
        #[hal_cfg("pa15")]
        PA15,
    });

    ei!(ExtInt[2] {
        #[hal_cfg("pa02")]
        PA02,
    });

    ei!(ExtInt[3] {
        #[hal_cfg("pa31")]
        PA31,
    });

    ei!(ExtInt[4] {
        #[hal_cfg("pa04")]
        PA04,
        #[hal_cfg("pa24")]
        PA24,
    });

    ei!(ExtInt[5] {
        #[hal_cfg("pa05")]
        PA05,
        #[hal_cfg("pa25")]
        PA25,
    });

    ei!(ExtInt[6] {
        #[hal_cfg("pa08")]
        PA08,
    });

    ei!(ExtInt[7] {
        #[hal_cfg("pa09")]
        PA09,
    });
}

// SAMD21
#[hal_cfg("eic-d21")]
mod impls {
    use super::*;

    ei!(ExtInt[0] {
        #[hal_cfg("pa00")]
        PA00,
        #[hal_cfg("pa16")]
        PA16,
        #[hal_cfg("pb00")]
        PB00,
        #[hal_cfg("pb16")]
        PB16,
    });

    ei!(ExtInt[1] {
        #[hal_cfg("pa01")]
        PA01,
        #[hal_cfg("pa17")]
        PA17,
        #[hal_cfg("pb01")]
        PB01,
        #[hal_cfg("pb17")]
        PB17,
    });

    ei!(ExtInt[2] {
        #[hal_cfg("pa02")]
        PA02,
        #[hal_cfg("pa18")]
        PA18,
        #[hal_cfg("pb02")]
        PB02,
    });

    ei!(ExtInt[3] {
        #[hal_cfg("pa03")]
        PA03,
        #[hal_cfg("pa19")]
        PA19,
        #[hal_cfg("pb03")]
        PB03,
    });

    ei!(ExtInt[4] {
        #[hal_cfg("pa04")]
        PA04,
        #[hal_cfg("pa20")]
        PA20,
        #[hal_cfg("pb04")]
        PB04,
    });

    ei!(ExtInt[5] {
        #[hal_cfg("pa05")]
        PA05,
        #[hal_cfg("pa21")]
        PA21,
        #[hal_cfg("pb05")]
        PB05,
    });

    ei!(ExtInt[6] {
        #[hal_cfg("pa06")]
        PA06,
        #[hal_cfg("pa22")]
        PA22,
        #[hal_cfg("pb06")]
        PB06,
        #[hal_cfg("pb22")]
        PB22,
    });

    ei!(ExtInt[7] {
        #[hal_cfg("pa07")]
        PA07,
        #[hal_cfg("pa23")]
        PA23,
        #[hal_cfg("pb07")]
        PB07,
        #[hal_cfg("pb23")]
        PB23,
    });

    ei!(ExtInt[8] {
        #[hal_cfg("pa28")]
        PA28,
        #[hal_cfg("pb08")]
        PB08,
    });

    ei!(ExtInt[9] {
        #[hal_cfg("pa09")]
        PA09,
        #[hal_cfg("pb09")]
        PB09,
    });

    ei!(ExtInt[10] {
        #[hal_cfg("pa10")]
        PA10,
        #[hal_cfg("pa30")]
        PA30,
        #[hal_cfg("pb10")]
        PB10,
    });

    ei!(ExtInt[11] {
        #[hal_cfg("pa11")]
        PA11,
        #[hal_cfg("pa31")]
        PA31,
        #[hal_cfg("pb11")]
        PB11,
    });

    ei!(ExtInt[12] {
        #[hal_cfg("pa12")]
        PA12,
        #[hal_cfg("pa24")]
        PA24,
        #[hal_cfg("pb12")]
        PB12,
    });

    ei!(ExtInt[13] {
        #[hal_cfg("pa13")]
        PA13,
        #[hal_cfg("pa25")]
        PA25,
        #[hal_cfg("pb13")]
        PB13,
    });

    ei!(ExtInt[14] {
        #[hal_cfg("pa14")]
        PA14,
        #[hal_cfg("pb14")]
        PB14,
        #[hal_cfg("pb30")]
        PB30,
    });

    ei!(ExtInt[15] {
        #[hal_cfg("pa15")]
        PA15,
        #[hal_cfg("pa27")]
        PA27,
        #[hal_cfg("pb15")]
        PB15,
        #[hal_cfg("pb31")]
        PB31,
    });
}