embassy/embassy-rp/src/gpio.rs

#![macro_use]
use core::future::Future;
use core::pin::Pin as FuturePin;
use core::task::{Context, Poll};

use embassy_cortex_m::interrupt::{Interrupt, InterruptExt};
use embassy_hal_common::{impl_peripheral, into_ref, PeripheralRef};
use embassy_sync::waitqueue::AtomicWaker;

use crate::pac::common::{Reg, RW};
use crate::pac::SIO;
use crate::{interrupt, pac, peripherals, Peripheral};

const PIN_COUNT: usize = 30;
const NEW_AW: AtomicWaker = AtomicWaker::new();
static INTERRUPT_WAKERS: [AtomicWaker; PIN_COUNT] = [NEW_AW; PIN_COUNT];

/// Represents a digital input or output level.
#[derive(Debug, Eq, PartialEq)]
pub enum Level {
    Low,
    High,
}

impl From<bool> for Level {
    fn from(val: bool) -> Self {
        match val {
            true => Self::High,
            false => Self::Low,
        }
    }
}

impl Into<bool> for Level {
    fn into(self) -> bool {
        match self {
            Level::Low => false,
            Level::High => true,
        }
    }
}

/// Represents a pull setting for an input.
#[derive(Debug, Eq, PartialEq)]
pub enum Pull {
    None,
    Up,
    Down,
}

/// A GPIO bank with up to 32 pins.
#[derive(Debug, Eq, PartialEq)]
pub enum Bank {
    Bank0 = 0,
    Qspi = 1,
}

pub struct Input<'d, T: Pin> {
    pin: Flex<'d, T>,
}

impl<'d, T: Pin> Input<'d, T> {
    #[inline]
    pub fn new(pin: impl Peripheral<P = T> + 'd, pull: Pull) -> Self {
        let mut pin = Flex::new(pin);
        pin.set_as_input();
        pin.set_pull(pull);
        Self { pin }
    }

    #[inline]
    pub fn is_high(&self) -> bool {
        self.pin.is_high()
    }

    #[inline]
    pub fn is_low(&self) -> bool {
        self.pin.is_low()
    }

    /// Returns current pin level
    #[inline]
    pub fn get_level(&self) -> Level {
        self.pin.get_level()
    }

    #[inline]
    pub async fn wait_for_high(&mut self) {
        self.pin.wait_for_high().await;
    }

    #[inline]
    pub async fn wait_for_low(&mut self) {
        self.pin.wait_for_low().await;
    }

    #[inline]
    pub async fn wait_for_rising_edge(&mut self) {
        self.pin.wait_for_rising_edge().await;
    }

    #[inline]
    pub async fn wait_for_falling_edge(&mut self) {
        self.pin.wait_for_falling_edge().await;
    }

    #[inline]
    pub async fn wait_for_any_edge(&mut self) {
        self.pin.wait_for_any_edge().await;
    }
}

/// Interrupt trigger levels.
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum InterruptTrigger {
    LevelLow,
    LevelHigh,
    EdgeLow,
    EdgeHigh,
    AnyEdge,
}

impl InterruptTrigger {
    fn from_u32(value: u32) -> Option<InterruptTrigger> {
        match value {
            1 => Some(InterruptTrigger::LevelLow),
            2 => Some(InterruptTrigger::LevelHigh),
            3 => Some(InterruptTrigger::EdgeLow),
            4 => Some(InterruptTrigger::EdgeHigh),
            _ => None,
        }
    }
}

#[interrupt]
unsafe fn IO_IRQ_BANK0() {
    let cpu = SIO.cpuid().read() as usize;
    // There are two sets of interrupt registers, one for cpu0 and one for cpu1
    // and here we are selecting the set that belongs to the currently executing
    // cpu.
    let proc_intx: pac::io::Int = pac::IO_BANK0.int_proc(cpu);
    for pin in 0..PIN_COUNT {
        // There are 4 raw interrupt status registers, PROCx_INTS0, PROCx_INTS1,
        // PROCx_INTS2, and PROCx_INTS3, and we are selecting the one that the
        // current pin belongs to.
        let intsx = proc_intx.ints(pin / 8);
        // The status register is divided into groups of four, one group for
        // each pin. Each group consists of four trigger levels LEVEL_LOW,
        // LEVEL_HIGH, EDGE_LOW, and EDGE_HIGH for each pin.
        let pin_group = (pin % 8) as usize;
        let event = (intsx.read().0 >> pin_group * 4) & 0xf as u32;

        if let Some(trigger) = InterruptTrigger::from_u32(event) {
            critical_section::with(|_| {
                proc_intx.inte(pin / 8).modify(|w| match trigger {
                    InterruptTrigger::AnyEdge => {
                        w.set_edge_high(pin_group, false);
                        w.set_edge_low(pin_group, false);
                    }
                    InterruptTrigger::LevelHigh => {
                        debug!("IO_IRQ_BANK0 pin {} LevelHigh triggered", pin);
                        w.set_level_high(pin_group, false);
                    }
                    InterruptTrigger::LevelLow => {
                        w.set_level_low(pin_group, false);
                    }
                    InterruptTrigger::EdgeHigh => {
                        w.set_edge_high(pin_group, false);
                    }
                    InterruptTrigger::EdgeLow => {
                        w.set_edge_low(pin_group, false);
                    }
                });
            });
            INTERRUPT_WAKERS[pin as usize].wake();
        }
    }
}

struct InputFuture<'a, T: Pin> {
    pin: PeripheralRef<'a, T>,
    level: InterruptTrigger,
}

impl<'d, T: Pin> InputFuture<'d, T> {
    pub fn new(pin: impl Peripheral<P = T> + 'd, level: InterruptTrigger) -> Self {
        into_ref!(pin);
        unsafe {
            let irq = interrupt::IO_IRQ_BANK0::steal();
            irq.disable();
            irq.set_priority(interrupt::Priority::P3);

            // Each INTR register is divided into 8 groups, one group for each
            // pin, and each group consists of LEVEL_LOW, LEVEL_HIGH, EDGE_LOW,
            // and EGDE_HIGH.
            let pin_group = (pin.pin() % 8) as usize;
            critical_section::with(|_| {
                pin.int_proc().inte((pin.pin() / 8) as usize).modify(|w| match level {
                    InterruptTrigger::LevelHigh => {
                        debug!("InputFuture::new enable LevelHigh for pin {}", pin.pin());
                        w.set_level_high(pin_group, true);
                    }
                    InterruptTrigger::LevelLow => {
                        w.set_level_low(pin_group, true);
                    }
                    InterruptTrigger::EdgeHigh => {
                        w.set_edge_high(pin_group, true);
                    }
                    InterruptTrigger::EdgeLow => {
                        w.set_edge_low(pin_group, true);
                    }
                    InterruptTrigger::AnyEdge => {
                        // noop
                    }
                });
            });

            irq.enable();
        }

        Self { pin, level }
    }
}

impl<'d, T: Pin> Future for InputFuture<'d, T> {
    type Output = ();

    fn poll(self: FuturePin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        // We need to register/re-register the waker for each poll because any
        // calls to wake will deregister the waker.
        INTERRUPT_WAKERS[self.pin.pin() as usize].register(cx.waker());

        // self.int_proc() will get the register offset for the current cpu,
        // then we want to access the interrupt enable register for our
        // pin (there are 4 of these PROC0_INTE0, PROC0_INTE1, PROC0_INTE2, and
        // PROC0_INTE3 per cpu).
        let inte: pac::io::regs::Int = unsafe { self.pin.int_proc().inte((self.pin.pin() / 8) as usize).read() };
        // The register is divided into groups of four, one group for
        // each pin. Each group consists of four trigger levels LEVEL_LOW,
        // LEVEL_HIGH, EDGE_LOW, and EDGE_HIGH for each pin.
        let pin_group = (self.pin.pin() % 8) as usize;

        // This should check the the level of the interrupt trigger level of
        // the pin and if it has been disabled that means it was done by the
        // interrupt service routine, so we then know that the event/trigger
        // happened and Poll::Ready will be returned.
        debug!("{:?} for pin {}", self.level, self.pin.pin());
        match self.level {
            InterruptTrigger::AnyEdge => {
                if !inte.edge_high(pin_group) && !inte.edge_low(pin_group) {
                    #[rustfmt::skip]
                    debug!("{:?} for pin {} was cleared, return Poll::Ready", self.level, self.pin.pin());
                    return Poll::Ready(());
                }
            }
            InterruptTrigger::LevelHigh => {
                if !inte.level_high(pin_group) {
                    #[rustfmt::skip]
                    debug!("{:?} for pin {} was cleared, return Poll::Ready", self.level, self.pin.pin());
                    return Poll::Ready(());
                }
            }
            InterruptTrigger::LevelLow => {
                if !inte.level_low(pin_group) {
                    #[rustfmt::skip]
                    debug!("{:?} for pin {} was cleared, return Poll::Ready", self.level, self.pin.pin());
                    return Poll::Ready(());
                }
            }
            InterruptTrigger::EdgeHigh => {
                if !inte.edge_high(pin_group) {
                    #[rustfmt::skip]
                    debug!("{:?} for pin {} was cleared, return Poll::Ready", self.level, self.pin.pin());
                    return Poll::Ready(());
                }
            }
            InterruptTrigger::EdgeLow => {
                if !inte.edge_low(pin_group) {
                    #[rustfmt::skip]
                    debug!("{:?} for pin {} was cleared, return Poll::Ready", self.level, self.pin.pin());
                    return Poll::Ready(());
                }
            }
        }
        debug!("InputFuture::poll return Poll::Pending");
        Poll::Pending
    }
}

pub struct Output<'d, T: Pin> {
    pin: Flex<'d, T>,
}

impl<'d, T: Pin> Output<'d, T> {
    #[inline]
    pub fn new(pin: impl Peripheral<P = T> + 'd, initial_output: Level) -> Self {
        let mut pin = Flex::new(pin);
        match initial_output {
            Level::High => pin.set_high(),
            Level::Low => pin.set_low(),
        }

        pin.set_as_output();
        Self { pin }
    }

    /// Set the output as high.
    #[inline]
    pub fn set_high(&mut self) {
        self.pin.set_high()
    }

    /// Set the output as low.
    #[inline]
    pub fn set_low(&mut self) {
        self.pin.set_low()
    }

    /// Set the output level.
    #[inline]
    pub fn set_level(&mut self, level: Level) {
        self.pin.set_level(level)
    }

    /// Is the output pin set as high?
    #[inline]
    pub fn is_set_high(&self) -> bool {
        self.pin.is_set_high()
    }

    /// Is the output pin set as low?
    #[inline]
    pub fn is_set_low(&self) -> bool {
        self.pin.is_set_low()
    }

    /// What level output is set to
    #[inline]
    pub fn get_output_level(&self) -> Level {
        self.pin.get_output_level()
    }

    /// Toggle pin output
    #[inline]
    pub fn toggle(&mut self) {
        self.pin.toggle()
    }
}

/// GPIO output open-drain.
pub struct OutputOpenDrain<'d, T: Pin> {
    pin: Flex<'d, T>,
}

impl<'d, T: Pin> OutputOpenDrain<'d, T> {
    #[inline]
    pub fn new(pin: impl Peripheral<P = T> + 'd, initial_output: Level) -> Self {
        let mut pin = Flex::new(pin);
        pin.set_low();
        match initial_output {
            Level::High => pin.set_as_input(),
            Level::Low => pin.set_as_output(),
        }
        Self { pin }
    }

    /// Set the output as high.
    #[inline]
    pub fn set_high(&mut self) {
        // For Open Drain High, disable the output pin.
        self.pin.set_as_input()
    }

    /// Set the output as low.
    #[inline]
    pub fn set_low(&mut self) {
        // For Open Drain Low, enable the output pin.
        self.pin.set_as_output()
    }

    /// Set the output level.
    #[inline]
    pub fn set_level(&mut self, level: Level) {
        match level {
            Level::Low => self.set_low(),
            Level::High => self.set_high(),
        }
    }

    /// Is the output level high?
    #[inline]
    pub fn is_set_high(&self) -> bool {
        !self.is_set_low()
    }

    /// Is the output level low?
    #[inline]
    pub fn is_set_low(&self) -> bool {
        self.pin.is_set_as_output()
    }

    /// What level output is set to
    #[inline]
    pub fn get_output_level(&self) -> Level {
        self.is_set_high().into()
    }

    /// Toggle pin output
    #[inline]
    pub fn toggle(&mut self) {
        self.pin.toggle_set_as_output()
    }
}

/// GPIO flexible pin.
///
/// This pin can be either an input or output pin. The output level register bit will remain
/// set while not in output mode, so the pin's level will be 'remembered' when it is not in output
/// mode.
pub struct Flex<'d, T: Pin> {
    pin: PeripheralRef<'d, T>,
}

impl<'d, T: Pin> Flex<'d, T> {
    #[inline]
    pub fn new(pin: impl Peripheral<P = T> + 'd) -> Self {
        into_ref!(pin);

        unsafe {
            pin.pad_ctrl().write(|w| {
                w.set_ie(true);
            });

            pin.io().ctrl().write(|w| {
                w.set_funcsel(pac::io::vals::Gpio0ctrlFuncsel::SIO_0.0);
            });
        }

        Self { pin }
    }

    #[inline]
    fn bit(&self) -> u32 {
        1 << self.pin.pin()
    }

    /// Set the pin's pull.
    #[inline]
    pub fn set_pull(&mut self, pull: Pull) {
        unsafe {
            self.pin.pad_ctrl().write(|w| {
                w.set_ie(true);
                match pull {
                    Pull::Up => w.set_pue(true),
                    Pull::Down => w.set_pde(true),
                    Pull::None => {}
                }
            });
        }
    }

    /// Put the pin into input mode.
    ///
    /// The pull setting is left unchanged.
    #[inline]
    pub fn set_as_input(&mut self) {
        unsafe { self.pin.sio_oe().value_clr().write_value(self.bit()) }
    }

    /// Put the pin into output mode.
    ///
    /// The pin level will be whatever was set before (or low by default). If you want it to begin
    /// at a specific level, call `set_high`/`set_low` on the pin first.
    #[inline]
    pub fn set_as_output(&mut self) {
        unsafe { self.pin.sio_oe().value_set().write_value(self.bit()) }
    }

    #[inline]
    fn is_set_as_output(&self) -> bool {
        unsafe { (self.pin.sio_oe().value().read() & self.bit()) != 0 }
    }

    #[inline]
    pub fn toggle_set_as_output(&mut self) {
        unsafe { self.pin.sio_oe().value_xor().write_value(self.bit()) }
    }

    #[inline]
    pub fn is_high(&self) -> bool {
        !self.is_low()
    }

    #[inline]
    pub fn is_low(&self) -> bool {
        unsafe { self.pin.sio_in().read() & self.bit() == 0 }
    }

    /// Returns current pin level
    #[inline]
    pub fn get_level(&self) -> Level {
        self.is_high().into()
    }

    /// Set the output as high.
    #[inline]
    pub fn set_high(&mut self) {
        unsafe { self.pin.sio_out().value_set().write_value(self.bit()) }
    }

    /// Set the output as low.
    #[inline]
    pub fn set_low(&mut self) {
        unsafe { self.pin.sio_out().value_clr().write_value(self.bit()) }
    }

    /// Set the output level.
    #[inline]
    pub fn set_level(&mut self, level: Level) {
        match level {
            Level::Low => self.set_low(),
            Level::High => self.set_high(),
        }
    }

    /// Is the output level high?
    #[inline]
    pub fn is_set_high(&self) -> bool {
        unsafe { (self.pin.sio_out().value().read() & self.bit()) == 0 }
    }

    /// Is the output level low?
    #[inline]
    pub fn is_set_low(&self) -> bool {
        !self.is_set_high()
    }

    /// What level output is set to
    #[inline]
    pub fn get_output_level(&self) -> Level {
        self.is_set_high().into()
    }

    /// Toggle pin output
    #[inline]
    pub fn toggle(&mut self) {
        unsafe { self.pin.sio_out().value_xor().write_value(self.bit()) }
    }

    #[inline]
    pub async fn wait_for_high(&mut self) {
        InputFuture::new(&mut self.pin, InterruptTrigger::LevelHigh).await;
    }

    #[inline]
    pub async fn wait_for_low(&mut self) {
        InputFuture::new(&mut self.pin, InterruptTrigger::LevelLow).await;
    }

    #[inline]
    pub async fn wait_for_rising_edge(&mut self) {
        self.wait_for_low().await;
        self.wait_for_high().await;
    }

    #[inline]
    pub async fn wait_for_falling_edge(&mut self) {
        self.wait_for_high().await;
        self.wait_for_low().await;
    }

    #[inline]
    pub async fn wait_for_any_edge(&mut self) {
        if self.is_high() {
            self.wait_for_low().await;
        } else {
            self.wait_for_high().await;
        }
    }
}

impl<'d, T: Pin> Drop for Flex<'d, T> {
    #[inline]
    fn drop(&mut self) {
        unsafe {
            self.pin.pad_ctrl().write(|_| {});
            self.pin.io().ctrl().write(|w| {
                w.set_funcsel(pac::io::vals::Gpio0ctrlFuncsel::NULL.0);
            });
        }
    }
}

pub(crate) mod sealed {
    use super::*;

    pub trait Pin: Sized {
        fn pin_bank(&self) -> u8;

        #[inline]
        fn _pin(&self) -> u8 {
            self.pin_bank() & 0x1f
        }

        #[inline]
        fn _bank(&self) -> Bank {
            if self.pin_bank() & 0x20 == 0 {
                Bank::Bank0
            } else {
                Bank::Qspi
            }
        }

        fn io(&self) -> pac::io::Gpio {
            let block = match self._bank() {
                Bank::Bank0 => crate::pac::IO_BANK0,
                Bank::Qspi => crate::pac::IO_QSPI,
            };
            block.gpio(self._pin() as _)
        }

        fn pad_ctrl(&self) -> Reg<pac::pads::regs::GpioCtrl, RW> {
            let block = match self._bank() {
                Bank::Bank0 => crate::pac::PADS_BANK0,
                Bank::Qspi => crate::pac::PADS_QSPI,
            };
            block.gpio(self._pin() as _)
        }

        fn sio_out(&self) -> pac::sio::Gpio {
            SIO.gpio_out(self._bank() as _)
        }

        fn sio_oe(&self) -> pac::sio::Gpio {
            SIO.gpio_oe(self._bank() as _)
        }

        fn sio_in(&self) -> Reg<u32, RW> {
            SIO.gpio_in(self._bank() as _)
        }

        fn int_proc(&self) -> pac::io::Int {
            let io_block = match self._bank() {
                Bank::Bank0 => crate::pac::IO_BANK0,
                Bank::Qspi => crate::pac::IO_QSPI,
            };
            let proc = unsafe { SIO.cpuid().read() };
            io_block.int_proc(proc as _)
        }
    }
}

pub trait Pin: Peripheral<P = Self> + Into<AnyPin> + sealed::Pin + Sized + 'static {
    /// Degrade to a generic pin struct
    fn degrade(self) -> AnyPin {
        AnyPin {
            pin_bank: self.pin_bank(),
        }
    }

    /// Returns the pin number within a bank
    #[inline]
    fn pin(&self) -> u8 {
        self._pin()
    }

    /// Returns the bank of this pin
    #[inline]
    fn bank(&self) -> Bank {
        self._bank()
    }
}

pub struct AnyPin {
    pin_bank: u8,
}

impl_peripheral!(AnyPin);

impl Pin for AnyPin {}
impl sealed::Pin for AnyPin {
    fn pin_bank(&self) -> u8 {
        self.pin_bank
    }
}

// ==========================

macro_rules! impl_pin {
    ($name:ident, $bank:expr, $pin_num:expr) => {
        impl Pin for peripherals::$name {}
        impl sealed::Pin for peripherals::$name {
            fn pin_bank(&self) -> u8 {
                ($bank as u8) * 32 + $pin_num
            }
        }

        impl From<peripherals::$name> for crate::gpio::AnyPin {
            fn from(val: peripherals::$name) -> Self {
                crate::gpio::Pin::degrade(val)
            }
        }
    };
}

impl_pin!(PIN_0, Bank::Bank0, 0);
impl_pin!(PIN_1, Bank::Bank0, 1);
impl_pin!(PIN_2, Bank::Bank0, 2);
impl_pin!(PIN_3, Bank::Bank0, 3);
impl_pin!(PIN_4, Bank::Bank0, 4);
impl_pin!(PIN_5, Bank::Bank0, 5);
impl_pin!(PIN_6, Bank::Bank0, 6);
impl_pin!(PIN_7, Bank::Bank0, 7);
impl_pin!(PIN_8, Bank::Bank0, 8);
impl_pin!(PIN_9, Bank::Bank0, 9);
impl_pin!(PIN_10, Bank::Bank0, 10);
impl_pin!(PIN_11, Bank::Bank0, 11);
impl_pin!(PIN_12, Bank::Bank0, 12);
impl_pin!(PIN_13, Bank::Bank0, 13);
impl_pin!(PIN_14, Bank::Bank0, 14);
impl_pin!(PIN_15, Bank::Bank0, 15);
impl_pin!(PIN_16, Bank::Bank0, 16);
impl_pin!(PIN_17, Bank::Bank0, 17);
impl_pin!(PIN_18, Bank::Bank0, 18);
impl_pin!(PIN_19, Bank::Bank0, 19);
impl_pin!(PIN_20, Bank::Bank0, 20);
impl_pin!(PIN_21, Bank::Bank0, 21);
impl_pin!(PIN_22, Bank::Bank0, 22);
impl_pin!(PIN_23, Bank::Bank0, 23);
impl_pin!(PIN_24, Bank::Bank0, 24);
impl_pin!(PIN_25, Bank::Bank0, 25);
impl_pin!(PIN_26, Bank::Bank0, 26);
impl_pin!(PIN_27, Bank::Bank0, 27);
impl_pin!(PIN_28, Bank::Bank0, 28);
impl_pin!(PIN_29, Bank::Bank0, 29);

impl_pin!(PIN_QSPI_SCLK, Bank::Qspi, 0);
impl_pin!(PIN_QSPI_SS, Bank::Qspi, 1);
impl_pin!(PIN_QSPI_SD0, Bank::Qspi, 2);
impl_pin!(PIN_QSPI_SD1, Bank::Qspi, 3);
impl_pin!(PIN_QSPI_SD2, Bank::Qspi, 4);
impl_pin!(PIN_QSPI_SD3, Bank::Qspi, 5);

// ====================

mod eh02 {
    use core::convert::Infallible;

    use super::*;

    impl<'d, T: Pin> embedded_hal_02::digital::v2::InputPin for Input<'d, T> {
        type Error = Infallible;

        fn is_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_high())
        }

        fn is_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::OutputPin for Output<'d, T> {
        type Error = Infallible;

        fn set_high(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_high())
        }

        fn set_low(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::StatefulOutputPin for Output<'d, T> {
        fn is_set_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_high())
        }

        fn is_set_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::ToggleableOutputPin for Output<'d, T> {
        type Error = Infallible;
        #[inline]
        fn toggle(&mut self) -> Result<(), Self::Error> {
            Ok(self.toggle())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::OutputPin for OutputOpenDrain<'d, T> {
        type Error = Infallible;

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

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

    impl<'d, T: Pin> embedded_hal_02::digital::v2::StatefulOutputPin for OutputOpenDrain<'d, T> {
        fn is_set_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_high())
        }

        fn is_set_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::ToggleableOutputPin for OutputOpenDrain<'d, T> {
        type Error = Infallible;
        #[inline]
        fn toggle(&mut self) -> Result<(), Self::Error> {
            Ok(self.toggle())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::InputPin for Flex<'d, T> {
        type Error = Infallible;

        fn is_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_high())
        }

        fn is_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::OutputPin for Flex<'d, T> {
        type Error = Infallible;

        fn set_high(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_high())
        }

        fn set_low(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::StatefulOutputPin for Flex<'d, T> {
        fn is_set_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_high())
        }

        fn is_set_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_02::digital::v2::ToggleableOutputPin for Flex<'d, T> {
        type Error = Infallible;
        #[inline]
        fn toggle(&mut self) -> Result<(), Self::Error> {
            Ok(self.toggle())
        }
    }
}

#[cfg(feature = "unstable-traits")]
mod eh1 {
    use core::convert::Infallible;

    use super::*;

    impl<'d, T: Pin> embedded_hal_1::digital::ErrorType for Input<'d, T> {
        type Error = Infallible;
    }

    impl<'d, T: Pin> embedded_hal_1::digital::InputPin for Input<'d, T> {
        fn is_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_high())
        }

        fn is_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::ErrorType for Output<'d, T> {
        type Error = Infallible;
    }

    impl<'d, T: Pin> embedded_hal_1::digital::OutputPin for Output<'d, T> {
        fn set_high(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_high())
        }

        fn set_low(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::StatefulOutputPin for Output<'d, T> {
        fn is_set_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_high())
        }

        fn is_set_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::ToggleableOutputPin for Output<'d, T> {
        fn toggle(&mut self) -> Result<(), Self::Error> {
            Ok(self.toggle())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::ErrorType for OutputOpenDrain<'d, T> {
        type Error = Infallible;
    }

    impl<'d, T: Pin> embedded_hal_1::digital::OutputPin for OutputOpenDrain<'d, T> {
        fn set_high(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_high())
        }

        fn set_low(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::StatefulOutputPin for OutputOpenDrain<'d, T> {
        fn is_set_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_high())
        }

        fn is_set_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::ToggleableOutputPin for OutputOpenDrain<'d, T> {
        fn toggle(&mut self) -> Result<(), Self::Error> {
            Ok(self.toggle())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::ErrorType for Flex<'d, T> {
        type Error = Infallible;
    }

    impl<'d, T: Pin> embedded_hal_1::digital::InputPin for Flex<'d, T> {
        fn is_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_high())
        }

        fn is_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::OutputPin for Flex<'d, T> {
        fn set_high(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_high())
        }

        fn set_low(&mut self) -> Result<(), Self::Error> {
            Ok(self.set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::StatefulOutputPin for Flex<'d, T> {
        fn is_set_high(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_high())
        }

        fn is_set_low(&self) -> Result<bool, Self::Error> {
            Ok(self.is_set_low())
        }
    }

    impl<'d, T: Pin> embedded_hal_1::digital::ToggleableOutputPin for Flex<'d, T> {
        fn toggle(&mut self) -> Result<(), Self::Error> {
            Ok(self.toggle())
        }
    }

    #[cfg(feature = "nightly")]
    impl<'d, T: Pin> embedded_hal_async::digital::Wait for Flex<'d, T> {
        async fn wait_for_high(&mut self) -> Result<(), Self::Error> {
            self.wait_for_high().await;
            Ok(())
        }

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

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

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

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

    #[cfg(feature = "nightly")]
    impl<'d, T: Pin> embedded_hal_async::digital::Wait for Input<'d, T> {
        async fn wait_for_high(&mut self) -> Result<(), Self::Error> {
            self.wait_for_high().await;
            Ok(())
        }

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

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

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

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