use core::future::poll_fn;
use core::marker::PhantomData;
use core::ops::{Deref, DerefMut};
use core::task::Poll;

use cfg_if::cfg_if;
use embassy_hal_internal::{into_ref, PeripheralRef};
pub use fdcan::frame::{FrameFormat, RxFrameInfo, TxFrameHeader};
pub use fdcan::id::{ExtendedId, Id, StandardId};
use fdcan::message_ram::RegisterBlock;
use fdcan::{self, LastErrorCode};
pub use fdcan::{config, filter};

use crate::gpio::sealed::AFType;
use crate::interrupt::typelevel::Interrupt;
use crate::rcc::RccPeripheral;
use crate::{interrupt, peripherals, Peripheral};

pub mod enums;
use enums::*;
pub mod util;

/// CAN Frame returned by read
pub struct RxFrame {
    /// CAN Header info: frame ID, data length and other meta
    pub header: RxFrameInfo,
    /// CAN(0-8 bytes) or FDCAN(0-64 bytes) Frame data
    pub data: Data,
    /// Reception time.
    #[cfg(feature = "time")]
    pub timestamp: embassy_time::Instant,
}

/// CAN frame used for write
pub struct TxFrame {
    /// CAN Header info: frame ID, data length and other meta
    pub header: TxFrameHeader,
    /// CAN(0-8 bytes) or FDCAN(0-64 bytes) Frame data
    pub data: Data,
}

impl TxFrame {
    /// Create new TX frame from header and data
    pub fn new(header: TxFrameHeader, data: &[u8]) -> Option<Self> {
        if data.len() < header.len as usize {
            return None;
        }

        let Some(data) = Data::new(data) else { return None };

        Some(TxFrame { header, data })
    }

    fn from_preserved(header: TxFrameHeader, data32: &[u32]) -> Option<Self> {
        let mut data = [0u8; 64];

        for i in 0..data32.len() {
            data[4 * i..][..4].copy_from_slice(&data32[i].to_le_bytes());
        }

        let Some(data) = Data::new(&data) else { return None };

        Some(TxFrame { header, data })
    }

    /// Access frame data. Slice length will match header.
    pub fn data(&self) -> &[u8] {
        &self.data.bytes[..(self.header.len as usize)]
    }
}

impl RxFrame {
    pub(crate) fn new(
        header: RxFrameInfo,
        data: &[u8],
        #[cfg(feature = "time")] timestamp: embassy_time::Instant,
    ) -> Self {
        let data = Data::new(&data).unwrap_or_else(|| Data::empty());

        RxFrame {
            header,
            data,
            #[cfg(feature = "time")]
            timestamp,
        }
    }

    /// Access frame data. Slice length will match header.
    pub fn data(&self) -> &[u8] {
        &self.data.bytes[..(self.header.len as usize)]
    }
}

/// Payload of a (FD)CAN data frame.
///
/// Contains 0 to 64 Bytes of data.
#[derive(Debug, Copy, Clone)]
pub struct Data {
    pub(crate) bytes: [u8; 64],
}

impl Data {
    /// Creates a data payload from a raw byte slice.
    ///
    /// Returns `None` if `data` is more than 64 bytes (which is the maximum) or
    /// cannot be represented with an FDCAN DLC.
    pub fn new(data: &[u8]) -> Option<Self> {
        if !Data::is_valid_len(data.len()) {
            return None;
        }

        let mut bytes = [0; 64];
        bytes[..data.len()].copy_from_slice(data);

        Some(Self { bytes })
    }

    /// Raw read access to data.
    pub fn raw(&self) -> &[u8] {
        &self.bytes
    }

    /// Checks if the length can be encoded in FDCAN DLC field.
    pub const fn is_valid_len(len: usize) -> bool {
        match len {
            0..=8 => true,
            12 => true,
            16 => true,
            20 => true,
            24 => true,
            32 => true,
            48 => true,
            64 => true,
            _ => false,
        }
    }

    /// Creates an empty data payload containing 0 bytes.
    #[inline]
    pub const fn empty() -> Self {
        Self { bytes: [0; 64] }
    }
}

/// Interrupt handler channel 0.
pub struct IT0InterruptHandler<T: Instance> {
    _phantom: PhantomData<T>,
}

// We use IT0 for everything currently
impl<T: Instance> interrupt::typelevel::Handler<T::IT0Interrupt> for IT0InterruptHandler<T> {
    unsafe fn on_interrupt() {
        let regs = T::regs();

        let ir = regs.ir().read();

        if ir.tc() {
            regs.ir().write(|w| w.set_tc(true));
            T::state().tx_waker.wake();
        }

        if ir.tefn() {
            regs.ir().write(|w| w.set_tefn(true));
            T::state().tx_waker.wake();
        }

        if ir.ped() || ir.pea() {
            regs.ir().write(|w| {
                w.set_ped(true);
                w.set_pea(true);
            });
        }

        if ir.rfn(0) {
            regs.ir().write(|w| w.set_rfn(0, true));
            T::state().rx_waker.wake();
        }

        if ir.rfn(1) {
            regs.ir().write(|w| w.set_rfn(1, true));
            T::state().rx_waker.wake();
        }
    }
}

/// Interrupt handler channel 1.
pub struct IT1InterruptHandler<T: Instance> {
    _phantom: PhantomData<T>,
}

impl<T: Instance> interrupt::typelevel::Handler<T::IT1Interrupt> for IT1InterruptHandler<T> {
    unsafe fn on_interrupt() {}
}

impl BusError {
    fn try_from(lec: LastErrorCode) -> Option<BusError> {
        match lec {
            LastErrorCode::AckError => Some(BusError::Acknowledge),
            // `0` data bit encodes a dominant state. `1` data bit is recessive.
            // Bit0Error: During transmit, the node wanted to send a 0 but monitored a 1
            LastErrorCode::Bit0Error => Some(BusError::BitRecessive),
            LastErrorCode::Bit1Error => Some(BusError::BitDominant),
            LastErrorCode::CRCError => Some(BusError::Crc),
            LastErrorCode::FormError => Some(BusError::Form),
            LastErrorCode::StuffError => Some(BusError::Stuff),
            _ => None,
        }
    }
}

/// Operating modes trait
pub trait FdcanOperatingMode {}
impl FdcanOperatingMode for fdcan::PoweredDownMode {}
impl FdcanOperatingMode for fdcan::ConfigMode {}
impl FdcanOperatingMode for fdcan::InternalLoopbackMode {}
impl FdcanOperatingMode for fdcan::ExternalLoopbackMode {}
impl FdcanOperatingMode for fdcan::NormalOperationMode {}
impl FdcanOperatingMode for fdcan::RestrictedOperationMode {}
impl FdcanOperatingMode for fdcan::BusMonitoringMode {}
impl FdcanOperatingMode for fdcan::TestMode {}

/// FDCAN Instance
pub struct Fdcan<'d, T: Instance, M: FdcanOperatingMode> {
    /// Reference to internals.
    pub can: fdcan::FdCan<FdcanInstance<'d, T>, M>,
    ns_per_timer_tick: u64, // For FDCAN internal timer
}

fn calc_ns_per_timer_tick<T: Instance>(mode: config::FrameTransmissionConfig) -> u64 {
    match mode {
        // Use timestamp from Rx FIFO to adjust timestamp reported to user
        config::FrameTransmissionConfig::ClassicCanOnly => {
            let freq = T::frequency();
            let prescale: u64 =
                ({ T::regs().nbtp().read().nbrp() } + 1) as u64 * ({ T::regs().tscc().read().tcp() } + 1) as u64;
            1_000_000_000 as u64 / (freq.0 as u64 * prescale)
        }
        // For VBR this is too hard because the FDCAN timer switches clock rate you need to configure to use
        // timer3 instead which is too hard to do from this module.
        _ => 0,
    }
}

#[cfg(feature = "time")]
fn calc_timestamp<T: Instance>(ns_per_timer_tick: u64, ts_val: u16) -> embassy_time::Instant {
    let now_embassy = embassy_time::Instant::now();
    if ns_per_timer_tick == 0 {
        return now_embassy;
    }
    let now_can = { T::regs().tscv().read().tsc() };
    let delta = now_can.overflowing_sub(ts_val).0 as u64;
    let ns = ns_per_timer_tick * delta as u64;
    now_embassy - embassy_time::Duration::from_nanos(ns)
}

fn curr_error<T: Instance>() -> Option<BusError> {
    let err = { T::regs().psr().read() };
    if err.bo() {
        return Some(BusError::BusOff);
    } else if err.ep() {
        return Some(BusError::BusPassive);
    } else if err.ew() {
        return Some(BusError::BusWarning);
    } else {
        cfg_if! {
            if #[cfg(stm32h7)] {
                let lec = err.lec();
            } else {
                let lec = err.lec().to_bits();
            }
        }
        if let Ok(err) = LastErrorCode::try_from(lec) {
            return BusError::try_from(err);
        }
    }
    None
}

impl<'d, T: Instance> Fdcan<'d, T, fdcan::ConfigMode> {
    /// Creates a new Fdcan instance, keeping the peripheral in sleep mode.
    /// You must call [Fdcan::enable_non_blocking] to use the peripheral.
    pub fn new(
        peri: impl Peripheral<P = T> + 'd,
        rx: impl Peripheral<P = impl RxPin<T>> + 'd,
        tx: impl Peripheral<P = impl TxPin<T>> + 'd,
        _irqs: impl interrupt::typelevel::Binding<T::IT0Interrupt, IT0InterruptHandler<T>>
            + interrupt::typelevel::Binding<T::IT1Interrupt, IT1InterruptHandler<T>>
            + 'd,
    ) -> Fdcan<'d, T, fdcan::ConfigMode> {
        into_ref!(peri, rx, tx);

        rx.set_as_af(rx.af_num(), AFType::Input);
        tx.set_as_af(tx.af_num(), AFType::OutputPushPull);

        T::enable_and_reset();

        rx.set_as_af(rx.af_num(), AFType::Input);
        tx.set_as_af(tx.af_num(), AFType::OutputPushPull);

        let mut can = fdcan::FdCan::new(FdcanInstance(peri)).into_config_mode();

        T::configure_msg_ram();
        unsafe {
            // Enable timestamping
            #[cfg(not(stm32h7))]
            T::regs()
                .tscc()
                .write(|w| w.set_tss(stm32_metapac::can::vals::Tss::INCREMENT));
            #[cfg(stm32h7)]
            T::regs().tscc().write(|w| w.set_tss(0x01));

            T::IT0Interrupt::unpend(); // Not unsafe
            T::IT0Interrupt::enable();

            T::IT1Interrupt::unpend(); // Not unsafe
            T::IT1Interrupt::enable();

            // this isn't really documented in the reference manual
            // but corresponding txbtie bit has to be set for the TC (TxComplete) interrupt to fire
            T::regs().txbtie().write(|w| w.0 = 0xffff_ffff);
        }

        can.enable_interrupt(fdcan::interrupt::Interrupt::RxFifo0NewMsg);
        can.enable_interrupt(fdcan::interrupt::Interrupt::RxFifo1NewMsg);
        can.enable_interrupt(fdcan::interrupt::Interrupt::TxComplete);
        can.enable_interrupt_line(fdcan::interrupt::InterruptLine::_0, true);
        can.enable_interrupt_line(fdcan::interrupt::InterruptLine::_1, true);

        let ns_per_timer_tick = calc_ns_per_timer_tick::<T>(can.get_config().frame_transmit);
        Self { can, ns_per_timer_tick }
    }

    /// Configures the bit timings calculated from supplied bitrate.
    pub fn set_bitrate(&mut self, bitrate: u32) {
        let bit_timing = util::calc_can_timings(T::frequency(), bitrate).unwrap();
        self.can.set_nominal_bit_timing(config::NominalBitTiming {
            sync_jump_width: bit_timing.sync_jump_width,
            prescaler: bit_timing.prescaler,
            seg1: bit_timing.seg1,
            seg2: bit_timing.seg2,
        });
    }
}

macro_rules! impl_transition {
    ($from_mode:ident, $to_mode:ident, $name:ident, $func: ident) => {
        impl<'d, T: Instance> Fdcan<'d, T, fdcan::$from_mode> {
            /// Transition from $from_mode:ident mode to $to_mode:ident mode
            pub fn $name(self) -> Fdcan<'d, T, fdcan::$to_mode> {
                let ns_per_timer_tick = calc_ns_per_timer_tick::<T>(self.can.get_config().frame_transmit);
                Fdcan {
                    can: self.can.$func(),
                    ns_per_timer_tick,
                }
            }
        }
    };
}

impl_transition!(PoweredDownMode, ConfigMode, into_config_mode, into_config_mode);
impl_transition!(InternalLoopbackMode, ConfigMode, into_config_mode, into_config_mode);

impl_transition!(ConfigMode, NormalOperationMode, into_normal_mode, into_normal);
impl_transition!(
    ConfigMode,
    ExternalLoopbackMode,
    into_external_loopback_mode,
    into_external_loopback
);
impl_transition!(
    ConfigMode,
    InternalLoopbackMode,
    into_internal_loopback_mode,
    into_internal_loopback
);

impl<'d, T: Instance, M: FdcanOperatingMode> Fdcan<'d, T, M>
where
    M: fdcan::Transmit,
    M: fdcan::Receive,
{
    /// Queues the message to be sent but exerts backpressure.  If a lower-priority
    /// frame is dropped from the mailbox, it is returned.  If no lower-priority frames
    /// can be replaced, this call asynchronously waits for a frame to be successfully
    /// transmitted, then tries again.
    pub async fn write(&mut self, frame: &TxFrame) -> Option<TxFrame> {
        poll_fn(|cx| {
            T::state().tx_waker.register(cx.waker());
            if let Ok(dropped) = self
                .can
                .transmit_preserve(frame.header, &frame.data.bytes, &mut |_, hdr, data32| {
                    TxFrame::from_preserved(hdr, data32)
                })
            {
                return Poll::Ready(dropped.flatten());
            }

            // Couldn't replace any lower priority frames.  Need to wait for some mailboxes
            // to clear.
            Poll::Pending
        })
        .await
    }

    /// Flush one of the TX mailboxes.
    pub async fn flush(&self, mb: fdcan::Mailbox) {
        poll_fn(|cx| {
            T::state().tx_waker.register(cx.waker());

            let idx: u8 = mb.into();
            let idx = 1 << idx;
            if !T::regs().txbrp().read().trp(idx) {
                return Poll::Ready(());
            }

            Poll::Pending
        })
        .await;
    }

    /// Returns the next received message frame
    pub async fn read(&mut self) -> Result<RxFrame, BusError> {
        poll_fn(|cx| {
            T::state().err_waker.register(cx.waker());
            T::state().rx_waker.register(cx.waker());

            let mut buffer: [u8; 64] = [0; 64];
            if let Ok(rx) = self.can.receive0(&mut buffer) {
                // rx: fdcan::ReceiveOverrun<RxFrameInfo>
                // TODO: report overrun?
                //  for now we just drop it

                let frame: RxFrame = RxFrame::new(
                    rx.unwrap(),
                    &buffer,
                    #[cfg(feature = "time")]
                    calc_timestamp::<T>(self.ns_per_timer_tick, rx.unwrap().time_stamp),
                );
                return Poll::Ready(Ok(frame));
            } else if let Ok(rx) = self.can.receive1(&mut buffer) {
                // rx: fdcan::ReceiveOverrun<RxFrameInfo>
                // TODO: report overrun?
                //  for now we just drop it

                let frame: RxFrame = RxFrame::new(
                    rx.unwrap(),
                    &buffer,
                    #[cfg(feature = "time")]
                    calc_timestamp::<T>(self.ns_per_timer_tick, rx.unwrap().time_stamp),
                );
                return Poll::Ready(Ok(frame));
            } else if let Some(err) = curr_error::<T>() {
                // TODO: this is probably wrong
                return Poll::Ready(Err(err));
            }
            Poll::Pending
        })
        .await
    }

    /// Split instance into separate Tx(write) and Rx(read) portions
    pub fn split<'c>(&'c mut self) -> (FdcanTx<'c, 'd, T, M>, FdcanRx<'c, 'd, T, M>) {
        let (mut _control, tx, rx0, rx1) = self.can.split_by_ref();
        (
            FdcanTx { _control, tx },
            FdcanRx {
                rx0,
                rx1,
                ns_per_timer_tick: self.ns_per_timer_tick,
            },
        )
    }
}

/// FDCAN Tx only Instance
pub struct FdcanTx<'c, 'd, T: Instance, M: fdcan::Transmit> {
    _control: &'c mut fdcan::FdCanControl<FdcanInstance<'d, T>, M>,
    tx: &'c mut fdcan::Tx<FdcanInstance<'d, T>, M>,
}

impl<'c, 'd, T: Instance, M: fdcan::Transmit> FdcanTx<'c, 'd, T, M> {
    /// Queues the message to be sent but exerts backpressure.  If a lower-priority
    /// frame is dropped from the mailbox, it is returned.  If no lower-priority frames
    /// can be replaced, this call asynchronously waits for a frame to be successfully
    /// transmitted, then tries again.
    pub async fn write(&mut self, frame: &TxFrame) -> Option<TxFrame> {
        poll_fn(|cx| {
            T::state().tx_waker.register(cx.waker());
            if let Ok(dropped) = self
                .tx
                .transmit_preserve(frame.header, &frame.data.bytes, &mut |_, hdr, data32| {
                    TxFrame::from_preserved(hdr, data32)
                })
            {
                return Poll::Ready(dropped.flatten());
            }

            // Couldn't replace any lower priority frames.  Need to wait for some mailboxes
            // to clear.
            Poll::Pending
        })
        .await
    }
}

/// FDCAN Rx only Instance
#[allow(dead_code)]
pub struct FdcanRx<'c, 'd, T: Instance, M: fdcan::Receive> {
    rx0: &'c mut fdcan::Rx<FdcanInstance<'d, T>, M, fdcan::Fifo0>,
    rx1: &'c mut fdcan::Rx<FdcanInstance<'d, T>, M, fdcan::Fifo1>,
    ns_per_timer_tick: u64, // For FDCAN internal timer
}

impl<'c, 'd, T: Instance, M: fdcan::Receive> FdcanRx<'c, 'd, T, M> {
    /// Returns the next received message frame
    pub async fn read(&mut self) -> Result<RxFrame, BusError> {
        poll_fn(|cx| {
            T::state().err_waker.register(cx.waker());
            T::state().rx_waker.register(cx.waker());

            let mut buffer: [u8; 64] = [0; 64];
            if let Ok(rx) = self.rx0.receive(&mut buffer) {
                // rx: fdcan::ReceiveOverrun<RxFrameInfo>
                // TODO: report overrun?
                //  for now we just drop it
                let frame: RxFrame = RxFrame::new(
                    rx.unwrap(),
                    &buffer,
                    #[cfg(feature = "time")]
                    calc_timestamp::<T>(self.ns_per_timer_tick, rx.unwrap().time_stamp),
                );
                return Poll::Ready(Ok(frame));
            } else if let Ok(rx) = self.rx1.receive(&mut buffer) {
                // rx: fdcan::ReceiveOverrun<RxFrameInfo>
                // TODO: report overrun?
                //  for now we just drop it
                let frame: RxFrame = RxFrame::new(
                    rx.unwrap(),
                    &buffer,
                    #[cfg(feature = "time")]
                    calc_timestamp::<T>(self.ns_per_timer_tick, rx.unwrap().time_stamp),
                );
                return Poll::Ready(Ok(frame));
            } else if let Some(err) = curr_error::<T>() {
                // TODO: this is probably wrong
                return Poll::Ready(Err(err));
            }

            Poll::Pending
        })
        .await
    }
}
impl<'d, T: Instance, M: FdcanOperatingMode> Deref for Fdcan<'d, T, M> {
    type Target = fdcan::FdCan<FdcanInstance<'d, T>, M>;

    fn deref(&self) -> &Self::Target {
        &self.can
    }
}

impl<'d, T: Instance, M: FdcanOperatingMode> DerefMut for Fdcan<'d, T, M> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.can
    }
}

pub(crate) mod sealed {
    use embassy_sync::waitqueue::AtomicWaker;

    pub struct State {
        pub tx_waker: AtomicWaker,
        pub err_waker: AtomicWaker,
        pub rx_waker: AtomicWaker,
    }

    impl State {
        pub const fn new() -> Self {
            Self {
                tx_waker: AtomicWaker::new(),
                err_waker: AtomicWaker::new(),
                rx_waker: AtomicWaker::new(),
            }
        }
    }

    pub trait Instance {
        const REGISTERS: *mut fdcan::RegisterBlock;
        const MSG_RAM: *mut fdcan::message_ram::RegisterBlock;
        const MSG_RAM_OFFSET: usize;

        fn regs() -> &'static crate::pac::can::Fdcan;
        fn state() -> &'static State;

        #[cfg(not(stm32h7))]
        fn configure_msg_ram() {}

        #[cfg(stm32h7)]
        fn configure_msg_ram() {
            let r = Self::regs();

            use fdcan::message_ram::*;
            let mut offset_words = Self::MSG_RAM_OFFSET as u16;

            // 11-bit filter
            r.sidfc().modify(|w| w.set_flssa(offset_words));
            offset_words += STANDARD_FILTER_MAX as u16;

            // 29-bit filter
            r.xidfc().modify(|w| w.set_flesa(offset_words));
            offset_words += 2 * EXTENDED_FILTER_MAX as u16;

            // Rx FIFO 0 and 1
            for i in 0..=1 {
                r.rxfc(i).modify(|w| {
                    w.set_fsa(offset_words);
                    w.set_fs(RX_FIFO_MAX);
                    w.set_fwm(RX_FIFO_MAX);
                });
                offset_words += 18 * RX_FIFO_MAX as u16;
            }

            // Rx buffer - see below
            // Tx event FIFO
            r.txefc().modify(|w| {
                w.set_efsa(offset_words);
                w.set_efs(TX_EVENT_MAX);
                w.set_efwm(TX_EVENT_MAX);
            });
            offset_words += 2 * TX_EVENT_MAX as u16;

            // Tx buffers
            r.txbc().modify(|w| {
                w.set_tbsa(offset_words);
                w.set_tfqs(TX_FIFO_MAX);
            });
            offset_words += 18 * TX_FIFO_MAX as u16;

            // Rx Buffer - not used
            r.rxbc().modify(|w| {
                w.set_rbsa(offset_words);
            });

            // TX event FIFO?
            // Trigger memory?

            // Set the element sizes to 16 bytes
            r.rxesc().modify(|w| {
                w.set_rbds(0b111);
                for i in 0..=1 {
                    w.set_fds(i, 0b111);
                }
            });
            r.txesc().modify(|w| {
                w.set_tbds(0b111);
            })
        }
    }
}

/// Trait for FDCAN interrupt channel 0
pub trait IT0Instance {
    /// Type for FDCAN interrupt channel 0
    type IT0Interrupt: crate::interrupt::typelevel::Interrupt;
}

/// Trait for FDCAN interrupt channel 1
pub trait IT1Instance {
    /// Type for FDCAN interrupt channel 1
    type IT1Interrupt: crate::interrupt::typelevel::Interrupt;
}

/// InterruptableInstance trait
pub trait InterruptableInstance: IT0Instance + IT1Instance {}
/// Instance trait
pub trait Instance: sealed::Instance + RccPeripheral + InterruptableInstance + 'static {}
/// Fdcan Instance struct
pub struct FdcanInstance<'a, T>(PeripheralRef<'a, T>);

unsafe impl<'d, T: Instance> fdcan::message_ram::Instance for FdcanInstance<'d, T> {
    const MSG_RAM: *mut RegisterBlock = T::MSG_RAM;
}

unsafe impl<'d, T: Instance> fdcan::Instance for FdcanInstance<'d, T>
where
    FdcanInstance<'d, T>: fdcan::message_ram::Instance,
{
    const REGISTERS: *mut fdcan::RegisterBlock = T::REGISTERS;
}

macro_rules! impl_fdcan {
    ($inst:ident, $msg_ram_inst:ident, $msg_ram_offset:literal) => {
        impl sealed::Instance for peripherals::$inst {
            const REGISTERS: *mut fdcan::RegisterBlock = crate::pac::$inst.as_ptr() as *mut _;
            const MSG_RAM: *mut fdcan::message_ram::RegisterBlock = crate::pac::$msg_ram_inst.as_ptr() as *mut _;
            const MSG_RAM_OFFSET: usize = $msg_ram_offset;

            fn regs() -> &'static crate::pac::can::Fdcan {
                &crate::pac::$inst
            }

            fn state() -> &'static sealed::State {
                static STATE: sealed::State = sealed::State::new();
                &STATE
            }
        }

        impl Instance for peripherals::$inst {}

        foreach_interrupt!(
            ($inst,can,FDCAN,IT0,$irq:ident) => {
                impl IT0Instance for peripherals::$inst {
                    type IT0Interrupt = crate::interrupt::typelevel::$irq;
                }
            };
            ($inst,can,FDCAN,IT1,$irq:ident) => {
                impl IT1Instance for peripherals::$inst {
                    type IT1Interrupt = crate::interrupt::typelevel::$irq;
                }
            };
        );

        impl InterruptableInstance for peripherals::$inst {}
    };

    ($inst:ident, $msg_ram_inst:ident) => {
        impl_fdcan!($inst, $msg_ram_inst, 0);
    };
}

#[cfg(not(stm32h7))]
foreach_peripheral!(
    (can, FDCAN) => { impl_fdcan!(FDCAN, FDCANRAM); };
    (can, FDCAN1) => { impl_fdcan!(FDCAN1, FDCANRAM1); };
    (can, FDCAN2) => { impl_fdcan!(FDCAN2, FDCANRAM2); };
    (can, FDCAN3) => { impl_fdcan!(FDCAN3, FDCANRAM3); };
);

#[cfg(stm32h7)]
foreach_peripheral!(
    (can, FDCAN1) => { impl_fdcan!(FDCAN1, FDCANRAM, 0x0000); };
    (can, FDCAN2) => { impl_fdcan!(FDCAN2, FDCANRAM, 0x0C00); };
    (can, FDCAN3) => { impl_fdcan!(FDCAN3, FDCANRAM, 0x1800); };
);

pin_trait!(RxPin, Instance);
pin_trait!(TxPin, Instance);