stm32/sai: fix build on chips with only SAI4 (like stm32h725re), improve sync config.

STM32 I2C: expose async API without needing "time" feature.

ci.sh

@@ -110,6 +110,7 @@ cargo batch  \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32h753zi,defmt,exti,time-driver-any,unstable-traits,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32h735zg,defmt,exti,time-driver-any,unstable-traits,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32h755zi-cm7,defmt,exti,time-driver-any,unstable-traits,time \
+    --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32h725re,defmt,exti,time-driver-any,unstable-traits,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32h7b3ai,defmt,exti,time-driver-any,unstable-traits,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32l476vg,defmt,exti,time-driver-any,unstable-traits,time \
     --- build --release --manifest-path embassy-stm32/Cargo.toml --target thumbv7em-none-eabi --features nightly,stm32l422cb,defmt,exti,time-driver-any,unstable-traits,time \

cyw43/src/control.rs

@@ -1,4 +1,5 @@
 use core::cmp::{max, min};
+use core::iter::zip;
 
 use embassy_net_driver_channel as ch;
 use embassy_net_driver_channel::driver::{HardwareAddress, LinkState};
@@ -16,6 +17,12 @@ pub struct Error {
     pub status: u32,
 }
 
+#[derive(Debug)]
+pub enum AddMulticastAddressError {
+    NotMulticast,
+    NoFreeSlots,
+}
+
 pub struct Control<'a> {
     state_ch: ch::StateRunner<'a>,
     events: &'a Events,
@@ -316,6 +323,54 @@ impl<'a> Control<'a> {
         self.set_iovar_u32x2("bss", 0, 1).await; // bss = BSS_UP
     }
 
+    /// Add specified address to the list of hardware addresses the device
+    /// listens on. The address must be a Group address (I/G bit set). Up
+    /// to 10 addresses are supported by the firmware. Returns the number of
+    /// address slots filled after adding, or an error.
+    pub async fn add_multicast_address(&mut self, address: [u8; 6]) -> Result<usize, AddMulticastAddressError> {
+        // The firmware seems to ignore non-multicast addresses, so let's
+        // prevent the user from adding them and wasting space.
+        if address[0] & 0x01 != 1 {
+            return Err(AddMulticastAddressError::NotMulticast);
+        }
+
+        let mut buf = [0; 64];
+        self.get_iovar("mcast_list", &mut buf).await;
+
+        let n = u32::from_le_bytes(buf[..4].try_into().unwrap()) as usize;
+        let (used, free) = buf[4..].split_at_mut(n * 6);
+
+        if used.chunks(6).any(|a| a == address) {
+            return Ok(n);
+        }
+
+        if free.len() < 6 {
+            return Err(AddMulticastAddressError::NoFreeSlots);
+        }
+
+        free[..6].copy_from_slice(&address);
+        let n = n + 1;
+        buf[..4].copy_from_slice(&(n as u32).to_le_bytes());
+
+        self.set_iovar_v::<80>("mcast_list", &buf).await;
+        Ok(n)
+    }
+
+    /// Retrieve the list of configured multicast hardware addresses.
+    pub async fn list_mulistcast_addresses(&mut self, result: &mut [[u8; 6]; 10]) -> usize {
+        let mut buf = [0; 64];
+        self.get_iovar("mcast_list", &mut buf).await;
+
+        let n = u32::from_le_bytes(buf[..4].try_into().unwrap()) as usize;
+        let used = &buf[4..][..n * 6];
+
+        for (addr, output) in zip(used.chunks(6), result.iter_mut()) {
+            output.copy_from_slice(addr)
+        }
+
+        n
+    }
+
     async fn set_iovar_u32x2(&mut self, name: &str, val1: u32, val2: u32) {
         let mut buf = [0; 8];
         buf[0..4].copy_from_slice(&val1.to_le_bytes());

cyw43/src/lib.rs

@@ -27,7 +27,7 @@ use ioctl::IoctlState;
 
 use crate::bus::Bus;
 pub use crate::bus::SpiBusCyw43;
-pub use crate::control::{Control, Error as ControlError, Scanner};
+pub use crate::control::{AddMulticastAddressError, Control, Error as ControlError, Scanner};
 pub use crate::runner::Runner;
 pub use crate::structs::BssInfo;
 

embassy-executor/src/raw/mod.rs

@@ -11,7 +11,8 @@
 #[cfg_attr(not(target_has_atomic = "ptr"), path = "run_queue_critical_section.rs")]
 mod run_queue;
 
-#[cfg_attr(target_has_atomic = "8", path = "state_atomics.rs")]
+#[cfg_attr(all(cortex_m, target_has_atomic = "8"), path = "state_atomics_arm.rs")]
+#[cfg_attr(all(not(cortex_m), target_has_atomic = "8"), path = "state_atomics.rs")]
 #[cfg_attr(not(target_has_atomic = "8"), path = "state_critical_section.rs")]
 mod state;
 

embassy-executor/src/raw/state_atomics_arm.rs

@@ -0,0 +1,103 @@
+use core::arch::asm;
+use core::sync::atomic::{compiler_fence, AtomicBool, AtomicU32, Ordering};
+
+// Must be kept in sync with the layout of `State`!
+pub(crate) const STATE_SPAWNED: u32 = 1 << 0;
+pub(crate) const STATE_RUN_QUEUED: u32 = 1 << 8;
+
+#[repr(C, align(4))]
+pub(crate) struct State {
+    /// Task is spawned (has a future)
+    spawned: AtomicBool,
+    /// Task is in the executor run queue
+    run_queued: AtomicBool,
+    /// Task is in the executor timer queue
+    timer_queued: AtomicBool,
+    pad: AtomicBool,
+}
+
+impl State {
+    pub const fn new() -> State {
+        Self {
+            spawned: AtomicBool::new(false),
+            run_queued: AtomicBool::new(false),
+            timer_queued: AtomicBool::new(false),
+            pad: AtomicBool::new(false),
+        }
+    }
+
+    fn as_u32(&self) -> &AtomicU32 {
+        unsafe { &*(self as *const _ as *const AtomicU32) }
+    }
+
+    /// If task is idle, mark it as spawned + run_queued and return true.
+    #[inline(always)]
+    pub fn spawn(&self) -> bool {
+        compiler_fence(Ordering::Release);
+        let r = self
+            .as_u32()
+            .compare_exchange(
+                0,
+                STATE_SPAWNED | STATE_RUN_QUEUED,
+                Ordering::Relaxed,
+                Ordering::Relaxed,
+            )
+            .is_ok();
+        compiler_fence(Ordering::Acquire);
+        r
+    }
+
+    /// Unmark the task as spawned.
+    #[inline(always)]
+    pub fn despawn(&self) {
+        compiler_fence(Ordering::Release);
+        self.spawned.store(false, Ordering::Relaxed);
+    }
+
+    /// Mark the task as run-queued if it's spawned and isn't already run-queued. Return true on success.
+    #[inline(always)]
+    pub fn run_enqueue(&self) -> bool {
+        unsafe {
+            loop {
+                let state: u32;
+                asm!("ldrex {}, [{}]", out(reg) state, in(reg) self, options(nostack));
+
+                if (state & STATE_RUN_QUEUED != 0) || (state & STATE_SPAWNED == 0) {
+                    asm!("clrex", options(nomem, nostack));
+                    return false;
+                }
+
+                let outcome: usize;
+                let new_state = state | STATE_RUN_QUEUED;
+                asm!("strex {}, {}, [{}]", out(reg) outcome, in(reg) new_state, in(reg) self, options(nostack));
+                if outcome == 0 {
+                    return true;
+                }
+            }
+        }
+    }
+
+    /// Unmark the task as run-queued. Return whether the task is spawned.
+    #[inline(always)]
+    pub fn run_dequeue(&self) -> bool {
+        compiler_fence(Ordering::Release);
+
+        let r = self.spawned.load(Ordering::Relaxed);
+        self.run_queued.store(false, Ordering::Relaxed);
+        r
+    }
+
+    /// Mark the task as timer-queued. Return whether it was newly queued (i.e. not queued before)
+    #[cfg(feature = "integrated-timers")]
+    #[inline(always)]
+    pub fn timer_enqueue(&self) -> bool {
+        !self.timer_queued.swap(true, Ordering::Relaxed)
+    }
+
+    /// Unmark the task as timer-queued.
+    #[cfg(feature = "integrated-timers")]
+    #[inline(always)]
+    pub fn timer_dequeue(&self) {
+        self.timer_queued.store(false, Ordering::Relaxed);
+    }
+}

embassy-stm32/build.rs

@@ -61,6 +61,7 @@ fn main() {
     let mut singletons: Vec<String> = Vec::new();
     for p in METADATA.peripherals {
         if let Some(r) = &p.registers {
+            println!("cargo:rustc-cfg=peri_{}", p.name.to_ascii_lowercase());
             match r.kind {
                 // Generate singletons per pin, not per port
                 "gpio" => {

embassy-stm32/src/i2c/v2.rs

@@ -1,21 +1,16 @@
 use core::cmp;
-#[cfg(feature = "time")]
 use core::future::poll_fn;
 use core::marker::PhantomData;
-#[cfg(feature = "time")]
 use core::task::Poll;
 
 use embassy_embedded_hal::SetConfig;
-#[cfg(feature = "time")]
 use embassy_hal_internal::drop::OnDrop;
 use embassy_hal_internal::{into_ref, PeripheralRef};
 use embassy_sync::waitqueue::AtomicWaker;
 #[cfg(feature = "time")]
 use embassy_time::{Duration, Instant};
 
-use crate::dma::NoDma;
-#[cfg(feature = "time")]
-use crate::dma::Transfer;
+use crate::dma::{NoDma, Transfer};
 use crate::gpio::sealed::AFType;
 use crate::gpio::Pull;
 use crate::i2c::{Error, Instance, SclPin, SdaPin};
@@ -24,6 +19,23 @@ use crate::pac::i2c;
 use crate::time::Hertz;
 use crate::{interrupt, Peripheral};
 
+#[cfg(feature = "time")]
+fn timeout_fn(timeout: Duration) -> impl Fn() -> Result<(), Error> {
+    let deadline = Instant::now() + timeout;
+    move || {
+        if Instant::now() > deadline {
+            Err(Error::Timeout)
+        } else {
+            Ok(())
+        }
+    }
+}
+
+#[cfg(not(feature = "time"))]
+pub fn no_timeout_fn() -> impl Fn() -> Result<(), Error> {
+    move || Ok(())
+}
+
 /// Interrupt handler.
 pub struct InterruptHandler<T: Instance> {
     _phantom: PhantomData<T>,
@@ -260,21 +272,12 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
     }
 
     fn flush_txdr(&self) {
-        //if $i2c.isr.read().txis().bit_is_set() {
-        //$i2c.txdr.write(|w| w.txdata().bits(0));
-        //}
-
         if T::regs().isr().read().txis() {
             T::regs().txdr().write(|w| w.set_txdata(0));
         }
         if !T::regs().isr().read().txe() {
             T::regs().isr().modify(|w| w.set_txe(true))
         }
-
-        // If TXDR is not flagged as empty, write 1 to flush it
-        //if $i2c.isr.read().txe().is_not_empty() {
-        //$i2c.isr.write(|w| w.txe().set_bit());
-        //}
     }
 
     fn wait_txe(&self, check_timeout: impl Fn() -> Result<(), Error>) -> Result<(), Error> {
@@ -437,7 +440,6 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         result
     }
 
-    #[cfg(feature = "time")]
     async fn write_dma_internal(
         &mut self,
         address: u8,
@@ -528,7 +530,6 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         Ok(())
     }
 
-    #[cfg(feature = "time")]
     async fn read_dma_internal(
         &mut self,
         address: u8,
@@ -610,42 +611,38 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
 
     // =========================
     //  Async public API
-
     #[cfg(feature = "time")]
     pub async fn write(&mut self, address: u8, write: &[u8]) -> Result<(), Error>
-    where
-        TXDMA: crate::i2c::TxDma<T>,
-    {
-        self.write_timeout(address, write, self.timeout).await
-    }
-
-    #[cfg(feature = "time")]
-    pub async fn write_timeout(&mut self, address: u8, write: &[u8], timeout: Duration) -> Result<(), Error>
     where
         TXDMA: crate::i2c::TxDma<T>,
     {
         if write.is_empty() {
-            self.write_internal(address, write, true, timeout_fn(timeout))
+            self.write_internal(address, write, true, timeout_fn(self.timeout))
         } else {
             embassy_time::with_timeout(
-                timeout,
-                self.write_dma_internal(address, write, true, true, timeout_fn(timeout)),
+                self.timeout,
+                self.write_dma_internal(address, write, true, true, timeout_fn(self.timeout)),
             )
             .await
             .unwrap_or(Err(Error::Timeout))
         }
     }
 
-    #[cfg(feature = "time")]
-    pub async fn write_vectored(&mut self, address: u8, write: &[&[u8]]) -> Result<(), Error>
+    #[cfg(not(feature = "time"))]
+    pub async fn write(&mut self, address: u8, write: &[u8]) -> Result<(), Error>
     where
         TXDMA: crate::i2c::TxDma<T>,
     {
-        self.write_vectored_timeout(address, write, self.timeout).await
+        if write.is_empty() {
+            self.write_internal(address, write, true, no_timeout_fn())
+        } else {
+            self.write_dma_internal(address, write, true, true, no_timeout_fn())
+                .await
+        }
     }
 
     #[cfg(feature = "time")]
-    pub async fn write_vectored_timeout(&mut self, address: u8, write: &[&[u8]], timeout: Duration) -> Result<(), Error>
+    pub async fn write_vectored(&mut self, address: u8, write: &[&[u8]]) -> Result<(), Error>
     where
         TXDMA: crate::i2c::TxDma<T>,
     {
@@ -661,8 +658,8 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
             let is_last = next.is_none();
 
             embassy_time::with_timeout(
-                timeout,
-                self.write_dma_internal(address, c, first, is_last, timeout_fn(timeout)),
+                self.timeout,
+                self.write_dma_internal(address, c, first, is_last, timeout_fn(self.timeout)),
             )
             .await
             .unwrap_or(Err(Error::Timeout))?;
@@ -672,66 +669,79 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         Ok(())
     }
 
+    #[cfg(not(feature = "time"))]
+    pub async fn write_vectored(&mut self, address: u8, write: &[&[u8]]) -> Result<(), Error>
+    where
+        TXDMA: crate::i2c::TxDma<T>,
+    {
+        if write.is_empty() {
+            return Err(Error::ZeroLengthTransfer);
+        }
+        let mut iter = write.iter();
+
+        let mut first = true;
+        let mut current = iter.next();
+        while let Some(c) = current {
+            let next = iter.next();
+            let is_last = next.is_none();
+
+            self.write_dma_internal(address, c, first, is_last, no_timeout_fn())
+                .await?;
+            first = false;
+            current = next;
+        }
+        Ok(())
+    }
+
     #[cfg(feature = "time")]
     pub async fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Error>
     where
         RXDMA: crate::i2c::RxDma<T>,
     {
-        self.read_timeout(address, buffer, self.timeout).await
+        if buffer.is_empty() {
+            self.read_internal(address, buffer, false, timeout_fn(self.timeout))
+        } else {
+            embassy_time::with_timeout(
+                self.timeout,
+                self.read_dma_internal(address, buffer, false, timeout_fn(self.timeout)),
+            )
+            .await
+            .unwrap_or(Err(Error::Timeout))
+        }
     }
 
-    #[cfg(feature = "time")]
-    pub async fn read_timeout(&mut self, address: u8, buffer: &mut [u8], timeout: Duration) -> Result<(), Error>
+    #[cfg(not(feature = "time"))]
+    pub async fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Error>
     where
         RXDMA: crate::i2c::RxDma<T>,
     {
         if buffer.is_empty() {
-            self.read_internal(address, buffer, false, timeout_fn(timeout))
+            self.read_internal(address, buffer, false, no_timeout_fn())
         } else {
-            embassy_time::with_timeout(
-                timeout,
-                self.read_dma_internal(address, buffer, false, timeout_fn(timeout)),
-            )
-            .await
-            .unwrap_or(Err(Error::Timeout))
+            self.read_dma_internal(address, buffer, false, no_timeout_fn()).await
         }
     }
 
     #[cfg(feature = "time")]
     pub async fn write_read(&mut self, address: u8, write: &[u8], read: &mut [u8]) -> Result<(), Error>
-    where
-        TXDMA: super::TxDma<T>,
-        RXDMA: super::RxDma<T>,
-    {
-        self.write_read_timeout(address, write, read, self.timeout).await
-    }
-
-    #[cfg(feature = "time")]
-    pub async fn write_read_timeout(
-        &mut self,
-        address: u8,
-        write: &[u8],
-        read: &mut [u8],
-        timeout: Duration,
-    ) -> Result<(), Error>
     where
         TXDMA: super::TxDma<T>,
         RXDMA: super::RxDma<T>,
     {
         let start_instant = Instant::now();
-        let check_timeout = timeout_fn(timeout);
+        let check_timeout = timeout_fn(self.timeout);
         if write.is_empty() {
             self.write_internal(address, write, false, &check_timeout)?;
         } else {
             embassy_time::with_timeout(
-                timeout,
+                self.timeout,
                 self.write_dma_internal(address, write, true, true, &check_timeout),
             )
             .await
             .unwrap_or(Err(Error::Timeout))?;
         }
 
-        let time_left_until_timeout = timeout - Instant::now().duration_since(start_instant);
+        let time_left_until_timeout = self.timeout - Instant::now().duration_since(start_instant);
 
         if read.is_empty() {
             self.read_internal(address, read, true, &check_timeout)?;
@@ -747,6 +757,28 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         Ok(())
     }
 
+    #[cfg(not(feature = "time"))]
+    pub async fn write_read(&mut self, address: u8, write: &[u8], read: &mut [u8]) -> Result<(), Error>
+    where
+        TXDMA: super::TxDma<T>,
+        RXDMA: super::RxDma<T>,
+    {
+        let no_timeout = no_timeout_fn();
+        if write.is_empty() {
+            self.write_internal(address, write, false, &no_timeout)?;
+        } else {
+            self.write_dma_internal(address, write, true, true, &no_timeout).await?;
+        }
+
+        if read.is_empty() {
+            self.read_internal(address, read, true, &no_timeout)?;
+        } else {
+            self.read_dma_internal(address, read, true, &no_timeout).await?;
+        }
+
+        Ok(())
+    }
+
     // =========================
     //  Blocking public API
 
@@ -1201,15 +1233,3 @@ impl<'d, T: Instance> SetConfig for I2c<'d, T> {
         Ok(())
     }
 }
-
-#[cfg(feature = "time")]
-fn timeout_fn(timeout: Duration) -> impl Fn() -> Result<(), Error> {
-    let deadline = Instant::now() + timeout;
-    move || {
-        if Instant::now() > deadline {
-            Err(Error::Timeout)
-        } else {
-            Ok(())
-        }
-    }
-}

embassy-stm32/src/sai/mod.rs

@@ -207,27 +207,40 @@ impl Protocol {
 }
 
 #[derive(Copy, Clone, PartialEq)]
-pub enum SyncEnable {
-    Asynchronous,
+pub enum SyncInput {
+    /// Not synced to any other SAI unit.
+    None,
     /// Syncs with the other A/B sub-block within the SAI unit
     Internal,
-    /// Syncs with a sub-block in the other SAI unit - use set_sync_output() and set_sync_input()
-    #[cfg(any(sai_v4))]
-    External,
+    /// Syncs with a sub-block in the other SAI unit
+    #[cfg(sai_v4)]
+    External(SyncInputInstance),
 }
 
-impl SyncEnable {
-    #[cfg(any(sai_v1, sai_v2, sai_v3, sai_v4))]
+impl SyncInput {
     pub const fn syncen(&self) -> vals::Syncen {
         match self {
-            SyncEnable::Asynchronous => vals::Syncen::ASYNCHRONOUS,
-            SyncEnable::Internal => vals::Syncen::INTERNAL,
+            SyncInput::None => vals::Syncen::ASYNCHRONOUS,
+            SyncInput::Internal => vals::Syncen::INTERNAL,
             #[cfg(any(sai_v4))]
-            SyncEnable::External => vals::Syncen::EXTERNAL,
+            SyncInput::External(_) => vals::Syncen::EXTERNAL,
         }
     }
 }
 
+#[cfg(sai_v4)]
+#[derive(Copy, Clone, PartialEq)]
+pub enum SyncInputInstance {
+    #[cfg(peri_sai1)]
+    Sai1 = 0,
+    #[cfg(peri_sai2)]
+    Sai2 = 1,
+    #[cfg(peri_sai3)]
+    Sai3 = 2,
+    #[cfg(peri_sai4)]
+    Sai4 = 3,
+}
+
 #[derive(Copy, Clone, PartialEq)]
 pub enum StereoMono {
     Stereo,
@@ -428,8 +441,8 @@ impl MasterClockDivider {
 pub struct Config {
     pub mode: Mode,
     pub tx_rx: TxRx,
-    pub sync_enable: SyncEnable,
-    pub is_sync_output: bool,
+    pub sync_input: SyncInput,
+    pub sync_output: bool,
     pub protocol: Protocol,
     pub slot_size: SlotSize,
     pub slot_count: word::U4,
@@ -459,8 +472,8 @@ impl Default for Config {
         Self {
             mode: Mode::Master,
             tx_rx: TxRx::Transmitter,
-            is_sync_output: false,
-            sync_enable: SyncEnable::Asynchronous,
+            sync_output: false,
+            sync_input: SyncInput::None,
             protocol: Protocol::Free,
             slot_size: SlotSize::DataSize,
             slot_count: word::U4(2),
@@ -608,18 +621,18 @@ impl<'d, T: Instance> Sai<'d, T> {
 
 fn update_synchronous_config(config: &mut Config) {
     config.mode = Mode::Slave;
-    config.is_sync_output = false;
+    config.sync_output = false;
 
     #[cfg(any(sai_v1, sai_v2, sai_v3))]
     {
-        config.sync_enable = SyncEnable::Internal;
+        config.sync_input = SyncInput::Internal;
     }
 
     #[cfg(any(sai_v4))]
     {
         //this must either be Internal or External
-        //The asynchronous sub-block on the same SAI needs to enable is_sync_output
-        assert!(config.sync_enable != SyncEnable::Asynchronous);
+        //The asynchronous sub-block on the same SAI needs to enable sync_output
+        assert!(config.sync_input != SyncInput::None);
     }
 }
 
@@ -866,20 +879,13 @@ impl<'d, T: Instance, C: Channel, W: word::Word> SubBlock<'d, T, C, W> {
 
         #[cfg(any(sai_v4))]
         {
-            // Not totally clear from the datasheet if this is right
-            // This is only used if using SyncEnable::External on the other SAI unit
-            // Syncing from SAIX subblock A to subblock B does not require this
-            // Only syncing from SAI1 subblock A/B to SAI2 subblock A/B
-            let value: u8 = if T::REGS.as_ptr() == stm32_metapac::SAI1.as_ptr() {
-                1 //this is SAI1, so sync with SAI2
-            } else {
-                0 //this is SAI2, so sync with SAI1
-            };
-            T::REGS.gcr().modify(|w| {
-                w.set_syncin(value);
-            });
+            if let SyncInput::External(i) = config.sync_input {
+                T::REGS.gcr().modify(|w| {
+                    w.set_syncin(i as u8);
+                });
+            }
 
-            if config.is_sync_output {
+            if config.sync_output {
                 let syncout: u8 = match sub_block {
                     WhichSubBlock::A => 0b01,
                     WhichSubBlock::B => 0b10,
@@ -903,7 +909,7 @@ impl<'d, T: Instance, C: Channel, W: word::Word> SubBlock<'d, T, C, W> {
                 w.set_ds(config.data_size.ds());
                 w.set_lsbfirst(config.bit_order.lsbfirst());
                 w.set_ckstr(config.clock_strobe.ckstr());
-                w.set_syncen(config.sync_enable.syncen());
+                w.set_syncen(config.sync_input.syncen());
                 w.set_mono(config.stereo_mono.mono());
                 w.set_outdriv(config.output_drive.outdriv());
                 w.set_mckdiv(config.master_clock_divider.mckdiv());