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uarte: Only stop RX forcefully when a reception is running

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The STOPRX task always triggers a timeout of ~55bit times until the
RXTO event is generated. Before we disabled the receiver only after
the timeout.
With this change the receiver is stopped right after reception has ended
because the DMA buffer is full.
For forced RX aborts like `stop()` or on drop still need to wait for the
RXTO event before disabling the receiver.
This commit is contained in:
Timo Kröger 2021-01-03 11:12:11 +01:00
parent 9f28c7ab8d
commit a7c03e4cb6
1 changed files with 26 additions and 17 deletions
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43
embassy-nrf/src/uarte.rs
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@ -170,6 +170,13 @@ where
trace!("endrx");
let len = uarte.rxd.amount.read().bits();
compiler_fence(Ordering::SeqCst);
if uarte.events_rxstarted.read().bits() != 0 {
// The ENDRX was signal triggered because DMA buffer is full.
uarte.events_rxstarted.reset();
try_disable = true;
}
T::state().rx_done.signal(len);
}
@ -227,6 +234,7 @@ impl<T: Instance> embassy::uart::Uart for Uarte<T> {
// `mem::forget()` on a previous future after polling it once.
assert!(!self.rx_started());
T::state().rx_done.reset();
self.enable();
ReceiveFuture {
@ -334,27 +342,28 @@ where
fn poll(self: core::pin::Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let Self { uarte, buf } = unsafe { self.get_unchecked_mut() };
if !uarte.rx_started() {
let uarte = &uarte.instance;
match T::state().rx_done.poll_wait(cx) {
Poll::Pending if !uarte.rx_started() => {
let uarte = &uarte.instance;
T::state().rx_done.reset();
let ptr = buf.as_ptr();
let len = buf.len();
assert!(len <= EASY_DMA_SIZE);
let ptr = buf.as_ptr();
let len = buf.len();
assert!(len <= EASY_DMA_SIZE);
compiler_fence(Ordering::SeqCst);
uarte.rxd.ptr.write(|w| unsafe { w.ptr().bits(ptr as u32) });
uarte
.rxd
.maxcnt
.write(|w| unsafe { w.maxcnt().bits(len as _) });
compiler_fence(Ordering::SeqCst);
uarte.rxd.ptr.write(|w| unsafe { w.ptr().bits(ptr as u32) });
uarte
.rxd
.maxcnt
.write(|w| unsafe { w.maxcnt().bits(len as _) });
trace!("startrx");
uarte.tasks_startrx.write(|w| unsafe { w.bits(1) });
trace!("startrx");
uarte.tasks_startrx.write(|w| unsafe { w.bits(1) });
Poll::Pending
}
Poll::Pending => Poll::Pending,
Poll::Ready(_) => Poll::Ready(Ok(())),
}
T::state().rx_done.poll_wait(cx).map(|_| Ok(()))
}
}