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stm32/uart: refactor rx ringbuffer

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- remove some race conditions
- allow full use of rx buffer
This commit is contained in:
xoviat
2023-05-29 14:49:43 -05:00
parent 0a136c308e
commit aba0f8fd6c
7 changed files with 422 additions and 424 deletions
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50
embassy-stm32/src/usart/mod.rs
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@ -13,6 +13,12 @@ use futures::future::{select, Either};
use crate::dma::{NoDma, Transfer};
use crate::gpio::sealed::AFType;
#[cfg(not(any(usart_v1, usart_v2)))]
#[allow(unused_imports)]
use crate::pac::usart::regs::Isr as Sr;
#[cfg(any(usart_v1, usart_v2))]
#[allow(unused_imports)]
use crate::pac::usart::regs::Sr;
#[cfg(not(any(usart_v1, usart_v2)))]
use crate::pac::usart::Lpuart as Regs;
#[cfg(any(usart_v1, usart_v2))]
use crate::pac::usart::Usart as Regs;
@ -32,7 +38,6 @@ impl<T: BasicInstance> interrupt::Handler<T::Interrupt> for InterruptHandler<T>
let (sr, cr1, cr3) = unsafe { (sr(r).read(), r.cr1().read(), r.cr3().read()) };
let mut wake = false;
let has_errors = (sr.pe() && cr1.peie()) || ((sr.fe() || sr.ne() || sr.ore()) && cr3.eie());
if has_errors {
// clear all interrupts and DMA Rx Request
@ -52,35 +57,24 @@ impl<T: BasicInstance> interrupt::Handler<T::Interrupt> for InterruptHandler<T>
w.set_dmar(false);
});
}
} else if cr1.idleie() && sr.idle() {
// IDLE detected: no more data will come
unsafe {
r.cr1().modify(|w| {
// disable idle line detection
w.set_idleie(false);
});
}
} else if cr1.rxneie() {
// We cannot check the RXNE flag as it is auto-cleared by the DMA controller
wake = true;
// It is up to the listener to determine if this in fact was a RX event and disable the RXNE detection
} else {
if cr1.idleie() && sr.idle() {
// IDLE detected: no more data will come
unsafe {
r.cr1().modify(|w| {
// disable idle line detection
w.set_idleie(false);
});
}
wake = true;
}
if cr1.rxneie() {
// We cannot check the RXNE flag as it is auto-cleared by the DMA controller
// It is up to the listener to determine if this in fact was a RX event and disable the RXNE detection
wake = true;
}
return;
}
if wake {
compiler_fence(Ordering::SeqCst);
s.rx_waker.wake();
}
compiler_fence(Ordering::SeqCst);
s.rx_waker.wake();
}
}
@ -1109,9 +1103,9 @@ pub use crate::usart::buffered::InterruptHandler as BufferedInterruptHandler;
mod buffered;
#[cfg(not(gpdma))]
mod rx_ringbuffered;
mod ringbuffered;
#[cfg(not(gpdma))]
pub use rx_ringbuffered::RingBufferedUartRx;
pub use ringbuffered::RingBufferedUartRx;
use self::sealed::Kind;