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Merge pull request #265 from thalesfragoso/some-fences

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stm32: Adjust some fences around DMA
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Thales 2021-06-30 19:08:17 -03:00 committed by GitHub
commit 334c3a44a4
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2 changed files with 9 additions and 10 deletions
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17
embassy-stm32/src/dma/v2.rs
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@ -1,5 +1,6 @@
use core::sync::atomic::{AtomicU8, Ordering};
use core::task::Poll;
use atomic_polyfill::{AtomicU8, Ordering};
use embassy::interrupt::{Interrupt, InterruptExt};
use embassy::util::AtomicWaker;
use futures::future::poll_fn;
@ -53,7 +54,8 @@ pub(crate) async unsafe fn transfer_p2m(
assert!(dst.len() <= 0xFFFF);
// Reset status
STATE.ch_status[n].store(CH_STATUS_NONE, Ordering::Relaxed);
// Generate a DMB here to flush the store buffer (M7) before enabling the DMA
STATE.ch_status[n].store(CH_STATUS_NONE, Ordering::Release);
unsafe {
c.par().write_value(src as _);
@ -99,13 +101,13 @@ pub(crate) async unsafe fn transfer_m2p(
assert!(src.len() <= 0xFFFF);
// Reset status
STATE.ch_status[n].store(CH_STATUS_NONE, Ordering::Relaxed);
// Generate a DMB here to flush the store buffer (M7) before enabling the DMA
STATE.ch_status[n].store(CH_STATUS_NONE, Ordering::Release);
unsafe {
c.par().write_value(dst as _);
c.m0ar().write_value(src.as_ptr() as _);
c.ndtr().write_value(regs::Ndtr(src.len() as _));
compiler_fence(Ordering::AcqRel);
c.cr().write(|w| {
w.set_dir(vals::Dir::MEMORYTOPERIPHERAL);
w.set_msize(vals::Size::BITS8);
@ -131,8 +133,6 @@ pub(crate) async unsafe fn transfer_m2p(
})
.await;
compiler_fence(Ordering::AcqRel);
// TODO handle error
assert!(res == CH_STATUS_COMPLETED);
}
@ -148,10 +148,10 @@ unsafe fn on_irq() {
for chn in 0..4 {
let n = dman * 8 + isrn * 4 + chn;
if isr.teif(chn) {
STATE.ch_status[n].store(CH_STATUS_ERROR, Ordering::Release);
STATE.ch_status[n].store(CH_STATUS_ERROR, Ordering::Relaxed);
STATE.ch_wakers[n].wake();
} else if isr.tcif(chn) {
STATE.ch_status[n].store(CH_STATUS_COMPLETED, Ordering::Release);
STATE.ch_status[n].store(CH_STATUS_COMPLETED, Ordering::Relaxed);
STATE.ch_wakers[n].wake();
}
}
@ -301,7 +301,6 @@ pub struct M2P;
#[cfg(usart)]
use crate::usart;
use atomic_polyfill::compiler_fence;
peripheral_dma_channels! {
($peri:ident, usart, $kind:ident, RX, $channel_peri:ident, $dma_peri:ident, $channel_num:expr, $event_num:expr) => {
impl usart::RxDma<peripherals::$peri> for peripherals::$channel_peri { }

2
stm32-data

@ -1 +1 @@
Subproject commit 9856b11172ae27ffa60d339ac271d2d06c190756
Subproject commit f0a6585b4806b1f7c6836126d063eaaf970cc5a4