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The async move portion of @thalesfragoso's i2c PR.

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This commit is contained in:
Bob McWhirter
2021-07-20 11:38:16 -04:00
parent 25b870d811
commit 2d3137afc7
2 changed files with 34 additions and 28 deletions
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33
embassy-stm32/src/dma/dma.rs
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@ -1,7 +1,7 @@
use core::future::Future;
use core::task::Poll;
use atomic_polyfill::{AtomicU8, Ordering};
use core::future::Future;
use embassy::interrupt::{Interrupt, InterruptExt};
use embassy::util::{AtomicWaker, OnDrop};
use futures::future::poll_fn;
@ -39,7 +39,7 @@ static STATE: State = State::new();
//async unsafe fn do_transfer(ch: &mut impl Channel, ch_func: u8, src: *const u8, dst: &mut [u8]) {
#[allow(unused)]
pub(crate) async unsafe fn do_transfer(
pub(crate) unsafe fn do_transfer(
dma: pac::dma::Dma,
channel_number: u8,
state_number: u8,
@ -50,7 +50,7 @@ pub(crate) async unsafe fn do_transfer(
mem_len: usize,
#[cfg(dmamux)] dmamux_regs: pac::dmamux::Dmamux,
#[cfg(dmamux)] dmamux_ch_num: u8,
) {
) -> impl Future<Output = ()> {
// ndtr is max 16 bits.
assert!(mem_len <= 0xFFFF);
@ -60,7 +60,7 @@ pub(crate) async unsafe fn do_transfer(
let ch = dma.st(channel_number as _);
let on_drop = OnDrop::new(|| unsafe {
let on_drop = OnDrop::new(move || unsafe {
ch.cr().modify(|w| {
w.set_tcie(false);
w.set_teie(false);
@ -100,18 +100,21 @@ pub(crate) async unsafe fn do_transfer(
});
}
let res = poll_fn(|cx| {
let n = channel_number as usize;
STATE.ch_wakers[n].register(cx.waker());
match STATE.ch_status[n].load(Ordering::Acquire) {
CH_STATUS_NONE => Poll::Pending,
x => Poll::Ready(x),
}
})
.await;
async move {
let res = poll_fn(|cx| {
let n = channel_number as usize;
STATE.ch_wakers[n].register(cx.waker());
match STATE.ch_status[n].load(Ordering::Acquire) {
CH_STATUS_NONE => Poll::Pending,
x => Poll::Ready(x),
}
})
.await;
// TODO handle error
assert!(res == CH_STATUS_COMPLETED);
// TODO handle error
assert!(res == CH_STATUS_COMPLETED);
drop(on_drop)
}
}
macro_rules! dma_num {