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Get DMA on H7 working, add usart_dma example for H7.

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This commit is contained in:
Bob McWhirter
2021-07-16 14:40:25 -04:00
parent 1254e99be1
commit 0119ea809d
4 changed files with 115 additions and 45 deletions
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13
embassy-stm32/src/dma/dma.rs
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@ -3,7 +3,7 @@ use core::task::Poll;
use atomic_polyfill::{AtomicU8, Ordering};
use core::future::Future;
use embassy::interrupt::{Interrupt, InterruptExt};
use embassy::util::AtomicWaker;
use embassy::util::{AtomicWaker, OnDrop};
use futures::future::poll_fn;
use crate::interrupt;
@ -38,6 +38,7 @@ 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(
dma: pac::dma::Dma,
channel_number: u8,
@ -59,6 +60,15 @@ pub(crate) async unsafe fn do_transfer(
let ch = dma.st(channel_number as _);
let on_drop = OnDrop::new(|| unsafe {
ch.cr().modify(|w| {
w.set_tcie(false);
w.set_teie(false);
w.set_en(false);
});
while ch.cr().read().en() {}
});
#[cfg(dmamux)]
super::dmamux::configure_dmamux(dmamux_regs, dmamux_ch_num, request);
@ -74,6 +84,7 @@ pub(crate) async unsafe fn do_transfer(
w.set_pinc(vals::Inc::FIXED);
w.set_teie(true);
w.set_tcie(true);
w.set_trbuff(true);
w.set_en(true);
#[cfg(dma_v2)]