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stm32/dma: simplify impls a bit.

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This commit is contained in:
Dario Nieuwenhuis 2021-12-08 03:30:07 +01:00
parent b316d2620c
commit 022c4cb739
2 changed files with 36 additions and 39 deletions
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19
embassy-stm32/src/dma/bdma.rs
View File

@ -59,7 +59,7 @@ unsafe fn on_irq() {
let isr = pac::$dma.isr().read();
let dman = dma_num!($dma);
for chn in 0..crate::pac::dma_channels_count!($dma) {
for chn in 0..pac::dma_channels_count!($dma) {
let cr = pac::$dma.ch(chn).cr();
if isr.tcif(chn) && cr.read().tcie() {
cr.write(|_| ()); // Disable channel interrupts with the default value.
@ -90,9 +90,8 @@ pac::dma_channels! {
impl crate::dma::sealed::Channel for crate::peripherals::$channel_peri {
unsafe fn start_write<W: Word>(&mut self, request: Request, buf: &[W], reg_addr: *mut W) {
low_level_api::reset_status(crate::pac::$dma_peri, $channel_num);
low_level_api::start_transfer(
crate::pac::$dma_peri,
pac::$dma_peri,
$channel_num,
#[cfg(any(bdma_v2, dmamux))]
request,
@ -112,9 +111,8 @@ pac::dma_channels! {
unsafe fn start_write_repeated<W: Word>(&mut self, request: Request, repeated: W, count: usize, reg_addr: *mut W) {
let buf = [repeated];
low_level_api::reset_status(crate::pac::$dma_peri, $channel_num);
low_level_api::start_transfer(
crate::pac::$dma_peri,
pac::$dma_peri,
$channel_num,
#[cfg(any(bdma_v2, dmamux))]
request,
@ -132,9 +130,8 @@ pac::dma_channels! {
}
unsafe fn start_read<W: Word>(&mut self, request: Request, reg_addr: *mut W, buf: &mut [W]) {
low_level_api::reset_status(crate::pac::$dma_peri, $channel_num);
low_level_api::start_transfer(
crate::pac::$dma_peri,
pac::$dma_peri,
$channel_num,
#[cfg(any(bdma_v2, dmamux))]
request,
@ -152,14 +149,14 @@ pac::dma_channels! {
}
fn request_stop(&mut self){
unsafe {low_level_api::request_stop(crate::pac::$dma_peri, $channel_num);}
unsafe {low_level_api::request_stop(pac::$dma_peri, $channel_num);}
}
fn is_running(&self) -> bool {
unsafe {low_level_api::is_running(crate::pac::$dma_peri, $channel_num)}
unsafe {low_level_api::is_running(pac::$dma_peri, $channel_num)}
}
fn remaining_transfers(&mut self) -> u16 {
unsafe {low_level_api::get_remaining_transfers(crate::pac::$dma_peri, $channel_num)}
unsafe {low_level_api::get_remaining_transfers(pac::$dma_peri, $channel_num)}
}
fn set_waker(&mut self, waker: &Waker) {
@ -198,6 +195,8 @@ mod low_level_api {
) {
let ch = dma.ch(channel_number as _);
reset_status(dma, channel_number);
#[cfg(dmamux)]
super::super::dmamux::configure_dmamux(dmamux_regs, dmamux_ch_num, request);

56
embassy-stm32/src/dma/dma.rs
View File

@ -85,17 +85,15 @@ pac::dma_channels! {
($channel_peri:ident, $dma_peri:ident, dma, $channel_num:expr, $dmamux:tt) => {
impl crate::dma::sealed::Channel for crate::peripherals::$channel_peri {
unsafe fn start_write<W: Word>(&mut self, request: Request, buf: &[W], reg_addr: *mut W) {
let isrn = $channel_num as usize / 4;
let isrbit = $channel_num as usize % 4;
low_level_api::reset_status(&crate::pac::$dma_peri, isrn, isrbit);
low_level_api::start_transfer(
pac::$dma_peri,
$channel_num,
request,
vals::Dir::MEMORYTOPERIPHERAL,
reg_addr as *const u32,
buf.as_ptr() as *mut u32,
buf.len(),
true,
crate::pac::$dma_peri.st($channel_num as _),
vals::Size::from(W::bits()),
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_REGS,
@ -106,17 +104,15 @@ pac::dma_channels! {
unsafe fn start_write_repeated<W: Word>(&mut self, request: Request, repeated: W, count: usize, reg_addr: *mut W) {
let buf = [repeated];
let isrn = $channel_num as usize / 4;
let isrbit = $channel_num as usize % 4;
low_level_api::reset_status(&crate::pac::$dma_peri, isrn, isrbit);
low_level_api::start_transfer(
pac::$dma_peri,
$channel_num,
request,
vals::Dir::MEMORYTOPERIPHERAL,
reg_addr as *const u32,
buf.as_ptr() as *mut u32,
count,
false,
crate::pac::$dma_peri.st($channel_num as _),
vals::Size::from(W::bits()),
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_REGS,
@ -126,17 +122,15 @@ pac::dma_channels! {
}
unsafe fn start_read<W: Word>(&mut self, request: Request, reg_addr: *mut W, buf: &mut [W]) {
let isrn = $channel_num as usize / 4;
let isrbit = $channel_num as usize % 4;
low_level_api::reset_status(&crate::pac::$dma_peri, isrn, isrbit);
low_level_api::start_transfer(
pac::$dma_peri,
$channel_num,
request,
vals::Dir::PERIPHERALTOMEMORY,
reg_addr as *const u32,
buf.as_ptr() as *mut u32,
buf.len(),
true,
crate::pac::$dma_peri.st($channel_num as _),
vals::Size::from(W::bits()),
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_REGS,
@ -146,15 +140,15 @@ pac::dma_channels! {
}
fn request_stop(&mut self) {
unsafe {low_level_api::request_stop(&crate::pac::$dma_peri, $channel_num);}
unsafe {low_level_api::request_stop(pac::$dma_peri, $channel_num);}
}
fn is_running(&self) -> bool {
unsafe {low_level_api::is_running(&crate::pac::$dma_peri, $channel_num)}
unsafe {low_level_api::is_running(pac::$dma_peri, $channel_num)}
}
fn remaining_transfers(&mut self) -> u16 {
unsafe {low_level_api::get_remaining_transfers(&crate::pac::$dma_peri, $channel_num)}
unsafe {low_level_api::get_remaining_transfers(pac::$dma_peri, $channel_num)}
}
fn set_waker(&mut self, waker: &Waker) {
@ -179,13 +173,14 @@ mod low_level_api {
use super::*;
pub unsafe fn start_transfer(
dma: pac::dma::Dma,
channel_number: u8,
request: Request,
dir: vals::Dir,
peri_addr: *const u32,
mem_addr: *mut u32,
mem_len: usize,
incr_mem: bool,
ch: crate::pac::dma::St,
data_size: vals::Size,
#[cfg(dmamux)] dmamux_regs: pac::dmamux::Dmamux,
#[cfg(dmamux)] dmamux_ch_num: u8,
@ -196,6 +191,9 @@ mod low_level_api {
// "Preceding reads and writes cannot be moved past subsequent writes."
fence(Ordering::SeqCst);
reset_status(dma, channel_number);
let ch = dma.st(channel_number as _);
ch.par().write_value(peri_addr as u32);
ch.m0ar().write_value(mem_addr as u32);
ch.ndtr().write_value(regs::Ndtr(mem_len as _));
@ -223,34 +221,31 @@ mod low_level_api {
}
/// Stops the DMA channel.
pub unsafe fn request_stop(dma: &pac::dma::Dma, channel_number: u8) {
// Reset status
let isrn = channel_number as usize / 4;
let isrbit = channel_number as usize % 4;
reset_status(dma, isrn, isrbit);
pub unsafe fn request_stop(dma: pac::dma::Dma, channel_number: u8) {
// get a handle on the channel itself
let ch = dma.st(channel_number as _);
// Disable the channel and interrupts with the default value.
ch.cr().write(|_| ());
// Disable the channel. Keep the IEs enabled so the irqs still fire.
ch.cr().write(|w| {
w.set_teie(true);
w.set_tcie(true);
});
// "Subsequent reads and writes cannot be moved ahead of preceding reads."
fence(Ordering::SeqCst);
}
/// Gets the running status of the channel
pub unsafe fn is_running(dma: &pac::dma::Dma, ch: u8) -> bool {
pub unsafe fn is_running(dma: pac::dma::Dma, ch: u8) -> bool {
// get a handle on the channel itself
let ch = dma.st(ch as _);
// Wait for the transfer to complete when it was ongoing.
// Get whether it's enabled (running)
ch.cr().read().en()
}
/// Gets the total remaining transfers for the channel
/// Note: this will be zero for transfers that completed without cancellation.
pub unsafe fn get_remaining_transfers(dma: &pac::dma::Dma, ch: u8) -> u16 {
pub unsafe fn get_remaining_transfers(dma: pac::dma::Dma, ch: u8) -> u16 {
// get a handle on the channel itself
let ch = dma.st(ch as _);
// read the remaining transfer count. If this is zero, the transfer completed fully.
@ -262,7 +257,10 @@ mod low_level_api {
STATE.ch_wakers[state_number].register(waker);
}
pub unsafe fn reset_status(dma: &crate::pac::dma::Dma, isrn: usize, isrbit: usize) {
pub unsafe fn reset_status(dma: pac::dma::Dma, channel_number: u8) {
let isrn = channel_number as usize / 4;
let isrbit = channel_number as usize % 4;
dma.ifcr(isrn).write(|w| {
w.set_tcif(isrbit, true);
w.set_teif(isrbit, true);