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Add a non-minc write() to DMA which takes a count.

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Use it from "read-only" SPI.
This commit is contained in:
Bob McWhirter
2021-07-20 15:20:16 -04:00
parent 7bbad4c4e5
commit 4c5a234a3a
5 changed files with 117 additions and 9 deletions
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29
embassy-stm32/src/dma/dma.rs
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@ -48,6 +48,7 @@ pub(crate) unsafe fn do_transfer(
peri_addr: *const u8,
mem_addr: *mut u8,
mem_len: usize,
incr_mem: bool,
#[cfg(dmamux)] dmamux_regs: pac::dmamux::Dmamux,
#[cfg(dmamux)] dmamux_ch_num: u8,
) -> impl Future<Output = ()> {
@ -187,6 +188,7 @@ pac::dma_channels! {
src,
buf.as_mut_ptr(),
buf.len(),
true,
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_REGS,
#[cfg(dmamux)]
@ -211,6 +213,33 @@ pac::dma_channels! {
dst,
buf.as_ptr() as *mut u8,
buf.len(),
true,
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_REGS,
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_CH_NUM,
)
}
}
fn write_x<'a>(
&'a mut self,
request: Request,
word: &u8,
num: usize,
dst: *mut u8,
) -> Self::WriteFuture<'a> {
unsafe {
do_transfer(
crate::pac::$dma_peri,
$channel_num,
(dma_num!($dma_peri) * 8) + $channel_num,
request,
vals::Dir::MEMORYTOPERIPHERAL,
dst,
word as *const u8 as *mut u8,
num,
false,
#[cfg(dmamux)]
<Self as super::dmamux::sealed::MuxChannel>::DMAMUX_REGS,
#[cfg(dmamux)]