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Implement giant (chunked) DMA transfers for DCMI.

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This commit is contained in:
Matous Hybl
2022-04-12 14:06:53 +02:00
parent a1746f4dda
commit 945fa0871f
5 changed files with 333 additions and 13 deletions
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27
embassy-stm32/src/dma/bdma.rs
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@ -76,7 +76,6 @@ foreach_dma_channel! {
);
}
unsafe fn start_write_repeated<W: Word>(&mut self, _request: Request, repeated: W, count: usize, reg_addr: *mut W, options: TransferOptions) {
let buf = [repeated];
low_level_api::start_transfer(
@ -119,6 +118,30 @@ foreach_dma_channel! {
);
}
unsafe fn start_double_buffered_read<W: super::Word>(
&mut self,
_request: Request,
_reg_addr: *const W,
_buffer0: *mut W,
_buffer1: *mut W,
_buffer_len: usize,
_options: TransferOptions,
) {
panic!("Unsafe double buffered mode is unavailable on BDMA");
}
unsafe fn set_buffer0<W: super::Word>(&mut self, _buffer: *mut W) {
panic!("Unsafe double buffered mode is unavailable on BDMA");
}
unsafe fn set_buffer1<W: super::Word>(&mut self, _buffer: *mut W) {
panic!("Unsafe double buffered mode is unavailable on BDMA");
}
unsafe fn is_buffer0_accessible(&mut self) -> bool {
panic!("Unsafe double buffered mode is unavailable on BDMA");
}
fn request_stop(&mut self){
unsafe {low_level_api::request_stop(pac::$dma_peri, $channel_num);}
}
@ -232,7 +255,7 @@ mod low_level_api {
// get a handle on the channel itself
let ch = dma.ch(ch as _);
// read the remaining transfer count. If this is zero, the transfer completed fully.
ch.ndtr().read().ndt()
ch.ndtr().read().ndt() as u16
}
/// Sets the waker for the specified DMA channel