139 lines
3.5 KiB
Rust
139 lines
3.5 KiB
Rust
#![macro_use]
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use futures::future::join;
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use super::*;
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use crate::dma::{slice_ptr_parts, slice_ptr_parts_mut, Transfer};
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impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
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pub(super) async fn write_dma_u8(&mut self, write: *const [u8]) -> Result<(), Error>
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where
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Tx: TxDmaChannel<T>,
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{
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unsafe {
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T::regs().cr1().modify(|w| {
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w.set_spe(false);
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});
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}
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self.set_word_size(WordSize::EightBit);
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let tx_request = self.txdma.request();
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let tx_dst = T::regs().tx_ptr();
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unsafe { self.txdma.start_write(tx_request, write, tx_dst) }
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let tx_f = Transfer::new(&mut self.txdma);
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unsafe {
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T::regs().cr2().modify(|reg| {
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reg.set_txdmaen(true);
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});
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T::regs().cr1().modify(|w| {
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w.set_spe(true);
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});
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}
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tx_f.await;
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finish_dma(T::regs());
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Ok(())
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}
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pub(super) async fn read_dma_u8(&mut self, read: *mut [u8]) -> Result<(), Error>
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where
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Tx: TxDmaChannel<T>,
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Rx: RxDmaChannel<T>,
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{
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unsafe {
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T::regs().cr1().modify(|w| {
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w.set_spe(false);
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});
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T::regs().cr2().modify(|reg| {
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reg.set_rxdmaen(true);
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});
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}
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self.set_word_size(WordSize::EightBit);
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let (_, clock_byte_count) = slice_ptr_parts_mut(read);
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let rx_request = self.rxdma.request();
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let rx_src = T::regs().rx_ptr();
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unsafe { self.rxdma.start_read(rx_request, rx_src, read) };
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let rx_f = Transfer::new(&mut self.rxdma);
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let tx_request = self.txdma.request();
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let tx_dst = T::regs().tx_ptr();
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let clock_byte = 0x00u8;
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let tx_f = crate::dma::write_repeated(
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&mut self.txdma,
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tx_request,
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clock_byte,
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clock_byte_count,
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tx_dst,
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);
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unsafe {
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T::regs().cr2().modify(|reg| {
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reg.set_txdmaen(true);
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});
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T::regs().cr1().modify(|w| {
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w.set_spe(true);
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});
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}
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join(tx_f, rx_f).await;
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finish_dma(T::regs());
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Ok(())
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}
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pub(super) async fn transfer_dma_u8(
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&mut self,
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read: *mut [u8],
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write: *const [u8],
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) -> Result<(), Error>
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where
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Tx: TxDmaChannel<T>,
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Rx: RxDmaChannel<T>,
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{
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let (_, rx_len) = slice_ptr_parts(read);
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let (_, tx_len) = slice_ptr_parts(write);
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assert_eq!(rx_len, tx_len);
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unsafe {
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T::regs().cr1().modify(|w| {
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w.set_spe(false);
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});
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T::regs().cr2().modify(|reg| {
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reg.set_rxdmaen(true);
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});
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}
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self.set_word_size(WordSize::EightBit);
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let rx_request = self.rxdma.request();
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let rx_src = T::regs().rx_ptr();
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unsafe { self.rxdma.start_read(rx_request, rx_src, read) };
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let rx_f = Transfer::new(&mut self.rxdma);
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let tx_request = self.txdma.request();
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let tx_dst = T::regs().tx_ptr();
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unsafe { self.txdma.start_write(tx_request, write, tx_dst) }
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let tx_f = Transfer::new(&mut self.txdma);
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unsafe {
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T::regs().cr2().modify(|reg| {
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reg.set_txdmaen(true);
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});
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T::regs().cr1().modify(|w| {
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w.set_spe(true);
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});
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}
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join(tx_f, rx_f).await;
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finish_dma(T::regs());
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Ok(())
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}
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}
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