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Adjust how we deal with read/write being different length.

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Including some docs about it.
Removing the Rx-enablement for write-only operations.
This commit is contained in:
Bob McWhirter
2021-07-22 09:28:42 -04:00
parent 67283c0cbd
commit 473a83a937
4 changed files with 11 additions and 9 deletions
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7
embassy-stm32/src/spi/v2.rs
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@ -163,9 +163,6 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
T::regs().cr1().modify(|w| {
w.set_spe(false);
});
T::regs().cr2().modify(|reg| {
reg.set_rxdmaen(true);
});
}
Self::set_word_size(WordSize::EightBit);
@ -245,6 +242,8 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
Tx: TxDmaChannel<T>,
Rx: RxDmaChannel<T>,
{
assert!(read.len() >= write.len());
unsafe {
T::regs().cr1().modify(|w| {
w.set_spe(false);
@ -257,7 +256,7 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
let rx_request = self.rxdma.request();
let rx_src = T::regs().dr().ptr() as *mut u8;
let rx_f = self.rxdma.read(rx_request, rx_src, read);
let rx_f = self.rxdma.read(rx_request, rx_src, read[0..write.len()]);
let tx_request = self.txdma.request();
let tx_dst = T::regs().dr().ptr() as *mut u8;