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Flush MISO before transfer operation

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This commit is contained in:
Ulf Lilleengen
2021-12-02 11:38:43 +01:00
parent 9a730ef692
commit 81ec4c82fd
3 changed files with 11 additions and 2 deletions
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5
embassy-stm32/src/spi/v2.rs
View File

@ -262,6 +262,11 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
T::regs().cr2().modify(|reg| {
reg.set_rxdmaen(true);
});
// Flush the read buffer to avoid errornous data from being read
while T::regs().sr().read().rxne() {
let _ = T::regs().dr().read();
}
}
Self::set_word_size(WordSize::EightBit);

5
embassy-stm32/src/spi/v3.rs
View File

@ -284,6 +284,11 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
T::regs().cfg1().modify(|reg| {
reg.set_rxdmaen(true);
});
// Flush the read buffer to avoid errornous data from being read
while T::regs().sr().read().rxp() {
let _ = T::regs().rxdr().read();
}
}
let rx_request = self.rxdma.request();