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stm32/uart: optimize swap_rx_tx

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This commit is contained in:
Alessandro Pezzato 2023-07-19 10:50:40 +02:00
parent 3df2c71e6c
commit 36ff688fab
1 changed files with 15 additions and 13 deletions
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28
embassy-stm32/src/usart/mod.rs
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@ -694,19 +694,21 @@ impl<'d, T: BasicInstance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
let r = T::regs();
#[allow(unused_variables)]
let swap_rx_tx = false;
#[cfg(any(usart_v3, usart_v4))]
let swap_rx_tx = config.swap_rx_tx;
if swap_rx_tx {
let (rx, tx) = (tx, rx);
rx.set_as_af(rx.af_num(), AFType::Input);
tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
} else {
rx.set_as_af(rx.af_num(), AFType::Input);
tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
// Some chips do not have swap_rx_tx bit
cfg_if::cfg_if! {
if #[cfg(any(usart_v3, usart_v4))] {
if config.swap_rx_tx {
let (rx, tx) = (tx, rx);
rx.set_as_af(rx.af_num(), AFType::Input);
tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
} else {
rx.set_as_af(rx.af_num(), AFType::Input);
tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
}
} else {
rx.set_as_af(rx.af_num(), AFType::Input);
tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
}
}
configure(r, &config, T::frequency(), T::KIND, true, true);