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embassy-stm32: Add hardware flow control constructor for UartRx and UartTx

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This commit is contained in:
Guillaume MICHEL 2022-10-27 10:52:21 +02:00
parent 4e61d83555
commit 9423987ac5
1 changed files with 113 additions and 4 deletions
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117
embassy-stm32/src/usart/mod.rs
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@ -102,7 +102,80 @@ pub struct UartRx<'d, T: BasicInstance, RxDma = NoDma> {
}
impl<'d, T: BasicInstance, TxDma> UartTx<'d, T, TxDma> {
fn new(tx_dma: PeripheralRef<'d, TxDma>) -> Self {
/// usefull if you only want Uart Tx. It saves 1 pin and consumes a little less power
pub fn new(
peri: impl Peripheral<P = T> + 'd,
tx: impl Peripheral<P = impl TxPin<T>> + 'd,
tx_dma: impl Peripheral<P = TxDma> + 'd,
config: Config,
) -> Self {
T::enable();
T::reset();
Self::new_inner(peri, tx, tx_dma, config)
}
pub fn new_with_cts(
peri: impl Peripheral<P = T> + 'd,
tx: impl Peripheral<P = impl TxPin<T>> + 'd,
cts: impl Peripheral<P = impl CtsPin<T>> + 'd,
tx_dma: impl Peripheral<P = TxDma> + 'd,
config: Config,
) -> Self {
into_ref!(cts);
T::enable();
T::reset();
unsafe {
cts.set_as_af(cts.af_num(), AFType::Input);
T::regs().cr3().write(|w| {
w.set_ctse(true);
});
}
Self::new_inner(peri, tx, tx_dma, config)
}
fn new_inner(
_peri: impl Peripheral<P = T> + 'd,
tx: impl Peripheral<P = impl TxPin<T>> + 'd,
tx_dma: impl Peripheral<P = TxDma> + 'd,
config: Config,
) -> Self {
into_ref!(_peri, tx, tx_dma);
let r = T::regs();
configure(r, &config, T::frequency(), T::MULTIPLIER);
unsafe {
tx.set_as_af(tx.af_num(), AFType::OutputPushPull);
r.cr2().write(|_w| {});
r.cr1().write(|w| {
// enable uart
w.set_ue(true);
// enable transceiver
w.set_te(true);
// configure word size
w.set_m0(if config.parity != Parity::ParityNone {
vals::M0::BIT9
} else {
vals::M0::BIT8
});
// configure parity
w.set_pce(config.parity != Parity::ParityNone);
w.set_ps(match config.parity {
Parity::ParityOdd => vals::Ps::ODD,
Parity::ParityEven => vals::Ps::EVEN,
_ => vals::Ps::EVEN,
});
});
}
// create state once!
let _s = T::state();
Self {
tx_dma,
phantom: PhantomData,
@ -156,11 +229,44 @@ impl<'d, T: BasicInstance, RxDma> UartRx<'d, T, RxDma> {
rx_dma: impl Peripheral<P = RxDma> + 'd,
config: Config,
) -> Self {
into_ref!(peri, irq, rx, rx_dma);
T::enable();
T::reset();
Self::new_inner(peri, irq, rx, rx_dma, config)
}
pub fn new_with_rts(
peri: impl Peripheral<P = T> + 'd,
irq: impl Peripheral<P = T::Interrupt> + 'd,
rx: impl Peripheral<P = impl RxPin<T>> + 'd,
rts: impl Peripheral<P = impl RtsPin<T>> + 'd,
rx_dma: impl Peripheral<P = RxDma> + 'd,
config: Config,
) -> Self {
into_ref!(rts);
T::enable();
T::reset();
unsafe {
rts.set_as_af(rts.af_num(), AFType::OutputPushPull);
T::regs().cr3().write(|w| {
w.set_rtse(true);
});
}
Self::new_inner(peri, irq, rx, rx_dma, config)
}
fn new_inner(
peri: impl Peripheral<P = T> + 'd,
irq: impl Peripheral<P = T::Interrupt> + 'd,
rx: impl Peripheral<P = impl RxPin<T>> + 'd,
rx_dma: impl Peripheral<P = RxDma> + 'd,
config: Config,
) -> Self {
into_ref!(peri, irq, rx, rx_dma);
let r = T::regs();
configure(r, &config, T::frequency(), T::MULTIPLIER);
@ -169,7 +275,7 @@ impl<'d, T: BasicInstance, RxDma> UartRx<'d, T, RxDma> {
rx.set_as_af(rx.af_num(), AFType::Input);
r.cr2().write(|_w| {});
r.cr3().write(|w| {
r.cr3().modify(|w| {
// enable Error Interrupt: (Frame error, Noise error, Overrun error)
w.set_eie(true);
});
@ -596,7 +702,10 @@ impl<'d, T: BasicInstance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
let _s = T::state();
Self {
tx: UartTx::new(tx_dma),
tx: UartTx {
tx_dma,
phantom: PhantomData,
},
rx: UartRx {
_peri: peri,
rx_dma,