127 lines
3.0 KiB
Rust
127 lines
3.0 KiB
Rust
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use core::marker::PhantomData;
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use embassy::util::Unborrow;
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use embassy_extras::unborrow;
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use crate::gpio::{NoPin, Pin};
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use crate::pac::usart::{regs, vals, Usart};
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use crate::peripherals;
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use super::*;
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub enum DataBits {
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DataBits8,
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DataBits9,
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}
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub enum Parity {
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ParityNone,
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ParityEven,
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ParityOdd,
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}
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub enum StopBits {
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#[doc = "1 stop bit"]
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STOP1,
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#[doc = "0.5 stop bits"]
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STOP0P5,
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#[doc = "2 stop bits"]
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STOP2,
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#[doc = "1.5 stop bits"]
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STOP1P5,
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}
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#[non_exhaustive]
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub struct Config {
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pub baudrate: u32,
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pub data_bits: DataBits,
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pub stop_bits: StopBits,
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pub parity: Parity,
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}
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impl Default for Config {
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fn default() -> Self {
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Self {
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baudrate: 115200,
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data_bits: DataBits::DataBits8,
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stop_bits: StopBits::STOP1,
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parity: Parity::ParityNone,
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}
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}
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}
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pub struct Uart<'d, T: Instance> {
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inner: T,
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phantom: PhantomData<&'d mut T>,
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}
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impl<'d, T: Instance> Uart<'d, T> {
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pub fn new(
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inner: impl Unborrow<Target = T>,
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rx: impl Unborrow<Target = impl RxPin<T>>,
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tx: impl Unborrow<Target = impl TxPin<T>>,
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config: Config,
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pclk_freq: u32,
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) -> Self {
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unborrow!(inner, rx, tx);
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// TODO: enable in RCC
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// TODO: better calculation, including error checking and OVER8 if possible.
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let div = (pclk_freq + (config.baudrate / 2)) / config.baudrate;
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let r = inner.regs();
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unsafe {
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rx.set_as_af(rx.af_num());
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tx.set_as_af(tx.af_num());
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r.brr().write_value(regs::Brr(div));
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r.cr1().write(|w| {
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w.set_ue(true);
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w.set_te(true);
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w.set_re(true);
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w.set_m(vals::M::M8);
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w.set_pce(config.parity != Parity::ParityNone);
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w.set_ps(match config.parity {
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Parity::ParityOdd => vals::Ps::ODD,
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Parity::ParityEven => vals::Ps::EVEN,
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_ => vals::Ps::EVEN,
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});
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});
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r.cr2().write(|_w| {});
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r.cr3().write(|_w| {});
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}
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Self {
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inner,
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phantom: PhantomData,
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}
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}
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}
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impl<'d, T: Instance> embedded_hal::blocking::serial::Write<u8> for Uart<'d, T> {
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type Error = Error;
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fn bwrite_all(&mut self, buffer: &[u8]) -> Result<(), Self::Error> {
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unsafe {
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let r = self.inner.regs();
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for &b in buffer {
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while !r.sr().read().txe() {}
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r.dr().write_value(regs::Dr(b as u32))
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}
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}
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Ok(())
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}
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fn bflush(&mut self) -> Result<(), Self::Error> {
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unsafe {
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let r = self.inner.regs();
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while !r.sr().read().tc() {}
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}
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Ok(())
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}
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}
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