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rp/uart: extract fifo draining from blocking_read

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this will also be needed for dma operations.
This commit is contained in:
pennae 2023-04-30 11:30:55 +02:00
parent be66e0f7ce
commit 1d5adb8974
1 changed files with 28 additions and 24 deletions
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52
embassy-rp/src/uart/mod.rs
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@ -238,33 +238,37 @@ impl<'d, T: Instance, M: Mode> UartRx<'d, T, M> {
}
}
pub fn blocking_read(&mut self, buffer: &mut [u8]) -> Result<(), Error> {
let r = T::regs();
unsafe {
for b in buffer {
*b = loop {
if r.uartfr().read().rxfe() {
continue;
}
let dr = r.uartdr().read();
if dr.oe() {
return Err(Error::Overrun);
} else if dr.be() {
return Err(Error::Break);
} else if dr.pe() {
return Err(Error::Parity);
} else if dr.fe() {
return Err(Error::Framing);
} else {
break dr.data();
}
};
}
pub fn blocking_read(&mut self, mut buffer: &mut [u8]) -> Result<(), Error> {
while buffer.len() > 0 {
let received = self.drain_fifo(buffer)?;
buffer = &mut buffer[received..];
}
Ok(())
}
fn drain_fifo(&mut self, buffer: &mut [u8]) -> Result<usize, Error> {
let r = T::regs();
for (i, b) in buffer.iter_mut().enumerate() {
if unsafe { r.uartfr().read().rxfe() } {
return Ok(i);
}
let dr = unsafe { r.uartdr().read() };
if dr.oe() {
return Err(Error::Overrun);
} else if dr.be() {
return Err(Error::Break);
} else if dr.pe() {
return Err(Error::Parity);
} else if dr.fe() {
return Err(Error::Framing);
} else {
*b = dr.data();
}
}
Ok(buffer.len())
}
}
impl<'d, T: Instance> UartRx<'d, T, Blocking> {