rust/va416xx-rs
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improve UART impl

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This commit is contained in:
Robin Müller 2024-09-24 11:57:35 +02:00
parent a50f7a947a
commit 0f31ee6983
Signed by: muellerr
GPG Key ID: A649FB78196E3849
1 changed files with 146 additions and 74 deletions
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220
va416xx-hal/src/uart.rs
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@ -9,6 +9,7 @@
//! - [UART simple example](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/examples/simple/examples/uart.rs)
//! - [UART echo with IRQ and Embassy](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/examples/embassy/src/bin/uart-echo-with-irq.rs)
//! - [Flashloader app using UART with IRQs](https://egit.irs.uni-stuttgart.de/rust/va416xx-rs/src/branch/main/flashloader)
use core::convert::Infallible;
use core::ops::Deref;
use embedded_hal_nb::serial::Read;
@ -69,17 +70,28 @@ impl RxPin<Uart2> for Pin<PF9, AltFunc1> {}
// Regular Definitions
//==================================================================================================
#[derive(Debug)]
#[derive(Debug, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum RxError {
Overrun,
Framing,
Parity,
}
#[derive(Debug, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Error {
Overrun,
FramingError,
ParityError,
Rx(RxError),
BreakCondition,
TransferPending,
BufferTooShort,
}
impl From<RxError> for Error {
fn from(value: RxError) -> Self {
Self::Rx(value)
}
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Event {
@ -295,43 +307,9 @@ enum IrqReceptionMode {
}
//==================================================================================================
// UART implementation
// UART peripheral wrapper
//==================================================================================================
/// Type erased variant of a UART. Can be created with the [Uart::downgrade] function.
pub struct UartBase<Uart> {
uart: Uart,
tx: Tx<Uart>,
rx: Rx<Uart>,
}
/// Serial abstraction. Entry point to create a new UART
pub struct Uart<UartInstance, Pins> {
inner: UartBase<UartInstance>,
pins: Pins,
}
/// Serial receiver.
///
/// Can be created by using the [Uart::split] or [UartBase::split] API.
pub struct Rx<Uart>(Uart);
/// Serial transmitter
///
/// Can be created by using the [Uart::split] or [UartBase::split] API.
pub struct Tx<Uart>(Uart);
impl<Uart: Instance> Rx<Uart> {
fn new(uart: Uart) -> Self {
Self(uart)
}
}
impl<Uart> Tx<Uart> {
fn new(uart: Uart) -> Self {
Self(uart)
}
}
pub trait Instance: Deref<Target = uart_base::RegisterBlock> {
const IDX: u8;
const PERIPH_SEL: PeripheralSelect;
@ -389,6 +367,17 @@ impl Instance for Uart2 {
}
}
//==================================================================================================
// UART implementation
//==================================================================================================
/// Type erased variant of a UART. Can be created with the [Uart::downgrade] function.
pub struct UartBase<Uart> {
uart: Uart,
tx: Tx<Uart>,
rx: Rx<Uart>,
}
impl<Uart: Instance> UartBase<Uart> {
fn init(self, config: Config, clocks: &Clocks) -> Self {
if Uart::IDX == 2 {
@ -522,6 +511,12 @@ impl<Uart: Instance> UartBase<Uart> {
}
}
/// Serial abstraction. Entry point to create a new UART
pub struct Uart<UartInstance, Pins> {
inner: UartBase<UartInstance>,
pins: Pins,
}
impl<TxPinInst: TxPin<UartInstance>, RxPinInst: RxPin<UartInstance>, UartInstance: Instance>
Uart<UartInstance, (TxPinInst, RxPinInst)>
{
@ -617,6 +612,17 @@ impl<TxPinInst: TxPin<UartInstance>, RxPinInst: RxPin<UartInstance>, UartInstanc
}
}
/// Serial receiver.
///
/// Can be created by using the [Uart::split] or [UartBase::split] API.
pub struct Rx<Uart>(Uart);
impl<Uart: Instance> Rx<Uart> {
fn new(uart: Uart) -> Self {
Self(uart)
}
}
impl<Uart: Instance> Rx<Uart> {
/// Direct access to the peripheral structure.
///
@ -642,6 +648,33 @@ impl<Uart: Instance> Rx<Uart> {
self.0.enable().modify(|_, w| w.rxenable().clear_bit());
}
/// Low level function to read a word from the UART FIFO.
///
/// Uses the [nb] API to allow usage in blocking and non-blocking contexts.
///
/// Please note that you might have to mask the returned value with 0xff to retrieve the actual
/// value if you use the manual parity mode. See chapter 11.4.1 for more information.
#[inline(always)]
pub fn read_fifo(&self) -> nb::Result<u32, Infallible> {
if self.0.rxstatus().read().rdavl().bit_is_clear() {
return Err(nb::Error::WouldBlock);
}
Ok(self.read_fifo_unchecked())
}
/// Low level function to read a word from from the UART FIFO.
///
/// This does not necesarily mean there is a word in the FIFO available.
/// Use the [Self::read_fifo] function to read a word from the FIFO reliably using the [nb]
/// API.
///
/// Please note that you might have to mask the returned value with 0xff to retrieve the actual
/// value if you use the manual parity mode. See chapter 11.4.1 for more information.
#[inline(always)]
pub fn read_fifo_unchecked(&self) -> u32 {
self.0.data().read().bits()
}
pub fn to_rx_with_irq(self) -> RxWithIrq<Uart> {
RxWithIrq(self)
}
@ -651,6 +684,17 @@ impl<Uart: Instance> Rx<Uart> {
}
}
/// Serial transmitter
///
/// Can be created by using the [Uart::split] or [UartBase::split] API.
pub struct Tx<Uart>(Uart);
impl<Uart> Tx<Uart> {
fn new(uart: Uart) -> Self {
Self(uart)
}
}
impl<Uart: Instance> Tx<Uart> {
/// Direct access to the peripheral structure.
///
@ -675,6 +719,32 @@ impl<Uart: Instance> Tx<Uart> {
pub fn disable(&mut self) {
self.0.enable().modify(|_, w| w.txenable().clear_bit());
}
/// Low level function to write a word to the UART FIFO.
///
/// Uses the [nb] API to allow usage in blocking and non-blocking contexts.
///
/// Please note that you might have to mask the returned value with 0xff to retrieve the actual
/// value if you use the manual parity mode. See chapter 11.4.1 for more information.
#[inline(always)]
pub fn write_fifo(&self, data: u32) -> nb::Result<(), Infallible> {
if self.0.txstatus().read().wrrdy().bit_is_clear() {
return Err(nb::Error::WouldBlock);
}
self.write_fifo_unchecked(data);
Ok(())
}
/// Low level function to write a word to the UART FIFO.
///
/// This does not necesarily mean that the FIFO can process another word because it might be
/// full.
/// Use the [Self::read_fifo] function to write a word to the FIFO reliably using the [nb]
/// API.
#[inline(always)]
pub fn write_fifo_unchecked(&self, data: u32) {
self.0.data().write(|w| unsafe { w.bits(data) });
}
}
#[derive(Default, Debug)]
@ -937,25 +1007,22 @@ impl<Uart: Instance> RxWithIrq<Uart> {
fn read_handler(
&self,
errors: &mut IrqUartError,
read_res: &nb::Result<u8, Error>,
read_res: &nb::Result<u8, RxError>,
) -> Option<u8> {
match read_res {
Ok(byte) => Some(*byte),
Err(nb::Error::WouldBlock) => None,
Err(nb::Error::Other(e)) => {
match e {
Error::Overrun => {
RxError::Overrun => {
errors.overflow = true;
}
Error::FramingError => {
RxError::Framing => {
errors.framing = true;
}
Error::ParityError => {
RxError::Parity => {
errors.parity = true;
}
_ => {
errors.other = true;
}
}
None
}
@ -1000,18 +1067,34 @@ impl embedded_io::Error for Error {
}
}
impl embedded_io::Error for RxError {
fn kind(&self) -> embedded_io::ErrorKind {
embedded_io::ErrorKind::Other
}
}
impl embedded_hal_nb::serial::Error for Error {
fn kind(&self) -> embedded_hal_nb::serial::ErrorKind {
embedded_hal_nb::serial::ErrorKind::Other
}
}
impl embedded_hal_nb::serial::Error for RxError {
fn kind(&self) -> embedded_hal_nb::serial::ErrorKind {
match self {
RxError::Overrun => embedded_hal_nb::serial::ErrorKind::Overrun,
RxError::Framing => embedded_hal_nb::serial::ErrorKind::FrameFormat,
RxError::Parity => embedded_hal_nb::serial::ErrorKind::Parity,
}
}
}
impl<Uart> embedded_io::ErrorType for Rx<Uart> {
type Error = Error;
type Error = RxError;
}
impl<Uart> embedded_hal_nb::serial::ErrorType for Rx<Uart> {
type Error = Error;
type Error = RxError;
}
impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for Rx<Uart> {
@ -1019,11 +1102,11 @@ impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for Rx<Uart> {
let uart = unsafe { &(*Uart::ptr()) };
let status_reader = uart.rxstatus().read();
let err = if status_reader.rxovr().bit_is_set() {
Some(Error::Overrun)
Some(RxError::Overrun)
} else if status_reader.rxfrm().bit_is_set() {
Some(Error::FramingError)
Some(RxError::Framing)
} else if status_reader.rxpar().bit_is_set() {
Some(Error::ParityError)
Some(RxError::Parity)
} else {
None
};
@ -1032,14 +1115,15 @@ impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for Rx<Uart> {
// and parity status bits. We have to read the DATA register
// so that the next status reflects the next DATA word
// For overrun error, we read as well to clear the peripheral
uart.data().read().bits();
Err(err.into())
} else if status_reader.rdavl().bit_is_set() {
let data = uart.data().read().bits();
Ok((data & 0xff) as u8)
} else {
Err(nb::Error::WouldBlock)
self.read_fifo_unchecked();
return Err(err.into());
}
self.read_fifo().map(|val| (val & 0xff) as u8).map_err(|e| {
if let nb::Error::Other(_) = e {
unreachable!()
}
nb::Error::WouldBlock
})
}
}
@ -1059,28 +1143,16 @@ impl<Uart: Instance> embedded_io::Read for Rx<Uart> {
}
impl<Uart> embedded_io::ErrorType for Tx<Uart> {
type Error = Error;
type Error = Infallible;
}
impl<Uart> embedded_hal_nb::serial::ErrorType for Tx<Uart> {
type Error = Error;
type Error = Infallible;
}
impl<Uart: Instance> embedded_hal_nb::serial::Write<u8> for Tx<Uart> {
fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
let reader = unsafe { &(*Uart::ptr()) }.txstatus().read();
if reader.wrrdy().bit_is_clear() {
return Err(nb::Error::WouldBlock);
} else {
// DPARITY bit not supported yet
unsafe {
// NOTE(unsafe) atomic write to data register
// NOTE(write_volatile) 8-bit write that's not
// possible through the svd2rust API
(*Uart::ptr()).data().write(|w| w.bits(word as u32));
}
}
Ok(())
self.write_fifo(word as u32)
}
fn flush(&mut self) -> nb::Result<(), Self::Error> {
@ -1123,7 +1195,7 @@ impl<UartInstance> embedded_hal_nb::serial::ErrorType for UartBase<UartInstance>
impl<Uart: Instance> embedded_hal_nb::serial::Read<u8> for UartBase<Uart> {
fn read(&mut self) -> nb::Result<u8, Self::Error> {
self.rx.read()
self.rx.read().map_err(|e| e.map(Error::Rx))
}
}