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Cargo fmt

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This commit is contained in:
Nic0w 2021-05-02 08:42:51 +02:00
parent abf91a3687
commit 992bcdf47b
1 changed files with 86 additions and 95 deletions
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177
rp2040-hal/src/uart.rs
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@ -3,45 +3,33 @@
use core::convert::Infallible;
use core::ops::Deref;
use embedded_time::fixed_point::FixedPoint;
use embedded_time::rate::Baud;
use embedded_time::rate::Hertz;
use embedded_time::fixed_point::FixedPoint;
use embedded_hal::serial::{
Read,
Write
};
use embedded_hal::serial::{Read, Write};
use nb::Error::{
WouldBlock,
Other
};
use nb::Error::{Other, WouldBlock};
use crate::pac::{
uart0::{
uartlcr_h::W as UART_LCR_H_Writer,
RegisterBlock
},
UART0,
UART1
uart0::{uartlcr_h::W as UART_LCR_H_Writer, RegisterBlock},
UART0, UART1,
};
/// Error type for UART operations.
#[derive(Debug)]
pub enum Error {
/// Bad argument : when things overflow, ...
BadArgument
BadArgument,
}
/// When there's a read error.
pub struct ReadError<'err> {
/// The type of error
pub err_type: ReadErrorType,
/// Reference to the data that was read but eventually discared because of the error.
pub discared: &'err [u8]
pub discared: &'err [u8],
}
/// Possible types of read errors. See Chapter 4, Section 2 §8 - Table 436: "UARTDR Register"
@ -56,7 +44,7 @@ pub enum ReadErrorType {
Parity,
/// Triggered when the received character didn't have a valid stop bit.
Framing
Framing,
}
/// State of the UART Peripheral.
@ -86,7 +74,7 @@ pub enum DataBits {
/// 7 bits
Seven,
/// 8 bits
Eight
Eight,
}
/// Stop bits
@ -95,7 +83,7 @@ pub enum StopBits {
One,
/// 2 bits
Two
Two,
}
/// Parity
@ -105,21 +93,20 @@ pub enum Parity {
Odd,
/// Even parity
Even
Even,
}
/// A struct holding the configuration for an UART device.
pub struct UARTConfig {
baudrate: Baud,
data_bits: DataBits,
stop_bits: StopBits,
parity: Option<Parity>
parity: Option<Parity>,
}
/// Common configurations for UART.
pub mod common_configs {
use super::{ UARTConfig, DataBits, StopBits };
use super::{DataBits, StopBits, UARTConfig};
use embedded_time::rate::Baud;
/// 9600 baud, 8 data bits, no parity, 1 stop bit
@ -127,7 +114,7 @@ pub mod common_configs {
baudrate: Baud(9600),
data_bits: DataBits::Eight,
stop_bits: StopBits::One,
parity: None
parity: None,
};
/// 19200 baud, 8 data bits, no parity, 1 stop bit
@ -135,7 +122,7 @@ pub mod common_configs {
baudrate: Baud(19200),
data_bits: DataBits::Eight,
stop_bits: StopBits::One,
parity: None
parity: None,
};
/// 38400 baud, 8 data bits, no parity, 1 stop bit
@ -143,7 +130,7 @@ pub mod common_configs {
baudrate: Baud(38400),
data_bits: DataBits::Eight,
stop_bits: StopBits::One,
parity: None
parity: None,
};
/// 57600 baud, 8 data bits, no parity, 1 stop bit
@ -151,7 +138,7 @@ pub mod common_configs {
baudrate: Baud(57600),
data_bits: DataBits::Eight,
stop_bits: StopBits::One,
parity: None
parity: None,
};
/// 115200 baud, 8 data bits, no parity, 1 stop bit
@ -159,7 +146,7 @@ pub mod common_configs {
baudrate: Baud(115200),
data_bits: DataBits::Eight,
stop_bits: StopBits::One,
parity: None
parity: None,
};
}
@ -168,7 +155,7 @@ pub struct UARTPeripheral<S: State, D: UARTDevice> {
device: D,
_state: S,
config: UARTConfig,
effective_baudrate: Baud
effective_baudrate: Baud,
}
impl<S: State, D: UARTDevice> UARTPeripheral<S, D> {
@ -177,7 +164,7 @@ impl<S: State, D: UARTDevice> UARTPeripheral<S, D> {
device: self.device,
config: self.config,
effective_baudrate: self.effective_baudrate,
_state: state
_state: state,
}
}
@ -188,10 +175,12 @@ impl<S: State, D: UARTDevice> UARTPeripheral<S, D> {
}
impl<D: UARTDevice> UARTPeripheral<Disabled, D> {
/// Enables the provided UART device with the given configuration.
pub fn enable(mut device: D, config: UARTConfig, frequency: Hertz) -> Result<UARTPeripheral<Enabled, D>, Error> {
pub fn enable(
mut device: D,
config: UARTConfig,
frequency: Hertz,
) -> Result<UARTPeripheral<Enabled, D>, Error> {
let effective_baudrate = configure_baudrate(&mut device, &config.baudrate, &frequency)?;
// Enable the UART, both TX and RX
@ -216,16 +205,17 @@ impl<D: UARTDevice> UARTPeripheral<Disabled, D> {
});
Ok(UARTPeripheral {
device, config, effective_baudrate, _state: Enabled
device,
config,
effective_baudrate,
_state: Enabled,
})
}
}
impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
/// Disable this UART Peripheral, falling back to the Disabled state.
pub fn disable(self) -> UARTPeripheral<Disabled, D> {
// Disable the UART, both TX and RX
self.device.uartcr.write(|w| {
w.uarten().clear_bit();
@ -238,11 +228,11 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
}
pub(crate) fn transmit_flushed(&self) -> nb::Result<(), Infallible> {
if self.device.uartfr.read().txfe().bit_is_set() {
Ok(())
} else {
Err(WouldBlock)
}
else { Err(WouldBlock) }
}
fn uart_is_writable(&self) -> bool {
@ -259,17 +249,14 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
/// - some bytes were written, it is deemed to be a success
/// Upon success, the number of written bytes is returned.
pub fn write_raw<'d>(&self, data: &'d [u8]) -> nb::Result<&'d [u8], Infallible> {
let mut bytes_written = 0;
for c in data {
if !self.uart_is_writable() {
if bytes_written == 0 {
return Err(WouldBlock)
}
else {
return Ok(&data[bytes_written..])
return Err(WouldBlock);
} else {
return Ok(&data[bytes_written..]);
}
}
@ -280,7 +267,7 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
bytes_written += 1;
}
return Ok(&data[bytes_written..])
return Ok(&data[bytes_written..]);
}
/// Reads bytes from the UART.
@ -289,21 +276,18 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
/// - some bytes were read, it is deemed to be a success
/// Upon success, the number of read bytes is returned.
pub fn read_raw<'b>(&self, buffer: &'b mut [u8]) -> nb::Result<&'b mut [u8], ReadError<'b>> {
let mut bytes_read = 0;
Ok(loop {
if !self.uart_is_readable() {
if bytes_read == 0 {
return Err(WouldBlock)
}
else {
break &mut buffer[bytes_read..]
return Err(WouldBlock);
} else {
break &mut buffer[bytes_read..];
}
}
if bytes_read < buffer.len() {
let mut error: Option<ReadErrorType> = None;
if self.device.uartdr.read().oe().bit_is_set() {
@ -324,15 +308,15 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
if let Some(err_type) = error {
return Err(Other(ReadError {
err_type, discared: buffer
err_type,
discared: buffer,
}));
}
buffer[bytes_read] = self.device.uartdr.read().data().bits();
bytes_read += 1;
}
else {
break &mut buffer[bytes_read..]
} else {
break &mut buffer[bytes_read..];
}
})
}
@ -340,14 +324,13 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
/// Writes bytes to the UART.
/// This function blocks until the full buffer has been sent.
pub fn write_full_blocking(&self, data: &[u8]) {
let mut temp = data;
while !temp.is_empty() {
temp = match self.write_raw(temp) {
Ok(remaining) => remaining,
Err(WouldBlock) => continue,
Err(_) => unreachable!()
Err(_) => unreachable!(),
}
}
}
@ -359,37 +342,42 @@ impl<D: UARTDevice> UARTPeripheral<Enabled, D> {
while offset != buffer.len() {
offset += match self.read_raw(&mut buffer[offset..]) {
Ok(remaining) => { remaining.len() },
Ok(remaining) => remaining.len(),
Err(WouldBlock) => continue,
Err(_) => unreachable!()
Err(_) => unreachable!(),
}
}
}
}
/// Baudrate dividers calculation. Code inspired from the C SDK.
fn calculate_baudrate_dividers(wanted_baudrate: &Baud, frequency: &Hertz) -> Result<(u16, u16), Error> {
fn calculate_baudrate_dividers(
wanted_baudrate: &Baud,
frequency: &Hertz,
) -> Result<(u16, u16), Error> {
// baudrate_div = frequency * 8 / wanted_baudrate
let baudrate_div = frequency.checked_mul(&8).
and_then(|r| r.checked_div(wanted_baudrate.integer())).
ok_or(Error::BadArgument)?;
let baudrate_div = frequency
.checked_mul(&8)
.and_then(|r| r.checked_div(wanted_baudrate.integer()))
.ok_or(Error::BadArgument)?;
let baudrate_div: u32 = *baudrate_div.integer();
Ok(match (baudrate_div >> 7, ((baudrate_div & 0x7F) + 1) / 2) {
(0, _) => (1, 0),
(ibrd, _) if ibrd >= 65535 => (65535, 0),
(ibrd, fbrd) => (ibrd as u16, fbrd as u16)
(ibrd, fbrd) => (ibrd as u16, fbrd as u16),
})
}
/// Baudrate configuration. Code loosely inspired from the C SDK.
fn configure_baudrate(device: &mut dyn UARTDevice, wanted_baudrate: &Baud, frequency: &Hertz) -> Result<Baud, Error> {
fn configure_baudrate(
device: &mut dyn UARTDevice,
wanted_baudrate: &Baud,
frequency: &Hertz,
) -> Result<Baud, Error> {
let (baud_ibrd, baud_fbrd) = calculate_baudrate_dividers(wanted_baudrate, frequency)?;
// Load PL011's baud divisor registers
@ -404,39 +392,45 @@ fn configure_baudrate(device: &mut dyn UARTDevice, wanted_baudrate: &Baud, frequ
// PL011 needs a (dummy) line control register write to latch in the
// divisors. We don't want to actually change LCR contents here.
device.uartlcr_h.modify(|_,w| { w });
device.uartlcr_h.modify(|_, w| w);
Ok(Baud((4 * *frequency.integer()) / (64 * baud_ibrd + baud_fbrd) as u32))
Ok(Baud(
(4 * *frequency.integer()) / (64 * baud_ibrd + baud_fbrd) as u32,
))
}
/// Format configuration. Code loosely inspired from the C SDK.
fn set_format<'w>(w: &'w mut UART_LCR_H_Writer, data_bits: &DataBits, stop_bits: &StopBits, parity: &Option<Parity>) -> &'w mut UART_LCR_H_Writer {
fn set_format<'w>(
w: &'w mut UART_LCR_H_Writer,
data_bits: &DataBits,
stop_bits: &StopBits,
parity: &Option<Parity>,
) -> &'w mut UART_LCR_H_Writer {
match parity {
Some(p) => {
w.pen().set_bit();
match p {
Parity::Odd => w.eps().bit(false),
Parity::Even => w.eps().set_bit()
Parity::Even => w.eps().set_bit(),
};
},
None => { w.pen().bit(false); }
}
None => {
w.pen().bit(false);
}
};
unsafe { w.wlen().bits(
match data_bits {
DataBits::Five => { 0b00 }
DataBits::Six => { 0b01 }
DataBits::Seven => { 0b10 }
DataBits::Eight => { 0b11 }
}
)
unsafe {
w.wlen().bits(match data_bits {
DataBits::Five => 0b00,
DataBits::Six => 0b01,
DataBits::Seven => 0b10,
DataBits::Eight => 0b11,
})
};
match stop_bits {
StopBits::One => w.stp2().bit(false),
StopBits::Two => w.stp2().set_bit()
StopBits::Two => w.stp2().set_bit(),
};
w
@ -446,13 +440,11 @@ impl<D: UARTDevice> Read<u8> for UARTPeripheral<Enabled, D> {
type Error = Infallible;
fn read(&mut self) -> nb::Result<u8, Self::Error> {
let byte: &mut [u8] = &mut [0; 1];
if let Err(_) = self.read_raw(byte) {
Err(WouldBlock)
}
else {
} else {
Ok(byte[0])
}
}
@ -464,8 +456,7 @@ impl<D: UARTDevice> Write<u8> for UARTPeripheral<Enabled, D> {
fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
if let Err(_) = self.write_raw(&[word]) {
Err(WouldBlock)
}
else {
} else {
Ok(())
}
}