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Merge pull request #1356 from embassy-rs/peripheralref-no-mut

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Do not require mut in PeripheralRef clone_unchecked, make nRF timer `cc()` borrows less strict.
This commit is contained in:
Dario Nieuwenhuis 2023-04-12 00:03:46 +02:00 committed by GitHub
commit 201a038134
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 18 additions and 19 deletions
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2
embassy-hal-common/src/macros.rs
View file

@ -92,7 +92,7 @@ macro_rules! impl_peripheral {
type P = $type;
#[inline]
unsafe fn clone_unchecked(&mut self) -> Self::P {
unsafe fn clone_unchecked(&self) -> Self::P {
$type { ..*self }
}
}

12
embassy-hal-common/src/peripheral.rs
View file

@ -39,7 +39,7 @@ impl<'a, T> PeripheralRef<'a, T> {
/// You should strongly prefer using `reborrow()` instead. It returns a
/// `PeripheralRef` that borrows `self`, which allows the borrow checker
/// to enforce this at compile time.
pub unsafe fn clone_unchecked(&mut self) -> PeripheralRef<'a, T>
pub unsafe fn clone_unchecked(&self) -> PeripheralRef<'a, T>
where
T: Peripheral<P = T>,
{
@ -146,14 +146,14 @@ pub trait Peripheral: Sized {
///
/// You should strongly prefer using `into_ref()` instead. It returns a
/// `PeripheralRef`, which allows the borrow checker to enforce this at compile time.
unsafe fn clone_unchecked(&mut self) -> Self::P;
unsafe fn clone_unchecked(&self) -> Self::P;
/// Convert a value into a `PeripheralRef`.
///
/// When called on an owned `T`, yields a `PeripheralRef<'static, T>`.
/// When called on an `&'a mut T`, yields a `PeripheralRef<'a, T>`.
#[inline]
fn into_ref<'a>(mut self) -> PeripheralRef<'a, Self::P>
fn into_ref<'a>(self) -> PeripheralRef<'a, Self::P>
where
Self: 'a,
{
@ -161,14 +161,14 @@ pub trait Peripheral: Sized {
}
}
impl<'b, T: DerefMut> Peripheral for T
impl<'b, T: Deref> Peripheral for T
where
T::Target: Peripheral,
{
type P = <T::Target as Peripheral>::P;
#[inline]
unsafe fn clone_unchecked(&mut self) -> Self::P {
self.deref_mut().clone_unchecked()
unsafe fn clone_unchecked(&self) -> Self::P {
self.deref().clone_unchecked()
}
}

2
embassy-nrf/src/buffered_uarte.rs
View file

@ -342,7 +342,7 @@ impl<'d, U: UarteInstance, T: TimerInstance> BufferedUarte<'d, U, T> {
r.enable.write(|w| w.enable().enabled());
// Configure byte counter.
let mut timer = Timer::new_counter(timer);
let timer = Timer::new_counter(timer);
timer.cc(1).write(rx_buffer.len() as u32 * 2);
timer.cc(1).short_compare_clear();
timer.clear();

2
embassy-nrf/src/saadc.rs
View file

@ -315,7 +315,7 @@ impl<'d, const N: usize> Saadc<'d, N> {
Ppi::new_one_to_one(ppi_ch1, Event::from_reg(&r.events_end), Task::from_reg(&r.tasks_start));
start_ppi.enable();
let mut timer = Timer::new(timer);
let timer = Timer::new(timer);
timer.set_frequency(frequency);
timer.cc(0).write(sample_counter);
timer.cc(0).short_compare_clear();

6
embassy-nrf/src/timer.rs
View file

@ -117,7 +117,7 @@ impl<'d, T: Instance> Timer<'d, T> {
let regs = T::regs();
let mut this = Self { _p: timer };
let this = Self { _p: timer };
// Stop the timer before doing anything else,
// since changing BITMODE while running can cause 'unpredictable behaviour' according to the specification.
@ -213,13 +213,13 @@ impl<'d, T: Instance> Timer<'d, T> {
///
/// # Panics
/// Panics if `n` >= the number of CC registers this timer has (4 for a normal timer, 6 for an extended timer).
pub fn cc(&mut self, n: usize) -> Cc<T> {
pub fn cc(&self, n: usize) -> Cc<'d, T> {
if n >= T::CCS {
panic!("Cannot get CC register {} of timer with {} CC registers.", n, T::CCS);
}
Cc {
n,
_p: self._p.reborrow(),
_p: unsafe { self._p.clone_unchecked() },
}
}
}

2
embassy-nrf/src/uarte.rs
View file

@ -205,7 +205,7 @@ impl<'d, T: Instance> Uarte<'d, T> {
ppi_ch1: impl Peripheral<P = impl ConfigurableChannel + 'd> + 'd,
ppi_ch2: impl Peripheral<P = impl ConfigurableChannel + 'd> + 'd,
) -> (UarteTx<'d, T>, UarteRxWithIdle<'d, T, U>) {
let mut timer = Timer::new(timer);
let timer = Timer::new(timer);
into_ref!(ppi_ch1, ppi_ch2);

2
embassy-nrf/src/usb/mod.rs
View file

@ -153,7 +153,7 @@ impl<'d, T: Instance, V: VbusDetect + 'd> driver::Driver<'d> for Driver<'d, T, V
}))
}
fn start(mut self, control_max_packet_size: u16) -> (Self::Bus, Self::ControlPipe) {
fn start(self, control_max_packet_size: u16) -> (Self::Bus, Self::ControlPipe) {
(
Bus {
_p: unsafe { self._p.clone_unchecked() },

2
embassy-stm32/build.rs
View file

@ -180,7 +180,7 @@ fn main() {
#[cfg(flash)]
impl<'d> FlashLayout<'d> {
pub(crate) fn new(mut p: embassy_hal_common::PeripheralRef<'d, crate::peripherals::FLASH>) -> Self {
pub(crate) fn new(p: embassy_hal_common::PeripheralRef<'d, crate::peripherals::FLASH>) -> Self {
Self {
#(#inits),*
}

3
embassy-stm32/src/flash/common.rs
View file

@ -33,8 +33,7 @@ impl<'d> Flash<'d> {
}
pub(crate) fn release(self) -> PeripheralRef<'d, crate::peripherals::FLASH> {
let mut flash = self;
unsafe { flash.inner.clone_unchecked() }
unsafe { self.inner.clone_unchecked() }
}
}

2
embassy-stm32/src/flash/f4.rs
View file

@ -67,7 +67,7 @@ mod alt_regions {
// SAFETY: We never expose the cloned peripheral references, and their instance is not public.
// Also, all flash region operations are protected with a cs.
let mut p = self.release();
let p = self.release();
AltFlashLayout {
bank1_region1: Bank1Region1(&BANK1_REGION1, unsafe { p.clone_unchecked() }),
bank1_region2: Bank1Region2(&BANK1_REGION2, unsafe { p.clone_unchecked() }),

2
embassy-stm32/src/gpio.rs
View file

@ -29,7 +29,7 @@ impl<'d, T: Pin> Flex<'d, T> {
}
#[inline]
pub fn degrade(mut self) -> Flex<'d, AnyPin> {
pub fn degrade(self) -> Flex<'d, AnyPin> {
// Safety: We are about to drop the other copy of this pin, so
// this clone is safe.
let pin = unsafe { self.pin.clone_unchecked() };