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moved CC::wait to awaitable typestate

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This commit is contained in:
f_punk 2021-09-01 16:20:32 +02:00
parent a0c40562ea
commit 1cef7134d4
1 changed files with 34 additions and 34 deletions
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68
embassy-nrf/src/timer.rs
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@ -260,7 +260,40 @@ pub struct Cc<'a, T: Instance, I: TimerType> {
phantom2: PhantomData<I>,
}
impl<'a, T: Instance> Cc<'a, T, Awaitable> {}
impl<'a, T: Instance> Cc<'a, T, Awaitable> {
/// Wait until the timer's counter reaches the value stored in this register.
///
/// This requires a mutable reference so that this task's waker cannot be overwritten by a second call to `wait`.
pub async fn wait(&mut self) {
let regs = T::regs();
// Enable the interrupt for this CC's COMPARE event.
regs.intenset
.modify(|r, w| unsafe { w.bits(r.bits() | (1 << (16 + self.n))) });
// Disable the interrupt if the future is dropped.
let on_drop = OnDrop::new(|| {
regs.intenclr
.modify(|r, w| unsafe { w.bits(r.bits() | (1 << (16 + self.n))) });
});
poll_fn(|cx| {
T::waker(self.n).register(cx.waker());
if regs.events_compare[self.n].read().bits() != 0 {
// Reset the register for next time
regs.events_compare[self.n].reset();
Poll::Ready(())
} else {
Poll::Pending
}
})
.await;
// The interrupt was already disabled in the interrupt handler, so there's no need to disable it again.
on_drop.defuse();
}
}
impl<'a, T: Instance> Cc<'a, T, NotAwaitable> {}
impl<'a, T: Instance, I: TimerType> Cc<'a, T, I> {
@ -332,37 +365,4 @@ impl<'a, T: Instance, I: TimerType> Cc<'a, T, I> {
.shorts
.modify(|r, w| unsafe { w.bits(r.bits() & !(1 << (8 + self.n))) })
}
/// Wait until the timer's counter reaches the value stored in this register.
///
/// This requires a mutable reference so that this task's waker cannot be overwritten by a second call to `wait`.
pub async fn wait(&mut self) {
let regs = T::regs();
// Enable the interrupt for this CC's COMPARE event.
regs.intenset
.modify(|r, w| unsafe { w.bits(r.bits() | (1 << (16 + self.n))) });
// Disable the interrupt if the future is dropped.
let on_drop = OnDrop::new(|| {
regs.intenclr
.modify(|r, w| unsafe { w.bits(r.bits() | (1 << (16 + self.n))) });
});
poll_fn(|cx| {
T::waker(self.n).register(cx.waker());
if regs.events_compare[self.n].read().bits() != 0 {
// Reset the register for next time
regs.events_compare[self.n].reset();
Poll::Ready(())
} else {
Poll::Pending
}
})
.await;
// The interrupt was already disabled in the interrupt handler, so there's no need to disable it again.
on_drop.defuse();
}
}