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nrf/timer: add support for counter mode.

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This commit is contained in:
Dario Nieuwenhuis 2023-03-04 05:25:57 +01:00
parent 4314b823aa
commit 51478caad8
1 changed files with 38 additions and 5 deletions
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41
embassy-nrf/src/timer.rs
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@ -132,7 +132,21 @@ impl<'d, T: Instance> Timer<'d, T, Awaitable> {
irq.unpend();
irq.enable();
Self::new_inner(timer)
Self::new_inner(timer, false)
}
/// Create a new async-capable timer driver in counter mode.
pub fn new_awaitable_counter(
timer: impl Peripheral<P = T> + 'd,
irq: impl Peripheral<P = T::Interrupt> + 'd,
) -> Self {
into_ref!(irq);
irq.set_handler(Self::on_interrupt);
irq.unpend();
irq.enable();
Self::new_inner(timer, true)
}
}
@ -142,7 +156,15 @@ impl<'d, T: Instance> Timer<'d, T, NotAwaitable> {
/// This can be useful for triggering tasks via PPI
/// `Uarte` uses this internally.
pub fn new(timer: impl Peripheral<P = T> + 'd) -> Self {
Self::new_inner(timer)
Self::new_inner(timer, false)
}
/// Create a `Timer` driver in counter mode without an interrupt, meaning `Cc::wait` won't work.
///
/// This can be useful for triggering tasks via PPI
/// `Uarte` uses this internally.
pub fn new_counter(timer: impl Peripheral<P = T> + 'd) -> Self {
Self::new_inner(timer, true)
}
}
@ -150,7 +172,7 @@ impl<'d, T: Instance, I: TimerType> Timer<'d, T, I> {
/// Create a `Timer` without an interrupt, meaning `Cc::wait` won't work.
///
/// This is used by the public constructors.
fn new_inner(timer: impl Peripheral<P = T> + 'd) -> Self {
fn new_inner(timer: impl Peripheral<P = T> + 'd, is_counter: bool) -> Self {
into_ref!(timer);
let regs = T::regs();
@ -164,8 +186,11 @@ impl<'d, T: Instance, I: TimerType> Timer<'d, T, I> {
// since changing BITMODE while running can cause 'unpredictable behaviour' according to the specification.
this.stop();
// Set the instance to timer mode.
if is_counter {
regs.mode.write(|w| w.mode().counter());
} else {
regs.mode.write(|w| w.mode().timer());
}
// Make the counter's max value as high as possible.
// TODO: is there a reason someone would want to set this lower?
@ -225,6 +250,14 @@ impl<'d, T: Instance, I: TimerType> Timer<'d, T, I> {
Task::from_reg(&T::regs().tasks_clear)
}
/// Returns the COUNT task, for use with PPI.
///
/// When triggered, this task increments the timer's counter by 1.
/// Only works in counter mode.
pub fn task_count(&self) -> Task {
Task::from_reg(&T::regs().tasks_count)
}
/// Change the timer's frequency.
///
/// This will stop the timer if it isn't already stopped,