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Added AlarmX::disable_interrupt, made AlarmX::schedule able to return an error if the time is too short

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Victor Koenders 2021-11-16 16:50:44 +01:00
parent 119c5a94e8
commit 97a5bd355c
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GPG key ID: 2E441540865B8A1C
1 changed files with 30 additions and 5 deletions
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35
rp2040-hal/src/timer.rs
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@ -221,17 +221,34 @@ macro_rules! impl_alarm {
Self::timer().inte.modify(|_, w| w.$int_alarm().set_bit());
}
/// Disable this alarm, preventing it from triggering an interrupt.
pub fn disable_interrupt(&mut self) {
Self::timer().inte.modify(|_, w| w.$int_alarm().clear_bit());
}
/// Schedule the alarm to be finished after `countdown`. If [enable_interrupt] is called, this will trigger interrupt `
#[doc = $int_name]
/// ` whenever this time elapses.
///
/// The RP2040 has been observed to take a little while to schedule an alarm. For this reason, the minimum time that this function accepts is `10.microseconds()`
///
/// [enable_interrupt]: #method.enable_interrupt
pub fn schedule<TIME: Into<Microseconds>>(&mut self, countdown: TIME) {
pub fn schedule<TIME: Into<Microseconds>>(
&mut self,
countdown: TIME,
) -> Result<(), ScheduleAlarmError> {
let duration = countdown.into().0;
let target_time = Self::timer().timelr.read().bits().wrapping_add(duration);
Self::timer()
.$timer_alarm
.write(|w| unsafe { w.bits(target_time) });
const MIN_MICROSECONDS: u32 = 10;
if duration < MIN_MICROSECONDS {
return Err(ScheduleAlarmError::AlarmTooSoon);
} else {
let target_time = Self::timer().timelr.read().bits().wrapping_add(duration);
Self::timer()
.$timer_alarm
.write(|w| unsafe { w.bits(target_time) });
Ok(())
}
}
/// Return true if this alarm is finished.
@ -243,6 +260,14 @@ macro_rules! impl_alarm {
};
}
/// Errors that can be returned from any of the `AlarmX::schedule` methods.
#[non_exhaustive]
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum ScheduleAlarmError {
/// Alarm time is too low. Should be at least 10 microseconds.
AlarmTooSoon,
}
impl_alarm!(Alarm0 {
rb: alarm0,
int: alarm_0,