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stm32: Add some documentation to low_power

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This begins to explain the operation of the low-power executor.
This commit is contained in:
Ben Gamari
2023-10-30 13:36:52 -04:00
parent b6fc682117
commit aa97fe7cbd
2 changed files with 52 additions and 1 deletions
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6
embassy-stm32/src/time_driver.rs
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@ -345,6 +345,10 @@ impl RtcDriver {
});
}
#[cfg(feature = "low-power")]
/// The minimum pause time beyond which the executor will enter a low-power state.
pub(crate) const MIN_STOP_PAUSE: embassy_time::Duration = embassy_time::Duration::from_millis(250);
#[cfg(feature = "low-power")]
/// Pause the timer if ready; return err if not
pub(crate) fn pause_time(&self) -> Result<(), ()> {
@ -357,7 +361,7 @@ impl RtcDriver {
self.stop_wakeup_alarm(cs);
let time_until_next_alarm = self.time_until_next_alarm(cs);
if time_until_next_alarm < embassy_time::Duration::from_millis(250) {
if time_until_next_alarm < Self::MIN_STOP_PAUSE {
Err(())
} else {
self.rtc