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enhanced docs for time driver

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Charles Edward Gagnon 2024-11-02 16:03:17 -04:00 committed by GitHub
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embassy-time-driver/src/lib.rs
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@ -109,12 +109,20 @@ pub trait Driver: Send + Sync + 'static {
/// Try allocating an alarm handle. Returns None if no alarms left.
/// Initially the alarm has no callback set, and a null `ctx` pointer.
///
/// The allocated alarm is a reusable resource and can be used multiple times.
/// Once the alarm has fired, it remains allocated and can be set again without needing
/// to be reallocated.
///
/// # Safety
/// It is UB to make the alarm fire before setting a callback.
unsafe fn allocate_alarm(&self) -> Option<AlarmHandle>;
/// Set the callback function to be called when the alarm triggers.
/// The callback may be called from any context (interrupt or thread mode).
///
/// The callback is maintained after the alarm has fired. Callers do not need
/// to set a callback again before setting another alarm, unless they want to
/// change the callback function or context.
fn set_alarm_callback(&self, alarm: AlarmHandle, callback: fn(*mut ()), ctx: *mut ());
/// Set an alarm at the given timestamp.