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Fix rtc using multiple alarms at the same time.

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This commit is contained in:
Dario Nieuwenhuis 2020-09-26 00:35:25 +02:00
parent f88f233e39
commit 37d2b440ff
2 changed files with 22 additions and 13 deletions
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31
embassy-nrf/src/rtc.rs
View file

@ -17,6 +17,10 @@ fn calc_now(period: u32, counter: u32) -> u64 {
((period as u64) << 23) + counter_shifted as u64 - 0x400000
}
fn compare_n(n: usize) -> u32 {
1 << (n + 16)
}
mod test {
use super::*;
@ -84,11 +88,11 @@ impl<T: Instance> RTC<T> {
}
pub fn start(&'static self) {
self.rtc.cc[0].write(|w| unsafe { w.bits(0x800000) });
self.rtc.cc[3].write(|w| unsafe { w.bits(0x800000) });
self.rtc.intenset.write(|w| {
let w = w.ovrflw().set();
let w = w.compare0().set();
let w = w.compare3().set();
w
});
@ -108,14 +112,14 @@ impl<T: Instance> RTC<T> {
self.next_period();
}
if self.rtc.events_compare[0].read().bits() == 1 {
self.rtc.events_compare[0].write(|w| w);
if self.rtc.events_compare[3].read().bits() == 1 {
self.rtc.events_compare[3].write(|w| w);
self.next_period();
}
for n in 0..ALARM_COUNT {
if self.rtc.events_compare[n + 1].read().bits() == 1 {
self.rtc.events_compare[n + 1].write(|w| w);
if self.rtc.events_compare[n].read().bits() == 1 {
self.rtc.events_compare[n].write(|w| w);
interrupt::free(|cs| {
self.trigger_alarm(n, cs);
})
@ -128,20 +132,21 @@ impl<T: Instance> RTC<T> {
let period = self.period.fetch_add(1, Ordering::Relaxed) + 1;
let t = (period as u64) << 23;
for alarm in self.alarms.borrow(cs) {
for n in 0..ALARM_COUNT {
let alarm = &self.alarms.borrow(cs)[n];
let at = alarm.timestamp.get();
let diff = at - t;
if diff < 0xc00000 {
self.rtc.cc[1].write(|w| unsafe { w.bits(at as u32 & 0xFFFFFF) });
self.rtc.intenset.write(|w| w.compare1().set());
self.rtc.cc[n].write(|w| unsafe { w.bits(at as u32 & 0xFFFFFF) });
self.rtc.intenset.write(|w| unsafe { w.bits(compare_n(n)) });
}
}
})
}
fn trigger_alarm(&self, n: usize, cs: &CriticalSection) {
self.rtc.intenclr.write(|w| w.compare1().clear());
self.rtc.intenclr.write(|w| unsafe { w.bits(compare_n(n)) });
let alarm = &self.alarms.borrow(cs)[n];
alarm.timestamp.set(u64::MAX);
@ -170,8 +175,8 @@ impl<T: Instance> RTC<T> {
let diff = timestamp - t;
if diff < 0xc00000 {
self.rtc.cc[1].write(|w| unsafe { w.bits(timestamp as u32 & 0xFFFFFF) });
self.rtc.intenset.write(|w| w.compare1().set());
self.rtc.cc[n].write(|w| unsafe { w.bits(timestamp as u32 & 0xFFFFFF) });
self.rtc.intenset.write(|w| unsafe { w.bits(compare_n(n)) });
// We may have been preempted for arbitrary time between checking if `at` is in the past
// and setting the cc. In that case, we don't know if the cc has triggered.
@ -183,7 +188,7 @@ impl<T: Instance> RTC<T> {
return;
}
} else {
self.rtc.intenclr.write(|w| w.compare1().clear());
self.rtc.intenclr.write(|w| unsafe { w.bits(compare_n(n)) });
}
})
}

4
embassy/src/time.rs
View file

@ -120,6 +120,10 @@ pub struct Duration {
}
impl Duration {
pub fn into_ticks(&self) -> u32 {
self.ticks
}
pub const fn from_ticks(ticks: u32) -> Duration {
Duration { ticks }
}