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timer-rtc: Already ask for the timer frequency

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This commit is contained in:
Thales Fragoso 2021-05-23 16:15:24 -03:00
parent e501932cb5
commit 90b25e70d7
1 changed files with 4 additions and 6 deletions
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10
embassy-stm32/src/rtc.rs
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@ -76,13 +76,13 @@ impl<T: Instance> RTC<T> {
} }
} }
pub fn start(&'static self, pfreq: Hertz, ppre: u8) { pub fn start(&'static self, timer_freq: Hertz) {
let inner = T::inner(); let inner = T::inner();
// NOTE(unsafe) Critical section to use the unsafe methods // NOTE(unsafe) Critical section to use the unsafe methods
critical_section::with(|_| { critical_section::with(|_| {
unsafe { unsafe {
inner.prepare(pfreq, ppre); inner.prepare(timer_freq);
} }
self.irq.set_handler_context(self as *const _ as *mut _); self.irq.set_handler_context(self as *const _ as *mut _);
@ -245,12 +245,10 @@ impl<T: Instance> embassy::time::Alarm for Alarm<T> {
pub struct TimerInner(pub(crate) TimGp16); pub struct TimerInner(pub(crate) TimGp16);
impl TimerInner { impl TimerInner {
unsafe fn prepare(&self, pfreq: Hertz, ppre: u8) { unsafe fn prepare(&self, timer_freq: Hertz) {
self.stop_and_reset(); self.stop_and_reset();
let multiplier = if ppre == 1 { 1 } else { 2 }; let psc = timer_freq.0 / TICKS_PER_SECOND as u32 - 1;
let freq = pfreq.0 * multiplier;
let psc = freq / TICKS_PER_SECOND as u32 - 1;
let psc: u16 = psc.try_into().unwrap(); let psc: u16 = psc.try_into().unwrap();
self.set_psc_arr(psc, u16::MAX); self.set_psc_arr(psc, u16::MAX);