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Enable timer clock in RCC on timer start

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* Moves the tim2-specific code into macro which always uses TIM2
* For peripherals without clock specified, attempt to locate enable and
  reset registers in the RCC block matching the peripheral name. This
  could be useful for peripherals where deducing the clock name might
  not be feasible, but it remains to be tested with more chip families
  to see if it is sufficiently accurate.
This commit is contained in:
Ulf Lilleengen
2021-06-10 09:31:41 +02:00
parent 37fbc5fcc4
commit 0a9022d59f
3 changed files with 44 additions and 45 deletions
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24
embassy-stm32/src/clock.rs
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@ -11,6 +11,7 @@ use embassy::time::{Clock as EmbassyClock, TICKS_PER_SECOND};
use crate::interrupt::{CriticalSection, Interrupt, Mutex};
use crate::pac::timer::TimGp16;
use crate::peripherals;
use crate::rcc::RccPeripheral;
use crate::time::Hertz;
// Clock timekeeping works with something we call "periods", which are time intervals
@ -76,27 +77,12 @@ impl<T: Instance> Clock<T> {
}
}
// TODO: Temporary until clock code generation is in place
pub fn start_tim2(&'static self) {
cfg_if::cfg_if! {
if #[cfg(rcc_l0)] {
unsafe {
let rcc = crate::pac::RCC;
rcc.apb1enr()
.modify(|w| w.set_tim2en(true));
rcc.apb1rstr().modify(|w| w.set_tim2rst(true));
rcc.apb1rstr().modify(|w| w.set_tim2rst(false));
}
let timer_freq = unsafe { crate::rcc::get_freqs().apb1_clk };
self.start(timer_freq);
}
}
}
pub fn start(&'static self, timer_freq: Hertz) {
let inner = T::inner();
T::enable();
T::reset();
// NOTE(unsafe) Critical section to use the unsafe methods
critical_section::with(|_| {
unsafe {
@ -359,7 +345,7 @@ pub(crate) mod sealed {
}
}
pub trait Instance: sealed::Instance + Sized + 'static {}
pub trait Instance: sealed::Instance + Sized + RccPeripheral + 'static {}
macro_rules! impl_timer {
($inst:ident) => {