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Don't own DWT #7

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442fc8c
don't own DWT
jordens Feb 4, 2022
32f77ac
Merge remote-tracking branch 'upstream/master' into feature/ref-dwt
jordens Feb 15, 2022
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10 changes: 5 additions & 5 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,11 @@ use rtic_monotonic::Monotonic;
/// Note that the SysTick interrupt must not be disabled longer than half the
/// cycle counter overflow period (typically a couple seconds).
///
/// Note(Safety): Do not disable/enable or set/reset the DWT cycle counter.
///
/// When the `extend` feature is enabled, the cycle counter width is extended to
/// `u64` by detecting and counting overflows.
pub struct DwtSystick<const TIMER_HZ: u32> {
dwt: DWT,
systick: SYST,
#[cfg(feature = "extend")]
last: u64,
Expand All @@ -34,7 +35,7 @@ impl<const TIMER_HZ: u32> DwtSystick<TIMER_HZ> {
/// so the speed calculated at runtime and the declared speed (generic parameter
/// `TIMER_HZ`) can be compared.
#[inline(always)]
pub fn new(dcb: &mut DCB, mut dwt: DWT, mut systick: SYST, sysclk: u32) -> Self {
pub fn new(dcb: &mut DCB, dwt: &mut DWT, mut systick: SYST, sysclk: u32) -> Self {
assert!(TIMER_HZ == sysclk);

dcb.enable_trace();
Expand All @@ -50,7 +51,6 @@ impl<const TIMER_HZ: u32> DwtSystick<TIMER_HZ> {
// We do not start the counters here but in `reset()`.

DwtSystick {
dwt,
systick,
#[cfg(feature = "extend")]
last: 0,
Expand Down Expand Up @@ -98,8 +98,8 @@ impl<const TIMER_HZ: u32> Monotonic for DwtSystick<TIMER_HZ> {
self.systick.enable_counter();

// Enable and reset the cycle counter to locate the epoch.
self.dwt.enable_cycle_counter();
self.dwt.set_cycle_count(0);
(*DWT::PTR).ctrl.modify(|r| r | 1);
(*DWT::PTR).cyccnt.write(0);
}

fn set_compare(&mut self, val: Self::Instant) {
Expand Down