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bxcan: Disable on drop

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Timo Kröger 2021-08-06 10:37:32 +02:00 committed by Dario Nieuwenhuis
parent 7c405250a7
commit dc6b7f3cba
1 changed files with 23 additions and 6 deletions
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23
embassy-stm32/src/bxcan.rs
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@ -26,11 +26,11 @@ impl<'d, T: Instance + bxcan::Instance> Can<'d, T> {
unsafe {
rx.set_as_af(rx.af_num());
tx.set_as_af(tx.af_num());
}
T::enable();
T::reset();
// TODO: CAN2 also required CAN1 clock
}
Self {
phantom: PhantomData,
@ -39,6 +39,17 @@ impl<'d, T: Instance + bxcan::Instance> Can<'d, T> {
}
}
impl<'d, T: Instance + bxcan::Instance> Drop for Can<'d, T> {
fn drop(&mut self) {
// Cannot call `free()` because it moves the instance.
// Manually reset the peripheral.
unsafe {
T::regs().mcr().write(|w| w.set_reset(true));
}
T::disable();
}
}
impl<'d, T: Instance + bxcan::Instance> Deref for Can<'d, T> {
type Target = bxcan::Can<T>;
@ -56,7 +67,9 @@ impl<'d, T: Instance + bxcan::Instance> DerefMut for Can<'d, T> {
pub(crate) mod sealed {
use super::*;
pub trait Instance {}
pub trait Instance {
fn regs() -> &'static crate::pac::bxcan::Can;
}
pub trait RxPin<T: Instance>: Pin {
fn af_num(&self) -> u8;
@ -73,7 +86,11 @@ pub trait TxPin<T: Instance>: sealed::TxPin<T> {}
crate::pac::peripherals!(
(bxcan, $inst:ident) => {
impl sealed::Instance for peripherals::$inst {}
impl sealed::Instance for peripherals::$inst {
fn regs() -> &'static crate::pac::bxcan::Can {
&crate::pac::$inst
}
}
impl Instance for peripherals::$inst {}