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nrf/uarte: do not use WFE on drop.

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- It disturbs other stuff that uses WFE/SEV in the system. I ran into
  issues with this.
- It needs the irq handler to check for RXTO/TXSTOPPED errors, which makes
  it slower.
This commit is contained in:
Dario Nieuwenhuis 2021-10-16 03:14:47 +02:00
parent 05bc4d198e
commit 66d70cd146
1 changed files with 1 additions and 14 deletions
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15
embassy-nrf/src/uarte.rs
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@ -187,13 +187,6 @@ impl<'d, T: Instance> Uarte<'d, T> {
s.endtx_waker.wake();
r.intenclr.write(|w| w.endtx().clear());
}
if r.events_rxto.read().bits() != 0 {
r.intenclr.write(|w| w.rxto().clear());
}
if r.events_txstopped.read().bits() != 0 {
r.intenclr.write(|w| w.txstopped().clear());
}
}
}
@ -208,15 +201,9 @@ impl<'a, T: Instance> Drop for Uarte<'a, T> {
info!("did_stoprx {} did_stoptx {}", did_stoprx, did_stoptx);
// Wait for rxto or txstopped, if needed.
r.intenset.write(|w| w.rxto().set().txstopped().set());
while (did_stoprx && r.events_rxto.read().bits() == 0)
|| (did_stoptx && r.events_txstopped.read().bits() == 0)
{
info!("uarte drop: wfe");
cortex_m::asm::wfe();
}
cortex_m::asm::sev();
{}
// Finally we can disable!
r.enable.write(|w| w.enable().disabled());