diff --git a/embassy-nrf/src/buffered_uarte.rs b/embassy-nrf/src/buffered_uarte.rs index fec875cb..6e85a159 100644 --- a/embassy-nrf/src/buffered_uarte.rs +++ b/embassy-nrf/src/buffered_uarte.rs @@ -26,7 +26,7 @@ use embassy_sync::waitqueue::WakerRegistration; // Re-export SVD variants to allow user to directly set values pub use pac::uarte0::{baudrate::BAUDRATE_A as Baudrate, config::PARITY_A as Parity}; -use crate::gpio::Pin as GpioPin; +use crate::gpio::{self, Pin as GpioPin}; use crate::interrupt::InterruptExt; use crate::ppi::{AnyConfigurableChannel, ConfigurableChannel, Event, Ppi, Task}; use crate::timer::{Frequency, Instance as TimerInstance, Timer}; @@ -428,21 +428,23 @@ impl<'a, U: UarteInstance, T: TimerInstance> Drop for StateInner<'a, U, T> { fn drop(&mut self) { let r = U::regs(); - // TODO this probably deadlocks. do like Uarte instead. - self.timer.stop(); - if let RxState::Receiving = self.rx_state { - r.tasks_stoprx.write(|w| unsafe { w.bits(1) }); - } - if let TxState::Transmitting(_) = self.tx_state { - r.tasks_stoptx.write(|w| unsafe { w.bits(1) }); - } - if let RxState::Receiving = self.rx_state { - low_power_wait_until(|| r.events_endrx.read().bits() == 1); - } - if let TxState::Transmitting(_) = self.tx_state { - low_power_wait_until(|| r.events_endtx.read().bits() == 1); - } + + r.inten.reset(); + r.events_rxto.reset(); + r.tasks_stoprx.write(|w| unsafe { w.bits(1) }); + r.events_txstopped.reset(); + r.tasks_stoptx.write(|w| unsafe { w.bits(1) }); + + while r.events_txstopped.read().bits() == 0 {} + while r.events_rxto.read().bits() == 0 {} + + r.enable.write(|w| w.enable().disabled()); + + gpio::deconfigure_pin(r.psel.rxd.read().bits()); + gpio::deconfigure_pin(r.psel.txd.read().bits()); + gpio::deconfigure_pin(r.psel.rts.read().bits()); + gpio::deconfigure_pin(r.psel.cts.read().bits()); } } @@ -548,13 +550,3 @@ impl<'a, U: UarteInstance, T: TimerInstance> PeripheralState for StateInner<'a, trace!("irq: end"); } } - -/// Low power blocking wait loop using WFE/SEV. -fn low_power_wait_until(mut condition: impl FnMut() -> bool) { - while !condition() { - // WFE might "eat" an event that would have otherwise woken the executor. - cortex_m::asm::wfe(); - } - // Retrigger an event to be transparent to the executor. - cortex_m::asm::sev(); -}