From a0511e6caad8bbb4e41bed40283a92aaee7714bd Mon Sep 17 00:00:00 2001 From: Dario Nieuwenhuis Date: Mon, 22 Mar 2021 02:10:59 +0100 Subject: [PATCH] nrf/uart: make rts/cts optional. --- embassy-extras/src/macros.rs | 2 +- embassy-nrf-examples/src/bin/uart.rs | 4 +- embassy-nrf/src/uarte.rs | 98 +++++++--------------------- 3 files changed, 28 insertions(+), 76 deletions(-) diff --git a/embassy-extras/src/macros.rs b/embassy-extras/src/macros.rs index 5c50f5d96..22f93a1d3 100644 --- a/embassy-extras/src/macros.rs +++ b/embassy-extras/src/macros.rs @@ -78,7 +78,7 @@ macro_rules! peripherals { macro_rules! unborrow { ($($name:ident),*) => { $( - let $name = unsafe { $name.unborrow() }; + let mut $name = unsafe { $name.unborrow() }; )* } } diff --git a/embassy-nrf-examples/src/bin/uart.rs b/embassy-nrf-examples/src/bin/uart.rs index c39e70d53..7efb3ebe1 100644 --- a/embassy-nrf-examples/src/bin/uart.rs +++ b/embassy-nrf-examples/src/bin/uart.rs @@ -6,6 +6,7 @@ #[path = "../example_common.rs"] mod example_common; +use embassy_nrf::gpio::NoPin; use example_common::*; use cortex_m_rt::entry; @@ -29,8 +30,7 @@ async fn run() { config.baudrate = uarte::Baudrate::BAUD115200; let irq = interrupt::take!(UARTE0_UART0); - let uart = - unsafe { uarte::Uarte::new(p.uarte0, irq, p.p0_08, p.p0_06, p.p0_07, p.p0_05, config) }; + let uart = unsafe { uarte::Uarte::new(p.uarte0, irq, p.p0_08, p.p0_06, NoPin, NoPin, config) }; pin_mut!(uart); info!("uarte initialized!"); diff --git a/embassy-nrf/src/uarte.rs b/embassy-nrf/src/uarte.rs index fc57f406b..9a6e49907 100644 --- a/embassy-nrf/src/uarte.rs +++ b/embassy-nrf/src/uarte.rs @@ -1,8 +1,4 @@ -//! Async low power UARTE. -//! -//! The peripheral is automatically enabled and disabled as required to save power. -//! Lowest power consumption can only be guaranteed if the send receive futures -//! are dropped correctly (e.g. not using `mem::forget()`). +//! Async UART use core::future::Future; use core::marker::PhantomData; @@ -10,12 +6,13 @@ use core::pin::Pin; use core::sync::atomic::{compiler_fence, Ordering}; use core::task::Poll; use embassy::traits::uart::{Error, Read, Write}; -use embassy::util::{wake_on_interrupt, OnDrop, PeripheralBorrow, Signal}; +use embassy::util::{wake_on_interrupt, OnDrop, PeripheralBorrow}; use embassy_extras::unborrow; use futures::future::poll_fn; use crate::fmt::{assert, *}; -use crate::gpio::Pin as GpioPin; +use crate::gpio::sealed::Pin as _; +use crate::gpio::{OptionalPin as GpioOptionalPin, Pin as GpioPin}; use crate::hal::pac; use crate::hal::target_constants::EASY_DMA_SIZE; use crate::interrupt; @@ -62,8 +59,8 @@ impl<'d, T: Instance> Uarte<'d, T> { irq: impl PeripheralBorrow + 'd, rxd: impl PeripheralBorrow + 'd, txd: impl PeripheralBorrow + 'd, - cts: impl PeripheralBorrow + 'd, - rts: impl PeripheralBorrow + 'd, + cts: impl PeripheralBorrow + 'd, + rts: impl PeripheralBorrow + 'd, config: Config, ) -> Self { unborrow!(uarte, irq, rxd, txd, cts, rts); @@ -72,19 +69,23 @@ impl<'d, T: Instance> Uarte<'d, T> { assert!(r.enable.read().enable().is_disabled()); - // TODO OptionalPin for RTS/CTS. + rxd.conf().write(|w| w.input().connect().drive().h0h1()); + r.psel.rxd.write(|w| unsafe { w.bits(rxd.psel_bits()) }); txd.set_high(); - rts.set_high(); - rxd.conf().write(|w| w.input().connect().drive().h0h1()); txd.conf().write(|w| w.dir().output().drive().h0h1()); - //cts.conf().write(|w| w.input().connect().drive().h0h1()); - //rts.conf().write(|w| w.dir().output().drive().h0h1()); - - r.psel.rxd.write(|w| unsafe { w.bits(rxd.psel_bits()) }); r.psel.txd.write(|w| unsafe { w.bits(txd.psel_bits()) }); - //r.psel.cts.write(|w| unsafe { w.bits(cts.psel_bits()) }); - //r.psel.rts.write(|w| unsafe { w.bits(rts.psel_bits()) }); + + if let Some(pin) = rts.pin_mut() { + pin.set_high(); + pin.conf().write(|w| w.dir().output().drive().h0h1()); + } + r.psel.cts.write(|w| unsafe { w.bits(cts.psel_bits()) }); + + if let Some(pin) = cts.pin_mut() { + pin.conf().write(|w| w.input().connect().drive().h0h1()); + } + r.psel.rts.write(|w| unsafe { w.bits(rts.psel_bits()) }); r.baudrate.write(|w| w.baudrate().variant(config.baudrate)); r.config.write(|w| w.parity().variant(config.parity)); @@ -98,64 +99,15 @@ impl<'d, T: Instance> Uarte<'d, T> { phantom: PhantomData, } } +} - /* - unsafe fn on_irq(_ctx: *mut ()) { - let uarte = &*pac::UARTE0::ptr(); +impl<'d, T: Instance> Drop for Uarte<'d, T> { + fn drop(&mut self) { + let r = self.peri.regs(); + r.enable.write(|w| w.enable().disabled()); - let mut try_disable = false; - - if uarte.events_endtx.read().bits() != 0 { - uarte.events_endtx.reset(); - trace!("endtx"); - compiler_fence(Ordering::SeqCst); - - if uarte.events_txstarted.read().bits() != 0 { - // The ENDTX was signal triggered because DMA has finished. - uarte.events_txstarted.reset(); - try_disable = true; - } - - T::state().tx_done.signal(()); - } - - if uarte.events_txstopped.read().bits() != 0 { - uarte.events_txstopped.reset(); - trace!("txstopped"); - try_disable = true; - } - - if uarte.events_endrx.read().bits() != 0 { - uarte.events_endrx.reset(); - trace!("endrx"); - let len = uarte.rxd.amount.read().bits(); - compiler_fence(Ordering::SeqCst); - - if uarte.events_rxstarted.read().bits() != 0 { - // The ENDRX was signal triggered because DMA buffer is full. - uarte.events_rxstarted.reset(); - try_disable = true; - } - - T::state().rx_done.signal(len); - } - - if uarte.events_rxto.read().bits() != 0 { - uarte.events_rxto.reset(); - trace!("rxto"); - try_disable = true; - } - - // Disable the peripheral if not active. - if try_disable - && uarte.events_txstarted.read().bits() == 0 - && uarte.events_rxstarted.read().bits() == 0 - { - trace!("disable"); - uarte.enable.write(|w| w.enable().disabled()); - } + // todo disable pins } - */ } impl<'d, T: Instance> Read for Uarte<'d, T> {