61 lines
1.9 KiB
Rust
61 lines
1.9 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::unwrap;
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use embassy::blocking_mutex::raw::NoopRawMutex;
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use embassy::channel::mpsc::{self, Channel, Sender, TryRecvError};
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use embassy::executor::Spawner;
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use embassy::time::{Duration, Timer};
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use embassy::util::Forever;
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use embassy_nrf::gpio::{Level, Output, OutputDrive};
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use embassy_nrf::Peripherals;
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use defmt_rtt as _; // global logger
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use panic_probe as _;
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enum LedState {
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On,
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Off,
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}
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static CHANNEL: Forever<Channel<NoopRawMutex, LedState, 1>> = Forever::new();
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#[embassy::task(pool_size = 1)]
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async fn my_task(sender: Sender<'static, NoopRawMutex, LedState, 1>) {
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loop {
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let _ = sender.send(LedState::On).await;
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Timer::after(Duration::from_secs(1)).await;
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let _ = sender.send(LedState::Off).await;
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Timer::after(Duration::from_secs(1)).await;
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}
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}
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#[embassy::main]
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async fn main(spawner: Spawner, p: Peripherals) {
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let mut led = Output::new(p.P0_13, Level::Low, OutputDrive::Standard);
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let channel = CHANNEL.put(Channel::new());
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let (sender, mut receiver) = mpsc::split(channel);
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unwrap!(spawner.spawn(my_task(sender)));
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// We could just loop on `receiver.recv()` for simplicity. The code below
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// is optimized to drain the queue as fast as possible in the spirit of
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// handling events as fast as possible. This optimization is benign when in
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// thread mode, but can be useful when interrupts are sending messages
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// with the channel having been created via with_critical_sections.
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loop {
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let maybe_message = match receiver.try_recv() {
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m @ Ok(..) => m.ok(),
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Err(TryRecvError::Empty) => receiver.recv().await,
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Err(TryRecvError::Closed) => break,
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};
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match maybe_message {
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Some(LedState::On) => led.set_high(),
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Some(LedState::Off) => led.set_low(),
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_ => (),
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}
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}
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}
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