66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
#![no_std]
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#![no_main]
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/// This example demonstrates how to access a given pin from more than one embassy task
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/// The on-board LED is toggled by two tasks with slightly different periods, leading to the
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/// apparent duty cycle of the LED increasing, then decreasing, linearly. The phenomenon is similar
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/// to interference and the 'beats' you can hear if you play two frequencies close to one another
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/// [Link explaining it](https://www.physicsclassroom.com/class/sound/Lesson-3/Interference-and-Beats)
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_rp::block::ImageDef;
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use embassy_rp::gpio;
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use embassy_sync::blocking_mutex::raw::ThreadModeRawMutex;
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use embassy_sync::channel::{Channel, Sender};
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use embassy_time::{Duration, Ticker};
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use gpio::{AnyPin, Level, Output};
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use {defmt_rtt as _, panic_probe as _};
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#[link_section = ".start_block"]
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#[used]
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pub static IMAGE_DEF: ImageDef = ImageDef::secure_exe();
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// Program metadata for `picotool info`
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#[link_section = ".bi_entries"]
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#[used]
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pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [
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embassy_rp::binary_info::rp_program_name!(c"example"),
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embassy_rp::binary_info::rp_cargo_version!(),
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embassy_rp::binary_info::rp_program_description!(c"Blinky"),
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embassy_rp::binary_info::rp_program_build_attribute!(),
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];
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enum LedState {
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Toggle,
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}
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static CHANNEL: Channel<ThreadModeRawMutex, LedState, 64> = Channel::new();
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#[embassy_executor::main]
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async fn main(spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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let mut led = Output::new(AnyPin::from(p.PIN_25), Level::High);
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let dt = 100 * 1_000_000;
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let k = 1.003;
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unwrap!(spawner.spawn(toggle_led(CHANNEL.sender(), Duration::from_nanos(dt))));
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unwrap!(spawner.spawn(toggle_led(
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CHANNEL.sender(),
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Duration::from_nanos((dt as f64 * k) as u64)
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)));
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loop {
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match CHANNEL.receive().await {
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LedState::Toggle => led.toggle(),
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}
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}
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}
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#[embassy_executor::task(pool_size = 2)]
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async fn toggle_led(control: Sender<'static, ThreadModeRawMutex, LedState, 64>, delay: Duration) {
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let mut ticker = Ticker::every(delay);
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loop {
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control.send(LedState::Toggle).await;
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ticker.next().await;
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}
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}
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