embassy/embassy-nrf-examples/src/bin/ppi.rs

#![no_std]
#![no_main]
#![feature(min_type_alias_impl_trait)]
#![feature(impl_trait_in_bindings)]
#![feature(type_alias_impl_trait)]
#![allow(incomplete_features)]

#[path = "../example_common.rs"]
mod example_common;
use core::future::pending;

use example_common::*;

use cortex_m_rt::entry;
use defmt::panic;

use embassy::executor::{task, Executor};
use embassy::util::Forever;
use embassy_nrf::gpio::{Input, Level, Output, OutputDrive, Pull};
use embassy_nrf::gpiote::{self, InputChannel, InputChannelPolarity};
use embassy_nrf::ppi::Ppi;
use embassy_nrf::{interrupt, Peripherals};
use gpiote::{OutputChannel, OutputChannelPolarity};

#[task]
async fn run() {
    let p = Peripherals::take().unwrap();
    let g = gpiote::initialize(p.GPIOTE, interrupt::take!(GPIOTE));

    info!("Starting!");

    let button1 = InputChannel::new(
        g,
        p.GPIOTE_CH0,
        Input::new(p.P0_11, Pull::Up),
        InputChannelPolarity::HiToLo,
    );
    let button2 = InputChannel::new(
        g,
        p.GPIOTE_CH1,
        Input::new(p.P0_12, Pull::Up),
        InputChannelPolarity::HiToLo,
    );
    let button3 = InputChannel::new(
        g,
        p.GPIOTE_CH2,
        Input::new(p.P0_24, Pull::Up),
        InputChannelPolarity::HiToLo,
    );
    let button4 = InputChannel::new(
        g,
        p.GPIOTE_CH3,
        Input::new(p.P0_25, Pull::Up),
        InputChannelPolarity::HiToLo,
    );

    let led1 = OutputChannel::new(
        g,
        p.GPIOTE_CH4,
        Output::new(p.P0_13, Level::Low, OutputDrive::Standard),
        OutputChannelPolarity::Toggle,
    );

    let led2 = OutputChannel::new(
        g,
        p.GPIOTE_CH5,
        Output::new(p.P0_14, Level::Low, OutputDrive::Standard),
        OutputChannelPolarity::Toggle,
    );

    let mut ppi = Ppi::new(p.PPI_CH0);
    ppi.set_event(button1.event_in());
    ppi.set_task(led1.task_out());
    ppi.enable();

    let mut ppi = Ppi::new(p.PPI_CH1);
    ppi.set_event(button2.event_in());
    ppi.set_task(led1.task_clr());
    ppi.enable();

    let mut ppi = Ppi::new(p.PPI_CH2);
    ppi.set_event(button3.event_in());
    ppi.set_task(led1.task_set());
    ppi.enable();

    let mut ppi = Ppi::new(p.PPI_CH3);
    ppi.set_event(button4.event_in());
    ppi.set_task(led1.task_out());
    ppi.set_fork_task(led2.task_out());
    ppi.enable();

    info!("PPI setup!");
    info!("Press button 1 to toggle LED 1");
    info!("Press button 2 to turn on LED 1");
    info!("Press button 3 to turn off LED 1");
    info!("Press button 4 to toggle LEDs 1 and 2");
    // Block forever so the above drivers don't get dropped
    pending::<()>().await;
}

static EXECUTOR: Forever<Executor> = Forever::new();

#[entry]
fn main() -> ! {
    info!("Hello World!");

    let executor = EXECUTOR.put(Executor::new());
    executor.run(|spawner| {
        unwrap!(spawner.spawn(run()));
    });
}