embassy/examples/rp/src/bin/adc.rs

#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]

use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::adc::{Adc, Config, InterruptHandler, Pin};
use embassy_rp::bind_interrupts;
use embassy_rp::gpio::Pull;
use embassy_time::{Duration, Timer};
use {defmt_rtt as _, panic_probe as _};

bind_interrupts!(struct Irqs {
    ADC_IRQ_FIFO => InterruptHandler;
});

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_rp::init(Default::default());
    let mut adc = Adc::new(p.ADC, Irqs, Config::default());

    let mut p26 = Pin::new(p.PIN_26, Pull::None);
    let mut p27 = Pin::new(p.PIN_27, Pull::None);
    let mut p28 = Pin::new(p.PIN_28, Pull::None);

    loop {
        let level = adc.read(&mut p26).await.unwrap();
        info!("Pin 26 ADC: {}", level);
        let level = adc.read(&mut p27).await.unwrap();
        info!("Pin 27 ADC: {}", level);
        let level = adc.read(&mut p28).await.unwrap();
        info!("Pin 28 ADC: {}", level);
        let temp = adc.read_temperature().await.unwrap();
        info!("Temp: {} degrees", convert_to_celsius(temp));
        Timer::after(Duration::from_secs(1)).await;
    }
}

fn convert_to_celsius(raw_temp: u16) -> f32 {
    // According to chapter 4.9.5. Temperature Sensor in RP2040 datasheet
    27.0 - (raw_temp as f32 * 3.3 / 4096.0 - 0.706) / 0.001721 as f32
}