examples/stm32f1/src/bin/adc.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

#![no_std]
#![no_main]

use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::adc::{Adc, SampleTime};
use embassy_stm32::peripherals::ADC1;
use embassy_stm32::{adc, bind_interrupts};
use embassy_time::Timer;
use {defmt_rtt as _, panic_probe as _};

bind_interrupts!(struct Irqs {
    ADC1_2 => adc::InterruptHandler<ADC1>;
});

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_stm32::init(Default::default());
    info!("Hello World!");

    let mut adc = Adc::new(p.ADC1);
    let mut pin = p.PB1;

    let mut vrefint = adc.enable_vref();
    let vrefint_sample = adc.read(&mut vrefint, SampleTime::CYCLES13_5).await;
    let convert_to_millivolts = |sample| {
        // From http://www.st.com/resource/en/datasheet/CD00161566.pdf
        // 5.3.4 Embedded reference voltage
        const VREFINT_MV: u32 = 1200; // mV

        (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
    };

    loop {
        let v = adc.read(&mut pin, SampleTime::CYCLES13_5).await;
        info!("--> {} - {} mV", v, convert_to_millivolts(v));
        Timer::after_millis(100).await;
    }
}