diff --git a/examples/stm32l0/src/bin/adc.rs b/examples/stm32l0/src/bin/adc.rs new file mode 100644 index 000000000..93bf5adc6 --- /dev/null +++ b/examples/stm32l0/src/bin/adc.rs @@ -0,0 +1,46 @@ +#![no_std] +#![no_main] + +use defmt::*; +use embassy_stm32::Config; +use embassy_executor::Spawner; +use embassy_stm32::adc::{Adc, SampleTime}; +use embassy_stm32::peripherals::ADC; +use embassy_stm32::{adc, bind_interrupts}; +use embassy_time::{Delay, Timer}; +use {defmt_rtt as _, panic_probe as _}; + +bind_interrupts!(struct Irqs { + ADC1_COMP => adc::InterruptHandler; +}); + +#[embassy_executor::main] +async fn main(_spawner: Spawner) { + // enable HSI because default is MSI but ADC doesn't support + // this as clock source on L0s and uses HSI by default + let mut config = Config::default(); + config.rcc.hsi = true; + let p = embassy_stm32::init(config); + + info!("Hello World!"); + + let mut adc = Adc::new(p.ADC, Irqs, &mut Delay); + adc.set_sample_time(SampleTime::Cycles79_5); + let mut pin = p.PA1; + + let mut vrefint = adc.enable_vref(&mut Delay); + let vrefint_sample = adc.read(&mut vrefint).await; + let convert_to_millivolts = |sample| { + // From https://www.st.com/resource/en/datasheet/stm32l051c6.pdf + // 6.3.3 Embedded internal reference voltage + const VREFINT_MV: u32 = 1224; // mV + + (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16 + }; + + loop { + let v = adc.read(&mut pin).await; + info!("--> {} - {} mV", v, convert_to_millivolts(v)); + Timer::after_millis(100).await; + } +}