69 lines
2.1 KiB
Rust
69 lines
2.1 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use cortex_m::prelude::_embedded_hal_blocking_delay_DelayUs;
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::adc::{Adc, Temperature, VrefInt};
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use embassy_time::{Delay, Duration, Timer};
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_stm32::init(Default::default());
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info!("Hello World!");
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let mut delay = Delay;
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let mut adc = Adc::new(p.ADC1, &mut delay);
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let mut pin = p.PC1;
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let mut vrefint = adc.enable_vrefint();
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let mut temp = adc.enable_temperature();
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// Startup delay can be combined to the maximum of either
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delay.delay_us(Temperature::start_time_us().max(VrefInt::start_time_us()));
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let vrefint_sample = adc.read_internal(&mut vrefint);
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let convert_to_millivolts = |sample| {
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// From http://www.st.com/resource/en/datasheet/DM00071990.pdf
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// 6.3.24 Reference voltage
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const VREFINT_MV: u32 = 1210; // mV
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(u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
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};
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let convert_to_celcius = |sample| {
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// From http://www.st.com/resource/en/datasheet/DM00071990.pdf
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// 6.3.22 Temperature sensor characteristics
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const V25: i32 = 760; // mV
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const AVG_SLOPE: f32 = 2.5; // mV/C
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let sample_mv = convert_to_millivolts(sample) as i32;
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(sample_mv - V25) as f32 / AVG_SLOPE + 25.0
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};
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info!("VrefInt: {}", vrefint_sample);
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const MAX_ADC_SAMPLE: u16 = (1 << 12) - 1;
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info!("VCCA: {} mV", convert_to_millivolts(MAX_ADC_SAMPLE));
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loop {
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// Read pin
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let v = adc.read(&mut pin);
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info!("PC1: {} ({} mV)", v, convert_to_millivolts(v));
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// Read internal temperature
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let v = adc.read_internal(&mut temp);
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let celcius = convert_to_celcius(v);
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info!("Internal temp: {} ({} C)", v, celcius);
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// Read internal voltage reference
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let v = adc.read_internal(&mut vrefint);
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info!("VrefInt: {}", v);
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Timer::after(Duration::from_millis(100)).await;
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}
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}
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