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stm32/adc: Remove voltage and temperature conversions

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This commit is contained in:
Grant Miller
2022-10-23 16:31:10 -05:00
parent ce1cba761c
commit 545cc9326b
7 changed files with 45 additions and 103 deletions
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27
examples/stm32f4/src/bin/adc.rs
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@ -24,19 +24,40 @@ async fn main(_spawner: Spawner) {
// Startup delay can be combined to the maximum of either
delay.delay_us(Temperature::start_time_us().max(VrefInt::start_time_us()));
let vref_sample = adc.read_internal(&mut vrefint);
let convert_to_millivolts = |sample| {
// From http://www.st.com/resource/en/datasheet/DM00071990.pdf
// 6.3.24 Reference voltage
const VREF_MILLIVOLTS: u32 = 1210; // mV
(u32::from(sample) * VREF_MILLIVOLTS / u32::from(vref_sample)) as u16
};
let convert_to_celcius = |sample| {
// From http://www.st.com/resource/en/datasheet/DM00071990.pdf
// 6.3.22 Temperature sensor characteristics
const V25: i32 = 760; // mV
const AVG_SLOPE: f32 = 2.5; // mV/C
let sample_mv = convert_to_millivolts(sample) as i32;
(sample_mv - V25) as f32 / AVG_SLOPE + 25.0
};
loop {
// Read pin
let v = adc.read(&mut pin);
info!("PC1: {} ({} mV)", v, adc.to_millivolts(v));
info!("PC1: {} ({} mV)", v, convert_to_millivolts(v));
// Read internal temperature
let v = adc.read_internal(&mut temp);
let celcius = Temperature::to_celcius(adc.to_millivolts(v));
let celcius = convert_to_celcius(v);
info!("Internal temp: {} ({} C)", v, celcius);
// Read internal voltage reference
let v = adc.read_internal(&mut vrefint);
info!("VrefInt: {} ({} mV)", v, adc.to_millivolts(v));
info!("VrefInt: {} ({} mV)", v, convert_to_millivolts(v));
Timer::after(Duration::from_millis(100)).await;
}