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This commit is contained in:
Grant Miller 2022-10-24 15:01:16 -05:00
parent 545cc9326b
commit 7a6732adcf
3 changed files with 16 additions and 12 deletions
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8
examples/stm32f1/src/bin/adc.rs
View file

@ -16,14 +16,14 @@ async fn main(_spawner: Spawner) {
let mut adc = Adc::new(p.ADC1, &mut Delay); let mut adc = Adc::new(p.ADC1, &mut Delay);
let mut pin = p.PB1; let mut pin = p.PB1;
let mut vref = adc.enable_vref(&mut Delay); let mut vrefint = adc.enable_vref(&mut Delay);
let vref_sample = adc.read(&mut vref); let vrefint_sample = adc.read(&mut vrefint);
let convert_to_millivolts = |sample| { let convert_to_millivolts = |sample| {
// From http://www.st.com/resource/en/datasheet/CD00161566.pdf // From http://www.st.com/resource/en/datasheet/CD00161566.pdf
// 5.3.4 Embedded reference voltage // 5.3.4 Embedded reference voltage
const VREF_MV: u32 = 1200; const VREFINT_MV: u32 = 1200; // mV
(u32::from(sample) * VREF_MV / u32::from(vref_sample)) as u16 (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
}; };
loop { loop {

12
examples/stm32f4/src/bin/adc.rs
View file

@ -24,14 +24,14 @@ async fn main(_spawner: Spawner) {
// Startup delay can be combined to the maximum of either // Startup delay can be combined to the maximum of either
delay.delay_us(Temperature::start_time_us().max(VrefInt::start_time_us())); delay.delay_us(Temperature::start_time_us().max(VrefInt::start_time_us()));
let vref_sample = adc.read_internal(&mut vrefint); let vrefint_sample = adc.read_internal(&mut vrefint);
let convert_to_millivolts = |sample| { let convert_to_millivolts = |sample| {
// From http://www.st.com/resource/en/datasheet/DM00071990.pdf // From http://www.st.com/resource/en/datasheet/DM00071990.pdf
// 6.3.24 Reference voltage // 6.3.24 Reference voltage
const VREF_MILLIVOLTS: u32 = 1210; // mV const VREFINT_MV: u32 = 1210; // mV
(u32::from(sample) * VREF_MILLIVOLTS / u32::from(vref_sample)) as u16 (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
}; };
let convert_to_celcius = |sample| { let convert_to_celcius = |sample| {
@ -45,6 +45,10 @@ async fn main(_spawner: Spawner) {
(sample_mv - V25) as f32 / AVG_SLOPE + 25.0 (sample_mv - V25) as f32 / AVG_SLOPE + 25.0
}; };
info!("VrefInt: {}", vrefint_sample);
const MAX_ADC_SAMPLE: u16 = (1 << 12) - 1;
info!("VCCA: {} mV", convert_to_millivolts(MAX_ADC_SAMPLE));
loop { loop {
// Read pin // Read pin
let v = adc.read(&mut pin); let v = adc.read(&mut pin);
@ -57,7 +61,7 @@ async fn main(_spawner: Spawner) {
// Read internal voltage reference // Read internal voltage reference
let v = adc.read_internal(&mut vrefint); let v = adc.read_internal(&mut vrefint);
info!("VrefInt: {} ({} mV)", v, convert_to_millivolts(v)); info!("VrefInt: {}", v);
Timer::after(Duration::from_millis(100)).await; Timer::after(Duration::from_millis(100)).await;
} }

8
examples/stm32f7/src/bin/adc.rs
View file

@ -16,14 +16,14 @@ async fn main(_spawner: Spawner) {
let mut adc = Adc::new(p.ADC1, &mut Delay); let mut adc = Adc::new(p.ADC1, &mut Delay);
let mut pin = p.PA3; let mut pin = p.PA3;
let mut vref = adc.enable_vrefint(); let mut vrefint = adc.enable_vrefint();
let vref_sample = adc.read_internal(&mut vref); let vrefint_sample = adc.read_internal(&mut vrefint);
let convert_to_millivolts = |sample| { let convert_to_millivolts = |sample| {
// From http://www.st.com/resource/en/datasheet/DM00273119.pdf // From http://www.st.com/resource/en/datasheet/DM00273119.pdf
// 6.3.27 Reference voltage // 6.3.27 Reference voltage
const VREF_MV: u32 = 1210; const VREFINT_MV: u32 = 1210; // mV
(u32::from(sample) * VREF_MV / u32::from(vref_sample)) as u16 (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16
}; };
loop { loop {