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Improve ADC configuration options

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This commit is contained in:
chemicstry
2022-07-27 01:17:26 +03:00
parent 84cffc751a
commit 046778fc53
4 changed files with 68 additions and 34 deletions
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28
embassy-stm32/src/adc/v4.rs
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@@ -9,6 +9,11 @@ use super::{AdcPin, Instance};
use crate::time::Hertz;
use crate::{pac, Peripheral};
/// Default VREF voltage used for sample conversion to millivolts.
pub const VREF_DEFAULT_MV: u32 = 3300;
/// VREF voltage used for factory calibration of VREFINTCAL register.
pub const VREF_CALIB_MV: u32 = 3300;
pub enum Resolution {
SixteenBit,
FourteenBit,
@@ -53,10 +58,10 @@ mod sealed {
}
}
// NOTE: Vref/Temperature/Vbat are only available on ADC3 on H7, this currently cannot be modeled with stm32-data, so these are available from the software on all ADCs
pub struct Vref;
impl<T: Instance> InternalChannel<T> for Vref {}
impl<T: Instance> sealed::InternalChannel<T> for Vref {
// NOTE: Vrefint/Temperature/Vbat are only available on ADC3 on H7, this currently cannot be modeled with stm32-data, so these are available from the software on all ADCs
pub struct VrefInt;
impl<T: Instance> InternalChannel<T> for VrefInt {}
impl<T: Instance> sealed::InternalChannel<T> for VrefInt {
fn channel(&self) -> u8 {
19
}
@@ -317,6 +322,7 @@ impl Prescaler {
pub struct Adc<'d, T: Instance> {
sample_time: SampleTime,
vref: u32,
resolution: Resolution,
phantom: PhantomData<&'d mut T>,
}
@@ -354,6 +360,7 @@ impl<'d, T: Instance + crate::rcc::RccPeripheral> Adc<'d, T> {
let mut s = Self {
sample_time: Default::default(),
vref: VREF_DEFAULT_MV,
resolution: Resolution::default(),
phantom: PhantomData,
};
@@ -422,14 +429,14 @@ impl<'d, T: Instance + crate::rcc::RccPeripheral> Adc<'d, T> {
}
}
pub fn enable_vref(&self) -> Vref {
pub fn enable_vrefint(&self) -> VrefInt {
unsafe {
T::common_regs().ccr().modify(|reg| {
reg.set_vrefen(true);
});
}
Vref {}
VrefInt {}
}
pub fn enable_temperature(&self) -> Temperature {
@@ -460,9 +467,16 @@ impl<'d, T: Instance + crate::rcc::RccPeripheral> Adc<'d, T> {
self.resolution = resolution;
}
/// Set VREF used for [to_millivolts()] conversion.
///
/// Use this if you have a known precise VREF (VDDA) pin reference voltage.
pub fn set_vref(&mut self, vref: u32) {
self.vref = vref;
}
/// Convert a measurement to millivolts
pub fn to_millivolts(&self, sample: u16) -> u16 {
((u32::from(sample) * 3300) / self.resolution.to_max_count()) as u16
((u32::from(sample) * self.vref) / self.resolution.to_max_count()) as u16
}
/// Perform a single conversion.