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Enables adc v4 averaging support.

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The Adc v4 peripheral includes a hardware oversampler.
This PR adds an averaging interface that keeps most of the current
interface backwards compatible while allowing for the common use-case
of hardware-averaging. A more comprehensive oversampler interface may
be exposed in the future.
This commit is contained in:
Alexandros Liarokapis 2024-06-23 12:43:24 +03:00
parent cfe8561550
commit 3883a5b2de
1 changed files with 38 additions and 0 deletions
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38
embassy-stm32/src/adc/v4.rs
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@ -126,6 +126,21 @@ impl Prescaler {
} }
} }
/// Number of samples used for averaging.
pub enum Averaging {
Disabled,
Samples2,
Samples4,
Samples8,
Samples16,
Samples32,
Samples64,
Samples128,
Samples256,
Samples512,
Samples1024,
}
impl<'d, T: Instance> Adc<'d, T> { impl<'d, T: Instance> Adc<'d, T> {
/// Create a new ADC driver. /// Create a new ADC driver.
pub fn new(adc: impl Peripheral<P = T> + 'd) -> Self { pub fn new(adc: impl Peripheral<P = T> + 'd) -> Self {
@ -252,6 +267,29 @@ impl<'d, T: Instance> Adc<'d, T> {
T::regs().cfgr().modify(|reg| reg.set_res(resolution.into())); T::regs().cfgr().modify(|reg| reg.set_res(resolution.into()));
} }
/// Set hardware averaging.
pub fn set_averaging(&mut self, averaging: Averaging) {
let (enable, samples, right_shift) = match averaging {
Averaging::Disabled => (false, 0, 0),
Averaging::Samples2 => (true, 1, 1),
Averaging::Samples4 => (true, 3, 2),
Averaging::Samples8 => (true, 7, 3),
Averaging::Samples16 => (true, 15, 4),
Averaging::Samples32 => (true, 31, 5),
Averaging::Samples64 => (true, 63, 6),
Averaging::Samples128 => (true, 127, 7),
Averaging::Samples256 => (true, 255, 8),
Averaging::Samples512 => (true, 511, 9),
Averaging::Samples1024 => (true, 1023, 10),
};
T::regs().cfgr2().modify(|reg| {
reg.set_rovse(enable);
reg.set_osvr(samples);
reg.set_ovss(right_shift);
})
}
/// Perform a single conversion. /// Perform a single conversion.
fn convert(&mut self) -> u16 { fn convert(&mut self) -> u16 {
T::regs().isr().modify(|reg| { T::regs().isr().modify(|reg| {