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Merge pull request #1930 from xoviat/adc

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stm32/adc: make v1 async
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xoviat 2023-09-20 22:45:51 +00:00 committed by GitHub
commit 5626a28af2
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3 changed files with 104 additions and 63 deletions
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10
embassy-stm32/src/adc/mod.rs
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@ -31,15 +31,15 @@ pub struct Adc<'d, T: Instance> {
}
pub(crate) mod sealed {
#[cfg(adc_f3)]
#[cfg(any(adc_f3, adc_v1))]
use embassy_sync::waitqueue::AtomicWaker;
#[cfg(adc_f3)]
#[cfg(any(adc_f3, adc_v1))]
pub struct State {
pub waker: AtomicWaker,
}
#[cfg(adc_f3)]
#[cfg(any(adc_f3, adc_v1))]
impl State {
pub const fn new() -> Self {
Self {
@ -58,7 +58,7 @@ pub(crate) mod sealed {
fn common_regs() -> crate::pac::adccommon::AdcCommon;
#[cfg(adc_f3)]
fn frequency() -> crate::time::Hertz;
#[cfg(adc_f3)]
#[cfg(any(adc_f3, adc_v1))]
fn state() -> &'static State;
}
@ -96,7 +96,7 @@ foreach_adc!(
unsafe { crate::rcc::get_freqs() }.$clock.unwrap()
}
#[cfg(adc_f3)]
#[cfg(any(adc_f3, adc_v1))]
fn state() -> &'static sealed::State {
static STATE: sealed::State = sealed::State::new();
&STATE

145
embassy-stm32/src/adc/v1.rs
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@ -1,13 +1,35 @@
use core::future::poll_fn;
use core::marker::PhantomData;
use core::task::Poll;
use embassy_hal_internal::into_ref;
use embedded_hal_02::blocking::delay::DelayUs;
use crate::adc::{Adc, AdcPin, Instance, InternalChannel, Resolution, SampleTime};
use crate::interrupt::typelevel::Interrupt;
use crate::peripherals::ADC;
use crate::Peripheral;
use crate::{interrupt, Peripheral};
pub const VDDA_CALIB_MV: u32 = 3300;
pub const VREF_INT: u32 = 1230;
/// Interrupt handler.
pub struct InterruptHandler<T: Instance> {
_phantom: PhantomData<T>,
}
impl<T: Instance> interrupt::typelevel::Handler<T::Interrupt> for InterruptHandler<T> {
unsafe fn on_interrupt() {
if T::regs().isr().read().eoc() {
T::regs().ier().modify(|w| w.set_eocie(false));
} else {
return;
}
T::state().waker.wake();
}
}
pub struct Vbat;
impl InternalChannel<ADC> for Vbat {}
impl super::sealed::InternalChannel<ADC> for Vbat {
@ -33,7 +55,11 @@ impl super::sealed::InternalChannel<ADC> for Temperature {
}
impl<'d, T: Instance> Adc<'d, T> {
pub fn new(adc: impl Peripheral<P = T> + 'd, delay: &mut impl DelayUs<u32>) -> Self {
pub fn new(
adc: impl Peripheral<P = T> + 'd,
_irq: impl interrupt::typelevel::Binding<T::Interrupt, InterruptHandler<T>> + 'd,
delay: &mut impl DelayUs<u32>,
) -> Self {
into_ref!(adc);
T::enable();
T::reset();
@ -44,12 +70,32 @@ impl<'d, T: Instance> Adc<'d, T> {
// tstab = 14 * 1/fadc
delay.delay_us(1);
let s = Self {
// A.7.1 ADC calibration code example
T::regs().cfgr1().modify(|reg| reg.set_dmaen(false));
T::regs().cr().modify(|reg| reg.set_adcal(true));
while T::regs().cr().read().adcal() {}
// A.7.2 ADC enable sequence code example
if T::regs().isr().read().adrdy() {
T::regs().isr().modify(|reg| reg.set_adrdy(true));
}
T::regs().cr().modify(|reg| reg.set_aden(true));
while !T::regs().isr().read().adrdy() {
// ES0233, 2.4.3 ADEN bit cannot be set immediately after the ADC calibration
// Workaround: When the ADC calibration is complete (ADCAL = 0), keep setting the
// ADEN bit until the ADRDY flag goes high.
T::regs().cr().modify(|reg| reg.set_aden(true));
}
T::Interrupt::unpend();
unsafe {
T::Interrupt::enable();
}
Self {
adc,
sample_time: Default::default(),
};
s.calibrate();
s
}
}
pub fn enable_vbat(&self, _delay: &mut impl DelayUs<u32>) -> Vbat {
@ -80,21 +126,6 @@ impl<'d, T: Instance> Adc<'d, T> {
Temperature
}
fn calibrate(&self) {
// A.7.1 ADC calibration code example
if T::regs().cr().read().aden() {
T::regs().cr().modify(|reg| reg.set_addis(true));
}
while T::regs().cr().read().aden() {
// spin
}
T::regs().cfgr1().modify(|reg| reg.set_dmaen(false));
T::regs().cr().modify(|reg| reg.set_adcal(true));
while T::regs().cr().read().adcal() {
// spin
}
}
pub fn set_sample_time(&mut self, sample_time: SampleTime) {
self.sample_time = sample_time;
}
@ -103,57 +134,61 @@ impl<'d, T: Instance> Adc<'d, T> {
T::regs().cfgr1().modify(|reg| reg.set_res(resolution.into()));
}
pub fn read<P>(&mut self, pin: &mut P) -> u16
pub async fn read<P>(&mut self, pin: &mut P) -> u16
where
P: AdcPin<T> + crate::gpio::sealed::Pin,
{
let channel = pin.channel();
pin.set_as_analog();
self.read_channel(channel)
self.read_channel(channel).await
}
pub fn read_internal(&mut self, channel: &mut impl InternalChannel<T>) -> u16 {
pub async fn read_internal(&mut self, channel: &mut impl InternalChannel<T>) -> u16 {
let channel = channel.channel();
self.read_channel(channel)
self.read_channel(channel).await
}
fn read_channel(&mut self, channel: u8) -> u16 {
// A.7.2 ADC enable sequence code example
if T::regs().isr().read().adrdy() {
T::regs().isr().modify(|reg| reg.set_adrdy(true));
}
T::regs().cr().modify(|reg| reg.set_aden(true));
while !T::regs().isr().read().adrdy() {
// ES0233, 2.4.3 ADEN bit cannot be set immediately after the ADC calibration
// Workaround: When the ADC calibration is complete (ADCAL = 0), keep setting the
// ADEN bit until the ADRDY flag goes high.
T::regs().cr().modify(|reg| reg.set_aden(true));
}
async fn convert(&mut self) -> u16 {
T::regs().isr().modify(|reg| {
reg.set_eoc(true);
reg.set_eosmp(true);
});
T::regs().smpr().modify(|reg| reg.set_smp(self.sample_time.into()));
T::regs().ier().modify(|w| w.set_eocie(true));
T::regs().cr().modify(|reg| reg.set_adstart(true));
poll_fn(|cx| {
T::state().waker.register(cx.waker());
if T::regs().isr().read().eoc() {
Poll::Ready(())
} else {
Poll::Pending
}
})
.await;
T::regs().dr().read().data()
}
async fn read_channel(&mut self, channel: u8) -> u16 {
// A.7.5 Single conversion sequence code example - Software trigger
T::regs().chselr().write(|reg| reg.set_chselx(channel as usize, true));
T::regs().smpr().modify(|reg| reg.set_smp(self.sample_time.into()));
T::regs().cr().modify(|reg| reg.set_adstart(true));
while !T::regs().isr().read().eoc() {
// spin
}
let value = T::regs().dr().read().0 as u16;
// A.7.3 ADC disable code example
T::regs().cr().modify(|reg| reg.set_adstp(true));
while T::regs().cr().read().adstp() {
// spin
}
T::regs().cr().modify(|reg| reg.set_addis(true));
while T::regs().cr().read().aden() {
// spin
}
value
self.convert().await
}
}
impl<'d, T: Instance> Drop for Adc<'d, T> {
fn drop(&mut self) {
// A.7.3 ADC disable code example
T::regs().cr().modify(|reg| reg.set_adstp(true));
while T::regs().cr().read().adstp() {}
T::regs().cr().modify(|reg| reg.set_addis(true));
while T::regs().cr().read().aden() {}
T::disable();
}
}

12
examples/stm32f0/src/bin/adc.rs
View File

@ -5,20 +5,26 @@
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::adc::{Adc, SampleTime};
use embassy_stm32::peripherals::ADC;
use embassy_stm32::{adc, bind_interrupts};
use embassy_time::{Delay, Duration, Timer};
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs {
ADC1_COMP => adc::InterruptHandler<ADC>;
});
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
let p = embassy_stm32::init(Default::default());
info!("Hello World!");
let mut adc = Adc::new(p.ADC, &mut Delay);
let mut adc = Adc::new(p.ADC, Irqs, &mut Delay);
adc.set_sample_time(SampleTime::Cycles71_5);
let mut pin = p.PA1;
let mut vrefint = adc.enable_vref(&mut Delay);
let vrefint_sample = adc.read_internal(&mut vrefint);
let vrefint_sample = adc.read_internal(&mut vrefint).await;
let convert_to_millivolts = |sample| {
// From https://www.st.com/resource/en/datasheet/stm32f031c6.pdf
// 6.3.4 Embedded reference voltage
@ -28,7 +34,7 @@ async fn main(_spawner: Spawner) {
};
loop {
let v = adc.read(&mut pin);
let v = adc.read(&mut pin).await;
info!("--> {} - {} mV", v, convert_to_millivolts(v));
Timer::after(Duration::from_millis(100)).await;
}