90 lines
2.5 KiB
Rust
90 lines
2.5 KiB
Rust
//! Temperature sensor interface.
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use crate::interrupt;
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use crate::pac;
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use crate::peripherals::TEMP;
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use core::future::Future;
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use core::marker::PhantomData;
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use core::task::Poll;
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use embassy::interrupt::InterruptExt;
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use embassy::util::Unborrow;
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use embassy::waitqueue::AtomicWaker;
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use embassy_hal_common::{drop::OnDrop, unborrow};
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use fixed::types::I30F2;
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use futures::future::poll_fn;
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/// Integrated temperature sensor.
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pub struct Temp<'d> {
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_temp: PhantomData<&'d TEMP>,
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_irq: interrupt::TEMP,
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}
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static WAKER: AtomicWaker = AtomicWaker::new();
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impl<'d> Temp<'d> {
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pub fn new(
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_t: impl Unborrow<Target = TEMP> + 'd,
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irq: impl Unborrow<Target = interrupt::TEMP> + 'd,
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) -> Self {
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unborrow!(_t, irq);
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// Enable interrupt that signals temperature values
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irq.disable();
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irq.set_handler(|_| {
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let t = Self::regs();
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t.intenclr.write(|w| w.datardy().clear());
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WAKER.wake();
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});
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irq.enable();
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Self {
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_temp: PhantomData,
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_irq: irq,
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}
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}
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/// Perform an asynchronous temperature measurement. The returned future
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/// can be awaited to obtain the measurement.
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///
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/// If the future is dropped, the measurement is cancelled.
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///
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/// # Example
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///
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/// ```no_run
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/// let mut t = Temp::new(p.TEMP, interrupt::take!(TEMP));
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/// let v: u16 = t.read().await.to_num::<u16>();
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/// ```
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pub fn read(&mut self) -> impl Future<Output = I30F2> {
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// In case the future is dropped, stop the task and reset events.
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let on_drop = OnDrop::new(|| {
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let t = Self::regs();
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t.tasks_stop.write(|w| unsafe { w.bits(1) });
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t.events_datardy.reset();
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});
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let t = Self::regs();
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t.intenset.write(|w| w.datardy().set());
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unsafe { t.tasks_start.write(|w| w.bits(1)) };
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async move {
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let value = poll_fn(|cx| {
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WAKER.register(cx.waker());
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if t.events_datardy.read().bits() == 0 {
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return Poll::Pending;
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} else {
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t.events_datardy.reset();
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let raw = t.temp.read().bits();
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Poll::Ready(I30F2::from_bits(raw as i32))
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}
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})
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.await;
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on_drop.defuse();
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value
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}
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}
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fn regs() -> &'static pac::temp::RegisterBlock {
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unsafe { &*pac::TEMP::ptr() }
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}
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}
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