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