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//! Builtin temperature sensor driver.
use core::future::poll_fn;
use core::task::Poll;
use embassy_hal_internal::drop::OnDrop;
use embassy_sync::waitqueue::AtomicWaker;
use fixed::types::I30F2;
use crate::interrupt::InterruptExt;
use crate::peripherals::TEMP;
use crate::{Peri, interrupt, pac};
/// Interrupt handler.
pub struct InterruptHandler {
_private: (),
}
impl interrupt::typelevel::Handler<interrupt::typelevel::TEMP> for InterruptHandler {
unsafe fn on_interrupt() {
let r = pac::TEMP;
r.intenclr().write(|w| w.set_datardy(true));
WAKER.wake();
}
}
/// Builtin temperature sensor driver.
pub struct Temp<'d> {
_peri: Peri<'d, TEMP>,
}
static WAKER: AtomicWaker = AtomicWaker::new();
impl<'d> Temp<'d> {
/// Create a new temperature sensor driver.
pub fn new(
_peri: Peri<'d, TEMP>,
_irq: impl interrupt::typelevel::Binding<interrupt::typelevel::TEMP, InterruptHandler> + 'd,
) -> Self {
// Enable interrupt that signals temperature values
interrupt::TEMP.unpend();
unsafe { interrupt::TEMP.enable() };
Self { _peri }
}
/// 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
/// use embassy_nrf::{bind_interrupts, temp};
/// use embassy_nrf::temp::Temp;
///
/// bind_interrupts!(struct Irqs {
/// TEMP => temp::InterruptHandler;
/// });
///
/// # async {
/// # let p: embassy_nrf::Peripherals = todo!();
/// let mut t = Temp::new(p.TEMP, Irqs);
/// 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_value(1);
t.events_datardy().write_value(0);
});
let t = Self::regs();
t.intenset().write(|w| w.set_datardy(true));
t.tasks_start().write_value(1);
let value = poll_fn(|cx| {
WAKER.register(cx.waker());
if t.events_datardy().read() == 0 {
Poll::Pending
} else {
t.events_datardy().write_value(0);
let raw = t.temp().read();
Poll::Ready(I30F2::from_bits(raw as i32))
}
})
.await;
on_drop.defuse();
value
}
fn regs() -> pac::temp::Temp {
pac::TEMP
}
}
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