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use core::sync::atomic::{AtomicUsize, Ordering};
use log::trace;
use nrf52840_hal::{
clocks::LfOscStopped,
rtc::{self, RtcInterrupt},
Clocks, Rtc,
};
struct MilliClock(AtomicUsize);
impl MilliClock {
const fn new() -> Self {
Self(AtomicUsize::new(0))
}
#[allow(unused)]
fn set(&self, millis: usize) {
self.0.store(millis, Ordering::SeqCst)
}
#[allow(unused)]
fn add(&self, val: usize) -> usize {
self.0.fetch_add(val, Ordering::SeqCst)
}
// Slightly less than 1ms, due to using a 32,768Hz clock, we can't
// hit exactly 1ms, so we shoot for a bit under.
fn millis(&self) -> usize {
self.0.load(Ordering::SeqCst)
}
}
static CLOCK: MilliClock = MilliClock::new();
pub fn setup<R, H, L>(
mut rtc: Rtc<R, rtc::Stopped>,
clock: Clocks<H, L, LfOscStopped>,
) -> impl FnMut()
where
R: rtc::Instance,
{
trace!("setting up clock");
clock.set_lfclk_src_rc().start_lfclk();
// Try to set clock to 1kHz.
match rtc.set_prescaler(32) {
Ok(()) => trace!("set prescaler!"),
Err(x) => trace!("couldn't set prescaler: {:?}", x),
}
// Make sure event is cleared before start.
let _ = rtc.get_event_triggered(RtcInterrupt::Tick, true);
let mut rtc = rtc.enable_counter();
move || handler(&mut rtc)
}
pub fn millis() -> usize {
CLOCK.millis()
}
fn handler<R>(rtc: &mut Rtc<R, rtc::Started>)
where
R: rtc::Instance,
{
if rtc.get_event_triggered(RtcInterrupt::Tick, true) {
CLOCK.add(1);
log::logger().flush();
}
}
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