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#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]
#[path = "../example_common.rs"]
mod example_common;
use example_common::*;
use core::mem::MaybeUninit;
use cortex_m_rt::entry;
use embassy_nrf::rtc;
use futures_intrusive::timer::{Clock, LocalTimer, LocalTimerService};
use nrf52840_hal::clocks;
use static_executor::{task, Executor};
struct RtcClock<T>(rtc::RTC<T>);
impl<T: rtc::Instance> Clock for RtcClock<T> {
fn now(&self) -> u64 {
self.0.now()
}
}
#[task]
async fn run1(rtc: &'static rtc::RTC<embassy_nrf::pac::RTC1>, timer: &'static LocalTimerService) {
loop {
info!("tick 1");
timer.deadline(rtc.now() + 64000).await;
}
}
#[task]
async fn run2(rtc: &'static rtc::RTC<embassy_nrf::pac::RTC1>, timer: &'static LocalTimerService) {
loop {
info!("tick 2");
timer.deadline(rtc.now() + 23000).await;
}
}
static EXECUTOR: Executor = Executor::new(cortex_m::asm::sev);
static mut RTC: MaybeUninit<RtcClock<embassy_nrf::pac::RTC1>> = MaybeUninit::uninit();
static mut TIMER: MaybeUninit<LocalTimerService> = MaybeUninit::uninit();
#[entry]
fn main() -> ! {
info!("Hello World!");
let p = embassy_nrf::pac::Peripherals::take().dewrap();
clocks::Clocks::new(p.CLOCK)
.enable_ext_hfosc()
.set_lfclk_src_external(clocks::LfOscConfiguration::NoExternalNoBypass)
.start_lfclk();
let rtc: &'static _ = unsafe {
let ptr = RTC.as_mut_ptr();
ptr.write(RtcClock(rtc::RTC::new(p.RTC1)));
&*ptr
};
rtc.0.start();
let timer: &'static _ = unsafe {
let ptr = TIMER.as_mut_ptr();
ptr.write(LocalTimerService::new(rtc));
&*ptr
};
unsafe {
EXECUTOR.spawn(run1(&rtc.0, timer)).dewrap();
EXECUTOR.spawn(run2(&rtc.0, timer)).dewrap();
loop {
timer.check_expirations();
EXECUTOR.run();
match timer.next_expiration() {
// If this is in the past, set_alarm will immediately trigger the alarm,
// which will make the wfe immediately return so we do another loop iteration.
Some(at) => rtc.0.set_alarm(at, cortex_m::asm::sev),
None => rtc.0.clear_alarm(),
}
cortex_m::asm::wfe();
}
}
}
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