#![no_std]
#![no_main]
use core::cell::RefCell;
use critical_section::Mutex;
use esp32_hal::{
clock::ClockControl,
interrupt,
peripherals::{self, Peripherals},
prelude::*,
Rtc,
};
use esp_backtrace as _;
static RTC: Mutex<RefCell<Option<Rtc>>> = Mutex::new(RefCell::new(None));
#[entry]
fn main() -> ! {
let peripherals = Peripherals::take();
let system = peripherals.SYSTEM.split();
let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
let mut rtc = Rtc::new(peripherals.LPWR);
rtc.rwdt.start(2000u64.millis());
rtc.rwdt.listen();
esp_println::println!(
"{: <10} XTAL frequency: {} MHz",
"[Expected]",
clocks.xtal_clock.to_MHz()
);
interrupt::enable(
peripherals::Interrupt::RTC_CORE,
interrupt::Priority::Priority1,
)
.unwrap();
critical_section::with(|cs| RTC.borrow_ref_mut(cs).replace(rtc));
loop {}
}
#[interrupt]
fn RTC_CORE() {
critical_section::with(|cs| {
let mut rtc = RTC.borrow_ref_mut(cs);
let rtc = rtc.as_mut().unwrap();
esp_println::println!(
"{: <10} XTAL frequency: {} MHz",
"[Monitor]",
rtc.estimate_xtal_frequency()
);
rtc.rwdt.clear_interrupt();
});
}