esp_hal

Module rtc_cntl

Source
Available on crate feature unstable only.
Expand description

§Real-Time Control and Low-power Management (RTC_CNTL)

§Overview

The RTC_CNTL peripheral is responsible for managing the low-power modes on the chip.

§Configuration

It also includes the necessary configurations and constants for clock sources and low-power management. The driver provides the following features and functionalities:

  • Clock Configuration
  • Calibration
  • Low-Power Management
  • Handling Watchdog Timers

§Examples

§Get time in ms from the RTC Timer


let rtc = Rtc::new(peripherals.LPWR);
let delay = Delay::new();

loop {
    // Print the current RTC time in milliseconds
    let time_ms = rtc.current_time().and_utc().timestamp_millis();
    delay.delay_millis(1000);

    // Set the time to half a second in the past
    let new_time = rtc.current_time() - Duration::from_millis(500);
    rtc.set_current_time(new_time);
}

§RWDT usage

static RWDT: Mutex<RefCell<Option<Rwdt>>> = Mutex::new(RefCell::new(None));

let mut delay = Delay::new();
let mut rtc = Rtc::new(peripherals.LPWR);

rtc.set_interrupt_handler(interrupt_handler);
rtc.rwdt.set_timeout(RwdtStage::Stage0, 2000.millis());
rtc.rwdt.listen();

critical_section::with(|cs| RWDT.borrow_ref_mut(cs).replace(rtc.rwdt));

// Where the `LP_WDT` interrupt handler is defined as:
static RWDT: Mutex<RefCell<Option<Rwdt>>> = Mutex::new(RefCell::new(None));

// Handle the corresponding interrupt
#[handler]
fn interrupt_handler() {
    critical_section::with(|cs| {
        println!("RWDT Interrupt");

        let mut rwdt = RWDT.borrow_ref_mut(cs);
        let rwdt = rwdt.as_mut().unwrap();
        rwdt.clear_interrupt();

        println!("Restarting in 5 seconds...");

        rwdt.set_timeout(RwdtStage::Stage0, 5000u64.millis());
        rwdt.unlisten();
    });
}

§Get time in ms from the RTC Timer


let rtc = Rtc::new(peripherals.LPWR);
let delay = Delay::new();

loop {
    // Get the current RTC time in milliseconds
    let time_ms = rtc.current_time().and_utc().timestamp_millis();
    delay.delay_millis(1000);

    // Set the time to half a second in the past
    let new_time = rtc.current_time() - Duration::from_millis(500);
    rtc.set_current_time(new_time);
}

Modules§

  • sleep
    RTC Control Sleep Module

Structs§

Enums§

Functions§