Module rtc_cntl 

Available on crate feature unstable only.

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_us() / 1000;
    delay.delay_millis(1000);

    // Set the time to half a second in the past
    let new_time = rtc.current_time_us() - 500_000;
    rtc.set_current_time_us(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, Duration::from_millis(2000));
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);
        if let Some(rwdt) = rwdt.as_mut() {
            rwdt.clear_interrupt();

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

            rwdt.set_timeout(RwdtStage::Stage0, Duration::from_millis(5000));
            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_us() * 1000;
    delay.delay_millis(1000);

    // Set the time to half a second in the past
    let new_time = rtc.current_time_us() - 500_000;
    rtc.set_current_time_us(new_time);
}

Modules

sleep

RTC Control Sleep Module

Structs

Rtc

Low-power Management

Rwdt

RTC Watchdog Timer.

Swd

Super Watchdog

Enums

RwdtStage

RWDT stages.

RwdtStageAction

Behavior of the RWDT stage if it times out.

SocResetReason

SOC Reset Reason.

Functions

reset_reason

Return reset reason.

wakeup_cause

Return wakeup reason.