Module esp32_hal::rtc_cntl

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

§Overview

The rtc_cntl module provides a driver for the RTC_CNTL peripheral on ESP chips.

The Real-Time Clock Control (RTC_CNTL) peripheral is responsible for managing the real-time clock and low-power modes on the chip.

The rtc_cntl driver module contains functions and data structures to interact with the RTC_CNTL peripheral on ESP chips. 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
  • Real-Time Clock
  • Handling Watchdog Timers

§Examples

let mut delay = Delay::new(&clocks);

loop {
    esp_println::println!("rtc time in milliseconds is {}", rtc.get_time_ms());
    delay.delay_ms(1000u32);
}

§RTC Watchdog Timer

rtc.rwdt.start(2000u64.millis());
rtc.rwdt.listen();

interrupt::enable(
    peripherals::Interrupt::LP_WDT,
    interrupt::Priority::Priority1,
)
.unwrap();

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

unsafe {
    riscv::interrupt::enable();
}

loop {}

Where the LP_WDT interrupt handler is defined as:

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

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

        rwdt.clear_interrupt();

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

        rwdt.start(5000u64.millis());
        rwdt.unlisten();
    });
}

Modules§

  • sleep
    RTC Control Sleep Module

Structs§

Enums§

Functions§