esp32-hal 0.18.1

HAL for ESP32 microcontrollers
Documentation 
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//! Demonstrates deep sleep with timer wakeup

#![no_std]
#![no_main]

use core::time::Duration;

use esp32_hal::{
    clock::ClockControl,
    entry,
    peripherals::Peripherals,
    prelude::*,
    rtc_cntl::{get_reset_reason, get_wakeup_cause, sleep::TimerWakeupSource, SocResetReason},
    Cpu,
    Delay,
    Rtc,
};
use esp_backtrace as _;
use esp_println::println;

#[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);

    println!("up and runnning!");
    let reason = get_reset_reason(Cpu::ProCpu).unwrap_or(SocResetReason::ChipPowerOn);
    println!("reset reason: {:?}", reason);
    let wake_reason = get_wakeup_cause();
    println!("wake reason: {:?}", wake_reason);

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

    let timer = TimerWakeupSource::new(Duration::from_secs(30));
    println!("sleeping!");
    delay.delay_ms(100u32);
    rtc.sleep_deep(&[&timer], &mut delay);
}