#![no_std]
#![no_main]

use esp32s2_hal::{gpio::IO, pac::Peripherals, prelude::*, Delay, RtcCntl, Timer};
use panic_halt as _;
use xtensa_lx_rt::entry;

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take().unwrap();

    let mut timer0 = Timer::new(peripherals.TIMG0);
    let mut rtc_cntl = RtcCntl::new(peripherals.RTC_CNTL);

    // Disable MWDT and RWDT (Watchdog) flash boot protection
    timer0.disable();
    rtc_cntl.set_wdt_global_enable(false);

    // Set GPIO4 as an output, and set its state high initially.
    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
    let mut led = io.pins.gpio4.into_push_pull_output();

    led.set_high().unwrap();

    // Initialize the Delay peripheral, and use it to toggle the LED state in a
    // loop.
    let mut delay = Delay::new();

    loop {
        led.toggle().unwrap();
        delay.delay_ms(500u32);
    }
}