#![no_std]
#![no_main]

use core::fmt::Write;

use esp32c3_hal::{clock::ClockControl, pac::Peripherals, prelude::*, RtcCntl, Serial, Timer};
use nb::block;
use panic_halt as _;
use riscv_rt::entry;

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take().unwrap();
    let system = peripherals.SYSTEM.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    let mut rtc_cntl = RtcCntl::new(peripherals.RTC_CNTL);
    let mut serial0 = Serial::new(peripherals.UART0);
    let mut timer0 = Timer::new(peripherals.TIMG0, clocks.apb_clock);
    let mut timer1 = Timer::new(peripherals.TIMG1, clocks.apb_clock);

    // Disable watchdog timers
    rtc_cntl.set_super_wdt_enable(false);
    rtc_cntl.set_wdt_enable(false);
    timer0.disable();
    timer1.disable();

    timer0.start(1u64.secs());

    loop {
        writeln!(serial0, "Hello world!").unwrap();
        block!(timer0.wait()).unwrap();
    }
}