#![no_std]
#![no_main]

// pick a panicking behavior
extern crate panic_halt; // you can put a breakpoint on `rust_begin_unwind` to catch panics
                         // extern crate panic_abort; // requires nightly
                         // extern crate panic_itm; // logs messages over ITM; requires ITM support
                         // extern crate panic_semihosting; // logs messages to the host stderr; requires a debugger

use metro_m0 as hal;

use hal::clock::GenericClockController;
use hal::delay::Delay;
use hal::entry;
use hal::pac::{CorePeripherals, Peripherals};
use hal::prelude::*;

#[entry]
fn main() -> ! {
    let mut peripherals = Peripherals::take().unwrap();
    let core = CorePeripherals::take().unwrap();
    let mut clocks = GenericClockController::with_external_32kosc(
        peripherals.GCLK,
        &mut peripherals.PM,
        &mut peripherals.SYSCTRL,
        &mut peripherals.NVMCTRL,
    );
    let mut pins = hal::Pins::new(peripherals.PORT);
    let mut red_led = pins.d13.into_push_pull_output(&mut pins.port);
    let switch = pins.d3.into_pull_down_input(&mut pins.port);

    let mut delay = Delay::new(core.SYST, &mut clocks);

    loop {
        // delay.delay_ms(255u8);
        if switch.is_high().unwrap() {
            red_led.set_high().unwrap();
        } else {
            red_led.set_low().unwrap();
        }
    }
}