#![no_main]
#![no_std]

extern crate panic_halt;

use cortex_m_rt::entry;
use hal::{pac, prelude::*, rcc::Config};

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

    // Configure the clock.
    let mut rcc = dp.RCC.freeze(Config::hsi16());

    let gpioa = dp.GPIOA.split(&mut rcc);
    let gpioc = dp.GPIOC.split(&mut rcc);

    // Configure PA5 as output.
    let mut led = gpioa.pa5.into_push_pull_output();
    let mut button = gpioc.pc13.into_pull_down_input();

    // Get the delay provider.
    let mut delay = cp.SYST.delay(rcc.clocks);

    loop {
        if button.is_low().expect("button.is_low failed") {
            led.set_high().unwrap();
        } else {
            led.set_low().unwrap();
        }

        delay.delay_ms(10_u16);
    }
}