#![deny(unsafe_code)]
#![no_std]
#![no_main]

extern crate panic_semihosting;

use cortex_m_rt::entry;
use embedded_hal::digital::v2::OutputPin;
use rtt_target::{rprintln, rtt_init_print};
use stm32f1xx_hal::{delay::Delay, pac, prelude::*};

#[entry]
fn main() -> ! {
    rtt_init_print!();

    // Get access to the core peripherals from the cortex-m crate
    let cp = cortex_m::Peripherals::take().unwrap();
    // Get access to the device specific peripherals from the peripheral access crate
    let dp = pac::Peripherals::take().unwrap();

    // Take ownership over the raw flash and rcc devices and convert them into the corresponding
    // HAL structs
    let mut flash = dp.FLASH.constrain();
    let mut rcc = dp.RCC.constrain();

    // Freeze the configuration of all the clocks in the system and store the frozen frequencies in
    // `clocks`
    let clocks = rcc.cfgr.freeze(&mut flash.acr);

    // Acquire the GPIOC peripheral
    let mut gpioc = dp.GPIOC.split(&mut rcc.apb2);

    // Configure gpio C pin 13 as a push-pull output. The `crh` register is passed to the function
    // in order to configure the port. For pins 0-7, crl should be passed instead.
    let mut led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);

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

    // Blink using the delay function
    loop {
        rprintln!("blink");
        led.set_high().unwrap();
        delay.delay_ms(1000u16);
        rprintln!("blonk");
        led.set_low().unwrap();
        delay.delay_ms(1000u16);
    }
}