//! # GPIO 'Blinky' Example
//!
//! Blinks the LED on a Adafruit itsy-bitsy RP2040 board
//!
//! It may need to be adapted to your particular board layout and/or pin assignment.
//!
//! See the `Cargo.toml` file for Copyright and license details.

#![no_std]
#![no_main]

// The macro for our start-up function
use cortex_m_rt::entry;

// Ensure we halt the program on panic (if we don't mention this crate it won't
// be linked)
use panic_halt as _;

// Some traits we need
use embedded_hal::digital::v2::OutputPin;
use embedded_time::fixed_point::FixedPoint;

use adafruit_itsy_bitsy_rp2040::{
    hal::{
        clocks::{init_clocks_and_plls, Clock},
        pac,
        sio::Sio,
        watchdog::Watchdog,
    },
    Pins, XOSC_CRYSTAL_FREQ,
};

use cortex_m::delay::Delay;

/// Entry point to our bare-metal application.
///
/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
/// as soon as all global variables are initialised.
///
/// The function configures the RP2040 peripherals, then toggles a GPIO pin in
/// an infinite loop. If there is an LED connected to that pin, it will blink.
#[entry]
fn main() -> ! {
    // Grab our singleton objects
    let mut pac = pac::Peripherals::take().unwrap();
    let core = pac::CorePeripherals::take().unwrap();

    // Set up the watchdog driver - needed by the clock setup code
    let mut watchdog = Watchdog::new(pac.WATCHDOG);

    // Configure the clocks
    let clocks = init_clocks_and_plls(
        XOSC_CRYSTAL_FREQ,
        pac.XOSC,
        pac.CLOCKS,
        pac.PLL_SYS,
        pac.PLL_USB,
        &mut pac.RESETS,
        &mut watchdog,
    )
    .ok()
    .unwrap();

    let mut delay = Delay::new(core.SYST, clocks.system_clock.freq().integer());

    // The single-cycle I/O block controls our GPIO pins
    let sio = Sio::new(pac.SIO);

    let pins = Pins::new(
        pac.IO_BANK0,
        pac.PADS_BANK0,
        sio.gpio_bank0,
        &mut pac.RESETS,
    );
    let mut led_pin = pins.d13.into_push_pull_output();

    loop {
        led_pin.set_high().unwrap();
        delay.delay_ms(500);
        led_pin.set_low().unwrap();
        delay.delay_ms(500);
    }
}

// End of file