// gpio_blinkled.rs - Blinks an LED in a loop.
//
// Remember to add a resistor of an appropriate value in series, to prevent
// exceeding the maximum current rating of the GPIO pin and the LED.
//
// Interrupting the process by pressing Ctrl-C causes the application to exit
// immediately without resetting the pin's state, so the LED might stay lit.
// Check out the gpio_blinkled_signals.rs example to learn how to properly
// handle incoming signals to prevent an abnormal termination.

use std::error::Error;
use std::thread;
use std::time::Duration;

use rppal::gpio::Gpio;

// Gpio uses BCM pin numbering. BCM GPIO 23 is tied to physical pin 16.
const GPIO_LED: u8 = 23;

fn main() -> Result<(), Box<dyn Error>> {
    // Retrieve the GPIO pin and configure it as an output.
    let mut pin = Gpio::new()?.get(GPIO_LED)?.into_output();

    loop {
        pin.toggle();
        thread::sleep(Duration::from_millis(500));
    }
}