/**
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <stdio.h>
#include "pico/stdlib.h"

const uint LED_PINS[] = {2, 3, 4, 5, 6, 7, 8, 9};
const uint NUM_LEDS = sizeof(LED_PINS) / sizeof(LED_PINS[0]);

int main() 
{
    stdio_init_all();

    for (uint i = 0; i < NUM_LEDS; i++) {
        gpio_init(LED_PINS[i]);
        gpio_set_dir(LED_PINS[i], GPIO_OUT);
    }

    while (true) {
        for (uint i = 0; i < NUM_LEDS; i++) {
            gpio_put(LED_PINS[i], 1);
            sleep_ms(100);
            gpio_put(LED_PINS[i], 0);
        }
        
        for (int i = NUM_LEDS - 2; i > 0; i--) {
            gpio_put(LED_PINS[i], 1);
            sleep_ms(100);
            gpio_put(LED_PINS[i], 0);
        }
    }
    
    return 0;
}