#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

//Defining GPIO pins. (JI)
#define redLED 4
#define greenLED 5
#define blueLED 6
#define yellowLED 7

//Defining a constant, which is the number of elements in the 'leds' array. (JI)
#define NUM_LEDS 4

int leds[NUM_LEDS] = {redLED, greenLED, blueLED, yellowLED}; //Declaring an array with four elements, which represents each LED. (JI)

void app_main() {

//Initializing LEDs as outputs. (JI)
 for (int i = 0; i < NUM_LEDS; i++) {
        gpio_set_direction(leds[i], GPIO_MODE_OUTPUT);
    }

while (1) { //While loop runs endlessly, turning each LED on in sequential order for one second, and then turning the LED off before moving onto the next LED. (JI)
        // Turn on each LED sequentially
        for (int i = 0; i < NUM_LEDS; i++) {
            gpio_set_level(leds[i], 1);  //Runs through an index to turn the LEDs on one at a time. (JI)
            vTaskDelay(1000 / portTICK_PERIOD_MS);
            gpio_set_level(leds[i], 0);  //Runs through an index to turn the LEDs off one at a time. (JI)
        }

}

}