///////////////////// Blinking and LEDs using ESP IDF with ESP32///////////////////////////  
/* 1) Understanding the gpio_reset_pin() function of the API  
   2) Understanding the gpio_set_direction() function of the API  
   3) Understanding the gpio_set_level() function of the API  
   4) gpio_get_level() function of the API  
   5) Create a template from gpio_config_t struct for GPIO common configuration. */  

//////////////==== The configuration parameters of GPIO pad for gpio_config_t struct ====/////////////  
//gpio_pin_bit_mask;  /* GPIO pin: set with bit mask, each bit maps to a GPIO */  
//gpio_mode_t    mode;      /* GPIO mode: set input/output mode */  
//gpio_pullup_t  pull_up_en; /* GPIO pull-up */  
//gpio_pulldown_t pull_down_en; /* GPIO pull-down */  
//gpio_int_type_t intr_type; /* GPIO interrupt type */  

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

#define LED1 GPIO_NUM_2  /* Define the GPIO2 as LED1 */  
#define LED2 GPIO_NUM_4  /* Define the GPIO4 as LED2 */  
#define LED3 GPIO_NUM_5  /* Define the GPIO5 as LED3 */  

/* Create a template from gpio_config_t struct for GPIO common configuration. */  
/* Name the struct template as GPIO_Config */  
gpio_config_t GPIO_Config;  

void app_main(void) {  
    /* Configure Digital I/O for LEDs */  
    GPIO_Config.pin_bit_mask = (1 << LED1) | (1 << LED2) | (1 << LED3);  /* set with bit mask, each bit maps to */  
    GPIO_Config.pull_down_en = GPIO_PULLDOWN_DISABLE;  /* pull-down ENABLE/DISABLE */  
    GPIO_Config.pull_up_en = GPIO_PULLUP_DISABLE;      /* pull-up ENABLE/DISABLE */  
    GPIO_Config.mode = GPIO_MODE_OUTPUT;               /* GPIO output type */  
    GPIO_Config.intr_type = GPIO_INTR_DISABLE;         /* interrupt type */  
    gpio_config(&GPIO_Config);                          /* Initialize GPIO */  
    
    while(1)  
  {  
    // turn the LEDs ON in one order  
    gpio_set_level(LED1, 1);  
    vTaskDelay(250 / portTICK_PERIOD_MS);  
    gpio_set_level(LED2, 1);  
    vTaskDelay(250 / portTICK_PERIOD_MS);  
    gpio_set_level(LED3, 1);  
    vTaskDelay(250 / portTICK_PERIOD_MS);  
    
    // turn OFF in the same order  
    gpio_set_level(LED1, 0);  
    vTaskDelay(250 / portTICK_PERIOD_MS);  
    gpio_set_level(LED2, 0);  
    vTaskDelay(250 / portTICK_PERIOD_MS);  
    gpio_set_level(LED3, 0);  
    vTaskDelay(250 / portTICK_PERIOD_MS);  
  }
}