/* Interrupt Example
 
   This example code is in the Public Domain (or CC0 licensed, at your option.)
 
   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

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

#define LED_RED GPIO_NUM_2

#define BTN_RED GPIO_NUM_13

#define DELAY_TIME 200
 
volatile bool button_pressed = false;

static void gpio_isr_handler(void* arg) 
{
    button_pressed = true;
}

void button_config()
{
    gpio_install_isr_service(0);
    printf("configuring button\n");
    gpio_reset_pin(BTN_RED);
    gpio_set_direction(BTN_RED, GPIO_MODE_INPUT);
    gpio_pullup_en(BTN_RED);
    gpio_set_intr_type(BTN_RED, GPIO_INTR_POSEDGE);
    gpio_isr_handler_add(BTN_RED, gpio_isr_handler, NULL);
    printf("config complete\n");
}

void led_config()
{
    gpio_reset_pin(LED_RED);
    gpio_set_direction(LED_RED, GPIO_MODE_OUTPUT);
}

void app_main()
{   
    uint8_t led_value = 0;

    button_config();
    led_config();

    while (1) {
        if (button_pressed) {
            printf("*\n");
            button_pressed = false;
            led_value = !led_value;
            gpio_set_level(LED_RED, led_value);
        }
        vTaskDelay(DELAY_TIME / portTICK_PERIOD_MS);
    }
}