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

#define gpio_led_pin GPIO_NUM_2
#define gpio_button_pin GPIO_NUM_13
#define ESP_INTR_FLAG_DEFAULT GPIO_INTR_DISABLE

static void button_handler(void *arg);

static void init_hw(void)
{
    gpio_config_t io_conf;

    io_conf.mode = GPIO_MODE_OUTPUT;
    io_conf.pin_bit_mask = gpio_led_pin;
    io_conf.intr_type = ESP_INTR_FLAG_DEFAULT;
    io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
    io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
    gpio_config(&io_conf);

    io_conf.mode = GPIO_MODE_INPUT;
    io_conf.pin_bit_mask = gpio_button_pin;
    io_conf.intr_type = GPIO_INTR_NEGEDGE;
    io_conf.pull_up_en = GPIO_PULLUP_ENABLE;
    gpio_config(&io_conf);

    gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
    gpio_isr_handler_add(gpio_button_pin, button_handler, NULL);
}
static TickType_t next = 0;
static bool led_state = false;

static void IRAM_ATTR button_handler(void *arg)
{
    TickType_t now = xTaskGetTickCountFromISR();
    if (now > next)
    {
        led_state = !led_state;
        gpio_set_level(gpio_led_pin, led_state);
        next = now + 500 / portTICK_PERIOD_MS;
    }
}

void app_main(void)
{
    init_hw();
    vTaskSuspend(NULL);
}