#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/gpio.h"

static xQueueHandle gpio_evt_queue = NULL;

static void IRAM_ATTR gpio_isr_handler(void* arg)
{
    uint32_t gpio_num = (uint32_t) arg;
    xQueueSendFromISR(gpio_evt_queue, &gpio_num, NULL);
}

static void gpio_task_example(void* arg) {
    uint32_t io_num;
    for(;;) {
        if(xQueueReceive(gpio_evt_queue, &io_num, portMAX_DELAY)) {
            printf("GPIO[%d] intr, val: %d\n", io_num, gpio_get_level(io_num));
        }
    }
}

void user_button_init() {
    gpio_config_t io_conf;

    io_conf.intr_type = GPIO_PIN_INTR_NEGEDGE;
    io_conf.mode = GPIO_MODE_INPUT;
    io_conf.pin_bit_mask = (1L << 0);
    io_conf.pull_down_en = 0;
    io_conf.pull_up_en = 0;

    gpio_config(&io_conf);

    gpio_evt_queue = xQueueCreate(10, sizeof(uint32_t));
    xTaskCreate(gpio_task_example, "gpio_task_example", 2048, NULL, 10, NULL);

    gpio_install_isr_service(0);
    gpio_isr_handler_add(0, gpio_isr_handler, (void*) 0);
}