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

#include <stddef.h>
#include "esp_intr_alloc.h"
#include "esp_attr.h"
#include "driver/timer.h"
#include "esp_timer.h"

/* Can run 'make menuconfig' to choose the GPIO to blink,
   or you can edit the following line and set a number here.
*/
#define BLINK_GPIO CONFIG_BLINK_GPIO

char state;

static void timer_func(void* arg)
{
    // your code, runs in the interrupt
    if (state) {
        state = 0;
        gpio_set_level(BLINK_GPIO, 1);
    } else {
        state = 1;
        gpio_set_level(BLINK_GPIO, 0);
    }
}

void init_timer(int timer_period_us)
{
    int64_t t_end;
    esp_timer_handle_t timer1;
    esp_timer_create_args_t args = {
            .callback = &timer_func,
            .arg = &t_end,
            .name = "timer1"
    };
    // ---
    gpio_pad_select_gpio(BLINK_GPIO);
    /* Set the GPIO as a push/pull output */
    gpio_set_direction(BLINK_GPIO, GPIO_MODE_OUTPUT);
    //----
    esp_timer_create(&args, &timer1);
    //ref_clock_init();
    esp_timer_start_periodic(timer1, timer_period_us);

    while(1) {
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
    esp_timer_delete(timer1);
}

void app_main()
{
    init_timer(10); // 10uS
}