Timer interrupt TASK in ESP32 IDF using interrupts

I'm a beginner learning ESP32 using IDF and having a task to use interrupt timer. The task is to generate a signal using GPIO pin. The signal should be on for 20ms and off for 6ms. Here is the code that I've tried. I don't know where I'm going wrong and please guide me if my understanding is wrong.

#include <stdio.h>
#include "esp_timer.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/gpio.h"
#include <stdbool.h>
#include "esp_err.h"
#include "sdkconfig.h"
void timer_callback_1(void *param)
{ gpio_set_level(GPIO_NUM_2, 1);
}
void timer_callback_2(void *param)
{ gpio_set_level(GPIO_NUM_2, 0);
}
void app_main(void)
{ gpio_pad_select_gpio(GPIO_NUM_2); gpio_set_direction(GPIO_NUM_2, GPIO_MODE_OUTPUT); const esp_timer_create_args_t my_timer_args = { .callback = &timer_callback_1, .name = "a timer"}; esp_timer_handle_t timer_handler; ESP_ERROR_CHECK(esp_timer_create(&my_timer_args, &timer_handler)); ESP_ERROR_CHECK(esp_timer_start_periodic(timer_handler, 20000)); ESP_ERROR_CHECK(esp_timer_stop(timer_handler)); const esp_timer_create_args_t my_timer_args_2 = { .callback = &timer_callback_2, .name = "b timer"}; ESP_ERROR_CHECK(esp_timer_create(&my_timer_args_2, &timer_handler)); ESP_ERROR_CHECK(esp_timer_start_periodic(timer_handler, 6000)); ESP_ERROR_CHECK(esp_timer_stop(timer_handler)); //ESP_ERROR_CHECK(esp_timer_start_once(timer_handler, 20000)); while (true) { esp_timer_dump(stdout); vTaskDelay(pdMS_TO_TICKS(1000)); }
}

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