ESP-IDF blink example

esp_idf_blink.c

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

#define GPIO_LED GPIO_NUM_13

static void init_hw(void) {
  gpio_config_t io_conf;
  io_conf.mode = GPIO_MODE_OUTPUT;
  io_conf.pin_bit_mask = (1ULL << GPIO_LED);
  io_conf.intr_type = GPIO_INTR_DISABLE;
  io_conf.pull_down_en = 0;
  io_conf.pull_up_en = 0;
  gpio_config(&io_conf);
}

void loop(void) {
  static int led_state = 0;
  led_state = !led_state;
  gpio_set_level(GPIO_LED, led_state);
  vTaskDelay(1000 / portTICK_PERIOD_MS);
}

void app_main() {
  init_hw();
  while (1) {
    loop();
  }
}