text: /*
  * Copyright (c) 2006-2018, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
  * 2018-10-17     flybreak      the first version
  */
  
  #ifndef LED_H
  #define LED_H
  
  #define LED_PIN     21
  
  int led_init(void);                     //LED 灯初始化
  int led_on(void);                       //LED 灯亮
  int led_off(void);                      //LED 灯灭
  int led_toggle(void);                   //LED 灯亮灭状态翻转
  
  #endif
  