#ifdef  USE_FULL_ASSERT

  #define assert_param(expr) ((expr) ? (void)0 : assert_failed((uint8_t *)__FILE__, __LINE__))  //这一句是什么意思


  void assert_failed(uint8_t* file, uint32_t line);
#else
  #define assert_param(expr) ((void)0)            //这一句在程序中有有什么用处

#endif

#endif