STM32F0xx的头文件USE_STDPERIPH_DRIVER宏的作用

#if !defined USE_STDPERIPH_DRIVER

/**

* [url=home.php?mod=space&uid=247401]@brief[/url] Comment the line below if you will not use the peripherals drivers.

In this case, these drivers will not be included and the application code will

be based on direct access to peripherals registers

*/

/*#define USE_STDPERIPH_DRIVER*/

#endif /* USE_STDPERIPH_DRIVER */

第二处是：



#ifdef USE_STDPERIPH_DRIVER

  #include "stm32f0xx_conf.h"

#endif

#include "stm32f0xx_adc.h"

#include "stm32f0xx_cec.h"

#include "stm32f0xx_crc.h"

……





/* Exported macro ------------------------------------------------------------*/

#ifdef  USE_FULL_ASSERT



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  The assert_param macro is used for function's parameters check.

  * @param  expr: If expr is false, it calls assert_failed function which reports

  *         the name of the source file and the source line number of the call

  *         that failed. If expr is true, it returns no value.

  * @retval None

  */

  #define assert_param(expr) ((expr) ? (void)0 : assert_failed((uint8_t *)__FILE__, __LINE__))

/* Exported functions ------------------------------------------------------- */

  void assert_failed(uint8_t* file, uint32_t line);

#else

  #define assert_param(expr) ((void)0)

#endif /* USE_FULL_ASSERT */