STM32F0xx的头文件USE_STDPERIPH_DRIVER宏的作

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ST公司提供STM32F0xx的头文件STM32F0xx.h，编译器都要定义一个宏：USE_STDPERIPH_DRIVER，如果不定义它 ----  照ST公司的做法，就会出现问题，如

实际上，打开头文件研究一下就知道，关系到这个宏的地方只有两处

第一处是：

1. #if !defined USE_STDPERIPH_DRIVER
   
2. /**
   
3. * [url=home.php?mod=space&uid=247401]@brief[/url] Comment the line below if you will not use the peripherals drivers.
   
4. In this case, these drivers will not be included and the application code will
   
5. be based on direct access to peripherals registers
   
6. */
   
7. /*#define USE_STDPERIPH_DRIVER*/
   
8. #endif /* USE_STDPERIPH_DRIVER */

第二处是：

1. 第二处是：
   
2. 
   
3. #ifdef USE_STDPERIPH_DRIVER
   
4.   #include "stm32f0xx_conf.h"
   
5. #endif
   

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而stm32f0xx_conf.h头文件的除了包含所有硬件资源的头文件外，还包含有一个宏定义：

1. #include "stm32f0xx_adc.h"
   
2. #include "stm32f0xx_cec.h"
   
3. #include "stm32f0xx_crc.h"
   
4. ……
   
5. 
   
6. 
   
7. /* Exported macro ------------------------------------------------------------*/
   
8. #ifdef  USE_FULL_ASSERT
   
9. 
   
10. /**
    
11.   * [url=home.php?mod=space&uid=247401]@brief[/url]  The assert_param macro is used for function's parameters check.
    
12.   * @param  expr: If expr is false, it calls assert_failed function which reports
    
13.   *         the name of the source file and the source line number of the call
    
14.   *         that failed. If expr is true, it returns no value.
    
15.   * @retval None
    
16.   */
    
17.   #define assert_param(expr) ((expr) ? (void)0 : assert_failed((uint8_t *)__FILE__, __LINE__))
    
18. /* Exported functions ------------------------------------------------------- */
    
19.   void assert_failed(uint8_t* file, uint32_t line);
    
20. #else
    
21.   #define assert_param(expr) ((void)0)
    
22. #endif /* USE_FULL_ASSERT */

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