嵌入式c語言調試開關的技巧

在調試程序時,經常會用到assert和printf之類的函數,我最近做的這個工程裏就有幾百個assert,在你自認爲程序已經沒有bug的時候,就要除去這些調試代碼,應爲系統在正常運行時這些用於調試的信息是無用的,而且會佔用時間和空間。怎麼刪除呢,以下僅供參考!

嵌入式c語言調試開關的技巧

下面給出最簡單的一種方法:

#define DEBUG

#ifdef DEBUG

#define PRINTF(x) printf x

#else

#define PRINTF(x) ((void)0)

#endif

使用時,PRINTF(( "Hello World!" ));

注意這裏是兩個括號,一個會報錯的'

不使用時,直接將"#define DEBUG"屏蔽掉

另外一個調試時常用的方法是assert,還是在一個頭文件裏,這裏用的是STM32函數庫的例子

#ifdef DEBUG 1

/************************************************************

* Macro Name : assert_param

* Description : The assert_param macro is used for function's parameters check.

* It is used only if the library is compiled in DEBUG mode.

* Input : - 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.

* Return : None

************************************************************/

#define assert_param(expr) ((expr) ? (void)0 : assert_failed((u8 *)__FILE__, __LINE__))

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

void assert_failed(u8* file, u32 line);

#else

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

#endif/* DEBUG */

//assert_failed此函數要自己定義

#ifdef DEBUG

/************************************************************

* Function Name : assert_failed

* Description : Reports the name of the source file and the source line number

* where the assert_param error has occurred.

* Input : - file: pointer to the source file name

* - line: assert_param error line source number

* Output : None

* Return : None

************************************************************/

void assert_failed(u8* file, u32 line)

{

/* User can add his own implementation to report the file name and line number,

ex: printf("Wrong parameters value: file %s on line %d", file, line) */

/* Infinite loop */

while (1){

}

}

#endif