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嵌入式c語(yǔ)言調(diào)試開關(guān)的技巧
在調(diào)試程序時(shí),經(jīng)常會(huì)用到assert和printf之類的函數(shù),我最近做的這個(gè)工程里就有幾百個(gè)assert,在你自認(rèn)為程序已經(jīng)沒(méi)有bug的時(shí)候,就要除去這些調(diào)試代碼,應(yīng)為系統(tǒng)在正常運(yùn)行時(shí)這些用于調(diào)試的信息是無(wú)用的,而且會(huì)占用時(shí)間和空間。怎么刪除呢,以下僅供參考!
下面給出最簡(jiǎn)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(shí),PRINTF(( "Hello World! " ));
注意這里是兩個(gè)括號(hào),一個(gè)會(huì)報(bào)錯(cuò)的
不使用時(shí),直接將"#define DEBUG"屏蔽掉
另外一個(gè)調(diào)試時(shí)常用的方法是assert,還是在一個(gè)頭文件里,這里用的是STM32函數(shù)庫(kù)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(shù)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
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