1.C語言宏定義技巧(常用宏定義)

1,防止一個(gè)頭文件被重復(fù)包含

#ifndef COMDEF_H

#define COMDEF_H

//頭文件內(nèi)容

#endif

2,重新定義一些類型,防止由于各種平臺(tái)和編譯器的不同,而產(chǎn)生的類型字節(jié)數(shù)差異,方便移植.

typedef unsigned char boolean;



typedef unsigned long int uint32;

typedef unsigned short uint16;

typedef unsigned char uint8;



typedef signed long int int32;

typedef signed short int16;

typedef signed char int8;

2.AVR 軟件操作庫函數(shù)

uint8 dataElem[6];
void speaData(uint32 dat,sint8 len)
{
uint8 i;
uint32 j,y;
for(i=0,j=1;i{
y=dat/j;
dataElem[i]=y;
j*=10;
}
}

#define changeIntToHex(dec) ( ( ((dec)/10) <<4 ) + ((dec)) )

#define converseIntToHex(dec) ( ( ((dec)>>4) *10 ) + ((dec)) )

#define changeHexToInt(hex) ( ( ((hex)>>4) *10 ) + ((hex)) )

#define converseHexToInt(hex) ( ( ((hex)/10) <<4 ) + ((hex)) )

#endif

*--------------------------------------------------------------------

程序全稱：數(shù)據(jù)拆字程序
程序功能：
注意事項(xiàng)：D<=999999,C<=6
提示說明：調(diào)用speaData(12,2)，得到dataElem[0]=2，dataElem[1]=1
輸入：
返回：無
--------------------------------------------------------------------*/
uint8 dataElem[6];
void speaData(uint32 dat,sint8 len)
{
uint8 i;
uint32 j,y;
for(i=0,j=1;i{
y=dat/j;
dataElem[i]=y;
j*=10;
}
}

#define changeIntToHex(dec)( ( ((dec)/10) <<4 ) + ((dec)) )

#define converseIntToHex(dec)( ( ((dec)>>4) *10 ) + ((dec)) )

#define changeHexToInt(hex)( ( ((hex)>>4) *10 ) + ((hex)) )

#define converseHexToInt(hex)( ( ((hex)/10) <<4 ) + ((hex)) )

#endif