1.C语言宏定义技巧(常用宏定义)

1,防止一个头文件被重复包含

#ifndef COMDEF_H

#define COMDEF_H

//头文件内容

#endif

2,重新定义一些类型,防止由于各种平台和编译器的不同,而产生的类型字节数差异,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 软件操作库函数

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

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

程序全称：数据拆字程序
程序功能：
注意事项：D<=999999,C<=6
提示说明：调用speaData(12,2)，得到dataElem[0]=2，dataElem[1]=1
输    入：
返    回：无
--------------------------------------------------------------------*/
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