常用的几种码制转换

cpubbs

常用的几种码制转换
http://www.eebyte.com  2003-4-23  电子工程师网站
#include <reg51.h>
#include <intrins.h>
#include <stdio.h>
#include <ctype.h>

/**此宏定义摘自51bbs Youth发表***/
#define LongToBin(n) \
(\
((n >> 21) & 0x80) | \
((n >> 18) & 0x40) | \
((n >> 15) & 0x20) | \
((n >> 12) & 0x10) | \
((n >> 9) & 0x08) | \
((n >> 6) & 0x04) | \
((n >> 3) & 0x02) | \
((n ) & 0x01) \
)

#define Bin(n) LongToBin(0x##n##l)

/********** HEX转BCD******/
/***bcd_data(<0x255,>0)***/
unsigned char BCD2HEX(unsigned int bcd_data)
{
unsigned char temp;
temp=((bcd_data>>8)*100)|((bcd_data>>4)*10)|(bcd_data&0x0f);
return temp;
}
/********** HEX转BCD******/
/***hex_data(<0xff,>0)****/
unsigned int HEX2BCD(unsigned char hex_data)
{
unsigned int bcd_data;
unsigned char temp;
temp=hex_data%100;
bcd_data=((unsigned int)hex_data)/100<<8;
bcd_data=bcd_data|temp/10<<4;
bcd_data=bcd_data|temp%10;
return bcd_data;
}

void main(void)
{
unsigned int c;

c= Bin(10101001); // then c = 0xA9
c=BCD2HEX(0x255); //255 转成HEX为0xff
c=HEX2BCD(0xff); //0xff 转成BCD码为 255
}
-----afei