6.4.c

来自「这是单片机C51典型应用设计代码」· C语言 代码 · 共 48 行

#include <reg51.h>
#include <intrins.h>
#include <stdio.h>
#include <ctype.h>

#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)

//BCD转HEX
//0<bcd_data<0x255
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
//0<bcd_data<0x255
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);                    // c = 0xA9
  c=BCD2HEX(0x255);                 //255 转成HEX为0xff
  c=HEX2BCD(0xff);                   //0xff 转成BCD码为 255
}