#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*转载请注明原文地址：http://blog.csdn.net/oyhb_1992/article/details/77745575*/
/*可伸缩定义，一个16位的变量分成2段保存数据/
/**** Definition of macros ****/
typedef unsigned short U16;
typedef unsigned char U8;
//定义LOW，HIGH各占几位保存
#define DV_LOW_SIZE 8
#define DV_HIGH_SIZE (16 - DV_LOW_SIZE) //=8
//高8位保存HIGH，低8位保存LOW
#define DV_LOW_MASK ((1<<DV_LOW_SIZE)-1) //其实就是00FF
#define DV_HIGH_MASK (~DV_LOW_MASK) //FF00
//设置
static void dv_set(U16 *temp,U16 value)
{
*temp = value;
}
void dv_set_LOW(U16 *temp,U8 LOW)
{
*temp=(*temp &DV_HIGH_MASK) | (((U16)LOW)&DV_LOW_MASK);
} //先清零低8位再设置低8位
void dv_set_HIGH(U16 *temp,U8 HIGH)
{
*temp=(*temp &DV_LOW_MASK) | (((U16)HIGH)<<DV_LOW_SIZE);
}
//获取
U8 dv_get_LOW(U16 *temp)
{
return (*temp &DV_LOW_MASK);
}
U8 dv_get_HIGH(U16 *temp)
{
return (*temp >>DV_LOW_SIZE);
}
// 十进制转换为二进制，十进制数的每1bit转换为二进制的1位数字
char *int_to_bin(unsigned short data)
{
unsigned int i = 0;
int bit_num = sizeof(unsigned short) * 8;
char *p_bin = (char*)malloc(sizeof(char)*(bit_num+1));
//char *p_bin = new char[bit_num+1];
p_bin[bit_num] = '\0';
printf("bit_num = %d\n",bit_num);
for (i = 0; i < bit_num; ++i)
{
//p_bin[i] = data << i >> (bit_num-1);//获取第i位
//p_bin[i] = data>> (bit_num-1);
p_bin[i] = data&(1<<i);//等价于上面两条语句
if (p_bin[i] == 0)
p_bin[i] = '0';
else if (p_bin[i] != 0)
p_bin[i] = '1';
/*printf("bit_num = %c\n",p_bin[i]);
printf("1<<i = %d\n",1<<i);*/
}
return p_bin;
}
int main()
{
U16 temp;U16 TEST = 65535;
dv_set(&temp,0);
dv_set_HIGH(&temp,3);
printf("temp = %s\n",int_to_bin(temp));
dv_set_LOW(&temp,7);
printf("temp = %s\n",int_to_bin(temp));
printf("temp = %d\n",temp);
printf("sizeof(unsigned short) = %d\n",sizeof(unsigned short));
printf("TEST = %s\n",int_to_bin(TEST));
return 1;
}
