标题: 8bit位倒序函数 [打印本页]

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作者: wxg1988    时间: 2013-1-14 12:41     标题: 8bit位倒序函数

#include
union
{
struct
{
unsigned char bit0 : 1;
unsigned char bit1 : 1;
unsigned char bit2 : 1;
unsigned char bit3 : 1;
unsigned char bit4 : 1;
unsigned char bit5 : 1;
unsigned char bit6 : 1;
unsigned char bit7 : 1;
}bits;
unsigned char ucOne8Byte;
}uData8;
void DataChange(unsigned char *upByte)
{
unsigned char bTemp;
uData8.ucOne8Byte = *upByte;
bTemp = uData8.bits.bit0;
uData8.bits.bit0 = uData8.bits.bit7;
uData8.bits.bit7 = bTemp;

bTemp = uData8.bits.bit1;
uData8.bits.bit1 = uData8.bits.bit6;
uData8.bits.bit6 = bTemp;

bTemp = uData8.bits.bit2;
uData8.bits.bit2 = uData8.bits.bit5;
uData8.bits.bit5 = bTemp;

bTemp = uData8.bits.bit3;
uData8.bits.bit3 = uData8.bits.bit4;
uData8.bits.bit4 = bTemp;

*upByte = uData8.ucOne8Byte;
}
int main()
{
unsigned char a = 0xfe;
DataChange(&a);
printf("0x%x\n", a);
}

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