将一个字节数据进行高低位镜像对调的实现函数

unsigned char swap (unsigned char pData)

{

unsigned char value=0,tmp=0;

unsigned char ii,jj;

for (ii=0x80,jj=0;ii!=0;ii=ii>>1,jj++)

{

if (pData & ii) tmp=1;

else tmp =0;

value |= tmp << jj;

}

return value;

}