bit.h

在汇编中按位运算很多

#ifndef __bit_h__
#define __bit_h__
#define uchar unsigned char
#define uint  unsigned int
uchar bittest(uchar num,uchar mbit)
{ 
	if(num>>mbit&0x01==1)
	    return 1;
	else
	    return 0;
}
uchar bitclr(uchar num,uchar mbit) /*清除某一位*/
{
	uchar bit_value[]={1,2,4,8,16,32,64,128};
	return num&~bit_value[mbit];
}
uchar bitset(uchar num,uchar mbit) /*设置某一位*/
{
	uchar bit_value[]={1,2,4,8,16,32,64,128};
	return num|bit_value[mbit];
}
uchar bitcpl(uchar num,uchar mbit) /*取反某一位*/
{
	uchar bit_value[]={1,2,4,8,16,32,64,128};
	if(num>>mbit&0x01==1)
	     return num&~bit_value[mbit];
	else
	      return num|bit_value[mbit];
}
#endif