对unsigned char类型数据的指定位置0或置1操作

void bit_set(unsigned char *p_data,unsigned char position,int flag)
{
	int i = 0;
	if(1 == flag)
	{
		*p_data |= (1<<(position-1));
	}
	else if(0 == flag)
	{
		*p_data &= ~(1<<(position-1));
	}
}

p_data是要修改的数据，position是要指定的位，flag是0/1