嵌入式 C语言 位操作 宏命令

位操作宏

#define _BV(n)              (1<<n)                           //1< n
#define BIT(n)              _BV(n)                           //1< n
#define BIT_SET(v,n)        do { v |= _BV(n); } while (0)    //第n位置1
#define BIT_CLR(v,n)        do { v &= ~_BV(n); } while (0)   //第n位置0
#define BIT_TOGGLE(v,n)     do { v ^= _BV(n); } while (0)    //第n位取反
#define BIT_GET(v,n)	    (v & _BV(n))                     //第n位保留
#define offset(type, member) (unsigned int)(&(((type *)0)->member)) //0到member的大小