AVR的位操作

1. #ifndef _M16_BIT_OPERATION_H_

#define _M16_BIT_OPERATION_H_
//定义一个带参的宏代替位域结构体方便使用
#define BITFIELD(addr) (*((volatile bit_field *)(addr)))
//位域定义结构体
typedef struct _bit_struct { unsigned Bit0:1; unsigned Bit1:1; unsigned Bit2:1; unsigned Bit3:1; unsigned Bit4:1; unsigned Bit5:1; unsigned Bit6:1; unsigned Bit7:1; }bit_field; 
2. #define PORTA_ADDR 0x3b 
3. #define PORT_PA0 ((*(volatile bit_field *)(PORTA_ADDR)).Bit0)
............ #endif 
二、方案二
typedef struct _bit_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 ; }bit_field; 
#define   GET_BITFIELD(addr)     (*((volatile bit_field *) (addr))) 
unsigned char bit_variable1;
#define led0 GET_BITFIELD(&bit_variable1).bit0 
#define led1 GET_BITFIELD(&bit_variable1).bit1 
#define led2 GET_BITFIELD(&bit_variable1).bit2
三、方案三
#define    GET_BITFIELD(addr)    (*((volatile bit_field *)(addr))) 
#define GETBIT(reg_name,n) GET_BITFIELD(®_name).bit##n 
#define led0 GETBIT(PORTD,0) 
#define led1 GETBIT(PORTD,1) 
#define led2 GETBIT(PORTD,2)