stm32 位带操作

摘自正点原子的例程代码,实现了对IO口的位带操作

 

 1 ///////////////////////////////////////////////////////////////
 2 //位带操作,实现51类似的GPIO控制功能
 3 //具体实现思想,参考<<CM3权威指南>>第五章(87页~92页).
 4 //IO口操作宏定义
 5 #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 
 6 #define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr)) 
 7 #define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum)) 
 8 //IO口地址映射
 9 #define GPIOA_ODR_Addr    (GPIOA_BASE+12) //0x4001080C 
10 #define GPIOB_ODR_Addr    (GPIOB_BASE+12) //0x40010C0C 
11 #define GPIOC_ODR_Addr    (GPIOC_BASE+12) //0x4001100C 
12 #define GPIOD_ODR_Addr    (GPIOD_BASE+12) //0x4001140C 
13 #define GPIOE_ODR_Addr    (GPIOE_BASE+12) //0x4001180C 
14 #define GPIOF_ODR_Addr    (GPIOF_BASE+12) //0x40011A0C    
15 #define GPIOG_ODR_Addr    (GPIOG_BASE+12) //0x40011E0C    
16 
17 #define GPIOA_IDR_Addr    (GPIOA_BASE+8) //0x40010808 
18 #define GPIOB_IDR_Addr    (GPIOB_BASE+8) //0x40010C08 
19 #define GPIOC_IDR_Addr    (GPIOC_BASE+8) //0x40011008 
20 #define GPIOD_IDR_Addr    (GPIOD_BASE+8) //0x40011408 
21 #define GPIOE_IDR_Addr    (GPIOE_BASE+8) //0x40011808 
22 #define GPIOF_IDR_Addr    (GPIOF_BASE+8) //0x40011A08 
23 #define GPIOG_IDR_Addr    (GPIOG_BASE+8) //0x40011E08 
24  
25 //IO口操作,只对单一的IO口!
26 //确保n的值小于16!
27 #define PAout(n)   BIT_ADDR(GPIOA_ODR_Addr,n)  //输出 
28 #define PAin(n)    BIT_ADDR(GPIOA_IDR_Addr,n)  //输入 
29 
30 #define PBout(n)   BIT_ADDR(GPIOB_ODR_Addr,n)  //输出 
31 #define PBin(n)    BIT_ADDR(GPIOB_IDR_Addr,n)  //输入 
32 
33 #define PCout(n)   BIT_ADDR(GPIOC_ODR_Addr,n)  //输出 
34 #define PCin(n)    BIT_ADDR(GPIOC_IDR_Addr,n)  //输入 
35 
36 #define PDout(n)   BIT_ADDR(GPIOD_ODR_Addr,n)  //输出 
37 #define PDin(n)    BIT_ADDR(GPIOD_IDR_Addr,n)  //输入 
38 
39 #define PEout(n)   BIT_ADDR(GPIOE_ODR_Addr,n)  //输出 
40 #define PEin(n)    BIT_ADDR(GPIOE_IDR_Addr,n)  //输入
41 
42 #define PFout(n)   BIT_ADDR(GPIOF_ODR_Addr,n)  //输出 
43 #define PFin(n)    BIT_ADDR(GPIOF_IDR_Addr,n)  //输入
44 
45 #define PGout(n)   BIT_ADDR(GPIOG_ODR_Addr,n)  //输出 
46 #define PGin(n)    BIT_ADDR(GPIOG_IDR_Addr,n)  //输入
47 /////////////////////////////////////////////////////////////////

 

posted @ 2012-10-12 11:37  sky1991  阅读(633)  评论(0编辑  收藏  举报