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 /////////////////////////////////////////////////////////////////