#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr&0xFFFFF)<<5)+(bitnum<<2))#define MEM_ADDR(addr) *((volatile unsigned long *)(addr))#define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))//F4XXIO 口地址映射#define GPIOA_ODR_Addr (GPIOA_BASE+20) //0x40020014#define GPIOB_ODR_Addr (GPIOB_BASE+20) //0x40020414#define GPIOC_ODR_Addr (GPIOC_BASE+20) //0x40020814#define GPIOD_ODR_Addr (GPIOD_BASE+20) //0x40020C14#define GPIOE_ODR_Addr (GPIOE_BASE+20) //0x40021014#define GPIOF_ODR_Addr (GPIOF_BASE+20) //0x40021414#define GPIOG_ODR_Addr (GPIOG_BASE+20) //0x40021814#define GPIOH_ODR_Addr (GPIOH_BASE+20) //0x40021C14#define GPIOI_ODR_Addr (GPIOI_BASE+20) //0x40022014#define GPIOA_IDR_Addr (GPIOA_BASE+16) //0x40020010#define GPIOB_IDR_Addr (GPIOB_BASE+16) //0x40020410#define GPIOC_IDR_Addr (GPIOC_BASE+16) //0x40020810#define GPIOD_IDR_Addr (GPIOD_BASE+16) //0x40020C10#define GPIOE_IDR_Addr (GPIOE_BASE+16) //0x40021010#define GPIOF_IDR_Addr (GPIOF_BASE+16) //0x40021410#define GPIOG_IDR_Addr (GPIOG_BASE+16) //0x40021810#define GPIOH_IDR_Addr (GPIOF_BASE+16) //0x40021C10#define GPIOI_IDR_Addr (GPIOG_BASE+16) //0x40022010//F4XXIO 口操作,只对单一的IO 口,n 的值范围[0-15]#define GPIOAout(n) BIT_ADDR(GPIOA_ODR_Addr,n) //GPIOA 某一位输出#define GPIOAin(n) BIT_ADDR(GPIOA_IDR_Addr,n) //GPIOA 某一位输入#define GPIOBout(n) BIT_ADDR(GPIOB_ODR_Addr,n) //GPIOB 某一位输出#define GPIOBin(n) BIT_ADDR(GPIOB_IDR_Addr,n) //GPIOB 某一位输入#define GPIOCout(n) BIT_ADDR(GPIOC_ODR_Addr,n) //GPIOC 某一位输出#define GPIOCin(n) BIT_ADDR(GPIOC_IDR_Addr,n) //GPIOC 某一位输入#define GPIODout(n) BIT_ADDR(GPIOD_ODR_Addr,n) //GPIOD 某一位输出#define GPIODin(n) BIT_ADDR(GPIOD_IDR_Addr,n) //GPIOD 某一位输入#define GPIOEout(n) BIT_ADDR(GPIOE_ODR_Addr,n) //GPIOE 某一位输出#define GPIOEin(n) BIT_ADDR(GPIOE_IDR_Addr,n) //GPIOE 某一位输入#define GPIOFout(n) BIT_ADDR(GPIOF_ODR_Addr,n) //GPIOF 某一位输出#define GPIOFin(n) BIT_ADDR(GPIOF_IDR_Addr,n) //GPIOF 某一位输入#define GPIOGout(n) BIT_ADDR(GPIOG_ODR_Addr,n) //GPIOG 某一位输出#define GPIOGin(n) BIT_ADDR(GPIOG_IDR_Addr,n) //GPIOG 某一位输入#define GPIOHout(n) BIT_ADDR(GPIOH_ODR_Addr,n) //GPIOH 某一位输出#define GPIOHin(n) BIT_ADDR(GPIOH_IDR_Addr,n) //GPIOH 某一位输入#define GPIOIout(n) BIT_ADDR(GPIOI_ODR_Addr,n) //GPIOI 某一位输出#define GPIOIin(n) BIT_ADDR(GPIOI_IDR_Addr,n) //GPIOI 某一位输入
这样一来就可以实现位带操作。
例如这样：GPIOAout(0) = 0;
就完成了PA0端口输出低电平了。有时用的时候会很方便。