STM32F4xx位帶操作

1. #define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr
2. &0xFFFFF)<<5)+(bitnum<<2))
3. #define MEM_ADDR(addr) *((volatile unsigned long *)(addr))
4. #define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))
5. //F4XXIO 口地址映射
6. #define GPIOA_ODR_Addr (GPIOA_BASE+20) //0x40020014
7. #define GPIOB_ODR_Addr (GPIOB_BASE+20) //0x40020414
8. #define GPIOC_ODR_Addr (GPIOC_BASE+20) //0x40020814
9. #define GPIOD_ODR_Addr (GPIOD_BASE+20) //0x40020C14
10. #define GPIOE_ODR_Addr (GPIOE_BASE+20) //0x40021014
11. #define GPIOF_ODR_Addr (GPIOF_BASE+20) //0x40021414
12. #define GPIOG_ODR_Addr (GPIOG_BASE+20) //0x40021814
13. #define GPIOH_ODR_Addr (GPIOH_BASE+20) //0x40021C14
14. #define GPIOI_ODR_Addr (GPIOI_BASE+20) //0x40022014
15. #define GPIOA_IDR_Addr (GPIOA_BASE+16) //0x40020010
16. #define GPIOB_IDR_Addr (GPIOB_BASE+16) //0x40020410
17. #define GPIOC_IDR_Addr (GPIOC_BASE+16) //0x40020810
18. #define GPIOD_IDR_Addr (GPIOD_BASE+16) //0x40020C10
19. #define GPIOE_IDR_Addr (GPIOE_BASE+16) //0x40021010
20. #define GPIOF_IDR_Addr (GPIOF_BASE+16) //0x40021410
21. #define GPIOG_IDR_Addr (GPIOG_BASE+16) //0x40021810
22. #define GPIOH_IDR_Addr (GPIOF_BASE+16) //0x40021C10
23. #define GPIOI_IDR_Addr (GPIOG_BASE+16) //0x40022010
24. //F4XXIO 口操作,只對單一的IO 口,n 的值范圍[0-15]
25. #define GPIOAout(n) BIT_ADDR(GPIOA_ODR_Addr,n) //GPIOA 某一位輸出
26. #define GPIOAin(n) BIT_ADDR(GPIOA_IDR_Addr,n) //GPIOA 某一位輸入
27. #define GPIOBout(n) BIT_ADDR(GPIOB_ODR_Addr,n) //GPIOB 某一位輸出
28. #define GPIOBin(n) BIT_ADDR(GPIOB_IDR_Addr,n) //GPIOB 某一位輸入
29. #define GPIOCout(n) BIT_ADDR(GPIOC_ODR_Addr,n) //GPIOC 某一位輸出
30. #define GPIOCin(n) BIT_ADDR(GPIOC_IDR_Addr,n) //GPIOC 某一位輸入
31. #define GPIODout(n) BIT_ADDR(GPIOD_ODR_Addr,n) //GPIOD 某一位輸出
32. #define GPIODin(n) BIT_ADDR(GPIOD_IDR_Addr,n) //GPIOD 某一位輸入
33. #define GPIOEout(n) BIT_ADDR(GPIOE_ODR_Addr,n) //GPIOE 某一位輸出
34. #define GPIOEin(n) BIT_ADDR(GPIOE_IDR_Addr,n) //GPIOE 某一位輸入
35. #define GPIOFout(n) BIT_ADDR(GPIOF_ODR_Addr,n) //GPIOF 某一位輸出
36. #define GPIOFin(n) BIT_ADDR(GPIOF_IDR_Addr,n) //GPIOF 某一位輸入
37. #define GPIOGout(n) BIT_ADDR(GPIOG_ODR_Addr,n) //GPIOG 某一位輸出
38. #define GPIOGin(n) BIT_ADDR(GPIOG_IDR_Addr,n) //GPIOG 某一位輸入
39. #define GPIOHout(n) BIT_ADDR(GPIOH_ODR_Addr,n) //GPIOH 某一位輸出
40. #define GPIOHin(n) BIT_ADDR(GPIOH_IDR_Addr,n) //GPIOH 某一位輸入
41. #define GPIOIout(n) BIT_ADDR(GPIOI_ODR_Addr,n) //GPIOI 某一位輸出
42. #define GPIOIin(n) BIT_ADDR(GPIOI_IDR_Addr,n) //GPIOI 某一位輸入

這樣一來就可以實現位帶操作。

例如這樣：GPIOAout(0) = 0;

就完成了PA0端口輸出低電平了。有時用的時候會很方便。