STM32IO and timer mapping to address

Significance: Sometimes when we operate multiple STM32 IOs, the hardware design may not be regular, such as the output pins are: PB3, PC4, PC5, PD0, but the operations of these pins have commonalities, or we want to use for(it i = 0; i < 4; i++) to operate these pins like an array, the program will become very concise, then mapping IO to the address can achieve this goal.

method: 

1. //Bit-band operation to achieve GPIO control functions similar to 51

//For specific implementation ideas, refer to Chapter 5 (pages 87-92) of the "CM3 Authoritative Guide". M4 is similar to M3, except that the register address has changed.

//IO port operation macro definition

#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 

//IO port address mapping

#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    (GPIOH_BASE+16) //0x40021C10 

#define GPIOI_IDR_Addr    (GPIOI_BASE+16) //0x40022010 

2. Output: u32 val = BITBAND(GPIOB_ODR_Addr, 3); Print out val (input is: GPIOB_IDR_Addr)

PB3, PC4, PC5, PD0 correspond to: 0x4240828c, 0x42410290, 0x42410294, 0x42418280

3. Operation:

   uint32_t  PinTest[4] = {0x4240828c, 0x42410290, 0x42410294, 0x42418280};

   *((vu32 *)(PinTest[idx])) = 1;       *((vu32 *)(PinTest[idx])) = 0;

4. Input operation is similar

5. Timer related:

   u32 val =  (u32)&(TIM3->CCR3);     // TIM_Pluse

   u32 val =  (u32)&(TIM3->ARR);       // TIM_Period