STM32的IO控制怎么用位带操作实现

可以直接通过下面的代码实现，以GPIOA为例

#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))
 
#define GPIOA_ODR_Addr (GPIOA_base+12) //0x4001080C

#define PAout(n) BIT_ADDR(GPIOA_ODR_Addrn) //输出
 
#define PAin(n) BIT_ADDR(GPIOA_IDR_Addrn) //输入