stm32之7.位带操作---volatile---优化等级＋按键控制

源码---

#define PAin(n) (*(volatile uint32_t *)(0x42000000 + (GPIOA_BASE+0x10-0x40000000)*32 + (n)*4))

#define PEin(n) (*(volatile uint32_t *)(0x42000000 + (GPIOE_BASE+0x10-0x40000000)*32 + (n)*4))

#define PEout(n) (*(volatile uint32_t *)(0x42000000 + (GPIOE_BASE+0x14-0x40000000)*32 + (n)*4))

#define PFout(n) (*(volatile uint32_t *)(0x42000000 + (GPIOF_BASE+0x14-0x40000000)*32 + (n)*4))

int main(void)

{

key_init();

Led_init();

while(1){

if(PAin(0))

PFout(9)=0;

else

PFout(9)=1;

if(PEin(2))

PFout(10)=0;

else

PFout(10)=1;

}

}