STM32简单的LED流水灯程序

//0x4002 1000 - 0x4002 13FF 复位和时钟控制(RCC)

#define RCC_BASE        0x40021000

#define RCC_APB2ENR        (RCC_BASE+0x18)

//LED接在GPIOF上，是APB2上的外设，是RCC_APB2ENR寄存器的第7位

//APB20x4001 1c00 GPIO端口F

#define GPIOF_BASE        0x40011c00

#define GPIOF_CHL        (0x000+GPIOF_BASE)

#define GPIOF_CHR        (0x004+GPIOF_BASE)

#define GPIOF_IDR        (0x008+GPIOF_BASE)

#define GPIOF_ODR         (0x00c+GPIOF_BASE)

#define GPIOF_BSRR         (0x010+GPIOF_BASE)

#define GPIOF_BRR        (0x014+GPIOF_BASE)

#define GPIOF_LCKR        (0x014+GPIOF_BASE)

void delay(int num)

{

    int i,j;

    for(i=0;i

        for(j=0;j<5000;j++)

            ;    

}

int main(void)

{

    *(unsigned int *)RCC_APB2ENR=1<<7;//开gpiof时钟

    //设置gpiof的管脚为开漏输出，电平为0，外部电流灌入6，7，8，9管脚

    //设置成开漏输出，频率无所谓，那么cny为0101,mode为0101

    *(unsigned int *)GPIOF_CHL=0x55555555;

    *((unsigned int *)GPIOF_CHR)=0x55555555;

    *((unsigned int *)GPIOF_ODR)=0xffff;

    while(1)

    {

        *((unsigned int *)GPIOF_BSRR)=1<<22;

        delay(200);

        *((unsigned int *)GPIOF_BSRR)=1<<23;

        delay(200);

        *((unsigned int *)GPIOF_BSRR)=1<<24;

        delay(200);

        *((unsigned int *)GPIOF_BSRR)=1<<25;

        delay(200);

        *((unsigned int *)GPIOF_ODR)=0xffff;

        delay(200);

    }    

}