mini2440裸机Led灯亮灭

 

代码如下：

#define rGPBCON (*(volatile unsigned long *) 0x56000010)
#define rGPBDAT (*(volatile unsigned long *) 0x56000014)
void Led_port_init(void);
#define LED1_ON ~(1<<5)
#define LED2_ON ~(1<<6)
#define LED3_ON ~(1<<7)
#define LED4_ON ~(1<<8)
#define LED1_OFF (1<<5)
#define LED2_OFF (1<<6)
#define LED3_OFF (1<<7)
#define LED4_OFF (1<<8)

void delay(int times)
{
    int i;
    for(;times>0;times--)
      for(i=0;i<400;i++);
}

int main(void)
{
    int i;
     Led_port_init();

    for(i=0;i<100;i++)
     {
     /* 全亮*/
     rGPBDAT = rGPBDAT&(LED1_ON)&(LED2_ON)&(LED3_ON)&(LED4_ON);

     delay(10000);

     /* 全灭*/
     rGPBDAT = rGPBDAT|(LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF);

     delay(10000);
     }
}

void Led_port_init(void)
{
   /*设置GPB5-GPB8为输出端口*/
    rGPBCON &= ~((3<<10)|(3<<12)|(3<<14)|(3<<16));
    rGPBCON |= (1<<10)|(1<<12)|(1<<14)|(1<<16);
}