理论上的嵌入式跑马灯

跑马灯代码修改部分
驱动代码修改部分：

/* 功能：点亮第i个LED灯 参数：无符号整型变量iLed，表示第i个LED灯 返回值：无 */
void AllLedOn(int iLed)
{
    
	//读出端口M数据寄存器(S3C64XX_GPKDAT)值，修改并写回相关端口寄存器
	//add your code here 
	unsigned int tmp;
	tmp =readl(S3C64XX_GPMDAT);
	tmp &= ~(0X1<<iLed);
	printk("iLedOn---S3C64XX_GPMDAT=0X%0x\n",tmp);
	writel(tmp,S3C64XX_GPMDAT);	
}	
/* 功能：熄灭第i个LED灯 参数：无符号整型变量iLed，表示第i个LED灯 返回值：无 */
void AllLedOff(int iLed)
{
    
	//读出端口M数据寄存器(S3C64XX_GPKDAT)值，修改并写回相关端口寄存器
	//add your code here 
	unsigned int tmp;
	tmp =readl(S3C64XX_GPMDAT);
	tmp &= ~(0X1<<iLed);
	tmp |= (0X1<<iLed);
	printk("iLedOff---S3C64XX_GPMDAT=0X%0x\n",tmp);
	writel(tmp,S3C64XX_GPMDAT);
}

static long s3c6410_led_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
    
	int iLed;
	switch(cmd)
	{
    
		case ON:
			//开启LED跑马灯
			AllLedOn(0x0);
			for(iLed=0x1;iLed<6;iLed++){
    
				AllLedOff(iLed-1);
				AllLedOn(iLed);
				sleep(500);
			}
			break;
		case OFF:
			//熄灭LED跑马灯
			for(iLed=0x0;iLed<6;iLed++)
				AllLedOff(iLed);
			break;
	}
}

应用程序修改部分：

void main()
{
    
	int fd,iLed;
	fd=open("/dev/leddev" ,O_RDWR);
	if(fd<0)
		exit(1);
	while(1)
	{
    
		//点亮LED跑马灯
		ioctl(fd,	ON);
	}
	close (fd);

}

或者将ioctl和主函数代码修改成如下形式2：(ON和OFF的驱动代码不做修改)

static long s3c6410_led_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
    
	int iLed;
	switch(cmd)
	{
    
		case ON:
			//开启LED跑马灯
			AllLedOn(arg);
		case OFF:
				AllLedOff(arg);
			break;
	}
}

形式2对应应用程序：

void main()
{
    
	int fd,iLed;
	fd=open("/dev/leddev" ,O_RDWR);
	if(fd<0)
		exit(1);
	while(1)
	{
    
		//点亮LED跑马灯
		ioctl(fd,ON,0);
		for(int i=0;i<6;i++)
		{
    
			ioctl(fd,ON,i);
			ioctl(fd,OFF,i);
			sleep(5);
		}
	}
	close (fd);

}