9261EK下的led驱动及测试函数

9261EK上led灯的简单驱动及测试-大聪

一、驱动函数如下：

#include

#include

#include

#include

#include

#include

#include

#include

#define NAME "four led test"

static int major =231;//定义主设备号

static unsigned long led_table [] = //定义不同的led控制引脚

{

    AT91_PIN_PA15,

    AT91_PIN_PA31,

    AT91_PIN_PA16,

    AT91_PIN_PA30,

   

};

 

static int myled_driver_ioctl(struct inode *inode,struct file *file,unsigned int cmd,unsigned long arg)

{

      unsigned int regled1;

 regled1=gpio_get_value(led_table[arg]);

 printk("led1 reg is : %d",regled1);

         at91_set_gpio_output(led_table[arg],1);

 

    switch(cmd)//控制led_table[arg]的亮灭

    {

        case    0x00:at91_set_gpio_value(led_table[arg],0);

    break;     

        case    0x01:gpio_set_value(led_table[arg],1);

    break;

        default:break;   

    }

    return 1;

}

static int myled_driver_open(struct inode *inode,struct file *file)

{

    unsigned m =iminor(inode);

    if(m>63) return -EINVAL;

    printk("led test driver opened!\n");

    return nonseekable_open(inode,file);

}

static int myled_driver_release(struct inode *inode,struct file *file)

{

    printk("my test driver released!\n");

    return 0;

}

static struct file_operations myled_driver_fops = 

{

    .owner =THIS_MODULE,

    .ioctl =myled_driver_ioctl,

    .open =myled_driver_open,

    .release =myled_driver_release,

};

static int __init myled_driver_init(void) //执行insmod的时候调用次函数

{

       int ret;   

       gpio_set_value(led_table[0],0);

       gpio_set_value(led_table[1],0);

       gpio_set_value(led_table[2],0);

       gpio_set_value(led_table[3],0);

       printk(KERN_ALERT "led modules is install\n");

         ret=register_chrdev(major,NAME,&myled_driver_fops);

        if(ret<0)

         {

              printk("unable to register myled driver!\n");

             return ret;

         }           

        return 0;

}

static void __exit myled_driver_exit(void)//执行rmmod的时候调用次函数

{

     

       unregister_chrdev(major,NAME);

      

}

module_init(myled_driver_init);

module_exit(myled_driver_exit);

MODULE_AUTHOR("lxs()");

MODULE_DESCRIPTION("this is test modules used to test at91sam9261 led");

MODULE_LICENSE("Dual BSD/GPL"); 

二、测试程序

次测试程序完成了一个简单的四个led的流水，每敲一次回车就流水一次，输入字符q退出流水。

#include

#include

#include

#include

 

#define IOCTL_LED_ON    0

#define IOCTL_LED_OFF   1

int delayLoopCount=1000;

void usage(char *exename)

{

    printf("Usage:\n");

    printf("    %s \n", exename); //  1 on 表示从灯1开始亮

    printf("    led_no = 1, 2, 3 or 4\n");  //led_on 表示从那个灯开始亮

}

void Delay(int time)

{

    int i;

    for(;time>0;time--)

        for(i=0;i

}

 

int main(int argc, char **argv)

{

    unsigned int led_no;

    int fd = -1;

    char w;

    if (argc != 3)

        goto err;

       

    fd = open("/dev/leds", 0);  // 打开设备

    if (fd < 0) {

        printf("Can't open /dev/leds\n");

        return -1;

    }

   

led_no = strtoul(argv[1], 0, 0) - 1;   //将字符型转换为整形

    if (led_no > 3)

        goto err;

   

    if (!strcmp(argv[2], "on"))

    {

   

    do

    {

        ioctl(fd, IOCTL_LED_ON, led_no);   //亮

        Delay(10000);

        ioctl(fd, IOCTL_LED_OFF, led_no);   //灭

        led_no++;

        ioctl(fd, IOCTL_LED_ON, led_no);   

        Delay(10000);

        ioctl(fd, IOCTL_LED_OFF, led_no);  

        led_no++;

        ioctl(fd, IOCTL_LED_ON, led_no);   

        Delay(10000);

        ioctl(fd, IOCTL_LED_OFF, led_no);  

        led_no++;

        ioctl(fd, IOCTL_LED_ON, led_no);  

        Delay(10000);

        ioctl(fd, IOCTL_LED_OFF, led_no); 

        printf("please enter any but q,when enter q ,quit the select\n");//输入的字符为

q则结束循环

        w=getchar();

        Delay(10000);

        led_no=0;

    }while('q'!=w);

  

    } else {

        goto err;

    }

   

    close(fd);

    return 0;

   

err:

    if (fd > 0)

        close(fd);

    usage(argv[0]);

    return -1;

}

 上面的程序很粗糙，大家多多指点！