一.驱动程序代码：

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define DEVICE_NAME "leds"

#define LED_MAJOR 231

static unsigned long led_table [] = {

S3C2410_GPF4,

S3C2410_GPF5,

S3C2410_GPF6,

S3C2410_GPF7,

};

static unsigned int led_cfg_table [] = {

S3C2410_GPF4_OUTP,

S3C2410_GPF5_OUTP,

S3C2410_GPF6_OUTP,

S3C2410_GPF7_OUTP,

};

static int s3c2440_leds_ioctl(

struct inode *inode,

struct file *file,

unsigned int cmd,

unsigned long arg)

{

switch(cmd)

{

case 0:

case 1:

if (arg > 4)

{

return -EINVAL;

}

s3c2410_gpio_setpin(led_table[arg], !cmd);

return 0;

default:

return -EINVAL;

}

}

static struct file_operations s3c2440_leds_fops = {

.owner = THIS_MODULE,

.ioctl = s3c2440_leds_ioctl,

};

static int __init s3c2440_leds_init(void)

{

int ret;

int i;

ret = register_chrdev(LED_MAJOR, DEVICE_NAME, &s3c2440_leds_fops);

if (ret < 0)

{

printk(DEVICE_NAME " can't register major number\n");

return ret;

}

devfs_mk_cdev(MKDEV(LED_MAJOR, 0), S_IFCHR | S_IRUSR | S_IWUSR |

S_IRGRP,DEVICE_NAME);

for (i = 0; i < 4; i++)

{

s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]);

s3c2410_gpio_setpin(led_table[i], 1);

}

printk(DEVICE_NAME " initialized\n");

return 0;

}

static void __exit s3c2440_leds_exit(void)

{

devfs_remove(DEVICE_NAME);

unregister_chrdev(LED_MAJOR, DEVICE_NAME);

}

module_init(s3c2440_leds_init);

module_exit(s3c2440_leds_exit);

编译的方式参考：“如何在Linux下添加自己驱动”一文。

二.应用程序测试代码：

#include

#include

#include

#include "stdio.h"

#include "sys/types.h"

#include "sys/ioctl.h"

#include "stdlib.h"

#include "termios.h"

#include "sys/stat.h"

#include "fcntl.h"

#include "sys/time.h"

int main()

{

int on=1;

int led;

int fd;

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

if (fd < 0) {

perror("open device leds");

exit(1);

}

printf("leds test show. press ctrl+c to exit \n");

while(1)

{

for(led=0;led<4;led++)

{

ioctl(fd, on, led);

usleep(50000);

}

on=!on;

}

close(fd);

return 0;

}

编辑完成，命一个名，如led_test.c, 然后该目录下进行静态编译：arm-linux-gcc -static led_test.c -o led_test

最后，在目标板上找到存放led_test.c的文件，执行./led_test,便可以看到想要的结果...