帮我看下led灯为什么不亮啊?!!!!!
我用光盘配套的led驱动和led应用程序,驱动是动态加载的。应用程序怎么跑起来没反应啊?ps:已经照着手册去除了内核自带的led驱动了。 #include <stdio.h>#include <string.h>
#include <stdlib.h>
#include <fcntl.h> // open() close()
#include <unistd.h> // read() write()
#define DEVICE_NAME "/dev/GPIO-Control"
//define LED STATUS
#define LED_ON0
#define LED_OFF 1
//------------------------------------- main ---------------------------------------------
int main(void)
{
int fd;
int ret;
char *i;
printf("\nstart gpio_led_driver test\n\n");
fd = open(DEVICE_NAME, O_RDWR);
printf("fd = %d\n",fd);
if (fd == -1)
{
printf("open device %s error\n",DEVICE_NAME);
}
else
{
while(1)
{ ioctl(fd,LED_OFF,1);
sleep(1);//μè′y1ÃëÔù×öÏÂò»2½2ù×÷
ioctl(fd,LED_ON,1);
sleep(1);
}
// close
ret = close(fd);
printf ("ret=%d\n",ret);
printf ("close gpio_led_driver test\n");
}
return 0;
}// end main
本帖最后由 chen4013874 于 2012-7-1 21:03 编辑
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <asm/irq.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/unistd.h>
#define DEVICE_NAME "GPIO-Control"
#define IOCTL_GPIO_ON 1
#define IOCTL_GPIO_OFF 0
static unsigned long gpio_table [] =
{
S3C2410_GPB5,
S3C2410_GPB6,
S3C2410_GPB7,
S3C2410_GPB8,
};
static unsigned int gpio_cfg_table [] =
{
S3C2410_GPB5_OUTP,
S3C2410_GPB6_OUTP,
S3C2410_GPB7_OUTP,
S3C2410_GPB8_OUTP,
};
static int tq2440_gpio_ioctl(
struct inode *inode,
struct file *file,
unsigned int cmd,
unsigned long arg)
{
if (arg > 4)
{
return -EINVAL;
}
switch(cmd)
{
case IOCTL_GPIO_ON:
s3c2410_gpio_setpin(gpio_table, 1);
return 0;
case IOCTL_GPIO_OFF:
s3c2410_gpio_setpin(gpio_table, 0);
return 0;
default:
return -EINVAL;
}
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.ioctl = tq2440_gpio_ioctl,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init dev_init(void)
{
int ret;
int i;
for (i = 0; i < 4; i++)
{
s3c2410_gpio_cfgpin(gpio_table, gpio_cfg_table);
s3c2410_gpio_setpin(gpio_table, 0);
}
ret = misc_register(&misc);
printk (DEVICE_NAME" initialized\n");
return ret;
}
static void __exit dev_exit(void)
{
misc_deregister(&misc);
}
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
ps:加载玩内核和文件系统后 灯是全亮的 不像pdf写的那样2亮2灭的。而且我装在内核模块后,应用没反应。但是用板子上自带的led测试是行的。。。。 help!!!!!!!!!!!!
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