第一个驱动代码-点亮led

查看全部 · 发表于 2019-6-13 11:30:35

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linux环境下编译通过
部分代码如下：
static int ledopen(struct inode *inode, struct file *file)
{
*gpfcon &= ~(0x3<<(pin*2));
*gpfcon |= (0x1<<(pin*2));
return 0;
}
static ssize_t ledwrite(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
{
int val,ret;
ret = copy_from_user(&val, buf, count);
if (val == 1)
{
*gpfdat &= ~(1<<pin);

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Makefile文件

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}
else
{
  *gpfdat |= (1<<pin);
}
return 0;
}
static struct file_operations ledops = {
.owner  = THIS_MODULE,
.open = ledopen,
.write  = ledwrite,
};
static struct miscdevice ledmisc = {
MISC_DYNAMIC_MINOR,
"platled",
&ledops,
};
static int ledprobe(struct platform_device *pdev)
{
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
gpfcon = ioremap(res->start, res->end - res->start + 1);
gpfdat = gpfcon + 1;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
pin = res->start;
misc_register(&ledmisc);
return 0;
}
static int ledremove(struct platform_device *pdev)
{
iounmap(gpfcon);
misc_deregister(&ledmisc);
return 0;
}
struct platform_driver leddri = {
.probe  = ledprobe,
.remove  = ledremove,
.driver  = {
  .name = "myled",
}
};
static int led_init(void)
{
platform_driver_register(&leddri);
return 0;
}
static void led_exit(void)
{
platform_driver_unregister(&leddri);
}
module_init(led_init);
module_exit(led_exit);
MODULE_LICENSE("GPL");
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leddev.c

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测试代码

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