我用的是TQ2440开发板,这个程序是参考韦东山的.
4盏LED灯
以下是驱动程序
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- static struct class *firstdrv_class;
- static struct class_device *firstdrv_class_dev;
- volatile unsigned long *gpbcon = NULL;
- volatile unsigned long *gpbdat = NULL;
- static int first_drv_open(struct inode *inode, struct file *file)
- {
- //printk("first_drv_openn");
- /* 配置gpb5,6,7,8为输出 */
- *gpbcon &= ~((0x3<<(5*2)) | (0x3<<(6*2)) | (0x3<<(7*2)) | (0x3<<(8*2)));
- *gpbcon |= ((0x1<<(5*2)) |(0x1<<(6*2)) | (0x1<<(7*2)) | (0x1<<(8*2)));
- return 0;
- }
- static ssize_t first_drv_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
- {
- int val;
- //printk("first_drv_writen");
- copy_from_user(&val, buf, count); // copy_to_user();
- if (val == 1)
- {
- // 点灯
- *gpbdat &= ~((1<<5) | (1<<6) | (1<<7) | (1<<8));
- }
- else
- {
- // 灭灯
- *gpbdat |= (1<<5) | (1<<6) | (1<<7) | (1<<8);
- }
- return 0;
- }
- static struct file_operations first_drv_fops = {
- .owner = THIS_MODULE, /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */
- .open = first_drv_open,
- .write = first_drv_write,
- };
- int major;
- static int first_drv_init(void)
- {
- major = register_chrdev(0, "first_drv", &first_drv_fops); // 注册, 告诉内核
- firstdrv_class = class_create(THIS_MODULE, "firstdrv");
- firstdrv_class_dev = class_device_create(firstdrv_class, NULL, MKDEV(major, 0), NULL, "xyz"); /* /dev/xyz */
- gpbcon = (volatile unsigned long *)ioremap(0x56000010, 16); //0x56000010是的GPIOB的
- gpbdat = gpbcon + 1;
- printk("first_drv_init...n");
- return 0;
- }
- static void first_drv_exit(void)
- {
- unregister_chrdev(major, "first_drv"); // 卸载
- class_device_unregister(firstdrv_class_dev);
- class_destroy(firstdrv_class);
- iounmap(gpbcon);
- printk("first_drv_exit...n");
- }
- module_init(first_drv_init);
- module_exit(first_drv_exit);
- MODULE_LICENSE("GPL");
以下是测试程序
- #include
- #include
- #include
- #include
- /* firstdrvtest on
- * firstdrvtest off
- */
- int main(int argc, char **argv)
- {
- int fd;
- int val = 1;
- fd = open("/dev/xyz", O_RDWR);
- if (fd < 0)
- {
- printf("can't open!n");
- }
- if (argc != 2)
- {
- printf("Usage :n");
- printf("%s n", argv[0]);
- return 0;
- }
- if (strcmp(argv[1], "on") == 0)
- {
- val = 1;
- }
- else
- {
- val = 0;
- }
- write(fd, &val, 4);
- return 0;
- }
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