[作品]

【EVB-335X-II试用体验】- 基于MISC 操作gpio

2016-8-13 10:40:05 3116

0 使用MISCDEVICE 对gpio 进行操作，使用linux驱动框架更方便的操作 #include #include #include #include //#include #include #include #include #include #include #include //#include #define AM335X_GPIO(bank,gpio) (32(bank)+(gpio)) //define gpio port number #define REV_DEV_MINOR 112 //unsigned int irq = 0; char kbuf[100]; static ssize_t fop_write(struct file filp, const char __user ubuf, size_t count, loff_t ppos) { if (copy_from_user(kbuf,ubuf,1)){ printk("write is error n"); } switch (kbuf[0]){ case '1': gpio_set_value(AM335X_GPIO(3,4),1); break; case '0': gpio_set_value(AM335X_GPIO(3,4),0); break; default : break; } return 0; } int fop_open(struct inode inode, struct file filp) { printk("success open the file n"); return 0; } int fop_release(struct inode inode, struct file filp) { printk("success close the file n"); return 0; } static const struct file_operations rev_fops = { .owner = THIS_MODULE, .write = fop_write, .open = fop_open, .release = fop_release, }; static struct miscdevice rev_dev = { .minor = REV_DEV_MINOR, .name = "rev_dev", .fops = &rev_fops, }; static int __init leds_init(void) { /* * interrupt port / int rc = -1; //irq = gpio_to_irq(AM335X_GPIO(3,16)); / * mis_device port */ rc = misc_register(&rev_dev); if (rc){ printk("misc rigester is error n"); } if(gpio_request(AM335X_GPIO(3,16),"rec_gpio")){ printk("gpio_request is error n"); return -EINVAL; } gpio_direction_output(AM335X_GPIO(3,16),0); return 0; } static void __exit leds_exit(void) { printk(KERN_INFO "success fress n"); gpio_free(AM335X_GPIO(3,16)); //misc_deregister(&rev_dev); } module_init(leds_init); module_exit(leds_exit); MODULE_LICENSE("GPL"); 0
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0 您好.我是用贵公司的板子，请问wince6.如何实现multi-bin技术实现快速启动。

2016-12-2 10:21:56 评论举报 1^# 龙锐陈