static void gpio_setup_cdev(struct gpio_dev *pDev, int index) { int err, devno = MKDEV(gpio_major, index); cdev_init(&pDev->cdev, &gpio_fops); pDev->cdev.owner = THIS_MODULE; pDev->cdev.ops = &gpio_fops; err = cdev_add(&pDev->cdev, devno, 1); if (err) printk(KERN_...
printk(KERN_ALERT "[ KERN_ALERT ] va_ddr_val=%#lX.\n", *(led_cdev->va_ddr)); //输出低电平 val = ioread32(led_cdev->va_dr); val |= ((unsigned int)0x01 << (led_cdev->led_pin+16)); val &= ~((unsigned int)0x01 << (led_cdev->led_pin)); iowrite32(val, led_cdev...
Cloud Studio代码运行 #include<linux/module.h>#include<linux/kernel.h>#include<linux/ctype.h>#include<linux/device.h>#include<linux/cdev.h>// GPIO 硬件相关宏定义#defineMYGPIO_HW_ENABLE// 设备名称#defineMYGPIO_NAME"mygpio"// 一共有4个 GPIO 口#defineMYGPIO_NUMBER4// 设备类staticstructclas...
",chrdevbase.major,chrdevbase.minor); /* 2、初始化 cdev */ chrdevbase.cdev.owner = THIS_MODULE; cdev_init(&chrdevbase.cdev, &chrdevbase_fops); /* 3、添加一个 cdev */ cdev_add(&chrdevbase.cdev, chrdevbase.devid, CHRDEVBASE_CNT); /* 4、创建类 */ chrdevbase.class = class_create(...
static void led_control(struct led_classdev *led_cdev, enum led_brightness brightness) { struct led_dev *led = container_of(led_cdev, struct led_dev, cdev); pr_info(" ENTER led_control led(0x%p)->desc=0x%p \n", led, led->desc); ...
struct cdev gpio_cdev[MYGPIO_NUMBER]; // 用来保存设备号 int gpio_major = 0; int gpio_minor = 0; #ifdef MYGPIO_HW_ENABLE // 硬件初始化函数,在驱动程序被加载的时候(gpio_driver_init)被调用 static void gpio_hw_init(int gpio) {
struct cdev cdev; //cdev字符设备 struct class *class; //类 struct device *device; //设备 int major; //主设备号 int minor; //次设备号 struct device_node *nd; //设备节点 int led_gpio; //所使用的gpio编号 }; struct gpioled_dev gpioled; //定义led设备 ...
struct cdev cdev; /* cdev */ struct class *class; /* 类 */ struct device *device; /* 设备 */ int major; /* 主设备号 */ int minor; /* 次设备号 */ struct device_node *nd; /* 设备节点 */ int led_gpio; /* led 所使用的 GPIO 编号 */ ...
通过以上步骤,你应该能够解决 jetson.gpio.gpio_cdev.gpioerror: [errno 13] opening gpio chip: permission denied 的问题。如果问题仍然存在,请确保仔细检查每一步骤,并确保你的系统环境和配置符合Jetson GPIO库的要求。
Rust Demo (使用cdev-gpio) list gpios extern crate gpio_cdev; use gpio_cdev::*; fn main() { let chip_iterator = match chips() { Ok(chips) => chips, Err(e) => { println!("Failedto get chip iterator: {:?}", e); return; ...