未应用Udev规则 [英] Udev rule is not being applied

问题描述

我正在Android设备上运行Linux chroot环境，并且尝试与基于Atmel atmega2560(源自Arduino Mega的)微控制器进行通信.进行"ls -ld/dev/ttyACM0"将显示调制解调器的以下权限:

I am running a Linux chroot environment on an Android device and I am attempting to communicate with an Atmel atmega2560 based (Arduino Mega derived) microcontroller. Doing "ls -ld /dev/ttyACM0" shows the following permissions for the modem:

crw------- 1 root root 166, 0 Feb 11 22:28 /dev/ttyACM0

"lsusb"告诉我:

"lsusb" tells me:

Bus 003 Devices: ID 03eb:204b Atmel Corp. LUFA USB to Serial Adpater Project

"udevadm信息--attribute-walk --name = ttyACM0"说:

"udevadm info --attribute-walk --name=ttyACM0" says:

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/platform/sunxi_hcd_host0/usb3/3-1/3-1:1.0/tty/ttyACM0':
    KERNEL=="ttyACM0"
    SUBSYSTEM=="tty"
    DRIVER==""

  looking at parent device '/devices/platform/sunxi_hcd_host0/usb3/3-1/3-1:1.0':
    KERNELS=="3-1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="cdc_acm"
    ATTRS{bInterfaceClass}=="02"
    ATTRS{bmCapabilities}=="6"
    ATTRS{bInterfaceSubClass}=="02"
    ATTRS{bInterfaceProtocol}=="01"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/platform/sunxi_hcd_host0/usb3/3-1':
    KERNELS=="3-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="1"
    ATTRS{idVendor}=="03eb"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 2"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{busnum}=="3"
    ATTRS{devnum}=="20"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="200mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="c0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="8888"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="55330343534351415012"
    ATTRS{version}==" 1.10"
    ATTRS{urbnum}=="12"
    ATTRS{manufacturer}=="RRD (www.ru"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="204b"
    ATTRS{bDeviceClass}=="02"
    ATTRS{product}=="RUMBA - ATmega 2560 co"

  looking at parent device '/devices/platform/sunxi_hcd_host0/usb3':
    KERNELS=="usb3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="3"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="  0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="1"
    ATTRS{bcdDevice}=="0304"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="sunxi_hcd_host0"
    ATTRS{version}==" 1.10"
    ATTRS{urbnum}=="777"
    ATTRS{manufacturer}=="Linux 3.4.39 sunxi_hcd-hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0001"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="sunxi_hcd host driver"

  looking at parent device '/devices/platform/sunxi_hcd_host0':
    KERNELS=="sunxi_hcd_host0"
    SUBSYSTEMS=="platform"
    DRIVERS=="sunxi_hcd_host0"

  looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""

因此，我创建了文件'/etc/udev/rules.d/99-arduino.rules'，其中包含:

Therefore, I created the file '/etc/udev/rules.d/99-arduino.rules' which contains:

SUBSYSTEMS=="usb", ATTRS{idVendor}=="03eb", ATTRS{idProduct}=="204b", MODE:="0666"

试图允许我的用户具有读/写权限.我不能仅以root权限运行我的应用程序，我需要ttyACM *的所有权(请注意，我也尝试过OWNER ="myusername"而不是MODE:="0666").

In an attempt to allow read/write permission for my user. I cannot just run my application with root permission, I need ownership of ttyACM* (note I have also tried OWNER="myusername" instead of MODE:="0666").

推荐答案

事实证明，我只需要执行"service udev restart"，就可以突然开始工作.以前，我尝试过"udevadm控制--reload-rules"，"udevadm控制--reload"，"udevadm控制触发器"，然后重新启动系统，但没有一个起作用.

It turns out I just needed to do "service udev restart" and all of the sudden it started working. Previously I tried "udevadm control --reload-rules", "udevadm control --reload", "udevadm control trigger", and restarting the system, none of which worked.

这篇关于未应用Udev规则的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！