bash 在 Linux 中以编程方式断开和重新连接 ttyUSB0
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Disconnect and reconnect ttyUSB0 programmatically in Linux
提问by JosephITA
Trying to solve this problem(ttyUSB0 that works properly than stop working after about 1hr)I'm thinking on if disconnecting and reconnecting the usb device could be a good fix.
试图解决这个问题（ttyUSB0 正常工作而不是在大约 1 小时后停止工作）我在考虑是否断开并重新连接 USB 设备可能是一个很好的解决方案。
So, it is possibile to cut down power to the USB device and repower it programmatically (bash)?
那么，是否可以降低 USB 设备的电源并以编程方式 (bash) 为其重新供电？
# lsusb -t
1-1:1.0: No such file or directory
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, Class=vend., Driver=, 12M
|__ Port 1: Dev 2, If 1, Class=vend., Driver=cp210x, 12M
On am335x, kernel 3.2.0, ubuntu core armhf.
在 am335x 上，内核 3.2.0，ubuntu 核心 armhf。
[ 1.784332] usb 1-1: cp210x converter now attached to ttyUSB0
At the moment I need a complete power cycle to have ttyUSB0back.
目前我需要一个完整的电源循环才能ttyUSB0恢复。
回答by Robert Harvey
This is the solution:
这是解决方案：
Find the identity of your usb device.
# tree /sys/bus/usb/drivers/cp210x/ /sys/bus/usb/drivers/cp210x/ |-- 1-1:1.1 -> ../../../../devices/platform/omap/musb-ti81xx/musb-hdrc.1/usb1/1-1/1-1:1.1 |-- bind |-- module -> ../../../../module/cp210x |-- remove_id |-- uevent -- unbind
找到您的 USB 设备的身份。
# tree /sys/bus/usb/drivers/cp210x/ /sys/bus/usb/drivers/cp210x/ |-- 1-1:1.1 -> ../../../../devices/platform/omap/musb-ti81xx/musb-hdrc.1/usb1/1-1/1-1:1.1 |-- bind |-- module -> ../../../../module/cp210x |-- remove_id |-- uevent -- unbind
So 1-1:1.1is the identifier of my ttyUSB0(it can be discovered also via dmesg).
1-1:1.1我的标识符也是如此ttyUSB0（也可以通过 发现dmesg）。
Then, disconnect the device (as root):
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/unbindreconnect it
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/bind
然后，断开设备（以 root 身份）：
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/unbind重新连接
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/bind
At this point I had the same device but with a different name, it was now ttyUSB1 instead of ttyUSB0.
- To avoid this I added a new rule in /etc/udev/rules.d/by creating a new file named 99-usb-serial.ruleswith this line:
此时我有相同的设备，但名称不同，现在是 ttyUSB1 而不是 ttyUSB0。- 为了避免这种情况，我/etc/udev/rules.d/通过创建一个99-usb-serial.rules以这一行命名的新文件添加了一个新规则：
SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea70", ATTRS{serial}=="002DCFAF", SYMLINK+="sameName", MODE:="0666"
where idVendor, idProductand serial must be the values of your device. This rule will create a new device called sameNamelinked to the ttyUSB*device normally generated from the OS.
其中idVendor,idProduct和 serial 必须是您设备的值。此规则将创建一个名为sameName链接到ttyUSB*通常从操作系统生成的设备的新设备。
回答by Χριστιαν?δη? Βασ?λειο?
As @Robert Harvey Said,
正如@Robert Harvey 所说，
You first need to find our driver that will help you 'unplug and plug' the usb. Type: ls /sys/bus/usb/driverswhich should print something like this: btusb ftdi_sio hub usb usbfs usbhid usbserial_generic uvcvideo. These, are all the drivers for each usb device. Now, lets say mine is ftdi_sio, which is a device i use to program my arduino (atmega328p chip). I am not sure how Your/other usb devices name themselves there. Like, i dont know which of these is my mouse.
Now, you can see the driver's commands using:
ls /sys/bus/usb/drivers/ftdi_sio/, which will print something like: 1-4:1.0 bind module uevent unbind, Where 1-4:1.0is the device's characteristic code, and the bindand unbindcommand, which are the 'plug' and 'unplug' command respectively.
您首先需要找到我们的驱动程序，它将帮助您“拔出和插入”USB。类型：ls /sys/bus/usb/drivers它应该打印这样的东西：btusb ftdi_sio hub usb usbfs usbhid usbserial_generic uvcvideo。这些，是每个 USB 设备的所有驱动程序。现在，假设我的是ftdi_sio，这是我用来对我的 arduino（atmega328p 芯片）进行编程的设备。我不确定您/其他 USB 设备在那里如何命名。就像，我不知道哪一个是我的鼠标。现在，您可以使用以下命令查看驱动程序的命令：
ls /sys/bus/usb/drivers/ftdi_sio/，它将打印如下内容：1-4:1.0 bind module uevent unbind，1-4:1.0设备的特征代码在哪里，以及bindandunbind命令，分别是“plug”和“unplug”命令。
Now, if i want to unplug programatically the ftdi usb port, i will type:
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbindand, to plug it again:
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
现在，如果我想以编程方式拔下 ftdi usb 端口，我将输入：
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind然后再次插入：
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
Now, we can combine all the commands together, with a ';':
现在，我们可以用“;”将所有命令组合在一起：
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind ; echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind ; echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
