如何找出哪个tty上的USB-RS232设备? [英] How to find out which USB-RS232 device is on which tty?

问题描述

我有两个基于相同USB-RS232芯片的不同USB设备. 当我将它们插入USB时，它们将安装到/dev/ttyUSB0 ... 3

I have two different USB devices based on the same USB-RS232 chips. When I plug those in the USB they are mounted to /dev/ttyUSB0...3

我的问题是，如何在脚本中找出哪个在tty上?

My problem is how, inside a script, I can find out which one is on what tty?

使用lsusb可以区分它们:

Using lsusb I can differentiate them:

$> lsusb | grep 0403:f850
Bus 004 Device 002: ID 0403:f850 Future Technology Devices International, Ltd
$> lsusb | grep 0403:6001
Bus 004 Device 003: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC

使用dmesg，我可以知道它们的安装位置:

And using dmesg I can tell where they were mounted:

$> dmesg | grep 'FTDI USB Serial Device converter now attached'
[36051.393350] usb 4-2: FTDI USB Serial Device converter now attached to ttyUSB1
[36061.823513] usb 4-1: FTDI USB Serial Device converter now attached to ttyUSB0

但是"usb 4-1"似乎与"Bus 004 Device 002"相对应.

But "usb 4-1" does not seem to correspond to "Bus 004 Device 002".

我是否可以假设"Bus 004 Device 001"始终是"USB root hub"，因此dmesg从1开始计数，从lsusb从2开始计数?

Can I assume that "Bus 004 Device 001" will always be an "USB root hub" and thus dmesg will count from 1 onwards and lsusb from 2 onwards?

或者您对如何将设备ID与安装点相关联(在脚本中)是否有其他建议?

Or do you have another suggestion on how to correlate device ID to mount point (inside a script)?

我正在使用Ubuntu 10.04 LTS.

I'm using Ubuntu 10.04 LTS.

推荐答案

使用sysfs查找更多信息:

Find more info using sysfs:

$ ls /sys/bus/usb-serial/devices/ -ltrah

lrwxrwxrwx 1 root root 0 2012-02-07 22:17 ttyUSB0 -> ../../../devices/pci0000:00/0000:00:0f.4/usb2/2-2/2-2:1.0/ttyUSB0

$ ls -ltrad /sys//devices/pci0000:00/0000:00:0f.4/usb2/2-2/2-2:1.0/ttyUSB0
drwxr-xr-x 4 root root 0 2012-02-07 22:17 /sys//devices/pci0000:00/0000:00:0f.4/usb2/2-2/2-2:1.0/ttyUSB0

$ ls -ltrad /dev/ttyUSB0 
crw-rw---- 1 root dialout 188, 0 2012-02-01 00:17 /dev/ttyUSB0

当然，链接的设备/...节点包含很多信息

Of course, the linked devices/... node contains a lot of information

如果卸下/插入设备，则设备号会不断增加. lsusb -t可用于将设备号与usb总线/端口相关联.

The device number keeps growing if devices are removed/inserted. lsusb -t can be used to correlate the device numbers with usb bus/port.

然后，"lsusb -d devID"可以确定哪个设备在哪个端口上. 最后，"ls/sys/bus/usb-serial/devices/-ltrah"将(按总线/端口)列出安装位置.

Then, 'lsusb -d devID' can determine what device is on which port. Finally 'ls /sys/bus/usb-serial/devices/ -ltrah' will list (by bus/port) where it was mounted.

不是很方便，但是它正常工作'

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