/dev/ttyUSB* not found

Robotics & Edge Computing Jetson & Embedded Systems Jetson TK1
1

Hi,

I am using CP210x USB-UART bridge and something wrong with usb-serial.
I also found similar question in this forum,but it seems not work for me.
https://devtalk.nvidia.com/default/topic/890599/?comment=4786915

as you can see ,cp210x driver is working fine.

ubuntu@tegra-ubuntu:~$ lsusb
Bus 002 Device 003: ID 05e3:0617 Genesys Logic, Inc.
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 018: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR mySmartUSB light
Bus 001 Device 014: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 001 Device 013: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

but /dev/ttyUSB* is not showing.

ubuntu@tegra-ubuntu:~$ ls /dev/tty*
/dev/tty    /dev/tty15  /dev/tty22  /dev/tty3   /dev/tty37  /dev/tty44  /dev/tty51  /dev/tty59  /dev/tty9
/dev/tty0   /dev/tty16  /dev/tty23  /dev/tty30  /dev/tty38  /dev/tty45  /dev/tty52  /dev/tty6   /dev/ttyS0
/dev/tty1   /dev/tty17  /dev/tty24  /dev/tty31  /dev/tty39  /dev/tty46  /dev/tty53  /dev/tty60  /dev/ttyS1
/dev/tty10  /dev/tty18  /dev/tty25  /dev/tty32  /dev/tty4   /dev/tty47  /dev/tty54  /dev/tty61  /dev/ttyS2
/dev/tty11  /dev/tty19  /dev/tty26  /dev/tty33  /dev/tty40  /dev/tty48  /dev/tty55  /dev/tty62  /dev/ttyS3
/dev/tty12  /dev/tty2   /dev/tty27  /dev/tty34  /dev/tty41  /dev/tty49  /dev/tty56  /dev/tty63  /dev/ttyTHS0
/dev/tty13  /dev/tty20  /dev/tty28  /dev/tty35  /dev/tty42  /dev/tty5   /dev/tty57  /dev/tty7   /dev/ttyTHS1
/dev/tty14  /dev/tty21  /dev/tty29  /dev/tty36  /dev/tty43  /dev/tty50  /dev/tty58  /dev/tty8   /dev/ttyTHS2

here is kernel message

ubuntu@tegra-ubuntu:~$ uname -r
3.10.40-wifiUVC
ubuntu@tegra-ubuntu:~$ uname -a
Linux tegra-ubuntu 3.10.40-wifiUVC #1 SMP PREEMPT Thu Jan 21 13:43:16 UTC 2016 armv7l armv7l armv7l GNU/Linux
ubuntu@tegra-ubuntu:~$

Thanks for someone who responds me :)

2

More details on how this device is connected would be useful. I’m going to guess one USB connector to either host or Jetson, and some sort of serial device.

FYI, because USB standards have protocols to identify end devices, the presence of the device in lsusb only indicates USB is working. At the moment USB detects a device, an event broadcasts to the hotplug layer and asks if any drivers want ownership of that device…so lsusb will show a device even if no driver takes ownership via the hotplug layer.

The content of “/dev” is itself a reflection of what drivers are active and take ownership of. The lack of an expected “/dev” USB file could mean either no driver took ownership, or that devfs has renamed the file to some more customized name, or that the driver simply was not programmed to create such a file.

3

Hi linuxdev ,

Thank you so much for your repsonse!
But I still don’t understand how to do , could you explain it more?

Alyson

4

Simply describe all of the cable types and connection types between the USB-UART and Jetson and host. Additionally, any information on function or role you expect from the USB-UART would be of benefit (e.g., serial console or control of a camera, so on).