# USB port stops receiving messages

**URL:** <https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230>\
**Category:** General Questions\
**Created:** [January 11, 2019, 7:55pm UTC](https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230 "2019-01-11T19:55:56Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![COSTA](https://forum.ubiquityrobotics.com/letter_avatar_proxy/v4/letter/c/85f322/32.png) [@COSTA](https://forum.ubiquityrobotics.com/u/COSTA)\
**Post date:** [January 11, 2019, 7:55pm UTC](https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230/1 "2019-01-11T19:55:56Z")

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Hi,

I have a Magni Silver and I connected a laser XV-11 Neato Lidar to do the navigation. But only in raspberry with the ubiquityrobot linux image, after running the laser for a brief time the ttyUSB0 port stops receiving messages.

The system log message when this occurs is as follows:

Jan 11 17:06:25 ubiquityrobot kernel: [663.875537] ftdi\_sio ttyUSB0: usb\_serial\_generic\_read\_bulk\_callback - urb stopped: -32

What do you suggest me to correct this?

Thank you!

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**Author:** ![mjstn2011](https://forum.ubiquityrobotics.com/user_avatar/forum.ubiquityrobotics.com/mjstn2011/32/30_2.png) [@mjstn2011](https://forum.ubiquityrobotics.com/u/mjstn2011)\
**Post date:** [January 11, 2019, 8:40pm UTC](https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230/2 "2019-01-11T20:40:13Z")

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A robot I have does this on our image and uses the get surreal controller attached to a Raspberry Pi 3.  
[https://www.getsurreal.com/product/xv-lidar-controller-v1-2/](https://www.getsurreal.com/product/xv-lidar-controller-v1-2/)

You must use a very good power source for the raspberry Pi 3 (as always) and use a short and very good USB cable to the controller so power is fine on the controller and Lidar.  
The page I have for a link has disappeared, sorry.

I would not recommend trying to do it all yourself with just a neato lidar and USB serial port as it is more prone to issues but is apparently possible. I have not done that.

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**Author:** ![davecrawley](https://forum.ubiquityrobotics.com/user_avatar/forum.ubiquityrobotics.com/davecrawley/32/24_2.png) [@davecrawley](https://forum.ubiquityrobotics.com/u/davecrawley)\
**Post date:** [January 11, 2019, 11:21pm UTC](https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230/3 "2019-01-11T23:21:35Z")

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Yes separate power is probably indicated - you can connect directly to the 5V main power supply on the robot.

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**Author:** ![anfederman](https://forum.ubiquityrobotics.com/user_avatar/forum.ubiquityrobotics.com/anfederman/32/141_2.png) [@anfederman](https://forum.ubiquityrobotics.com/u/anfederman)\
**Post date:** [January 13, 2019, 2:15pm UTC](https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230/4 "2019-01-13T14:15:34Z")

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The xv11 motor uses 3.3 volts. I have used an addition with an on board 3.3 v supply so I didn’t behave to build a:-) s:-)Sparta:-)he:-) circuit.

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**Author:** ![COSTA](https://forum.ubiquityrobotics.com/letter_avatar_proxy/v4/letter/c/85f322/32.png) [@COSTA](https://forum.ubiquityrobotics.com/u/COSTA)\
**Post date:** [January 18, 2019, 1:15pm UTC](https://forum.ubiquityrobotics.com/t/usb-port-stops-receiving-messages/230/5 "2019-01-18T13:15:15Z")

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Thanks for all help!

but I solved this by changing kernel parameters. More precisely just changing dwc\_otg.speed -\> 1 and the lidar started to run without falls 🙂