You say this happens periodically, but for me, it happens almost every time
I run nxt_ros. I have set nxt_ros to respawn in the launch file, and it just
keeps respawning. I applied the fix noted in Issue
5<http://code.google.com/p/nxt-python/issues/detail?id=5&can=1&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary%20Stars>on
the nxt-python bug tracker, but it provided no help either.

From,
    Max

On Sat, Aug 7, 2010 at 6:08 PM, Melonee Wise <mwise@willowgarage.com> wrote:

> This is a problem in the underlying driver in nxt_python... It occurs when
> the I2C bus is pulled too quickly by the python library... I will look more
> into a more permanent fix on monday morning since I don't have a brick at
> home. For now if it only happens periodically set nxt_ros respawn in your
> launch file..
>
> -Melonee
>
> On Aug 7, 2010, at 2:34 PM, Max B <skinkworks42@gmail.com> wrote:
>
> > Hello,
> >     I am using cturtle from the Ubuntu Lucid repositories, with the svn
> version of the nxt stack. I am running Ubuntu Lucid x64 with kernel
> 2.6.32-generic. I have an NXT controller, and I am trying to use it with
> ROS. I have an ultrasonic sensor configured for use on the robot. When I run
> nxt_ros with bluetooth, I get the error "nxt.error.I2CError: ls_get_status
> timeout" when it is setting up the sensors, and nxt_ros dies. When I use
> USB, I get the error "usb.USBError: No error" and nxt_ros dies. What can I
> do to fix this? If I comment out the ultrasonic sensor from the yaml file
> (and just leave two motors and a gyro), the process runs just fine.
> > From,
> >    Max
> > _______________________________________________
> > ros-users mailing list
> > ros-users@code.ros.org
> > https://code.ros.org/mailman/listinfo/ros-users
> _______________________________________________
> ros-users mailing list
> ros-users@code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>