[USRP-users] USB problems

Marcus Müller marcus.mueller at ettus.com
Tue Jul 28 17:34:03 EDT 2015


Hi Ravi,

you seem to have two different, competing UHD installations, one in 
/usr/local/, and one in /usr/.

Make sure you only have one. Again, it's important that you remove all 
other UHDs from your system before you install your self-built UHD.

Best regards,
Marcus

On 28.07.2015 23:31, Vsr Ravi wrote:
> Hi,
> Thanks for the suggestions that you have given. But I have encountered 
> a problem. Whenever I run the file of Latency_test located in 
> /usr/lib/uhd/examples, I get the error as
>
> Error: LookupError: IndexError: multi_usrp::mb_root(140725369489696) - 
> vector::_M_range_check
>
> And when I run "test_messages" command, it shows
>
> Segmentation fault (core dumped)
>
> Please suggest as to what I can do to prevent the above errors. Thank you
>
> Regards,
> Ravi
>
>
>
>
> On Tuesday, 28 July 2015 4:28 AM, Marcus Müller 
> <marcus.mueller at ettus.com> wrote:
>
>
> Hi Ravi,
>
> On 28.07.2015 00:55, Vsr Ravi wrote:
>> Hey all,
>> I have tried to run the USRP1 by giving the command "sudo 
>> uhd_usrp_probe and I get the result as below.
>>
>> linux; GNU C++ version 4.8.4; Boost_105500; UHD_003.009.git-144-g407e3086
>>
>> -- Opening a USRP1 device...
>> -- Loading FPGA image: /usr/local/share/uhd/images/usrp1_fpga.rbf... done
> ...
>>
>> Can anyone please tell what this means and what do I do next as I am 
>> new to gnuradio. Thanks
> As Martin said: Both your USRP as your UHD installation work pretty well!
> The only thing is that you need to run it as root (the sudo part), and 
> that's not a good thing.
> Can you make sure that /etc/udev/rules.d/ contains the uhd.rules 
> file[1]? If not, copy it over from 
> /usr/local/lib/uhd/utils/uhd-usrp.rules, e.g. like
> sudo cp /usr/local/lib/uhd/utils/uhd-usrp.rules /etc/udev/rules.d/
>
> and then reboot.
>
> The next time you plug in your USRP, it should no longer be only 
> accessible by root.
>
> Best regards,
> Marcus
>
> [1] You said earlier you did
> cd usr/lib/uhd/utils
> sudo cp uhd-usrp.rules /etc/udev/rules.d/
> sudo udevadm control --reload-rules
> sudo udevadm trigger
> but that's not the right path, if uhd is installed to /usr/local/...
>
>
>
>

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