Forum: GNU Radio uhd_find_devices issue

Hi
     I installed and was working with gnuradio for some time now. 
Suddenly
from two days i find that my device is not being detected. I run
uhd_find_devices or uhd_fft , I get uhd device not found. I checked my
network connections and set sudo ifconfig eth0 192.168.10.1 and also
checked that it's subnet mask is set to 255.255.255.0. But my eth 0 
shows
no received packets. I have attached the screenshot of it. when i try to
run uhd_fft and uhd_find_devices it says no uhd device found.I have
attached the screenshot of the same too. what could be the problem. I am
sure the installation is right because my grc is opening and i worked on 
it
a few days back.

In your screenshot, it looks like your eth0 ip address was lost.

Tim
Sent on the Sprint Now Network from my BlackBerry

sorry, i uploaded the wrong screenshot. I have uploaded the right one 
here.

I am getting the following output..


karan@karan-laptop:/usr/local/bin$ uhd_usrp_probe --args 
"addr=192.168.10.2"
linux; GNU C++ version 4.4.3; Boost_104000; UHD_003.005.000-8-g49193c85

Error: LookupError: KeyError: No devices found for ----->
Device Address:
    addr: 192.168.10.2

how i connected the setup is I powered my usrp n200 with the power cord. 
I
connected an ethernet cable from usrp ethernet port  to a gigabit 
ethernet
switch and from the switch i am connecting an ethernet cable to my 
laptop's
ethernet port.I also tried to connect the ethernet cable directly from 
usrp
to my laptop. .It didn't change. Is it ok if ifconfig eth0 says Rx 
packets
as 0?

>     addr: 192.168.10.2
>
> how i connected the setup is I powered my usrp n200 with the power
> cord. I connected an ethernet cable from usrp ethernet port  to a
> gigabit ethernet switch and from the switch i am connecting an
> ethernet cable to my laptop's ethernet port.I also tried to connect
> the ethernet cable directly from usrp to my laptop. .It didn't change.
> Is it ok if ifconfig eth0 says Rx packets as 0?
>
Have you changed the FPGA/Firmware on the device?  Are you sure that
your host ethernet port isn't being managed by Netmanager with DHCP 
support?
   That will screw up up.

Have you tried a different Ethernet cable?

Is your laptop ethernet port 1GiGe capable?




--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

Hi Marcus,

                 I have not changed the fpga firmware. I used the
build-gnuradio script to install gnuradio. I am not finding another
ethernet cable in the lab. I will check that and let you know in some 
hours.

My ethernet card in laptop is rtl 8101e. I checked that it is capable of
only 100 Mbps. But here i am using a gigabit switch, so it shouldn't be 
a
problem right. How should i check if my ethernet port is managed by
netmanager with dhcp support? In my network connections it says auto 
eth0
for ethernet

> oh suddenly it is working. i am able to run uhd_find_devices and
> uhd_fft also. That's great. Thanks a lot Marcus. why did it suddenly
> work? was it pinging it which helped?
I'm suspecting that your gigabit switch has "funny" behaviour.


> secondly when i am running uhd_fft i get this exception
>
> Using Volk machine: sse4_2_32
> thread[thread-per-block[0]: <gr_block gr uhd usrp source (1)>]: caught
> unrecognized exception
>
> Is it something i need to act on or is it just a warning..
>
> Thanks again. It was very helpful.
>
What version of Gnu Radio are you running?

Also, see the Gnu Radio pages about troubleshooting.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

I am using gnuradio 3.6.2. I will check the gnuradio pages and see. 
Thanks.