[USRP-users] UHD Apps freeze with USRPB210

Banerjee, Soumen Soumen.Banerjee at Honeywell.com
Tue Oct 21 05:04:26 EDT 2014

When I executed uhd_usrp_probe, the fpga image was automatically downloaded and installed. I had run through this step before writing to the list as well. The apps continue to freeze.
Im guessing the uhd_fft would not have shown me a snapshot of the correct FM radio stations if the firmware hadn't been installed properly?
Is there anything else I can try?


From: Ralph A. Schmid, dk5ras [mailto:ralph at schmid.xxx]
Sent: Tuesday, October 21, 2014 11:40 AM
To: Banerjee, Soumen; usrp-users at lists.ettus.com
Subject: RE: [USRP-users] UHD Apps freeze with USRPB210

This sounds similar to my actual experiences. With the last release the USB disconnect problems are gone, but especially at higher sampling rates the system freezes after seconds up to one minute. Command line programs then show errors like this one:

UHD Error:
    The receive packet handler caught an exception.
    ValueError: bad vrt header or invalid packet length
UHD source block got error code 0xf

At the moment I have no idea what is happening, the whole thing is far from being usable at the moment, while it operates under Windows on the same PC for hours, so at least the hardware is OK.

OS is Kubuntu 14.04 32 bit low latency.

Unfortunately I was not able to build uhd on my Kubuntu 12 system, compile stops with some nirio error, but I do not have the time at the moment to go deeper into this.


From: USRP-users [mailto:usrp-users-bounces at lists.ettus.com] On Behalf Of Banerjee, Soumen via USRP-users
Sent: Monday, October 20, 2014 6:08 AM
To: usrp-users at lists.ettus.com<mailto:usrp-users at lists.ettus.com>
Subject: [USRP-users] UHD Apps freeze with USRPB210


I managed to install gnuradio and uhd and it seems to be able to detect the usrp device. It shows up in the output of lsusb.

I was trying out the simple fm radio demonstration and that one kept crashing. No debug output, nothing. It just froze. So I thought Ill look at the basics and tried to run the uhd_fft app (from path). I put the sampling frequency in the FM band since I know the FM stations over here and I was able to see peaks at the expected frequencies, but its not a continuous FFT. It just freezes immediately after the first graph is plotted. Is there something that Im missing? Im inclined to think that the installation went all right because the peaks in the snapshot FFT match so well with the expected radio stations!

I noted that someone else has had this problem with a N210 before, and they solved it by updating the OS and playing around with the Ethernet settings, but Im connected to the B210 over USB, so that method can't be tried.

Any suggestions?

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