Hello,
My gnuradio application seems to freeze from time to time. I think that
this issue was raised before (
http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2012-March/003969.html).
However, I did not see a solution that would “permanently” fix the
problem.
My application works in a repeated on-off manner. The receiver USRP
works
in the following way:
1.The flowgraph starts. It runs for 5 second while collecting data and
doing some online processing. Thereafter, the flowgraph stops.
2. I do some off-line processing with the stored data for the next 5
seconds
3. The flowgraph is restarted and step 1-2 are repeated.
The flowgraph looks like the following:
USRP Source → Log power FFT → Vector to stream → File Sink.
However, the flow graph freezes from time to time. This freezing occurs
once in every 5-10 trials. It is surprising since I hardly see any
overrun
in the receiver (I am running the USRP at 4 MS/s and performing 4096
point
FFT). Besides, I have a python code that pings the USRP every time
before
starting the flowgraph.
I am using USRP N210, the latest GNUradio & UHD drivers, Ubuntu 12.04.
Any
suggestions on resolving this issue will be very appreciated.
Thanks,
Nazmul
–
Muhammad Nazmul I.
Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.