Dear Gnuradio Users,
I am facing a crash when repeatedly receiving data on a X300 using Gnuradio.
To run into this issue, I load a top_block with a usrp_source, a head and a file_sink initially.
Then a sequence of start()-wait()-stop()-wait()-reconfigure is run for e.g. 200 times.
After a deterministic number of cycles the following error will appear:
thread[thread-per-block[0] <block usrp_source(1)>]: RfnocError: OpTimeout: Control operation timed out waiting for space in command buffer
Similar to the issue discussed here:
https://www.mail-archive.com/usrp-users@lists.ettus.com/msg11413.html
my first idea was, that the command buffer is getting filled faster than it is sent to the USRP device, but artificial sleeps between the loop cycles do not change the behavior at all.
I was also not successful in reloading the usrp_source object on Python level (without stopping the full python process, and restarting it again manually).
So it looks like the gnuradio functions leave something in the command buffer which I couldn’t clear so far without reloading the whole library by restarting Python.
Is this a known issue? Are there any ways to manually release the command buffer, or is it a potential bug, which should go to the bug tracker of gr?
Many thanks in advance and
Best regards
Christoph
Christoph Schultz
RF System Architect
RIEDEL
Communications GmbH & Co. KG
Uellendahler Str. 353
42109 Wuppertal
Deutschland
phone: +49 202 292-9150
Christoph.Schultz@riedel.net
www.riedel.net
____________________________
RIEDEL Communications GmbH & Co. KG
Registergericht: Amtsgericht Wuppertal HRA 22390
Umsatzsteuer-Identifikationsnummer: DE 814906984
Komplementärin: RIEDEL Communications International GmbH, Wuppertal
Registergericht: Amtsgericht Wuppertal HRB 17038
Geschäftsführer: Thomas Riedel, Frank Eischet, Martin Berger