Dear USRP-Users,
I wanted to get back to you on the topic mentioned below. Meanwhile I reworked
my code to work directly with the uhd Python class instead of using a gnuradio
wrapper.
Unfortunately I run into the identical issue again.
Code is:
>>
import uhd
import numpy as np
device = uhd.usrp.MultiUSRP(“type=x300,addr=192.168.40.2”)
for i in range(200):
sig = device.recv_num_samps(int(1e5),900e6,4e6,[0],0)
print(np.mean(sig))
<<
It’ll crash after 104 runs in file multi_usrp.py on line 54:
>>
super(MultiUSRP, self).set_rx_gain(gain,chan)
<<
with the message mentioned below
>>
RfnocError: OpTimeout: Control operation timed out waiting for space in command
buffer
<<
Anybody got an idea, if this might be some known issue with e.g. the FPGA code,
or the drivers?
Best regards
Christoph
Christoph Schultz
RF System Architect
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From: Christoph Schultz (Riedel) <christoph.schu...@riedel.net>
Sent: Donnerstag, 25. November 2021 17:08
To: usrp-users@lists.ettus.com
Subject: RfnocError: OpTimeout: Control operation timed out waiting for space
in command buffer
Dear USRP-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
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