gnuradio-companion flooding console with the letter D

gnuradio usrp
Alex K picture Alex K · Nov 26, 2013 · Viewed 9.2k times · Source

I'm running a very simple flow graph in GNU Radio Companion, consisting of a USRP Source, which is connected to (1) a quadrature demod that is connected to a wxgui scope sink and (2) a wxgui fft sink. These display and draw the expected results, but at the same time the console portion gets flooded with the letter D which slows down the GUI elements until they stop responding. From the console output:

Generating: "/home/gnuradio/top_block.py"

Executing: "/home/gnuradio/top_block.py"

linux; GNU C++ version 4.7.3; Boost_104900; UHD_003.005.004-0-unknown

Using Volk machine: ssse3_64 -- Opening a USRP2/N-Series device... -- Current recv frame size: 1472 bytes -- Current send frame size: 1472 bytes -- Detecting internal GPSDO.... not found

UHD Warning: Unable to set the thread priority. Performance may be negatively affected. Please see the general application notes in the manual for instructions. EnvironmentError: OSError: error in pthread_setschedparam DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...

where the Ds repeat until the flow graph is terminated. Unfortunately, single-letter error codes (assuming that's what these are) are extremely difficult to search for online!

Answer

eontool picture eontool · Nov 27, 2013

Its indicating an overflow.

"When UHD software detects the overflow, it prints an 'O' or 'D'"

Here's the documentation: http://files.ettus.com/manual/page_general.html#general_ounotes

Related questions

When trying to use my USRP in GNU Radio, I get a " No devices found for ----->" error

When trying to execute a GNU Radio program that uses a USRP, I get an error backtrace, which (in Python) typically ends with: self.u = uhd.usrp_source(device_addr=args, stream_args=uhd.stream_args('fc32')) File "/home/…

Read More
How do I use installed packages in PyCharm?

In PyCharm, I've added the Python environment /usr/bin/python. However, from gnuradio import gr fails as an undefined reference. However, it works fine in the Python interpreter from the command line. GNURadio works fine with python outside of Pycharm. …

Read More
How to correctly set PYTHONPATH for Visual Studio Code

How do I correctly set up the $PYTHONPATH variable for my workspace in VisualStudio Code? Background Information I have installed two versions of GNURadio: GNURadio version 3.7.11 installed by the Linux Mint package manager in /usr/lib/python2.7/dist-packages/gnuradio GNURadio …

Read More