Asking help about gr-ieee802.11

GNU Radio
1

hi. I am newbie of gnuradio.i try run wifi_loopback.grc, all the port
are connected.but when i run it comes out with this messege below:

Generating: “/home/user/gr-ieee802-11/examples/wifi_loopback.py”

Warning: This flow graph may not have flow control: no audio or RF hardware
blocks found. Add a Misc->Throttle block to your flow graph to avoid CPU
congestion.

Executing: “/home/user/gr-ieee802-11/examples/wifi_loopback.py”

linux; GNU C++ version 4.8.2; Boost_105400;
UHD_003.009.git-171-g51bc00ee

Using Volk machine: avx_64_mmx_orc
OFDM MAPPER: encoding: 0
set_min_output_buffer on block 31 to 96000
set_min_output_buffer on block 33 to 96000
set_min_output_buffer on block 35 to 96000
set_min_output_buffer on block 36 to 96000
set_min_output_buffer on block 39 to 96000
set_min_output_buffer on block 50 to 96000

Done (return code -11)

below is my system info:
user@userr-X455LDB:~$ python -V
Python 2.7.6
user@userr-X455LDB:~$ gnuradio-config-info -v
3.7.7.1
user@userr-X455LDB:~$ uname -a
Linux userr-X455LDB 3.13.0-53-generic #89-Ubuntu SMP Wed May 20 10:34:39
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
user@userr-X455LDB:~$ gcc --version
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Copyright © 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

user@userr-X455LDB:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION=“Ubuntu 14.04.2 LTS”

what can i do? i hope you can help me.
thanks

2

Hi Nur,

the actual error message is not shown in your output. I think you should
run the flow graph in gdb with something like

gbd python
gdb-prompt> run /home/user/gr-ieee802-11/examples/wifi_loopback.py

once you hit the error
gdb-prompt> bt

Best,
Bastian

set_min_output_buffer on block 36 to 96000
3.7.7.1

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–
Dipl.-Inform. Bastian B.
Distributed Embedded Systems Group
University of Paderborn, Germany

3

user@userr-X455LDB:~$ /home/user/gr-ieee802-11/examples/wifi_loopback.py
linux; GNU C++ version 4.8.2; Boost_105400;
UHD_003.009.git-171-g51bc00ee

Using Volk machine: avx_64_mmx_orc
OFDM MAPPER: encoding: 0
set_min_output_buffer on block 31 to 96000
set_min_output_buffer on block 33 to 96000
set_min_output_buffer on block 35 to 96000
set_min_output_buffer on block 36 to 96000
set_min_output_buffer on block 39 to 96000
set_min_output_buffer on block 50 to 96000
Segmentation fault (core dumped)

4

Dear Nur,

it would be very helpful if you could wrap you console output into one
or two sentences describing what you did.

I have no idea where the error message comes from and would suggest you
go to /home/user/gr-ieee802-11/ and do a
git reset --hard
then open examples/wifi_phy_hier.grc and build it. Then open
examples/wifi_loopback.grc and run it.

Best,
Bastian

5

(gdb) run /home/user/gr-ieee802-11/examples/wifi_loopback.py
Starting program: /home/user/gr-ieee802-11/examples/wifi_loopback.py
No executable file specified.
Use the “file” or “exec-file” command.
(gdb) bt
No stack.
what can i do?i hope you can help me.

6

Preferences file: /home/user/.grc
Block paths:
/usr/local/share/gnuradio/grc/blocks
/home/user/.grc_gnuradio

Loading: “/home/user/gr-ieee802-11/examples/wifi_phy_hier.grc”

Done

Showing: “/home/user/gr-ieee802-11/examples/wifi_phy_hier.grc”

Generating: “/home/user/.grc_gnuradio/wifi_phy_hier.py”

Generating: “/home/user/.grc_gnuradio/wifi_phy_hier.py”

Executing: “/home/user/.grc_gnuradio/wifi_phy_hier.py”

Done