Fwd: regarding your paper

GNU Radio
1

hi ,
i have gone through bastin bloessl’s code for ieee_802_15_4. i
installed
it in my ubuntu 12.04 having gnuradio v3.7 . it installed and i got the
following error when i was trying to run the flowgraph.

Traceback (most recent call last):
File “/home/cps/.grc_gnuradio/ieee802_15_4_phy.py”, line 16, in

import ieee802_15_4
File
“/usr/local/lib/python2.7/dist-packages/ieee802_15_4/init.py”,
line 17, in
from ieee802_15_4_swig import *
File
“/usr/local/lib/python2.7/dist-packages/ieee802_15_4/ieee802_15_4_swig.py”,
line 26, in
_ieee802_15_4_swig = swig_import_helper()
File
“/usr/local/lib/python2.7/dist-packages/ieee802_15_4/ieee802_15_4_swig.py”,
line 22, in swig_import_helper
_mod = imp.load_module(’_ieee802_15_4_swig’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-ieee802_15_4.so: undefined
symbol:
_ZN2gr6blocks12count_bits32Ej

i have no idea what it means. is it the problem with count_bits block.

looking forward for the reply.

thanks,
lingeswar

2

Hi Lingeswar,

“/usr/local/lib/python2.7/dist-packages/ieee802_15_4/ieee802_15_4_swig.py”,

line 22, in swig_import_helper
_mod = imp.load_module(‘_ieee802_15_4_swig’, fp, pathname,
description)
ImportError: /usr/local/lib/libgnuradio-ieee802_15_4.so: undefined
symbol: _ZN2gr6blocks12count_bits32Ej

I guess libgnuradio-ieee802_15_4.so is not linked against
libgnuradio-blocks.so. You can check that with

ldd libgnuradio-ieee802_15_4.so

Are you using the most recent version of 15.4? Linking should work
latest since this commit

Best,
Bastian