Re: [Discuss-gnuradio] [Douglas Geiger BBN 802.11b] Porting code on USRP2 problems

[Ben Yahmed]

Hi all,

I'm very interested in the code you are discussing and as a first step I 
installed gnuradio and the svn code taken from 
https://www.cgran.org/browser/projects/bbn_80211/branches/usrp2_version 
on a fedora core 10 and tried to test the bbn_80211b_test.py, but I 
encountred this problem:


# ./bbn_80211b_test.py
>>> gr_fir_ccf: using SSE
Traceback (most recent call last):
File "./bbn_80211b_test.py", line 120, in <module>
  main()
File "./bbn_80211b_test.py", line 101, in main
  tb = my_block(rx_callback, options.spb, options.alpha, options.snr)
File "./bbn_80211b_test.py", line 53, in __init__
  self.packet_transmitter = bbn_80211b_mod_pkts(spb=spb, alpha=alpha, 
gain=1)
File "/root/usrp2_version/gr-bbn/src/examples/bbn_80211b_pkt.py", line 
67, in __init__
  self.xpsk_mod = bbn_80211b.bbn_80211b_mod(*args, **kwargs)
File "/root/usrp2_version/gr-bbn/src/examples/bbn_80211b.py", line 95, 
in __init__
  gr.hier_block2.__init__(self, "bbn_80211b", gr.io_signature(1, 1, 
gr.sizeof_char), gr.io_signature(1, 2, gr.sizeof_gr_complex))
File 
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/hier_block2.py", 
line 42, in __init__
  self._hb = hier_block2_swig(name, input_signature, output_signature)
File 
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_runtime.py", 
line 1009, in hier_block2_swig
  return _gnuradio_swig_py_runtime.hier_block2_swig(*args, **kwargs)
RuntimeError: Hierarchical blocks do not yet support arbitrary or 
variable numbers of inputs or outputs (bbn_80211b)

do you have any idea about the origin of this problem? Thank you in 
advance.