[Discuss-gnuradio] Problems with USRP

[Anastasopoulos Achilleas]

Dear all,

I received the USRP, followed the WiKi instruction and
it seems to be working since I get meaningful result when I run
test_usrp_standard_tx and test_usrp_standard_rx.

I have also updated my gnuradio installation using
tarballs 2.5

However I have problems running any of the python
scripts on gnuradio-examples that involve the USRP.

I have sanitized one of the scripts and it works fine when I
comment out the
from gnuradio import usrp
line
but it gives an error otherwise.

I attach the simple script and error message.

Any idea as to what might be wrong?

Thanks
Achilleas


===================================================
#!/usr/bin/env python

from gnuradio import gr

from gnuradio.wxgui import stdgui, fftsink
import wx

#from gnuradio import usrp

class nbfm_rx_graph (stdgui.gui_flow_graph):
    def __init__(self,frame,panel,vbox,argv):
        stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)

        src = gr.sig_source_c (256e3, gr.GR_SIN_WAVE, 20e3, 1e1)

        usrp_fft, fft_win1 = \
                  fftsink.make_fft_sink_c (self, panel, "USRP Output",
512,
                                           256e3, 0, 100)
        self.connect (src, usrp_fft)
        vbox.Add (fft_win1, 1, wx.EXPAND)

def main():
    app = stdgui.stdapp (nbfm_rx_graph, "NBFM RX")
    app.MainLoop ()

if __name__ == '__main__':
    main()

===================================================

Traceback (most recent call last):
  File "./test2.py", line 29, in ?
    main()
  File "./test2.py", line 25, in main
    app = stdgui.stdapp (nbfm_rx_graph, "NBFM RX")
  File "/usr/local/lib/python2.3/site-packages/gnuradio/wxgui/stdgui.py",
line 35, in __init__
    wx.App.__init__ (self)
  File "/usr/lib/python2.3/site-packages/wx-2.5.3-gtk-ansi/wx/_core.py",
line 5301, in __init__
    self._BootstrapApp()
  File "/usr/lib/python2.3/site-packages/wx-2.5.3-gtk-ansi/wx/_core.py",
line 4980, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File "/usr/local/lib/python2.3/site-packages/gnuradio/wxgui/stdgui.py",
line 38, in OnInit
    frame = stdframe (self.flow_graph_maker, self.title)
  File "/usr/local/lib/python2.3/site-packages/gnuradio/wxgui/stdgui.py",
line 59, in __init__
    self.panel = stdpanel (self, self, flow_graph_maker)
  File "/usr/local/lib/python2.3/site-packages/gnuradio/wxgui/stdgui.py",
line 85, in __init__
    self.fg.start ()
  File "/usr/local/lib/python2.3/site-packages/gnuradio/gr/flow_graph.py",
line 73, in start
    self.scheduler = scheduler (self)
  File "/usr/local/lib/python2.3/site-packages/gnuradio/gr/scheduler.py",
line 49, in __init__
    sts = single_threaded_scheduler (list_of_blocks)
  File
"/usr/local/lib/python2.3/site-packages/gnuradio/gr/gnuradio_swig_python.py",
line 1484, in single_threaded_scheduler
    return _gnuradio_swig_python.single_threaded_scheduler(*args)
TypeError: argument number 1: a 'gr_block_sptr' is expected,
'gr_block_sptrPtr(<gr_block sig_source_c (0)>)' is received in sequence
element 0

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