Hi,
I started developing with GNU Radio a couple of weeks ago and have been
following the list for a while. I must thank Eric, Matt and everyone else for
all the time they are devoting to this project. Now with my problem...
I am trying to do something which should be pretty simple. I have started from
one of the examples provided with GNU Radio. I use the USRP as a source for
complex data. Then I use gr.complex_to_mag() to get the magnitude of the
signal. Finally I output it to the scope using scope_sink_f. What I get is a
single freezed frame on the scope and nothing after. It is probably a stupid
mistake on my side. The code is in attachment.
I am using GNU Radio release 2.8 as I don't have access to CVS on the system.
All the examples work well on my system. I tried the code on a basic and a
dbsrx daugtherboard.
Is there any additional documentation available for gr-wxgui?
Thanks for your help,
Louis
#!/usr/bin/env python
#
# Copyright 2004,2005 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
#
from gnuradio import gr, gru, blks
from gnuradio import usrp
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from gnuradio.wxgui import stdgui, fftsink, waterfallsink, scopesink, form, slider
from optparse import OptionParser
import wx
import sys
def pick_subdevice(u):
"""
The user didn't specify a subdevice on the command line.
If there's a daughterboard on A, select A.
If there's a daughterboard on B, select B.
Otherwise, select A.
"""
if u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no d'board or a problem
return (0, 0)
if u.db[1][0].dbid() >= 0:
return (1, 0)
return (0, 0)
class app_flow_graph(stdgui.gui_flow_graph):
def __init__(self, frame, panel, vbox, argv):
stdgui.gui_flow_graph.__init__(self)
self.frame = frame
self.panel = panel
self.show_debug_info = True
freq = 10e6
# build the graph
self.u = usrp.source_c(decim_rate=16)
rx_subdev_spec = pick_subdevice(self.u)
self.u.set_mux(usrp.determine_rx_mux_value(self.u, rx_subdev_spec))
# determine the daughterboard subdevice we're using
self.subdev = usrp.selected_subdev(self.u, rx_subdev_spec)
input_rate = self.u.adc_freq() / self.u.decim_rate()
c2m = gr.complex_to_mag()
self.connect(self.u, c2m)
self.scope = scopesink.scope_sink_f (self, panel, sample_rate = 4e6)
self.connect(c2m, self.scope)
self._build_gui(vbox)
if self.show_debug_info:
self.myform['decim'].set_value(self.u.decim_rate())
self.myform['[EMAIL PROTECTED]'].set_value(self.u.adc_freq() / self.u.decim_rate())
self.myform['dbname'].set_value(self.subdev.name())
self.myform['baseband'].set_value(0)
self.myform['ddc'].set_value(0)
if not(self.set_freq(freq)):
self._set_status_msg("Failed to set initial frequency")
def _set_status_msg(self, msg):
self.frame.GetStatusBar().SetStatusText(msg, 0)
def _build_gui(self, vbox):
def _form_set_freq(kv):
return self.set_freq(kv['freq'])
vbox.Add(self.scope.win, 10, wx.EXPAND)
# add control area at the bottom
self.myform = myform = form.form()
hbox = wx.BoxSizer(wx.HORIZONTAL)
hbox.Add((5,0), 0, 0)
myform['freq'] = form.float_field(
parent=self.panel, sizer=hbox, label="Center freq", weight=1,
callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
hbox.Add((5,0), 0, 0)
g = self.subdev.gain_range()
myform['gain'] = form.slider_field(parent=self.panel, sizer=hbox, label="Gain",
weight=3,
min=int(g[0]), max=int(g[1]),
callback=self.set_gain)
hbox.Add((5,0), 0, 0)
vbox.Add(hbox, 0, wx.EXPAND)
self._build_subpanel(vbox)
def _build_subpanel(self, vbox_arg):
# build a secondary information panel (sometimes hidden)
# FIXME figure out how to have this be a subpanel that is always
# created, but has its visibility controlled by foo.Show(True/False)
if not(self.show_debug_info):
return
panel = self.panel
vbox = vbox_arg
myform = self.myform
#panel = wx.Panel(self.panel, -1)
#vbox = wx.BoxSizer(wx.VERTICAL)
hbox = wx.BoxSizer(wx.HORIZONTAL)
hbox.Add((5,0), 0)
myform['decim'] = form.static_float_field(
parent=panel, sizer=hbox, label="Decim")
hbox.Add((5,0), 1)
myform['[EMAIL PROTECTED]'] = form.static_float_field(
parent=panel, sizer=hbox, label="[EMAIL PROTECTED]")
hbox.Add((5,0), 1)
myform['dbname'] = form.static_text_field(
parent=panel, sizer=hbox)
hbox.Add((5,0), 1)
myform['baseband'] = form.static_float_field(
parent=panel, sizer=hbox, label="Analog BB")
hbox.Add((5,0), 1)
myform['ddc'] = form.static_float_field(
parent=panel, sizer=hbox, label="DDC")
hbox.Add((5,0), 0)
vbox.Add(hbox, 0, wx.EXPAND)
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rypte: bool
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital down converter.
"""
r = self.u.tune(0, self.subdev, target_freq)
if r:
self.myform['freq'].set_value(target_freq) # update displayed value
if self.show_debug_info:
self.myform['baseband'].set_value(r.baseband_freq)
self.myform['ddc'].set_value(r.dxc_freq)
return True
return False
def set_gain(self, gain):
self.myform['gain'].set_value(gain) # update displayed value
self.subdev.set_gain(gain)
def main ():
app = stdgui.stdapp(app_flow_graph, "Mag test", nstatus=1)
app.MainLoop()
if __name__ == '__main__':
main ()
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