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#!/usr/bin/env python
#
# Copyright 2011 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 3, 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., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, eng_notation
from gnuradio import uhd
from gnuradio.eng_option import eng_option
from gnuradio import eng_notation
from gnuradio import optfir
from optparse import OptionParser
from gnuradio.wxgui import stdgui2, fftsink2, waterfallsink2
from gnuradio.wxgui import scopesink2, form, slider
import wx
import time
import os.path
import sys
# required FPGA that can do 4 rx channels.
class my_graph(stdgui2.std_top_block):
def __init__(self, frame, panel, vbox, argv):
stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
self.frame = frame
self.panel = panel
parser = OptionParser (option_class=eng_option)
parser.add_option("-a", "--address", type="string",
default="addr=192.168.10.2",
help="Address of UHD device, [default=%default]")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("-s", "--samp-rate", type="eng_float", default=1e6,
help="set sample rate (bandwidth) [default=%default]")
parser.add_option("-f", "--freq", type="eng_float", default=None,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set gain in dB (default is midpoint)")
parser.add_option("-F", "--filter", action="store_true", default=True,
help="Enable channel filter")
parser.add_option("-N", "--nchans", type="int", default=1,
help="set number of channels (default=%default)")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
raise SystemExit
self.nchans = options.nchans
if options.filter:
sw_decim = 4
else:
sw_decim = 1
self.u = uhd.usrp_source(device_addr=options.address,
io_type=uhd.io_type.COMPLEX_FLOAT32,
num_channels=self.nchans)
self.u.set_samp_rate(options.samp_rate)
input_rate = self.u.get_samp_rate()
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.u.get_gain_range()
options.gain = float(g.start()+g.stop())/2
if options.freq is None:
# if no freq was specified, use the mid-point
r = self.u.get_freq_range()
options.freq = float(r.start()+r.stop())/2
self.set_gain(options.gain)
self.set_freq(options.freq)
#if self.u.nddcs() < nchan:
# sys.stderr.write('This code requires an FPGA build with %d DDCs. This FPGA has only %d.\n' % (
# nchan, self.u.nddcs()))
# raise SystemExit
#if (len (self.subdev) < 4 or
# self.u.db(0, 0).dbid() != usrp_dbid.BASIC_RX or
# self.u.db(0, 0).dbid() != usrp_dbid.BASIC_RX):
# sys.stderr.write('This code requires a Basic Rx board on Sides A & B\n')
# sys.exit(1)
# deinterleave four channels from FPGA
di = gr.deinterleave(gr.sizeof_gr_complex)
self.connect(self.u, di)
# taps for channel filter
chan_filt_coeffs = optfir.low_pass (1, # gain
input_rate, # sampling rate
80e3, # passband cutoff
115e3, # stopband cutoff
0.1, # passband ripple
60) # stopband attenuation
#print len(chan_filt_coeffs)
for i in range(self.nchans):
scope = fftsink2.fft_sink_c(panel, sample_rate=input_rate/sw_decim,
title="Input %d" % (i,),
ref_level=80, y_per_div=20)
vbox.Add(scope.win, 10, wx.EXPAND)
if options.filter:
chan_filt = gr.fir_filter_ccf(sw_decim, chan_filt_coeffs)
self.connect((di, i), chan_filt, scope)
else:
self.connect((di, i), scope)
def set_gain(self, gain):
for i in range(self.nchans):
self.u.set_gain(gain, i)
def set_freq(self, target_freq):
for i in range(self.nchans):
r = self.u.set_center_freq(target_freq, 0)
if r:
return True
else:
print "set_freq: failed to set subdev[%d] freq to %f" % \
(i, target_freq)
return False
def main ():
app = stdgui2.stdapp(my_graph, "Multi Scope", nstatus=1)
app.MainLoop()
if __name__ == '__main__':
main ()
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