From 7dc08ba2875c0dace0432cd514add6ce2b085f44 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Tue, 3 Apr 2012 11:35:35 -0400
Subject: examples: Reworked locations and installation of examples.
All python and GRC examples directly associated with a top-level component are now in that examples directory. Examples are split into c++, python, and grc dirs but are all installed into $prefix/share/gnuradio/examples/<component>.
---
gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py | 154 ++++++++++++++++++++++++++
1 file changed, 154 insertions(+)
create mode 100755 gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py
(limited to 'gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py')
diff --git a/gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py b/gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py
new file mode 100755
index 000000000..b70334f30
--- /dev/null
+++ b/gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py
@@ -0,0 +1,154 @@
+#!/usr/bin/env python
+#
+# Copyright 2005-2007,2011 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, optfir, audio, blks2, uhd
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+import sys
+import math
+
+class wfm_rx_block (gr.top_block):
+
+ def __init__(self):
+ gr.top_block.__init__(self)
+
+ parser=OptionParser(option_class=eng_option)
+ parser.add_option("-a", "--args", type="string", default="",
+ help="UHD device address args [default=%default]")
+ parser.add_option("", "--spec", type="string", default="A:0 A:0",
+ help="Subdevice of UHD device where appropriate")
+ parser.add_option("-A", "--antenna", type="string", default=None,
+ help="select Rx Antenna where appropriate")
+ parser.add_option("", "--f1", type="eng_float", default=100.7e6,
+ help="set 1st station frequency to FREQ", metavar="FREQ")
+ parser.add_option("", "--f2", type="eng_float", default=102.5e6,
+ help="set 2nd station freq to FREQ", metavar="FREQ")
+ parser.add_option("-g", "--gain", type="eng_float", default=40,
+ help="set gain in dB (default is midpoint)")
+ parser.add_option("-O", "--audio-output", type="string", default="",
+ help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
+ parser.add_option("", "--freq-min", type="eng_float", default=87.9e6,
+ help="Set a minimum frequency [default=%default]")
+ parser.add_option("", "--freq-max", type="eng_float", default=108.1e6,
+ help="Set a maximum frequency [default=%default]")
+
+ (options, args) = parser.parse_args()
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ if abs(options.f1 - options.f2) > 5.5e6:
+ print "Sorry, two stations must be within 5.5MHz of each other"
+ raise SystemExit
+
+ f = (options.f1, options.f2)
+
+ self.vol = .1
+ self.state = "FREQ"
+
+ self.fm_freq_min = options.freq_min
+ self.fm_freq_max = options.freq_max
+
+ # build graph
+ stream_args = uhd.stream_args('fc32', channels=range(2))
+ self.u = uhd.usrp_source(device_addr=options.args, stream_args=stream_args)
+
+ # Set front end channel mapping
+ self.u.set_subdev_spec(options.spec)
+
+ usrp_rate = 320e3
+ demod_rate = 320e3
+ audio_rate = 32e3
+ audio_decim = int(demod_rate / audio_rate)
+
+ self.u.set_samp_rate(usrp_rate)
+ dev_rate = self.u.get_samp_rate()
+
+ # Make sure dboard can suppor the required frequencies
+ frange = self.u.get_freq_range()
+ if(frange.start() > self.fm_freq_max or frange.stop() < self.fm_freq_min):
+ sys.stderr.write("Radio does not support required frequency range.\n")
+ sys.exit(1)
+
+ # sound card as final sink
+ self.audio_sink = audio.sink(int(audio_rate), options.audio_output)
+
+ # taps for channel filter
+ nfilts = 32
+ chan_coeffs = optfir.low_pass (nfilts, # gain
+ nfilts*usrp_rate, # sampling rate
+ 80e3, # passband cutoff
+ 115e3, # stopband cutoff
+ 0.1, # passband ripple
+ 60) # stopband attenuation
+ rrate = usrp_rate / dev_rate
+
+ # set front end PLL to middle frequency
+ mid_freq = (f[0] + f[1]) / 2.0
+
+ 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())/2.0
+
+ for n in range(2):
+ chan_filt = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs, nfilts)
+ guts = blks2.wfm_rcv (demod_rate, audio_decim)
+ volume_control = gr.multiply_const_ff(self.vol)
+
+ #self.connect((self.di, n), chan_filt)
+ self.connect((self.u, n), chan_filt)
+ self.connect(chan_filt, guts, volume_control)
+ self.connect(volume_control, (self.audio_sink, n))
+
+ # Test the the requested frequencies are in range
+ if(f[n] < self.fm_freq_min or f[n] > self.fm_freq_max):
+ sys.stderr.write("Requested frequency is outside of required frequency range.\n")
+ sys.exit(1)
+
+ # Tune each channel by setting the RF freq to mid_freq and the
+ # DDC freq to f[n].
+ tr = uhd.tune_request(f[n], rf_freq=mid_freq,
+ rf_freq_policy=uhd.tune_request.POLICY_MANUAL)
+ self.u.set_center_freq(tr, n)
+
+ # Set gain for each channel
+ self.set_gain(options.gain, n)
+
+ # Set the antenna
+ if(options.antenna):
+ self.u.set_antenna(options.antenna, n)
+
+ def set_vol (self, vol):
+ self.vol = vol
+ self.volume_control.set_k(self.vol)
+
+
+ def set_gain(self, gain, n):
+ self.u.set_gain(gain, n)
+
+if __name__ == '__main__':
+ tb = wfm_rx_block()
+ try:
+ tb.run()
+ except KeyboardInterrupt:
+ pass
--
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