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Diffstat (limited to 'gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py')
| -rwxr-xr-x | gr-uhd/examples/python/usrp_wfm_rcv2_nogui.py | 154 |
1 files changed, 154 insertions, 0 deletions
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..f7e72ae6f --- /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 |