diff options
Diffstat (limited to 'gr-uhd/examples/python/usrp_wfm_rcv_nogui.py')
| -rwxr-xr-x | gr-uhd/examples/python/usrp_wfm_rcv_nogui.py | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/gr-uhd/examples/python/usrp_wfm_rcv_nogui.py b/gr-uhd/examples/python/usrp_wfm_rcv_nogui.py new file mode 100755 index 000000000..f0195bcb5 --- /dev/null +++ b/gr-uhd/examples/python/usrp_wfm_rcv_nogui.py @@ -0,0 +1,175 @@ +#!/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 import eng_notation +from gnuradio.eng_option import eng_option +from optparse import OptionParser +import sys + +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=None, + 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("-f", "--freq", type="eng_float", default=100.1e6, + 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("-V", "--volume", type="eng_float", default=None, + help="set volume (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) + + self.state = "FREQ" + self.freq = 0 + + self.fm_freq_min = options.freq_min + self.fm_freq_max = options.freq_max + + # build graph + self.u = uhd.usrp_source(device_addr=options.args, stream_args=uhd.stream_args('fc32')) + + # Set the subdevice spec + if(options.spec): + self.u.set_subdev_spec(options.spec, 0) + + # Set the antenna + if(options.antenna): + self.u.set_antenna(options.antenna, 0) + + 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() + + 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 + self.chan_filt = blks2.pfb_arb_resampler_ccf(rrate, chan_coeffs, nfilts) + + self.guts = blks2.wfm_rcv (demod_rate, audio_decim) + + self.volume_control = gr.multiply_const_ff(1) + + # sound card as final sink + self.audio_sink = audio.sink(int(audio_rate), + options.audio_output, + False) # ok_to_block + + # now wire it all together + self.connect (self.u, self.chan_filt, self.guts, + self.volume_control, self.audio_sink) + + 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 + + if options.volume is None: + g = self.volume_range() + options.volume = float(g[0]+g[1])/2 + + 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) + if(options.freq < self.fm_freq_min or options.freq > self.fm_freq_max): + sys.stderr.write("Requested frequency is outside of required frequency range.\n") + sys.exit(1) + + # set initial values + self.set_gain(options.gain) + self.set_vol(options.volume) + if not(self.set_freq(options.freq)): + self._set_status_msg("Failed to set initial frequency") + + def set_vol (self, vol): + g = self.volume_range() + self.vol = max(g[0], min(g[1], vol)) + self.volume_control.set_k(10**(self.vol/10)) + self.update_status_bar () + + def set_freq(self, target_freq): + """ + Set the center frequency we're interested in. + + @param target_freq: frequency in Hz + @rypte: bool + """ + + r = self.u.set_center_freq(target_freq) + + if r: + self.freq = target_freq + self.update_status_bar() + self._set_status_msg("OK", 0) + return True + + self._set_status_msg("Failed", 0) + return False + + def set_gain(self, gain): + self.u.set_gain(gain) + + def update_status_bar (self): + msg = "Freq: %s Volume:%f Setting:%s" % ( + eng_notation.num_to_str(self.freq), self.vol, self.state) + self._set_status_msg(msg, 1) + + def _set_status_msg(self, msg, which=0): + print msg + + def volume_range(self): + return (-20.0, 0.0, 0.5) + + +if __name__ == '__main__': + tb = wfm_rx_block() + try: + tb.run() + except KeyboardInterrupt: + pass |