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Diffstat (limited to 'gr-uhd/apps/uhd_rx_nogui.py')
| -rwxr-xr-x | gr-uhd/apps/uhd_rx_nogui.py | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/gr-uhd/apps/uhd_rx_nogui.py b/gr-uhd/apps/uhd_rx_nogui.py new file mode 100755 index 000000000..6f860b820 --- /dev/null +++ b/gr-uhd/apps/uhd_rx_nogui.py @@ -0,0 +1,233 @@ +#!/usr/bin/env python +# +# Copyright 2006,2007,2011 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, gru, uhd, optfir, audio, blks2 +from gnuradio import eng_notation +from gnuradio.eng_option import eng_option +from optparse import OptionParser +import sys + +""" +This example application demonstrates receiving and demodulating +different types of signals using the USRP. + +A receive chain is built up of the following signal processing +blocks: + +USRP - Daughter board source generating complex baseband signal. +CHAN - Low pass filter to select channel bandwidth +RFSQL - RF squelch zeroing output when input power below threshold +AGC - Automatic gain control leveling signal at [-1.0, +1.0] +DEMOD - Demodulation block appropriate to selected signal type. + This converts the complex baseband to real audio frequencies, + and applies an appropriate low pass decimating filter. +CTCSS - Optional tone squelch zeroing output when tone is not present. +RSAMP - Resampler block to convert audio sample rate to user specified + sound card output rate. +AUDIO - Audio sink for playing final output to speakers. + +The following are required command line parameters: + +-f FREQ USRP receive frequency +-m MOD Modulation type, select from AM, FM, or WFM + +The following are optional command line parameters: + +-R SUBDEV Daughter board specification, defaults to first found +-c FREQ Calibration offset. Gets added to receive frequency. + Defaults to 0.0 Hz. +-g GAIN Daughterboard gain setting. Defaults to mid-range. +-o RATE Sound card output rate. Defaults to 32000. Useful if + your sound card only accepts particular sample rates. +-r RFSQL RF squelch in db. Defaults to -50.0. +-p FREQ CTCSS frequency. Opens squelch when tone is present. + +Once the program is running, ctrl-break (Ctrl-C) stops operation. + +Please see fm_demod.py and am_demod.py for details of the demodulation +blocks. +""" + +# (device_rate, channel_rate, audio_rate, channel_pass, channel_stop, demod) +demod_params = { + 'AM' : (256e3, 16e3, 16e3, 5000, 8000, blks2.demod_10k0a3e_cf), + 'FM' : (256e3, 32e3, 8e3, 8000, 9000, blks2.demod_20k0f3e_cf), + 'WFM' : (320e3, 320e3, 32e3, 80000, 115000, blks2.demod_200kf3e_cf) + } + +class uhd_src(gr.hier_block2): + """ + Create a UHD source object supplying complex floats. + + Selects user supplied subdevice or chooses first available one. + + Calibration value is the offset from the tuned frequency to + the actual frequency. + """ + def __init__(self, address, samp_rate, gain=None, calibration=0.0): + gr.hier_block2.__init__(self, "uhd_src", + gr.io_signature(0, 0, 0), # Input signature + gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature + + self._src = uhd.usrp_source(device_addr=address, + io_type=uhd.io_type.COMPLEX_FLOAT32, + num_channels=1) + + self._src.set_samp_rate(samp_rate) + dev_rate = self._src.get_samp_rate() + self._samp_rate = samp_rate + + # Resampler to get to exactly samp_rate no matter what dev_rate is + self._rrate = samp_rate / dev_rate + self._resamp = blks2.pfb_arb_resampler_ccf(self._rrate) + + # If no gain specified, set to midrange + if gain is None: + g = self._src.get_gain_range() + gain = (g.start()+g.stop())/2.0 + print "Using gain: ", gain + self._src.set_gain(gain) + + self._cal = calibration + self.connect(self._src, self._resamp, self) + + def tune(self, freq): + r = self._src.set_center_freq(freq+self._cal, 0) + + def rate(self): + return self._samp_rate + +class app_top_block(gr.top_block): + def __init__(self, options): + gr.top_block.__init__(self) + self.options = options + + (dev_rate, channel_rate, audio_rate, + channel_pass, channel_stop, demod) = demod_params[options.modulation] + + DEV = uhd_src(options.address, # UHD device address + dev_rate, # device sample rate + options.gain, # Receiver gain + options.calibration) # Frequency offset + DEV.tune(options.frequency) + + if_rate = DEV.rate() + channel_decim = int(if_rate // channel_rate) + audio_decim = int(channel_rate // audio_rate) + + CHAN_taps = optfir.low_pass(1.0, # Filter gain + if_rate, # Sample rate + channel_pass, # One sided modulation bandwidth + channel_stop, # One sided channel bandwidth + 0.1, # Passband ripple + 60) # Stopband attenuation + + CHAN = gr.freq_xlating_fir_filter_ccf(channel_decim, # Decimation rate + CHAN_taps, # Filter taps + 0.0, # Offset frequency + if_rate) # Sample rate + + RFSQL = gr.pwr_squelch_cc(options.rf_squelch, # Power threshold + 125.0/channel_rate, # Time constant + int(channel_rate/20), # 50ms rise/fall + False) # Zero, not gate output + + AGC = gr.agc_cc(1.0/channel_rate, # Time constant + 1.0, # Reference power + 1.0, # Initial gain + 1.0) # Maximum gain + + DEMOD = demod(channel_rate, audio_decim) + + # From RF to audio + #self.connect(DEV, CHAN, RFSQL, AGC, DEMOD) + self.connect(DEV, CHAN, DEMOD) + + # Optionally add CTCSS and RSAMP if needed + tail = DEMOD + if options.ctcss != None and options.ctcss > 60.0: + CTCSS = gr.ctcss_squelch_ff(audio_rate, # Sample rate + options.ctcss) # Squelch tone + self.connect(DEMOD, CTCSS) + tail = CTCSS + + if options.output_rate != audio_rate: + out_lcm = gru.lcm(audio_rate, options.output_rate) + out_interp = int(out_lcm // audio_rate) + out_decim = int(out_lcm // options.output_rate) + RSAMP = blks2.rational_resampler_fff(out_interp, out_decim) + self.connect(tail, RSAMP) + tail = RSAMP + + # Send to audio output device + AUDIO = audio.sink(int(options.output_rate), + options.audio_output) + self.connect(tail, AUDIO) + +def main(): + 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 [default=%default]") + parser.add_option("-f", "--frequency", type="eng_float", + default=None, metavar="Hz", + help="set receive frequency to Hz [default=%default]") + parser.add_option("-c", "--calibration", type="eng_float", + default=0.0, metavar="Hz", + help="set frequency offset to Hz [default=%default]") + parser.add_option("-g", "--gain", type="int", + metavar="dB", default=None, + help="set RF gain [default is midpoint]") + parser.add_option("-m", "--modulation", type="choice", choices=('AM','FM','WFM'), + metavar="TYPE", default=None, + help="set modulation type (AM,FM) [default=%default]") + parser.add_option("-o", "--output-rate", type="eng_float", + default=32000, metavar="RATE", + help="set audio output rate to RATE [default=%default]") + parser.add_option("-r", "--rf-squelch", type="eng_float", + default=-50.0, metavar="dB", + help="set RF squelch to dB [default=%default]") + parser.add_option("-p", "--ctcss", type="float", + default=None, metavar="FREQ", + help="set CTCSS squelch to FREQ [default=%default]") + parser.add_option("-O", "--audio-output", type="string", default="", + help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp") + (options, args) = parser.parse_args() + + if options.frequency is None: + sys.stderr.write("Must supply receive frequency with -f.\n") + sys.exit(1) + + if options.modulation is None: + sys.stderr.write("Must supply a modulation type (AM, FM, WFM).\n") + sys.exit(1) + + tb = app_top_block(options) + try: + tb.run() + except KeyboardInterrupt: + pass + +if __name__ == "__main__": + main() |