125 lines
4.4 KiB
Python
Executable File
125 lines
4.4 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Copyright 2011 Steve Glass.
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#
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# This file is part of GNU Radio and part of OP25
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# It is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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# License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import math
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import sys
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import wx
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from gnuradio import audio
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from gnuradio import eng_notation
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from gnuradio import gr
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from gnuradio import op25
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from gnuradio import op25_c4fm_mod
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from gnuradio import usrp
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from gnuradio.eng_option import eng_option
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"""
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Simple tx-from-pcap-file utility.
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"""
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class usrp_c4fm_tx_block(gr.top_block):
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def __init__(self, subdev_spec, freq, subdev_gain, filename, delay, repeat):
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gr.top_block.__init__ (self)
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# important vars (to be calculated from USRP when available
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dac_rate = 128e6
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usrp_interp = 400
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usrp_rate = dac_rate / usrp_interp # 320KS/s
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sw_interp = 10
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channel_rate = usrp_rate / sw_interp # 32 kS/s
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# open the pcap source
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pcap = op25.pcap_source_b(filename, delay, repeat)
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# ToDo: consider octet -> symbol unpacking in flow graph
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c4fm = op25_c4fm_mod.p25_mod(output_sample_rate=channel_rate, log=False, verbose=False)
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self.connect(pcap, c4fm)
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# setup low pass filter + interpolator
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interp_factor = self.usrp_rate / self.channel_rate
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low_pass = 2.88e3
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interp_taps = gr.firdes.low_pass(1.0, self.usrp_rate, low_pass, low_pass * 0.1, gr.firdes.WIN_HANN)
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interpolator = gr.interp_fir_filter_fff (int(interp_factor), interp_taps)
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self.connect(c4fm, interpolator)
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# frequency modulator
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max_dev = 12.5e3
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k = 2 * math.pi * max_dev / self.usrp_rate
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adjustment = 1.5 # adjust for proper c4fm deviation level
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fm = gr.frequency_modulator_fc(k * adjustment)
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self.connect(interpolator, fm)
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# amplify signal
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gain = gr.multiply_const_cc(4000)
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self.connect(fm, gain)
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# # configure USRP
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u = usrp.sink_c()
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if subdev_spec is None:
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subdev_spec = usrp.pick_tx_subdevice(u)
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u.set_mux(usrp.determine_tx_mux_value(u, subdev_spec))
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subdev = usrp.selected_subdev(u, subdev_spec)
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print "Using TX d'board %s" % (subdev.side_and_name(),)
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if gain is None:
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g = subdev.gain_range()
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gain = float(g[0] + g[1]) / 2
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subdev.set_gain(self.subdev.gain_range()[0])
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u.tune(subdev.which(), subdev, freq)
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self.connect(gain, u)
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subdev.set_enable(True)
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# sink = gr.null_sink(gr.sizeof_float)
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# self.connect(gain, sink)
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# inject frames
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#
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if __name__ == '__main__':
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from optparse import OptionParser
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parser = OptionParser (option_class=eng_option)
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parser.add_option("-T", "--tx-subdev-spec", type="subdev", default=None,
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help="select USRP Tx side A or B")
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parser.add_option("-f", "--freq", type="eng_float", default=None,
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help="set Tx frequency to FREQ [required]")
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parser.add_option("-g", "--gain", type="eng_float", default=None,
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help="set device gain")
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parser.add_option("-p", "--pcap-file", default="",
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help="packet capture file [required]")
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parser.add_option("-d", "--delay", type="int", default=0,
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help="delay before TX of first symbol [default=%default]")
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parser.add_option("-r","--repeat", action="store_true", default=False,
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help="continuously replay input file [default=%default]")
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(options, args) = parser.parse_args ()
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if options.freq is None:
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parser.print_help()
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sys.exit(1)
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try:
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rx = usrp_c4fm_tx_block(options.subdev_spec, options.freq, options.gain, options.pcap_file, options.delay, options.repeat)
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rx.run()
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except KeyboardInterrupt:
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rx.subdev.set_enable(False)
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