3 # Copyright 2007 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 2, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr, eng_notation
24 from gnuradio.eng_option import eng_option
25 from optparse import OptionParser
26 from usrp_sink import usrp_sink_c
27 from sounder_tx import sounder_tx
29 n2s = eng_notation.num_to_str
31 class usrp_sounder_tx(gr.hier_block2):
32 def __init__(self, subdev_spec, freq, cal, verbose, degree, chip_rate, amplitude):
34 # Call hierarchical block constructor
35 # Top-level blocks have no inputs or outputs
36 gr.hier_block2.__init__(self,
37 "usrp_sounder_tx", # Block typename
38 gr.io_signature(0,0,0), # Input signature
39 gr.io_signature(0,0,0)) # Output signature
43 self._verbose = verbose
45 self._length = 2**degree-1
46 self._amplitude = amplitude
48 self._u = usrp_sink_c(0, subdev_spec, chip_rate, self._freq, self._cal, self._verbose)
49 self.define_component("usrp", self._u)
50 self._chip_rate = self._u._if_rate
51 self._max_time = float(self._length)/self._chip_rate
52 self.define_component("pn", sounder_tx(self._degree, self._chip_rate, self._verbose))
53 self.define_component("gain", gr.multiply_const_ff(amplitude));
54 self.define_component("f2c", gr.float_to_complex())
57 print "Chip rate is", n2s(self._chip_rate), "chips/sec"
58 print "Resolution is", n2s(1.0/self._chip_rate), "sec"
59 print "Using PN code of degree", self._degree, "length", 2**self._degree-1
60 print "Maximum measurable impulse response is", n2s(self._max_time), "sec"
61 print "Output amplitude is", amplitude
63 # Ultimately this will be
64 # self.connect("pn gain f2c usrp")
65 self.connect("pn", 0, "gain", 0)
66 self.connect("gain", 0, "f2c", 0)
67 self.connect("f2c", 0, "usrp", 0)
70 parser = OptionParser(option_class=eng_option)
72 # Transmit path options
73 parser.add_option("-T", "--tx-subdev-spec", type="subdev", default=None,
74 help="select USRP Rx side A or B (default=first found)")
75 parser.add_option("-f", "--freq", type="eng_float", default=0.0,
76 help="set center frequency (default=%default)")
77 parser.add_option("-c", "--cal", type="eng_float", default=0.0,
78 help="set frequency calibration offset (default=%default)")
79 parser.add_option("-v", "--verbose", action="store_true", default=False,
80 help="print extra debugging info")
81 parser.add_option("-d", "--degree", type="int", default=10,
82 help="set PN code degree (length=2**degree-1, default=%default)")
83 parser.add_option("-r", "--chip-rate", type="eng_float", default=8e6,
84 help="set sounder chip rate (default=%default)")
85 parser.add_option("-g", "--amplitude", type="eng_float", default=8000.0,
86 help="set output amplitude (default=%default)")
87 parser.add_option("", "--real-time", action="store_true", default=False,
88 help="Attempt to enable real-time scheduling")
89 (options, args) = parser.parse_args()
95 if not options.real_time:
98 # Attempt to enable realtime scheduling
99 r = gr.enable_realtime_scheduling()
104 print "Note: failed to enable realtime scheduling"
106 # Create an instance of a hierarchical block
107 top_block = usrp_sounder_tx(options.tx_subdev_spec, options.freq, options.cal,
108 options.verbose, options.degree, options.chip_rate,
111 # Create an instance of a runtime, passing it the top block
113 runtime = gr.runtime(top_block)
118 except KeyboardInterrupt:
122 if __name__ == '__main__':