3 # Copyright 2004,2005,2007,2008,2009 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 3, 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.
24 Read samples from the USRP2 and write to file formatted as binary
25 outputs single precision complex float values or complex short values
26 (interleaved 16 bit signed short integers).
29 from gnuradio import gr, eng_notation
30 from gnuradio import usrp2
31 from gnuradio.eng_option import eng_option
32 from optparse import OptionParser
35 n2s = eng_notation.num_to_str
37 class rx_cfile_block(gr.top_block):
39 def __init__(self, options, filename):
40 gr.top_block.__init__(self)
42 # Create a USRP2 source
43 if options.output_shorts:
44 self._u = usrp2.source_16sc(options.interface, options.mac_addr)
45 self._sink = gr.file_sink(gr.sizeof_short*2, filename)
47 self._u = usrp2.source_32fc(options.interface, options.mac_addr)
48 self._sink = gr.file_sink(gr.sizeof_gr_complex, filename)
50 # Set receiver decimation rate
51 self._u.set_decim(options.decim)
53 # Set receive daughterboard gain
54 if options.gain is None:
55 g = self._u.gain_range()
56 options.gain = float(g[0]+g[1])/2
57 print "Using mid-point gain of", options.gain, "(", g[0], "-", g[1], ")"
58 self._u.set_gain(options.gain)
60 # Set receive frequency
61 if options.lo_offset is not None:
62 self._u.set_lo_offset(options.lo_offset)
64 tr = self._u.set_center_freq(options.freq)
66 sys.stderr.write('Failed to set center frequency\n')
69 # Create head block if needed and wire it up
70 if options.nsamples is None:
71 self.connect(self._u, self._sink)
73 if options.output_shorts:
74 self._head = gr.head(gr.sizeof_short*2, int(options.nsamples))
76 self._head = gr.head(gr.sizeof_gr_complex, int(options.nsamples))
78 self.connect(self._u, self._head, self._sink)
80 input_rate = self._u.adc_rate()/self._u.decim()
83 print "Network interface:", options.interface
84 print "USRP2 address:", self._u.mac_addr()
85 print "Using RX d'board id 0x%04X" % (self._u.daughterboard_id(),)
86 print "Rx gain:", options.gain
87 print "Rx baseband frequency:", n2s(tr.baseband_freq)
88 print "Rx DDC frequency:", n2s(tr.dxc_freq)
89 print "Rx residual frequency:", n2s(tr.residual_freq)
90 print "Rx decimation rate:", options.decim
91 print "Rx sample rate:", n2s(input_rate)
92 if options.nsamples is None:
93 print "Receiving samples until Ctrl-C"
95 print "Receving", n2s(options.nsamples), "samples"
96 if options.output_shorts:
97 print "Writing 16-bit complex shorts"
99 print "Writing 32-bit complex floats"
100 print "Output filename:", filename
103 usage="%prog: [options] output_filename"
104 parser = OptionParser(option_class=eng_option, usage=usage)
105 parser.add_option("-e", "--interface", type="string", default="eth0",
106 help="use specified Ethernet interface [default=%default]")
107 parser.add_option("-m", "--mac-addr", type="string", default="",
108 help="use USRP2 at specified MAC address [default=None]")
109 parser.add_option("-d", "--decim", type="int", default=16,
110 help="set fgpa decimation rate to DECIM [default=%default]")
111 parser.add_option("-f", "--freq", type="eng_float", default=None,
112 help="set frequency to FREQ", metavar="FREQ")
113 parser.add_option("-g", "--gain", type="eng_float", default=None,
114 help="set gain in dB (default is midpoint)")
115 parser.add_option( "-s","--output-shorts", action="store_true", default=False,
116 help="output interleaved shorts instead of complex floats")
117 parser.add_option("-N", "--nsamples", type="eng_float", default=None,
118 help="number of samples to collect [default=+inf]")
119 parser.add_option("-v", "--verbose", action="store_true", default=False,
120 help="verbose output")
121 parser.add_option("", "--lo-offset", type="eng_float", default=None,
122 help="set daughterboard LO offset to OFFSET [default=hw default]")
124 (options, args) = parser.parse_args ()
129 if options.freq is None:
131 sys.stderr.write('You must specify the frequency with -f FREQ\n');
134 return (options, args[0])
137 if __name__ == '__main__':
138 (options, filename) = get_options()
139 tb = rx_cfile_block(options, filename)
143 except KeyboardInterrupt: