2 # Copyright 2009 Free Software Foundation, Inc.
4 # This file is part of GNU Radio
6 # GNU Radio is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 3, or (at your option)
11 # GNU Radio is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with GNU Radio; see the file COPYING. If not, write to
18 # the Free Software Foundation, Inc., 51 Franklin Street,
19 # Boston, MA 02110-1301, USA.
22 from gnuradio import gr
25 from pick_bitrate import pick_rx_bitrate
26 from gnuradio import eng_notation
28 def add_freq_option(parser):
30 Hackery that has the -f / --freq option set both tx_freq and rx_freq
32 def freq_callback(option, opt_str, value, parser):
33 parser.values.rx_freq = value
34 parser.values.tx_freq = value
36 if not parser.has_option('--freq'):
37 parser.add_option('-f', '--freq', type="eng_float",
38 action="callback", callback=freq_callback,
39 help="set Tx and/or Rx frequency to FREQ [default=%default]",
42 def add_options(parser, expert):
43 add_freq_option(parser)
44 usrp_options.add_rx_options(parser)
45 receive_path.receive_path.add_options(parser, expert)
46 expert.add_option("", "--rx-freq", type="eng_float", default=None,
47 help="set Rx frequency to FREQ [default=%default]", metavar="FREQ")
48 parser.add_option("-v", "--verbose", action="store_true", default=False)
50 class usrp_receive_path(gr.hier_block2):
52 def __init__(self, demod_class, rx_callback, options):
54 See below for what options should hold
56 gr.hier_block2.__init__(self, "usrp_receive_path",
57 gr.io_signature(0, 0, 0), # Input signature
58 gr.io_signature(0, 0, 0)) # Output signature
59 if options.rx_freq is None:
60 sys.stderr.write("-f FREQ or --freq FREQ or --rx-freq FREQ must be specified\n")
62 rx_path = receive_path.receive_path(demod_class, rx_callback, options)
63 for attr in dir(rx_path): #forward the methods
64 if not attr.startswith('_') and not hasattr(self, attr):
65 setattr(self, attr, getattr(rx_path, attr))
67 self._demod_class = demod_class
68 self._setup_usrp_source(options)
70 self.connect(self.u, rx_path)
72 def _setup_usrp_source(self, options):
73 self.u = usrp_options.create_usrp_source(options)
74 adc_rate = self.u.adc_rate()
76 print 'USRP Source:', self.u
77 (self._bitrate, self._samples_per_symbol, self._decim) = \
78 pick_rx_bitrate(options.bitrate, self._demod_class.bits_per_symbol(), \
79 options.samples_per_symbol, options.decim, adc_rate, \
80 self.u.get_decim_rates())
82 self.u.set_decim(self._decim)
84 if not self.u.set_center_freq(options.rx_freq):
85 print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(options.rx_freq))
86 raise ValueError, eng_notation.num_to_str(options.rx_freq)