1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
#
# Copyright 2009 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
from gnuradio import usrp_options
import receive_path
from pick_bitrate import pick_rx_bitrate
from gnuradio import eng_notation
def add_freq_option(parser):
"""
Hackery that has the -f / --freq option set both tx_freq and rx_freq
"""
def freq_callback(option, opt_str, value, parser):
parser.values.rx_freq = value
parser.values.tx_freq = value
if not parser.has_option('--freq'):
parser.add_option('-f', '--freq', type="eng_float",
action="callback", callback=freq_callback,
help="set Tx and/or Rx frequency to FREQ [default=%default]",
metavar="FREQ")
def add_options(parser, expert):
add_freq_option(parser)
usrp_options.add_rx_options(parser)
receive_path.receive_path.add_options(parser, expert)
expert.add_option("", "--rx-freq", type="eng_float", default=None,
help="set Rx frequency to FREQ [default=%default]", metavar="FREQ")
parser.add_option("-v", "--verbose", action="store_true", default=False)
class usrp_receive_path(gr.hier_block2):
def __init__(self, demod_class, rx_callback, options):
'''
See below for what options should hold
'''
gr.hier_block2.__init__(self, "usrp_receive_path",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
if options.rx_freq is None:
sys.stderr.write("-f FREQ or --freq FREQ or --rx-freq FREQ must be specified\n")
raise SystemExit
#setup usrp
self._demod_class = demod_class
self._setup_usrp_source(options)
rx_path = receive_path.receive_path(demod_class, rx_callback, options)
for attr in dir(rx_path): #forward the methods
if not attr.startswith('_') and not hasattr(self, attr):
setattr(self, attr, getattr(rx_path, attr))
#connect
self.connect(self.u, rx_path)
def _setup_usrp_source(self, options):
self.u = usrp_options.create_usrp_source(options)
adc_rate = self.u.adc_rate()
self.rs_rate = options.bitrate
(self._bitrate, self._samples_per_symbol, self._decim) = \
pick_rx_bitrate(options.bitrate, self._demod_class.bits_per_symbol(), \
options.samples_per_symbol, options.decim,
adc_rate, self.u.get_decim_rates())
if options.verbose:
print 'USRP Source:', self.u
print 'Decimation: ', self._decim
options.samples_per_symbol = self._samples_per_symbol
options.decim = self._decim
self.u.set_decim(self._decim)
if not self.u.set_center_freq(options.rx_freq):
print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(options.rx_freq))
raise ValueError, eng_notation.num_to_str(options.rx_freq)
|
