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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
#!/usr/bin/env python
#
# Copyright 2006, 2007 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, blks2
from gnuradio import msdd
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import struct, sys
# from current dir
from receive_path import receive_path
class my_top_block(gr.top_block):
def __init__(self, address, callback, options):
gr.top_block.__init__(self)
self._address = address
self._rx_freq = options.rx_freq # receiver's center frequency
self._rx_gain = options.rx_gain # receiver's gain
self._decim = options.decim # Decimating rate for the USRP (prelim)
if self._rx_freq is None:
sys.stderr.write("-f FREQ or --freq FREQ or --rx-freq FREQ must be specified\n")
raise SystemExit
# Set up USRP source
self._setup_source()
#taps = gr.firdes.low_pass(1, 1, 0.4, 0.2)
#self.resample = gr.rational_resampler_base_ccf(5, 8, taps)
self.resample = blks2.rational_resampler_ccf(5, 8)
# Set up receive path
self.rxpath = receive_path(callback, options)
self.connect(self.src, self.resample, self.rxpath)
#self.connect(self.src, gr.file_sink(gr.sizeof_gr_complex, "receive.dat"))
#self.connect(self.resample, gr.file_sink(gr.sizeof_gr_complex, "resampled.dat"))
def _setup_source(self):
# build graph
self._port = 10001
self.src = msdd.source_c(0, 1, self._address, self._port)
self.src.set_decim_rate(self._decim)
self.src.set_desired_packet_size(0, 1460)
self.set_gain(self._rx_gain)
self.set_freq(self._rx_freq)
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rypte: bool
"""
r = self.src.set_rx_freq(0, target_freq)
if r:
return True
return False
def set_gain(self, gain):
"""
Sets the analog gain in the USRP
"""
return self.src.set_pga(0, gain)
def decim(self):
return self._decim
def add_options(normal, expert):
"""
Adds usrp-specific options to the Options Parser
"""
add_freq_option(normal)
normal.add_option("", "--rx-gain", type="eng_float", default=32, metavar="GAIN",
help="set receiver gain in dB [default=%default].")
normal.add_option("-v", "--verbose", action="store_true", default=False)
expert.add_option("", "--rx-freq", type="eng_float", default=None,
help="set Rx frequency to FREQ [default=%default]", metavar="FREQ")
expert.add_option("-d", "--decim", type="intx", default=128,
help="set fpga decimation rate to DECIM [default=%default]")
expert.add_option("", "--snr", type="eng_float", default=30,
help="set the SNR of the channel in dB [default=%default]")
# Make a static method to call before instantiation
add_options = staticmethod(add_options)
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")
# /////////////////////////////////////////////////////////////////////////////
# main
# /////////////////////////////////////////////////////////////////////////////
def main():
global n_rcvd, n_right
n_rcvd = 0
n_right = 0
def rx_callback(ok, payload):
global n_rcvd, n_right
n_rcvd += 1
(pktno,) = struct.unpack('!H', payload[0:2])
if ok:
n_right += 1
print "ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d" % (ok, pktno, n_rcvd, n_right)
if 0:
printlst = list()
for x in payload[2:]:
t = hex(ord(x)).replace('0x', '')
if(len(t) == 1):
t = '0' + t
printlst.append(t)
printable = ''.join(printlst)
print printable
print "\n"
usage = "usage: %prog [options] host"
parser = OptionParser(usage=usage, option_class=eng_option, conflict_handler="resolve")
expert_grp = parser.add_option_group("Expert")
parser.add_option("","--discontinuous", action="store_true", default=False,
help="enable discontinuous")
my_top_block.add_options(parser, expert_grp)
receive_path.add_options(parser, expert_grp)
blks2.ofdm_mod.add_options(parser, expert_grp)
blks2.ofdm_demod.add_options(parser, expert_grp)
(options, args) = parser.parse_args ()
address = args[0]
# build the graph
tb = my_top_block(address, rx_callback, options)
#r = gr.enable_realtime_scheduling()
#if r != gr.RT_OK:
# print "Warning: failed to enable realtime scheduling"
tb.start() # start flow graph
tb.wait() # wait for it to finish
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
|
