/usr/bin/usrp_flex is in gnuradio 3.5.3.2-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #!/usr/bin/python
#!/usr/bin/env python
#
# Copyright 2006,2007,2009,2011 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, gru, uhd, optfir, eng_notation, pager
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import time, os, sys
class app_top_block(gr.top_block):
def __init__(self, options, queue):
gr.top_block.__init__(self, "usrp_flex")
self.options = options
self.offset = 0.0
self.adj_time = time.time()
self.verbose = options.verbose
if options.from_file is None:
# Set up USRP source
self.u = uhd.usrp_source(device_addr=options.address, stream_args=uhd.stream_args('fc32'))
# Grab 250 KHz of spectrum
# (A UHD facility to get sample rate range and granularity would be useful)
self.u.set_samp_rate(250e3)
rate = self.u.get_samp_rate()
if rate != 250e3:
print "Unable to set required sample rate of 250 Ksps (got %f)" % rate
sys.exit(1)
# Tune daughterboard
r = self.u.set_center_freq(options.freq+options.calibration, 0)
if not r:
frange = self.u.get_freq_range()
sys.stderr.write(("\nRequested frequency (%f) out or range [%f, %f]\n") % \
(freq, frange.start(), frange.stop()))
sys.exit(1)
# if no gain was specified, use the mid-point in dB
if options.rx_gain is None:
grange = self.u.get_gain_range()
options.rx_gain = float(grange.start()+grange.stop())/2.0
print "\nNo gain specified."
print "Setting gain to %f (from [%f, %f])" % \
(options.rx_gain, grange.start(), grange.stop())
self.u.set_gain(options.rx_gain, 0)
else:
# Use supplied file as source of samples
self.u = gr.file_source(gr.sizeof_gr_complex, options.from_file)
if options.verbose:
print "Reading samples from", options.from_file
if options.log and not options.from_file:
usrp_sink = gr.file_sink(gr.sizeof_gr_complex, 'usrp.dat')
self.connect(self.u, usrp_sink)
# Set up 22KHz-wide bandpass about center frequency. Decimate by 10
# to get channel rate of 25Ksps
taps = optfir.low_pass(1.0, # Filter gain
250e3, # Sample rate
11000, # One-sided modulation bandwidth
12500, # One-sided channel bandwidth
0.1, # Passband ripple
60) # Stopband attenuation
if options.verbose:
print "Channel filter has", len(taps), "taps."
self.chan = gr.freq_xlating_fir_filter_ccf(10, # Decimation rate
taps, # Filter taps
0.0, # Offset frequency
250e3) # Sample rate
if options.log:
chan_sink = gr.file_sink(gr.sizeof_gr_complex, 'chan.dat')
self.connect(self.chan, chan_sink)
# FLEX protocol demodulator
self.flex = pager.flex_demod(queue, options.freq, options.verbose, options.log)
self.connect(self.u, self.chan, self.flex)
def freq_offset(self):
return self.flex.dc_offset()*1600
def adjust_freq(self):
if time.time() - self.adj_time > 1.6: # Only do it once per FLEX frame
self.adj_time = time.time()
self.offset -= self.freq_offset()
self.chan.set_center_freq(self.offset)
if self.verbose:
print "Channel frequency offset (Hz):", int(self.offset)
def get_options():
parser = OptionParser(option_class=eng_option)
parser.add_option('-f', '--freq', type="eng_float", default=None,
help="Set receive frequency to FREQ [default=%default]",
metavar="FREQ")
parser.add_option("-a", "--address", type="string", default="addr=192.168.10.2",
help="Address of UHD device, [default=%default]")
parser.add_option("-A", "--antenna", type="string", default=None,
help="select Rx Antenna where appropriate")
parser.add_option("", "--rx-gain", type="eng_float", default=None,
help="set receive gain in dB (default is midpoint)")
parser.add_option("-c", "--calibration", type="eng_float", default=0.0,
help="set frequency offset to Hz", metavar="Hz")
parser.add_option("-v", "--verbose", action="store_true", default=False)
parser.add_option("-l", "--log", action="store_true", default=False,
help="log flowgraph to files (LOTS of data)")
parser.add_option("-F", "--from-file", default=None,
help="read samples from file instead of USRP")
(options, args) = parser.parse_args()
if len(args) > 0:
print "Run 'usrp_flex.py -h' for options."
sys.exit(1)
if (options.freq is None):
sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
sys.exit(1)
return (options, args)
if __name__ == "__main__":
(options, args) = get_options()
# Flow graph emits pages into message queue
queue = gr.msg_queue()
tb = app_top_block(options, queue)
runner = pager.queue_runner(queue)
try:
tb.run()
except KeyboardInterrupt:
pass
runner.end()
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