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#!/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, blks2, pager
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import sys
class app_top_block(gr.top_block):
def __init__(self, options, queue):
gr.top_block.__init__(self, "usrp_flex_all")
if options.from_file is not None:
self.u = gr.file_source(gr.sizeof_gr_complex, options.from_file)
if options.verbose:
print "Reading samples from file", options.from_file
else:
# Set up USRP source
self.u = uhd.usrp_source(device_addr=options.address, stream_args=uhd.stream_args('fc32'))
# Grab 1 MHz of spectrum
# (A UHD facility to get sample rate range and granularity would be useful)
self.u.set_samp_rate(1e6)
rate = self.u.get_samp_rate()
if rate != 1e6:
print "Unable to set required sample rate of 1 Msps (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)
taps = gr.firdes.low_pass(1.0,
1.0,
1.0/40.0*0.4,
1.0/40.0*0.1,
gr.firdes.WIN_HANN)
if options.verbose:
print "Channel filter has", len(taps), "taps"
bank = blks2.analysis_filterbank(40, taps)
self.connect(self.u, bank)
if options.log and options.from_file == None:
src_sink = gr.file_sink(gr.sizeof_gr_complex, 'usrp.dat')
self.connect(self.u, src_sink)
for i in range(40):
if i < 20:
freq = options.freq+i*25e3
else:
freq = options.freq-0.5e6+(i-20)*25e3
self.connect((bank, i), pager.flex_demod(queue, freq, options.verbose, options.log))
if options.log:
self.connect((bank, i), gr.file_sink(gr.sizeof_gr_complex, 'chan_'+'%3.3f'%(freq/1e6)+'.dat'))
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_band.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()
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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