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#!/usr/bin/env python
#
# Copyright 2005 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 2, 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, blks
from gnuradio import usrp
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import random
import struct
# from current dir
from receive_path import receive_path
import fusb_options
#import os
#print os.getpid()
#raw_input('Attach and press enter')
class my_graph(gr.flow_graph):
def __init__(self, demod_class, rx_subdev_spec,
bitrate, decim_rate, spb,
rx_callback, options, demod_kwargs):
gr.flow_graph.__init__(self)
self.rxpath = receive_path(self, demod_class, rx_subdev_spec,
bitrate, decim_rate, spb,
rx_callback, options, demod_kwargs)
# /////////////////////////////////////////////////////////////////////////////
# main
# /////////////////////////////////////////////////////////////////////////////
global n_rcvd, n_right
def main():
global n_rcvd, n_right
n_rcvd = 0
n_right = 0
def rx_callback(ok, payload):
global n_rcvd, n_right
(pktno,) = struct.unpack('!H', payload[0:2])
n_rcvd += 1
if ok:
n_right += 1
print "ok = %r pktno = %4d n_rcvd = %4d n_right = %4d" % (
ok, pktno, n_rcvd, n_right)
parser = OptionParser (option_class=eng_option)
parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
help="select USRP Rx side A or B")
parser.add_option("-f", "--freq", type="eng_float", default=423.1e6,
help="set Rx frequency to FREQ [default=%default]",
metavar="FREQ")
parser.add_option("-r", "--bitrate", type="eng_float", default=None,
help="specify bitrate. spb and interp will be derived.")
parser.add_option("-g", "--rx-gain", type="eng_float", default=27,
help="set rx gain")
parser.add_option("-S", "--spb", type="int", default=None,
help="set samples/baud [default=%default]")
parser.add_option("-d", "--decim", type="intx", default=None,
help="set fpga decim rate to DECIM [default=%default]")
fusb_options.add_options(parser)
(options, args) = parser.parse_args ()
if len(args) != 0:
parser.print_help()
sys.exit(1)
if options.freq < 1e6:
options.freq *= 1e6
demod_kwargs = { } # placeholder
# build the graph
fg = my_graph(blks.gmsk2_demod,
options.rx_subdev_spec, options.bitrate,
options.decim, options.spb, rx_callback,
options, demod_kwargs)
print "bitrate: %sb/sec" % (eng_notation.num_to_str(fg.rxpath.bitrate()),)
print "spb: %3d" % (fg.rxpath.spb(),)
print "decim: %3d" % (fg.rxpath.decim(),)
ok = fg.rxpath.set_freq(options.freq)
if not ok:
print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(options.freq),)
raise SystemExit
fg.rxpath.set_gain(options.rx_gain)
print "Rx gain_range: ", fg.rxpath.subdev.gain_range(), " using", fg.rxpath.gain
r = gr.enable_realtime_scheduling()
if r != gr.RT_OK:
print "Warning: Failed to enable realtime scheduling."
fg.start() # start flow graph
fg.wait() # wait for it to finish
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
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