#!/usr/bin/env python # # Copyright 2005,2006,2007,2009 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, gru, modulation_utils from gnuradio import usrp from gnuradio import eng_notation from gnuradio.eng_option import eng_option from optparse import OptionParser import random import struct import sys # from current dir from receive_path import receive_path from pick_bitrate import pick_rx_bitrate import usrp_options #import os #print os.getpid() #raw_input('Attach and press enter: ') class my_top_block(gr.top_block): def __init__(self, demodulator, rx_callback, options): gr.top_block.__init__(self) 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) self._bitrate = options.bitrate self._samples_per_symbol = options.samples_per_symbol self._demod_class = demodulator 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_usrp_source(options) # copy the final answers back into options for use by demodulator options.samples_per_symbol = self._samples_per_symbol options.bitrate = self._bitrate options.decim = self._decim ok = self.set_freq(self._rx_freq) if not ok: print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(self._rx_freq)) raise ValueError, eng_notation.num_to_str(self._rx_freq) self.set_gain(options.rx_gain) self.set_auto_tr(True) # enable Auto Transmit/Receive switching # Set up receive path self.rxpath = receive_path(demodulator, rx_callback, options) self.connect(self.u, self.rxpath) def _setup_usrp_source(self, options): self.u = usrp_options.create_usrp_source(options) adc_rate = self.u.adc_rate() self.u.set_decim(self._decim) (self._bitrate, self._samples_per_symbol, self._decim) = \ pick_rx_bitrate(self._bitrate, self._demod_class.bits_per_symbol(), \ self._samples_per_symbol, self._decim, adc_rate, \ self.u.get_decim_rates()) self.u.set_decim(self._decim) def set_freq(self, target_freq): """ Set the center frequency we're interested in. @param target_freq: frequency in Hz @rypte: bool Tuning is a two step process. First we ask the front-end to tune as close to the desired frequency as it can. Then we use the result of that operation and our target_frequency to determine the value for the digital up converter. """ return self.u.set_center_freq(target_freq) def set_gain(self, gain): """ Sets the analog gain in the USRP """ if gain is None: r = self.u.gain_range() gain = (r[0] + r[1])/2 # set gain to midpoint self.gain = gain return self.u.set_gain(gain) def set_auto_tr(self, enable): return self.u.set_auto_tr(enable) 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("-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") # 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 # ///////////////////////////////////////////////////////////////////////////// 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 = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( ok, pktno, n_rcvd, n_right) demods = modulation_utils.type_1_demods() # Create Options Parser: parser = OptionParser (option_class=eng_option, conflict_handler="resolve") expert_grp = parser.add_option_group("Expert") parser.add_option("-m", "--modulation", type="choice", choices=demods.keys(), default='gmsk', help="Select modulation from: %s [default=%%default]" % (', '.join(demods.keys()),)) my_top_block.add_options(parser, expert_grp) receive_path.add_options(parser, expert_grp) usrp_options.add_rx_options(parser) for mod in demods.values(): mod.add_options(expert_grp) (options, args) = parser.parse_args () if len(args) != 0: parser.print_help(sys.stderr) sys.exit(1) if options.rx_freq is None: sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") parser.print_help(sys.stderr) sys.exit(1) # build the graph tb = my_top_block(demods[options.modulation], 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