#!/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, time, struct, sys # from current dir from transmit_path import transmit_path from pick_bitrate import pick_tx_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, modulator, options): gr.top_block.__init__(self) self._tx_freq = options.tx_freq # tranmitter's center frequency self._interp = options.interp # interpolating rate for the USRP (prelim) self._bitrate = options.bitrate self._samples_per_symbol = options.samples_per_symbol self._modulator_class = modulator if self._tx_freq is None: sys.stderr.write("-f FREQ or --freq FREQ or --tx-freq FREQ must be specified\n") raise SystemExit # Set up USRP sink; also adjusts interp, and bitrate self._setup_usrp_sink(options) # copy the final answers back into options for use by modulator options.samples_per_symbol = self._samples_per_symbol options.bitrate = self._bitrate options.interp = self._interp # Set center frequency of USRP ok = self.set_freq(self._tx_freq) if not ok: print "Failed to set Tx frequency to %s" % (eng_notation.num_to_str(self._tx_freq),) raise ValueError # Set the USRP for maximum transmit gain # (Note that on the RFX cards this is a nop.) self.set_gain(self.u.gain_range()[1]) self.txpath = transmit_path(modulator, options) self.connect(self.txpath, self.u) def _setup_usrp_sink(self, options): """ Creates a USRP sink, determines the settings for best bitrate, and attaches to the transmitter's subdevice. """ self.u = usrp_options.create_usrp_sink(options) dac_rate = self.u.dac_rate() (self._bitrate, self._samples_per_symbol, self._interp) = \ pick_tx_bitrate(self._bitrate, self._modulator_class.bits_per_symbol(), \ self._samples_per_symbol, self._interp, dac_rate, \ self.u.get_interp_rates()) self.u.set_interp(self._interp) self.set_auto_tr(True) # enable Auto Transmit/Receive switching 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 """ self.gain = gain self.u.set_gain(gain) def set_auto_tr(self, enable): """ Turns on auto transmit/receive of USRP daughterboard (if exits; else ignored) """ return self.u.set_auto_tr(enable) def interp(self): return self._interp def add_options(normal, expert): """ Adds usrp-specific options to the Options Parser """ add_freq_option(normal) normal.add_option("-T", "--tx-subdev-spec", type="subdev", default=None, help="select USRP Tx side A or B") normal.add_option("-v", "--verbose", action="store_true", default=False) expert.add_option("", "--tx-freq", type="eng_float", default=None, help="set transmit frequency to FREQ [default=%default]", metavar="FREQ") expert.add_option("-i", "--interp", type="intx", default=256, help="set fpga interpolation rate to INTERP [default=%default]") # Make a static method to call before instantiation add_options = staticmethod(add_options) def _print_verbage(self): """ Prints information about the transmit path """ print "Using TX d'board %s" % (self.subdev.side_and_name(),) print "modulation: %s" % (self._modulator_class.__name__) print "interp: %3d" % (self._interp) print "Tx Frequency: %s" % (eng_notation.num_to_str(self._tx_freq)) 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(): def send_pkt(payload='', eof=False): return tb.txpath.send_pkt(payload, eof) def rx_callback(ok, payload): print "ok = %r, payload = '%s'" % (ok, payload) mods = modulation_utils.type_1_mods() parser = OptionParser(option_class=eng_option, conflict_handler="resolve") expert_grp = parser.add_option_group("Expert") parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(), default='gmsk', help="Select modulation from: %s [default=%%default]" % (', '.join(mods.keys()),)) parser.add_option("-s", "--size", type="eng_float", default=1500, help="set packet size [default=%default]") parser.add_option("-M", "--megabytes", type="eng_float", default=1.0, help="set megabytes to transmit [default=%default]") parser.add_option("","--discontinuous", action="store_true", default=False, help="enable discontinous transmission (bursts of 5 packets)") parser.add_option("","--from-file", default=None, help="use file for packet contents") my_top_block.add_options(parser, expert_grp) transmit_path.add_options(parser, expert_grp) usrp_options.add_tx_options(parser) for mod in mods.values(): mod.add_options(expert_grp) (options, args) = parser.parse_args () if len(args) != 0: parser.print_help() sys.exit(1) if options.tx_freq is None: sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") parser.print_help(sys.stderr) sys.exit(1) if options.from_file is not None: source_file = open(options.from_file, 'r') # build the graph tb = my_top_block(mods[options.modulation], options) r = gr.enable_realtime_scheduling() if r != gr.RT_OK: print "Warning: failed to enable realtime scheduling" tb.start() # start flow graph # generate and send packets nbytes = int(1e6 * options.megabytes) n = 0 pktno = 0 pkt_size = int(options.size) while n < nbytes: if options.from_file is None: data = (pkt_size - 2) * chr(pktno & 0xff) else: data = source_file.read(pkt_size - 2) if data == '': break; payload = struct.pack('!H', pktno & 0xffff) + data send_pkt(payload) n += len(payload) sys.stderr.write('.') if options.discontinuous and pktno % 5 == 4: time.sleep(1) pktno += 1 send_pkt(eof=True) tb.wait() # wait for it to finish if __name__ == '__main__': try: main() except KeyboardInterrupt: pass