#!/usr/bin/env python # # Copyright 2008 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, eng_notation, uhd from gnuradio.eng_option import eng_option from optparse import OptionParser from transmit_path import transmit_path import sys _dac_rate = 128e6 n2s = eng_notation.num_to_str class tx_bpsk_block(gr.top_block): def __init__(self, options): gr.top_block.__init__(self, "tx_mpsk") self._transmitter = transmit_path(options.sps, options.excess_bw, options.amplitude) if_rate = options.rate*options.sps interp = int(_dac_rate/if_rate) print "Modulation:", n2s(options.rate), "bits/sec" print "TX IF rate:", n2s(if_rate), "samples/sec" print "USRP interpolation:", interp print "DAC amplitude:", options.amplitude self._setup_usrp(options.ip, interp, options.gain, options.tx_freq) self.connect(self._transmitter, self._usrp) def _setup_usrp(self,ip,interp, gain, tx_freq): self._usrp = uhd.usrp_sink(device_addr="", io_type=uhd.io_type.COMPLEX_FLOAT32, num_channels=1 ) #set Tx Gain self._usrp.set_gain(gain,0) print "Gain d'board:",(n2s(gain)),"dB" #Tune to center frequency tr = self._usrp.set_center_freq(options.tx_freq, 0) if not (tr): print "Failed to tune to Tx frequency to %s" % (n2s(options.tx_freq)) else: print "Actual center frequency",n2s(options.tx_freq) def get_options(): parser = OptionParser(option_class=eng_option) parser.add_option("--ip", "--device_addr",type="string",default="192.168.10.2", help="device address[default=%default]") parser.add_option("-g", "--gain", type="eng_float", default=None, help="set TX gain (default is midpoint)") parser.add_option("-f", "--tx-freq", type="eng_float", default=None, help="set Tx frequency to FREQ", metavar="FREQ") parser.add_option("-a", "--amplitude", type="eng_float", default=2000, help="set Tx amplitude (0-32767) (default=%default)") parser.add_option("-r", "--rate", type="eng_float", default=250e3, help="Select modulation symbol rate (default=%default)") parser.add_option("", "--sps", type="int", default=2, help="Select samples per symbol (default=%default)") parser.add_option("", "--excess-bw", type="eng_float", default=0.35, help="Select RRC excess bandwidth (default=%default)") (options, args) = parser.parse_args() if len(args) != 0: parser.print_help() sys.exit(1) if options.tx_freq == None: print "Must supply frequency as -f or --freq" sys.exit(1) return (options, args) if __name__ == "__main__": (options, args) = get_options() tb = tx_bpsk_block(options) try: tb.run() except KeyboardInterrupt: pass