#!/usr/bin/env python # # Copyright 2006, 2007 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, blks2 from gnuradio import usrp from gnuradio import eng_notation from gnuradio.eng_option import eng_option from optparse import OptionParser import struct, sys # from current dir from receive_path import receive_path import fusb_options class my_top_block(gr.top_block): def __init__(self, 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._rx_subdev_spec = options.rx_subdev_spec # daughterboard to use self._decim = options.decim # Decimating rate for the USRP (prelim) self._fusb_block_size = options.fusb_block_size # usb info for USRP self._fusb_nblocks = options.fusb_nblocks # usb info for USRP 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() 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) g = self.subdev.gain_range() if options.show_rx_gain_range: print "Rx Gain Range: minimum = %g, maximum = %g, step size = %g" \ % (g[0], g[1], g[2]) self.set_gain(options.rx_gain) self.set_auto_tr(True) # enable Auto Transmit/Receive switching # Set up receive path self.rxpath = receive_path(callback, options) self.connect(self.u, self.rxpath) def _setup_usrp_source(self): self.u = usrp.source_c (fusb_block_size=self._fusb_block_size, fusb_nblocks=self._fusb_nblocks) adc_rate = self.u.adc_rate() self.u.set_decim_rate(self._decim) # determine the daughterboard subdevice we're using if self._rx_subdev_spec is None: self._rx_subdev_spec = usrp.pick_rx_subdevice(self.u) self.subdev = usrp.selected_subdev(self.u, self._rx_subdev_spec) self.u.set_mux(usrp.determine_rx_mux_value(self.u, self._rx_subdev_spec)) 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. """ r = self.u.tune(0, self.subdev, target_freq) if r: return True return False def set_gain(self, gain): """ Sets the analog gain in the USRP """ if gain is None: r = self.subdev.gain_range() gain = (r[0] + r[1])/2 # set gain to midpoint self.gain = gain return self.subdev.set_gain(gain) def set_auto_tr(self, enable): return self.subdev.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("-R", "--rx-subdev-spec", type="subdev", default=None, help="select USRP Rx side A or B") normal.add_option("", "--rx-gain", type="eng_float", default=None, metavar="GAIN", help="set receiver gain in dB [default=midpoint]. See also --show-rx-gain-range") normal.add_option("", "--show-rx-gain-range", action="store_true", default=False, help="print min and max Rx gain available on selected daughterboard") 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") expert.add_option("-d", "--decim", type="intx", default=128, help="set fpga decimation rate to DECIM [default=%default]") expert.add_option("", "--snr", type="eng_float", default=30, help="set the SNR of the channel in dB [default=%default]") # 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 # ///////////////////////////////////////////////////////////////////////////// def main(): global n_rcvd, n_right n_rcvd = 0 n_right = 0 def rx_callback(ok, payload): global n_rcvd, n_right n_rcvd += 1 (pktno,) = struct.unpack('!H', payload[0:2]) if ok: n_right += 1 print "ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d" % (ok, pktno, n_rcvd, n_right) if 0: printlst = list() for x in payload[2:]: t = hex(ord(x)).replace('0x', '') if(len(t) == 1): t = '0' + t printlst.append(t) printable = ''.join(printlst) print printable print "\n" parser = OptionParser(option_class=eng_option, conflict_handler="resolve") expert_grp = parser.add_option_group("Expert") parser.add_option("","--discontinuous", action="store_true", default=False, help="enable discontinuous") my_top_block.add_options(parser, expert_grp) receive_path.add_options(parser, expert_grp) blks2.ofdm_mod.add_options(parser, expert_grp) blks2.ofdm_demod.add_options(parser, expert_grp) fusb_options.add_options(expert_grp) (options, args) = parser.parse_args () # build the graph tb = my_top_block(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