#!/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
#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._tx_subdev_spec = options.tx_subdev_spec # daughterboard to use
self._interp = options.interp # interpolating rate for the USRP (prelim)
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()
# copy the final answers back into options for use by modulator
#options.bitrate = self._bitrate
self.txpath = transmit_path(modulator, options)
self.connect(self.txpath, self.u)
def _setup_usrp_sink(self):
"""
Creates a USRP sink, determines the settings for best bitrate,
and attaches to the transmitter's subdevice.
"""
self.u = usrp.sink_c()
self.u.set_interp_rate(self._interp)
# determine the daughterboard subdevice we're using
if self._tx_subdev_spec is None:
self._tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
self.u.set_mux(usrp.determine_tx_mux_value(self.u, self._tx_subdev_spec))
self.subdev = usrp.selected_subdev(self.u, self._tx_subdev_spec)
# 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.subdev.gain_range()[1])
# enable Auto Transmit/Receive switching
self.set_auto_tr(True)
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(self.subdev.which(), self.subdev, target_freq)
if r:
return True
return False
def set_gain(self, gain):
"""
Sets the analog gain in the USRP
"""
self.gain = gain
self.subdev.set_gain(gain)
def set_auto_tr(self, enable):
"""
Turns on auto transmit/receive of USRP daughterboard (if exits; else ignored)
"""
return self.subdev.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)
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