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#
# Copyright 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
from gnuradio import usrp_options
import transmit_path
from pick_bitrate import pick_tx_bitrate
from gnuradio import eng_notation
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")
def add_options(parser, expert):
add_freq_option(parser)
usrp_options.add_tx_options(parser)
transmit_path.transmit_path.add_options(parser, expert)
expert.add_option("", "--tx-freq", type="eng_float", default=None,
help="set transmit frequency to FREQ [default=%default]", metavar="FREQ")
parser.add_option("-v", "--verbose", action="store_true", default=False)
class usrp_transmit_path(gr.hier_block2):
def __init__(self, modulator_class, options):
'''
See below for what options should hold
'''
gr.hier_block2.__init__(self, "usrp_transmit_path",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
if options.tx_freq is None:
sys.stderr.write("-f FREQ or --freq FREQ or --tx-freq FREQ must be specified\n")
raise SystemExit
tx_path = transmit_path.transmit_path(modulator_class, options)
for attr in dir(tx_path): #forward the methods
if not attr.startswith('_') and not hasattr(self, attr):
setattr(self, attr, getattr(tx_path, attr))
#setup usrp
self._modulator_class = modulator_class
self._setup_usrp_sink(options)
# Set up resampler based on rate determined by _setup_usrp_sink
rs_taps = gr.firdes.low_pass_2(32, 32, 0.45, 0.1, 60)
self.resampler = gr.pfb_arb_resampler_ccf(self.rs_rate, rs_taps)
#connect
self.connect(tx_path, self.resampler, 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.rs_rate = options.bitrate # Store requested bit rate
if options.verbose:
print 'USRP Sink:', self.u
(self._bitrate, self._samples_per_symbol, self._interp) = \
pick_tx_bitrate(options.bitrate, self._modulator_class.bits_per_symbol(), \
options.samples_per_symbol, options.interp, dac_rate, \
self.u.get_interp_rates())
# Calculate resampler rate based on requested and actual rates
self.rs_rate = self._bitrate / self.rs_rate
print "Resampling by %f to get bitrate of %ssps" % (self.rs_rate, eng_notation.num_to_str(self._bitrate/self.rs_rate))
self.u.set_interp(self._interp)
self.u.set_auto_tr(True)
if not self.u.set_center_freq(options.tx_freq):
print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(options.tx_freq))
raise ValueError, eng_notation.num_to_str(options.tx_freq)
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