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#
# Copyright 2005,2006 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, blks
from gnuradio import usrp
from gnuradio import eng_notation
import copy
import sys
# /////////////////////////////////////////////////////////////////////////////
# transmit path
# /////////////////////////////////////////////////////////////////////////////
class transmit_path(gr.hier_block):
def __init__(self, fg, options):
'''
See below for what options should hold
'''
options = copy.copy(options) # make a copy so we can destructively modify
self._verbose = options.verbose
self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP
self.ofdm_tx = \
blks.ofdm_mod(fg, options, msgq_limit=4, pad_for_usrp=False)
self.amp = gr.multiply_const_cc(1)
self.set_tx_amplitude(self._tx_amplitude)
# Display some information about the setup
if self._verbose:
self._print_verbage()
# Create and setup transmit path flow graph
fg.connect(self.ofdm_tx, self.amp)
gr.hier_block.__init__(self, fg, None, self.amp)
def set_tx_amplitude(self, ampl):
"""
Sets the transmit amplitude sent to the USRP
@param: ampl 0 <= ampl < 32768. Try 8000
"""
self._tx_amplitude = max(0.0, min(ampl, 32767.0))
self.amp.set_k(self._tx_amplitude)
def send_pkt(self, payload='', eof=False):
"""
Calls the transmitter method to send a packet
"""
return self.ofdm_tx.send_pkt(payload, eof)
def add_options(normal, expert):
"""
Adds transmitter-specific options to the Options Parser
"""
normal.add_option("", "--tx-amplitude", type="eng_float", default=200, metavar="AMPL",
help="set transmitter digital amplitude: 0 <= AMPL < 32768 [default=%default]")
normal.add_option("-v", "--verbose", action="store_true", default=False)
expert.add_option("", "--log", action="store_true", default=False,
help="Log all parts of flow graph to file (CAUTION: lots of data)")
# Make a static method to call before instantiation
add_options = staticmethod(add_options)
def _print_verbage(self):
"""
Prints information about the transmit path
"""
print "Tx amplitude %s" % (self._tx_amplitude)
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