2 # Copyright 2005,2006 Free Software Foundation, Inc.
4 # This file is part of GNU Radio
6 # GNU Radio is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 3, or (at your option)
11 # GNU Radio is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with GNU Radio; see the file COPYING. If not, write to
18 # the Free Software Foundation, Inc., 51 Franklin Street,
19 # Boston, MA 02110-1301, USA.
22 from gnuradio import gr, gru, blks
23 from gnuradio import usrp
24 from gnuradio import eng_notation
29 # /////////////////////////////////////////////////////////////////////////////
31 # /////////////////////////////////////////////////////////////////////////////
33 class transmit_path(gr.hier_block):
34 def __init__(self, fg, options):
36 See below for what options should hold
39 options = copy.copy(options) # make a copy so we can destructively modify
41 self._verbose = options.verbose
42 self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP
45 blks.ofdm_mod(fg, options, msgq_limit=4, pad_for_usrp=False)
47 self.amp = gr.multiply_const_cc(1)
48 self.set_tx_amplitude(self._tx_amplitude)
50 # Display some information about the setup
54 # Create and setup transmit path flow graph
55 fg.connect(self.ofdm_tx, self.amp)
56 gr.hier_block.__init__(self, fg, None, self.amp)
58 def set_tx_amplitude(self, ampl):
60 Sets the transmit amplitude sent to the USRP
61 @param: ampl 0 <= ampl < 32768. Try 8000
63 self._tx_amplitude = max(0.0, min(ampl, 32767.0))
64 self.amp.set_k(self._tx_amplitude)
66 def send_pkt(self, payload='', eof=False):
68 Calls the transmitter method to send a packet
70 return self.ofdm_tx.send_pkt(payload, eof)
72 def add_options(normal, expert):
74 Adds transmitter-specific options to the Options Parser
76 normal.add_option("", "--tx-amplitude", type="eng_float", default=200, metavar="AMPL",
77 help="set transmitter digital amplitude: 0 <= AMPL < 32768 [default=%default]")
78 normal.add_option("-v", "--verbose", action="store_true", default=False)
79 expert.add_option("", "--log", action="store_true", default=False,
80 help="Log all parts of flow graph to file (CAUTION: lots of data)")
82 # Make a static method to call before instantiation
83 add_options = staticmethod(add_options)
85 def _print_verbage(self):
87 Prints information about the transmit path
89 print "Tx amplitude %s" % (self._tx_amplitude)