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, blks2
23 from gnuradio import usrp
24 from gnuradio import eng_notation
29 # /////////////////////////////////////////////////////////////////////////////
31 # /////////////////////////////////////////////////////////////////////////////
33 class transmit_path(gr.hier_block2):
34 def __init__(self, options):
36 See below for what options should hold
39 gr.hier_block2.__init__(self, "transmit_path",
40 gr.io_signature(0, 0, 0), # Input signature
41 gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
43 options = copy.copy(options) # make a copy so we can destructively modify
45 self._verbose = options.verbose # turn verbose mode on/off
46 self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP
49 blks2.ofdm_mod(options, msgq_limit=4, pad_for_usrp=False)
51 self.amp = gr.multiply_const_cc(1)
52 self.set_tx_amplitude(self._tx_amplitude)
54 # Display some information about the setup
58 # Create and setup transmit path flow graph
59 self.connect(self.ofdm_tx, self.amp, self)
61 def set_tx_amplitude(self, ampl):
63 Sets the transmit amplitude sent to the USRP
64 @param: ampl 0 <= ampl < 32768. Try 8000
66 self._tx_amplitude = max(0.0, min(ampl, 32767.0))
67 self.amp.set_k(self._tx_amplitude)
69 def send_pkt(self, payload='', eof=False):
71 Calls the transmitter method to send a packet
73 return self.ofdm_tx.send_pkt(payload, eof)
75 def add_options(normal, expert):
77 Adds transmitter-specific options to the Options Parser
79 normal.add_option("", "--tx-amplitude", type="eng_float", default=200, metavar="AMPL",
80 help="set transmitter digital amplitude: 0 <= AMPL < 32768 [default=%default]")
81 normal.add_option("-v", "--verbose", action="store_true", default=False)
82 expert.add_option("", "--log", action="store_true", default=False,
83 help="Log all parts of flow graph to file (CAUTION: lots of data)")
85 # Make a static method to call before instantiation
86 add_options = staticmethod(add_options)
88 def _print_verbage(self):
90 Prints information about the transmit path
92 print "Tx amplitude %s" % (self._tx_amplitude)