| 1 | # |
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| 2 | # Copyright 2005, 2006, 2007 Free Software Foundation, Inc. |
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| 3 | # |
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| 4 | # This file is part of GNU Radio |
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| 5 | # |
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| 6 | # GNU Radio is free software; you can redistribute it and/or modify |
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| 7 | # it under the terms of the GNU General Public License as published by |
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| 8 | # the Free Software Foundation; either version 3, or (at your option) |
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| 9 | # any later version. |
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| 10 | # |
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| 11 | # GNU Radio is distributed in the hope that it will be useful, |
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | # GNU General Public License for more details. |
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| 15 | # |
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| 16 | # You should have received a copy of the GNU General Public License |
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| 17 | # along with GNU Radio; see the file COPYING. If not, write to |
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| 18 | # the Free Software Foundation, Inc., 51 Franklin Street, |
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| 19 | # Boston, MA 02110-1301, USA. |
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| 20 | # |
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| 21 | |
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| 22 | from gnuradio import gr, gru, blks2 |
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| 23 | from gnuradio import eng_notation |
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| 24 | |
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| 25 | import copy |
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| 26 | import sys |
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| 27 | |
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| 28 | # ///////////////////////////////////////////////////////////////////////////// |
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| 29 | # transmit path |
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| 30 | # ///////////////////////////////////////////////////////////////////////////// |
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| 31 | |
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| 32 | class transmit_path(gr.hier_block2): |
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| 33 | def __init__(self, modulator_class, options): |
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| 34 | ''' |
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| 35 | See below for what options should hold |
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| 36 | ''' |
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| 37 | gr.hier_block2.__init__(self, "transmit_path", |
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| 38 | gr.io_signature(0, 0, 0), # Input signature |
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| 39 | gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature |
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| 40 | |
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| 41 | options = copy.copy(options) # make a copy so we can destructively modify |
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| 42 | |
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| 43 | self._verbose = options.verbose |
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| 44 | self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP |
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| 45 | self._bitrate = options.bitrate # desired bit rate |
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| 46 | self._samples_per_symbol = options.samples_per_symbol # desired samples/baud |
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| 47 | |
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| 48 | self._modulator_class = modulator_class # the modulator_class we are using |
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| 49 | |
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| 50 | # Get mod_kwargs |
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| 51 | mod_kwargs = self._modulator_class.extract_kwargs_from_options(options) |
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| 52 | |
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| 53 | # transmitter |
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| 54 | modulator = self._modulator_class(**mod_kwargs) |
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| 55 | self.packet_transmitter = \ |
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| 56 | blks2.mod_pkts(modulator, |
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| 57 | access_code=None, |
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| 58 | msgq_limit=4, |
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| 59 | pad_for_usrp=True) |
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| 60 | |
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| 61 | self.amp = gr.multiply_const_cc(1) |
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| 62 | self.set_tx_amplitude(self._tx_amplitude) |
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| 63 | |
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| 64 | # Display some information about the setup |
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| 65 | if self._verbose: |
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| 66 | self._print_verbage() |
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| 67 | |
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| 68 | # Connect components in the flowgraph |
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| 69 | self.connect(self.packet_transmitter, self.amp, self) |
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| 70 | |
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| 71 | def set_tx_amplitude(self, ampl): |
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| 72 | """ |
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| 73 | Sets the transmit amplitude sent to the USRP in volts |
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| 74 | @param: ampl 0 <= ampl < 1. |
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| 75 | """ |
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| 76 | self._tx_amplitude = max(0.0, min(ampl, 1)) |
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| 77 | self.amp.set_k(self._tx_amplitude) |
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| 78 | |
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| 79 | def send_pkt(self, payload='', eof=False): |
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| 80 | """ |
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| 81 | Calls the transmitter method to send a packet |
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| 82 | """ |
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| 83 | return self.packet_transmitter.send_pkt(payload, eof) |
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| 84 | |
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| 85 | def bitrate(self): |
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| 86 | return self._bitrate |
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| 87 | |
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| 88 | def samples_per_symbol(self): |
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| 89 | return self._samples_per_symbol |
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| 90 | |
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| 91 | def add_options(normal, expert): |
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| 92 | """ |
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| 93 | Adds transmitter-specific options to the Options Parser |
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| 94 | """ |
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| 95 | if not normal.has_option('--bitrate'): |
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| 96 | normal.add_option("-r", "--bitrate", type="eng_float", default=100e3, |
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| 97 | help="specify bitrate [default=%default].") |
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| 98 | normal.add_option("", "--tx-amplitude", type="eng_float", default=0.250, metavar="AMPL", |
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| 99 | help="set transmitter digital amplitude: 0 <= AMPL < 1 [default=%default]") |
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| 100 | normal.add_option("-v", "--verbose", action="store_true", default=False) |
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| 101 | |
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| 102 | expert.add_option("-S", "--samples-per-symbol", type="int", default=2, |
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| 103 | help="set samples/symbol [default=%default]") |
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| 104 | expert.add_option("", "--log", action="store_true", default=False, |
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| 105 | help="Log all parts of flow graph to file (CAUTION: lots of data)") |
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| 106 | |
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| 107 | # Make a static method to call before instantiation |
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| 108 | add_options = staticmethod(add_options) |
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| 109 | |
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| 110 | def _print_verbage(self): |
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| 111 | """ |
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| 112 | Prints information about the transmit path |
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| 113 | """ |
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| 114 | print "Tx amplitude %s" % (self._tx_amplitude) |
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| 115 | print "modulation: %s" % (self._modulator_class.__name__) |
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| 116 | print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate)) |
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| 117 | print "samples/symbol: %3d" % (self._samples_per_symbol) |
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| 118 | |
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