[319] | 1 | # |
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| 2 | # Copyright 2005,2006,2007,2009 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 usrp |
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| 24 | from gnuradio import eng_notation |
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| 25 | |
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| 26 | import copy |
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| 27 | import sys |
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| 28 | |
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| 29 | # from current dir |
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| 30 | from pick_bitrate import pick_tx_bitrate |
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| 31 | import usrp_options |
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| 32 | |
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| 33 | # ///////////////////////////////////////////////////////////////////////////// |
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| 34 | # transmit path |
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| 35 | # ///////////////////////////////////////////////////////////////////////////// |
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| 36 | |
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| 37 | class transmit_path(gr.hier_block2): |
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| 38 | def __init__(self, modulator_class, options): |
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| 39 | ''' |
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| 40 | See below for what options should hold |
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| 41 | ''' |
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| 42 | gr.hier_block2.__init__(self, "transmit_path", |
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| 43 | gr.io_signature(0, 0, 0), # Input signature |
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| 44 | gr.io_signature(0, 0, 0)) # Output signature |
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| 45 | |
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| 46 | options = copy.copy(options) # make a copy so we can destructively modify |
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| 47 | |
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| 48 | self._verbose = options.verbose |
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| 49 | self._tx_freq = options.tx_freq # tranmitter's center frequency |
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| 50 | self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP |
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| 51 | self._bitrate = options.bitrate # desired bit rate |
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| 52 | self._interp = options.interp # interpolating rate for the USRP (prelim) |
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| 53 | self._samples_per_symbol = options.samples_per_symbol # desired samples/baud |
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| 54 | self._use_whitener_offset = options.use_whitener_offset # increment start of whitener XOR data |
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| 55 | |
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| 56 | self._modulator_class = modulator_class # the modulator_class we are using |
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| 57 | |
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| 58 | if self._tx_freq is None: |
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| 59 | sys.stderr.write("-f FREQ or --freq FREQ or --tx-freq FREQ must be specified\n") |
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| 60 | raise SystemExit |
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| 61 | |
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| 62 | # Set up USRP sink; also adjusts interp, samples_per_symbol, and bitrate |
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| 63 | self._setup_usrp_sink(options) |
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| 64 | |
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| 65 | if options.show_tx_ampl_range: |
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| 66 | print "Tx Amplitude Range: minimum = %g, maximum = %g"%tuple(self.u.ampl_range()) |
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| 67 | |
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| 68 | # copy the final answers back into options for use by modulator |
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| 69 | options.samples_per_symbol = self._samples_per_symbol |
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| 70 | options.bitrate = self._bitrate |
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| 71 | options.interp = self._interp |
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| 72 | |
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| 73 | # Get mod_kwargs |
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| 74 | mod_kwargs = self._modulator_class.extract_kwargs_from_options(options) |
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| 75 | |
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| 76 | # Set center frequency of USRP |
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| 77 | ok = self.set_freq(self._tx_freq) |
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| 78 | if not ok: |
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| 79 | print "Failed to set Tx frequency to %s" % (eng_notation.num_to_str(self._tx_freq),) |
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| 80 | raise ValueError |
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| 81 | |
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| 82 | # transmitter |
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| 83 | self.packet_transmitter = \ |
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| 84 | blks2.mod_pkts(self._modulator_class(**mod_kwargs), |
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| 85 | access_code=None, |
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| 86 | msgq_limit=4, |
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| 87 | pad_for_usrp=True, |
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| 88 | use_whitener_offset=options.use_whitener_offset) |
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| 89 | |
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| 90 | |
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| 91 | # Set the USRP for maximum transmit gain |
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| 92 | # (Note that on the RFX cards this is a nop.) |
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| 93 | self.set_gain(self.u.gain_range()[1]) |
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| 94 | |
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| 95 | self.amp = gr.multiply_const_cc(1) |
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| 96 | self.set_tx_amplitude(self._tx_amplitude) |
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| 97 | |
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| 98 | # Display some information about the setup |
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| 99 | if self._verbose: |
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| 100 | self._print_verbage() |
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| 101 | |
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| 102 | # Create and setup transmit path flow graph |
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| 103 | self.connect(self.packet_transmitter, self.amp, self.u) |
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| 104 | |
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| 105 | def _setup_usrp_sink(self, options): |
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| 106 | """ |
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| 107 | Creates a USRP sink, determines the settings for best bitrate, |
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| 108 | and attaches to the transmitter's subdevice. |
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| 109 | """ |
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| 110 | self.u = usrp_options.create_usrp_sink(options) |
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| 111 | dac_rate = self.u.dac_rate(); |
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| 112 | |
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| 113 | # derive values of bitrate, samples_per_symbol, and interp from desired info |
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| 114 | (self._bitrate, self._samples_per_symbol, self._interp) = \ |
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| 115 | pick_tx_bitrate(self._bitrate, self._modulator_class.bits_per_symbol(), |
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| 116 | self._samples_per_symbol, self._interp, dac_rate) |
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| 117 | |
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| 118 | self.u.set_interp(self._interp) |
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| 119 | print "printing interpolation ",self._interp,"\n" |
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| 120 | |
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| 121 | def set_freq(self, target_freq): |
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| 122 | """ |
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| 123 | Set the center frequency we're interested in. |
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| 124 | |
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| 125 | @param target_freq: frequency in Hz |
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| 126 | @rypte: bool |
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| 127 | |
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| 128 | Tuning is a two step process. First we ask the front-end to |
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| 129 | tune as close to the desired frequency as it can. Then we use |
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| 130 | the result of that operation and our target_frequency to |
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| 131 | determine the value for the digital up converter. |
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| 132 | """ |
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| 133 | return self.u.set_center_freq(target_freq) |
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| 134 | |
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| 135 | def set_gain(self, gain): |
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| 136 | """ |
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| 137 | Sets the analog gain in the USRP |
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| 138 | """ |
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| 139 | return self.u.set_gain(gain) |
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| 140 | |
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| 141 | def set_tx_amplitude(self, ampl): |
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| 142 | """ |
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| 143 | Sets the transmit amplitude sent to the USRP |
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| 144 | @param ampl the amplitude or None for automatic |
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| 145 | """ |
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| 146 | ampl_range = self.u.ampl_range() |
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| 147 | if ampl is None: ampl = (ampl_range[1] - ampl_range[0])*0.15 + ampl_range[0] |
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| 148 | self._tx_amplitude = max(ampl_range[0], min(ampl, ampl_range[1])) |
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| 149 | self.amp.set_k(self._tx_amplitude) |
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| 150 | |
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| 151 | def send_pkt(self, payload='', eof=False): |
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| 152 | """ |
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| 153 | Calls the transmitter method to send a packet |
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| 154 | """ |
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| 155 | return self.packet_transmitter.send_pkt(payload, eof) |
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| 156 | |
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| 157 | def bitrate(self): |
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| 158 | return self._bitrate |
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| 159 | |
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| 160 | def samples_per_symbol(self): |
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| 161 | return self._samples_per_symbol |
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| 162 | |
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| 163 | def interp(self): |
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| 164 | return self._interp |
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| 165 | |
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| 166 | def add_options(normal, expert): |
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| 167 | """ |
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| 168 | Adds transmitter-specific options to the Options Parser |
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| 169 | """ |
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| 170 | add_freq_option(normal) |
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| 171 | if not normal.has_option('--bitrate'): |
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| 172 | normal.add_option("-r", "--bitrate", type="eng_float", default=None, |
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| 173 | help="specify bitrate. samples-per-symbol and interp/decim will be derived.") |
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| 174 | usrp_options.add_tx_options(normal, expert) |
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| 175 | normal.add_option("--tx-amplitude", type="eng_float", default=None, metavar="AMPL", |
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| 176 | help="set transmitter digital amplitude [default=midpoint]. See also --show-tx-ampl-range") |
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| 177 | normal.add_option("--show-tx-ampl-range", action="store_true", default=False, |
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| 178 | help="print min and max Tx amplitude available") |
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| 179 | normal.add_option("-v", "--verbose", action="store_true", default=False) |
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| 180 | expert.add_option("-S", "--samples-per-symbol", type="int", default=None, |
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| 181 | help="set samples/symbol [default=%default]") |
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| 182 | expert.add_option("", "--tx-freq", type="eng_float", default=None, |
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| 183 | help="set transmit frequency to FREQ [default=%default]", metavar="FREQ") |
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| 184 | expert.add_option("", "--log", action="store_true", default=False, |
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| 185 | help="Log all parts of flow graph to file (CAUTION: lots of data)") |
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| 186 | expert.add_option("","--use-whitener-offset", action="store_true", default=False, |
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| 187 | help="make sequential packets use different whitening") |
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| 188 | |
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| 189 | # Make a static method to call before instantiation |
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| 190 | add_options = staticmethod(add_options) |
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| 191 | |
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| 192 | def _print_verbage(self): |
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| 193 | """ |
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| 194 | Prints information about the transmit path |
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| 195 | """ |
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| 196 | print "Using TX d'board %s" % (self.u,) |
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| 197 | print "Tx amplitude %s" % (self._tx_amplitude) |
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| 198 | print "modulation: %s" % (self._modulator_class.__name__) |
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| 199 | print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate)) |
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| 200 | print "samples/symbol: %3d" % (self._samples_per_symbol) |
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| 201 | print "interp: %3d" % (self._interp) |
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| 202 | print "Tx Frequency: %s" % (eng_notation.num_to_str(self._tx_freq)) |
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| 203 | |
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| 204 | |
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| 205 | def add_freq_option(parser): |
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| 206 | """ |
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| 207 | Hackery that has the -f / --freq option set both tx_freq and rx_freq |
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| 208 | """ |
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| 209 | def freq_callback(option, opt_str, value, parser): |
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| 210 | parser.values.rx_freq = value |
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| 211 | parser.values.tx_freq = value |
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| 212 | |
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| 213 | if not parser.has_option('--freq'): |
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| 214 | parser.add_option('-f', '--freq', type="eng_float", |
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| 215 | action="callback", callback=freq_callback, |
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| 216 | help="set Tx and/or Rx frequency to FREQ [default=%default]", |
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| 217 | metavar="FREQ") |
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