doc/doxygen-3.7.1/simple__framer__sync_8h_source.html

00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004,2005,2012 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022
00023 #ifndef INCLUDED_GR_SIMPLE_FRAMER_SYNC_H
00024 #define INCLUDED_GR_SIMPLE_FRAMER_SYNC_H
00025
00026 namespace gr {
00027   namespace digital {
00028
00029     /*!
00030      * Here are a couple of maximum length sequences (m-sequences)
00031      * that were generated by the the "mseq" matlab/octave code
00032      * downloaded from: <a
00033      * href="http://www.mathworks.com/matlabcentral/fileexchange/990">http://www.mathworks.com/matlabcentral/fileexchange/990</a>
00034      *
00035      * <pre>
00036      * 31-bit m-sequence:
00037      *  0110100100001010111011000111110
00038      *  0x690AEC76 (padded on right with a zero)
00039      *
00040      * 63-bit m-sequence:
00041      *  101011001101110110100100111000101111001010001100001000001111110
00042      *      0xACDDA4E2F28C20FC (padded on right with a zero)
00043      * </pre>
00044      */
00045     static const unsigned long long GRSF_SYNC = 0xacdda4e2f28c20fcULL;
00046
00047     static const int GRSF_BITS_PER_BYTE = 8;
00048     static const int GRSF_SYNC_OVERHEAD = sizeof(GRSF_SYNC);
00049     static const int GRSF_PAYLOAD_OVERHEAD = 1;                 // 1 byte seqno
00050     static const int GRSF_TAIL_PAD = 1;                         // one byte trailing padding
00051     static const int GRSF_OVERHEAD = GRSF_SYNC_OVERHEAD + GRSF_PAYLOAD_OVERHEAD + GRSF_TAIL_PAD;
00052
00053   } /* namespace digital */
00054 } /* namespace gr */
00055
00056 #endif /* INCLUDED_GR_SIMPLE_FRAMER_SYNC_H */