root / gnuradio-core / src / lib / general / gr_simple_framer_sync.h @ 5d69a524
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| 1 | /* -*- c++ -*- */
|
|---|---|
| 2 | /*
|
| 3 | * Copyright 2004,2005 Free Software Foundation, Inc. |
| 4 | * |
| 5 | * This file is part of GNU Radio |
| 6 | * |
| 7 | * GNU Radio is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * GNU Radio is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with GNU Radio; see the file COPYING. If not, write to |
| 19 | * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | * Boston, MA 02111-1307, USA. |
| 21 | */ |
| 22 | |
| 23 | #ifndef INCLUDED_GR_SIMPLE_FRAMER_SYNC_H
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| 24 | #define INCLUDED_GR_SIMPLE_FRAMER_SYNC_H
|
| 25 | |
| 26 | /*
|
| 27 | * Here are a couple of maximum length sequences (m-sequences) that were generated by the |
| 28 | * the "mseq" matlab/octave code downloaded from: |
| 29 | * http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=990&objectType=file |
| 30 | * |
| 31 | * 31-bit m-sequence: |
| 32 | * 0110100100001010111011000111110 |
| 33 | * 0x690AEC76 (padded on right with a zero) |
| 34 | * |
| 35 | * 63-bit m-sequence: |
| 36 | * 101011001101110110100100111000101111001010001100001000001111110 |
| 37 | * 0xACDDA4E2F28C20FC (padded on right with a zero) |
| 38 | */ |
| 39 | |
| 40 | static const unsigned long long GRSF_SYNC = 0xacdda4e2f28c20fcULL; |
| 41 | |
| 42 | static const int GRSF_BITS_PER_BYTE = 8; |
| 43 | static const int GRSF_SYNC_OVERHEAD = sizeof(GRSF_SYNC); |
| 44 | static const int GRSF_PAYLOAD_OVERHEAD = 1; // 1 byte seqno |
| 45 | static const int GRSF_TAIL_PAD = 1; // one byte trailing padding |
| 46 | static const int GRSF_OVERHEAD = GRSF_SYNC_OVERHEAD + GRSF_PAYLOAD_OVERHEAD + GRSF_TAIL_PAD; |
| 47 | |
| 48 | |
| 49 | #endif /* INCLUDED_GR_SIMPLE_FRAMER_SYNC_H */ |