GNU Radio 2.x: gr_simple_framer

00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004,2005 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 2, 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., 59 Temple Place - Suite 330,
00020  * Boston, MA 02111-1307, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_SIMPLE_FRAMER_SYNC_H
00024 #define INCLUDED_GR_SIMPLE_FRAMER_SYNC_H
00025 
00026 /*
00027  * Here are a couple of maximum length sequences (m-sequences) that were generated by the
00028  * the "mseq" matlab/octave code downloaded from:
00029  * http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=990&objectType=file
00030  *
00031  * 31-bit m-sequence:
00032  *      0110100100001010111011000111110
00033  *      0x690AEC76 (padded on right with a zero)
00034  *
00035  * 63-bit m-sequence:
00036  *      101011001101110110100100111000101111001010001100001000001111110
00037  *      0xACDDA4E2F28C20FC (padded on right with a zero)
00038  */
00039 
00040 static const unsigned long long GRSF_SYNC = 0xacdda4e2f28c20fcULL;
00041 
00042 static const int GRSF_BITS_PER_BYTE = 8;
00043 static const int GRSF_SYNC_OVERHEAD = sizeof(GRSF_SYNC);
00044 static const int GRSF_PAYLOAD_OVERHEAD = 1;                     // 1 byte seqno
00045 static const int GRSF_TAIL_PAD = 1;                             // one byte trailing padding
00046 static const int GRSF_OVERHEAD = GRSF_SYNC_OVERHEAD + GRSF_PAYLOAD_OVERHEAD + GRSF_TAIL_PAD; 
00047 
00048 
00049 #endif /* INCLUDED_GR_SIMPLE_FRAMER_SYNC_H */
gr_simple_framer_sync.h
