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gr_simple_correlator.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004 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_CORRELATOR_H
00024 #define INCLUDED_GR_SIMPLE_CORRELATOR_H
00025 
00026 #include <gr_block.h>
00027 
00028 class gr_simple_correlator;
00029 typedef boost::shared_ptr<gr_simple_correlator> gr_simple_correlator_sptr;
00030 
00031 gr_simple_correlator_sptr gr_make_simple_correlator (int payload_bytesize);
00032 
00039 class gr_simple_correlator : public gr_block
00040 {
00041   static const int OVERSAMPLE = 8;
00042   enum state_t { ST_LOOKING, ST_LOCKED };
00043   
00044   int            d_payload_bytesize;
00045   state_t        d_state;
00046   int            d_seqno;
00047   unsigned char *d_buf;
00048   int            d_bufsize;
00049   int            d_bi;                  // buffer index
00050   unsigned char *d_pktbuf;
00051   int            d_best_fit;            // [0,7]
00052   unsigned int   d_shift_reg[OVERSAMPLE];
00053 
00054   friend gr_simple_correlator_sptr gr_make_simple_correlator (int payload_bytesize);
00055   gr_simple_correlator (int payload_bytesize);
00056 
00057   void enter_locked ();
00058   void enter_looking ();
00059   
00060  public:
00061   ~gr_simple_correlator ();
00062 
00063   int general_work (int noutput_items,
00064                     gr_vector_int &ninput_items,
00065                     gr_vector_const_void_star &input_items,
00066                     gr_vector_void_star &output_items);
00067 };
00068 
00069 
00070 #endif /* INCLUDED_GR_SIMPLE_CORRELATOR_H */

Generated on Mon Oct 11 07:41:08 2004 for GNU Radio 2.x by doxygen 1.3.3