gr_check_counting_s.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 #ifndef INCLUDED_GR_CHECK_COUNTING_S_H
00023 #define INCLUDED_GR_CHECK_COUNTING_S_H
00024 
00025 #include <gr_sync_block.h>
00026 
00027 class gr_check_counting_s;
00028 typedef boost::shared_ptr<gr_check_counting_s> gr_check_counting_s_sptr;
00029 
00030 gr_check_counting_s_sptr gr_make_check_counting_s ();
00031 
00038 class gr_check_counting_s : public gr_sync_block
00039 {
00040   friend gr_check_counting_s_sptr gr_make_check_counting_s ();
00041 
00042   enum state {
00043     SEARCHING,          // searching for synchronization
00044     LOCKED              // is locked
00045   };
00046 
00047   state                 d_state;
00048   unsigned int          d_history;              // bitmask of decisions
00049   unsigned short        d_current_count;
00050   
00051   long                  d_total_errors;
00052   long                  d_total_shorts;
00053 
00054   gr_check_counting_s ();
00055   
00056   void enter_SEARCHING ();
00057   void enter_LOCKED ();
00058 
00059   void right (){
00060     d_history = (d_history << 1) | 0x1;
00061   }
00062   
00063   void wrong (){
00064     d_history = (d_history << 1) | 0x0;
00065     d_total_errors++;
00066   }
00067 
00068   bool right_three_times () { return (d_history & 0x7) == 0x7; }
00069   bool wrong_three_times () { return (d_history & 0x7) == 0x0; }
00070 
00071   void log_error (unsigned short expected, unsigned short actual);
00072 
00073  public:
00074 
00075   int work (int noutput_items,
00076             gr_vector_const_void_star &input_items,
00077             gr_vector_void_star &output_items);
00078 };
00079 
00080 
00081 #endif /* INCLUDED_GR_CHECK_COUNTING_S_H */

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