GNU Radio 2.x: gr_check_counting_s.h Source File

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# 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 */