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 */