GNU Radio 3.5.3.2 C++ API
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 3, 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., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 #ifndef INCLUDED_GR_CHECK_COUNTING_S_H
00023 #define INCLUDED_GR_CHECK_COUNTING_S_H
00024 
00025 #include <gr_core_api.h>
00026 #include <gr_sync_block.h>
00027 
00028 class gr_check_counting_s;
00029 typedef boost::shared_ptr<gr_check_counting_s> gr_check_counting_s_sptr;
00030 
00031 GR_CORE_API gr_check_counting_s_sptr gr_make_check_counting_s (bool do_32bit=false);
00032 
00033 /*!
00034  * \brief sink that checks if its input stream consists of a counting sequence.
00035  * \param do_32bit  expect an interleaved 32 bit counter in stead of 16 bit counter (default false)
00036  * \ingroup sink_blk
00037  *
00038  * This sink is typically used to test the USRP "Counting Mode" or "Counting mode 32 bit".
00039  */
00040 class GR_CORE_API gr_check_counting_s : public gr_sync_block
00041 {
00042   friend GR_CORE_API gr_check_counting_s_sptr gr_make_check_counting_s (bool do_32bit);
00043 
00044   enum state {
00045     SEARCHING,    // searching for synchronization
00046     LOCKED    // is locked
00047   };
00048 
00049   state      d_state;
00050   unsigned int    d_history;    // bitmask of decisions
00051   unsigned short  d_current_count;
00052   unsigned int    d_current_count_32bit;
00053   
00054   long      d_total_errors;
00055   long      d_total_shorts;
00056   bool      d_do_32bit;
00057 
00058   gr_check_counting_s (bool do_32bit);
00059   
00060   void enter_SEARCHING ();
00061   void enter_LOCKED ();
00062 
00063   void right (){
00064     d_history = (d_history << 1) | 0x1;
00065   }
00066   
00067   void wrong (){
00068     d_history = (d_history << 1) | 0x0;
00069     d_total_errors++;
00070   }
00071 
00072   bool right_three_times () { return (d_history & 0x7) == 0x7; }
00073   bool wrong_three_times () { return (d_history & 0x7) == 0x0; }
00074 
00075   void log_error (unsigned short expected, unsigned short actual);
00076   void log_error_32bit (unsigned int expected, unsigned int actual);
00077   
00078   int check_32bit (int noutput_items, unsigned short * in);
00079   int check_16bit (int noutput_items, unsigned short * in);
00080 
00081  public:
00082 
00083   int work (int noutput_items,
00084       gr_vector_const_void_star &input_items,
00085       gr_vector_void_star &output_items);
00086 };
00087 
00088 
00089 #endif /* INCLUDED_GR_CHECK_COUNTING_S_H */