GNU Radio 2.x: gri_lfsr_32k.h Source File

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# gri_lfsr_32k.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_GRI_LFSR_32k_H
    00024 #define INCLUDED_GRI_LFSR_32k_H
    00025
    00026 #include <gri_lfsr_15_1_0.h>
    00027
    00035 class gri_lfsr_32k {
    00036   gri_lfsr_15_1_0       d_lfsr;
    00037   unsigned int          d_count;
    00038
    00039  public:
    00040   gri_lfsr_32k () { reset (); }
    00041
    00042   void reset (){
    00043     d_lfsr.reset ();
    00044     d_count = 0;
    00045   }
    00046
    00047   int next_bit (){
    00048     if (d_count == 32767){
    00049       d_count = 0;
    00050       return 0;
    00051     }
    00052     d_count++;
    00053     return d_lfsr.next_bit ();
    00054   }
    00055
    00056   int next_byte (){
    00057     int v = 0;
    00058     for (int i = 0; i < 8; i++){
    00059       v >>= 1;
    00060       if (next_bit ())
    00061         v |= 0x80;
    00062     }
    00063     return v;
    00064   }
    00065
    00066   int next_short (){
    00067     int v = 0;
    00068     for (int i = 0; i < 16; i++){
    00069       v >>= 1;
    00070       if (next_bit ())
    00071         v |= 0x8000;
    00072     }
    00073     return v;
    00074   }
    00075
    00076 };
    00077
    00078 #endif /* INCLUDED_GRI_LFSR_32k_H */