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<h1>gri_lfsr_15_1_0.h</h1> </div>
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<a href="gri__lfsr__15__1__0_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c++ -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/*</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright 2004 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment"> * </span>
<a name="l00005"></a>00005 <span class="comment"> * This file is part of GNU Radio</span>
<a name="l00006"></a>00006 <span class="comment"> * </span>
<a name="l00007"></a>00007 <span class="comment"> * GNU Radio is free software; you can redistribute it and/or modify</span>
<a name="l00008"></a>00008 <span class="comment"> * it under the terms of the GNU General Public License as published by</span>
<a name="l00009"></a>00009 <span class="comment"> * the Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00010"></a>00010 <span class="comment"> * any later version.</span>
<a name="l00011"></a>00011 <span class="comment"> * </span>
<a name="l00012"></a>00012 <span class="comment"> * GNU Radio is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00015"></a>00015 <span class="comment"> * GNU General Public License for more details.</span>
<a name="l00016"></a>00016 <span class="comment"> * </span>
<a name="l00017"></a>00017 <span class="comment"> * You should have received a copy of the GNU General Public License</span>
<a name="l00018"></a>00018 <span class="comment"> * along with GNU Radio; see the file COPYING. If not, write to</span>
<a name="l00019"></a>00019 <span class="comment"> * the Free Software Foundation, Inc., 51 Franklin Street,</span>
<a name="l00020"></a>00020 <span class="comment"> * Boston, MA 02110-1301, USA.</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#ifndef INCLUDED_GRI_LFSR_15_1_0_H</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#define INCLUDED_GRI_LFSR_15_1_0_H</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment">/*!</span>
<a name="l00027"></a>00027 <span class="comment"> * \brief Linear Feedback Shift Register using primitive polynomial x^15 + x + 1</span>
<a name="l00028"></a>00028 <span class="comment"> * \ingroup misc</span>
<a name="l00029"></a>00029 <span class="comment"> *</span>
<a name="l00030"></a>00030 <span class="comment"> * Generates a maximal length pseudo-random sequence of length 2^15 - 1 bits.</span>
<a name="l00031"></a>00031 <span class="comment"> */</span>
<a name="l00032"></a>00032
<a name="l00033"></a><a class="code" href="classgri__lfsr__15__1__0.html">00033</a> <span class="keyword">class </span><a class="code" href="classgri__lfsr__15__1__0.html" title="Linear Feedback Shift Register using primitive polynomial x^15 + x + 1Generates a maximal length pseu...">gri_lfsr_15_1_0</a> {
<a name="l00034"></a>00034 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> d_sr; <span class="comment">// shift register</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="keyword">public</span>:
<a name="l00037"></a>00037
<a name="l00038"></a><a class="code" href="classgri__lfsr__15__1__0.html#a038cc894f6b9d36529b4cdd3ac0d60b3">00038</a> <a class="code" href="classgri__lfsr__15__1__0.html#a038cc894f6b9d36529b4cdd3ac0d60b3">gri_lfsr_15_1_0</a> () { <a class="code" href="classgri__lfsr__15__1__0.html#a41831a70ef71382033b1e26e56ea8750">reset</a> (); }
<a name="l00039"></a>00039
<a name="l00040"></a><a class="code" href="classgri__lfsr__15__1__0.html#a41831a70ef71382033b1e26e56ea8750">00040</a> <span class="keywordtype">void</span> <a class="code" href="classgri__lfsr__15__1__0.html#a41831a70ef71382033b1e26e56ea8750">reset</a> () { d_sr = 0x7fff; }
<a name="l00041"></a>00041
<a name="l00042"></a><a class="code" href="classgri__lfsr__15__1__0.html#abf2553724260df2e5f7e17eb68b27a07">00042</a> <span class="keywordtype">int</span> <a class="code" href="classgri__lfsr__15__1__0.html#abf2553724260df2e5f7e17eb68b27a07">next_bit</a> (){
<a name="l00043"></a>00043 d_sr = ((((d_sr >> 1) ^ d_sr) & 0x1) << 14) | (d_sr >> 1);
<a name="l00044"></a>00044 <span class="keywordflow">return</span> d_sr & 0x1;
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046
<a name="l00047"></a><a class="code" href="classgri__lfsr__15__1__0.html#abfef7e93b4c936da51d555300793d2a0">00047</a> <span class="keywordtype">int</span> <a class="code" href="classgri__lfsr__15__1__0.html#abfef7e93b4c936da51d555300793d2a0">next_byte</a> (){
<a name="l00048"></a>00048 <span class="keywordtype">int</span> v = 0;
<a name="l00049"></a>00049 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < 8; i++){
<a name="l00050"></a>00050 v >>= 1;
<a name="l00051"></a>00051 <span class="keywordflow">if</span> (<a class="code" href="classgri__lfsr__15__1__0.html#abf2553724260df2e5f7e17eb68b27a07">next_bit</a> ())
<a name="l00052"></a>00052 v |= 0x80;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054 <span class="keywordflow">return</span> v;
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 };
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="preprocessor">#endif </span><span class="comment">/* INCLUDED_GRI_LFSR_15_1_0_H */</span>
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