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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon AVRlib: fixedpt.h Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.2 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div><h1>fixedpt.h</h1><a href="fixedpt_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file fixedpt.h \brief Fixed-point math function library. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'fixedpt.h'</span>00005 <span class="comment">// Title : Fixed-point math function library</span>00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2003</span>00007 <span class="comment">// Created : 2003.01.26</span>00008 <span class="comment">// Revised : 2003.02.04</span>00009 <span class="comment">// Version : 0.1</span>00010 <span class="comment">// Target MCU : Atmel AVR Series</span>00011 <span class="comment">// Editor Tabs : 4</span>00012 <span class="comment">//</span>00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>00016 <span class="comment">//</span><span class="comment"></span>00017 <span class="comment">/// \ingroup general</span>00018 <span class="comment">/// \defgroup fixedpt Fixed-Point Math Function Library (fixedpt.c)</span>00019 <span class="comment">/// \code #include "fixedpt.h" \endcode</span>00020 <span class="comment">/// \par Overview</span>00021 <span class="comment">/// This library provides basic fixed-point math operations implemented in</span>00022 <span class="comment">/// C. Fixed-point math is a system by which integer variables can</span>00023 <span class="comment">/// represent fractional values with a fixed precision "behind" the decimal</span>00024 <span class="comment">/// point (like a fixed number of decimal places). Fixed-point math is</span>00025 <span class="comment">/// typically 10x faster to execute than floating-point math, and should</span>00026 <span class="comment">/// be used when a limited amount of fractional precision is sufficient</span>00027 <span class="comment">/// (such as 4ths, or 10ths, or 128ths, etc).</span>00028 <span class="comment">///</span>00029 <span class="comment">/// \note This library is really meant more as a demonstration of fixed-pt</span>00030 <span class="comment">/// math. For best code-efficiency and speed, you are enouraged to take</span>00031 <span class="comment">/// the code you see in these functions and copy it into your own code.</span>00032 <span class="comment"></span><span class="comment">//</span>00033 <span class="comment">// This code is distributed under the GNU Public License</span>00034 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>00035 <span class="comment">//</span>00036 <span class="comment">//*****************************************************************************</span>00037 00038 <span class="preprocessor">#ifndef FIXEDPT_H</span>00039 <span class="preprocessor"></span><span class="preprocessor">#define FIXEDPT_H</span>00040 <span class="preprocessor"></span>00041 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00042 00043 <span class="comment">// constants/macros/typdefs</span>00044 00045 <span class="comment">// functions</span>00046 <span class="comment"></span>00047 <span class="comment">//! fixedptInit() initializes fixed-point math function library</span>00048 <span class="comment"></span><span class="comment">// set the number of bits to use behind the point</span>00049 <span class="keywordtype">void</span> <a class="code" href="fixedpt_8c.html#a1">fixedptInit</a>(u08 fixedPtBits);00050 <span class="comment"></span>00051 <span class="comment">//! convert integer to fixed-point number</span>00052 <span class="comment"></span>s32 <a class="code" href="fixedpt_8c.html#a2">fixedptConvertFromInt</a>(s32 int_number);00053 <span class="comment"></span>00054 <span class="comment">//! convert fixed-point number to integer</span>00055 <span class="comment"></span>s32 <a class="code" href="fixedpt_8c.html#a3">fixedptConvertToInt</a>(s32 fp_number);00056 <span class="comment"></span>00057 <span class="comment">//! add a and b (a+b) with fixed-point math</span>00058 <span class="comment"></span>s32 <a class="code" href="fixedpt_8c.html#a4">fixedptAdd</a>(s32 a, s32 b);00059 <span class="comment"></span>00060 <span class="comment">//! subtract a and b (a-b) with fixed-point math</span>00061 <span class="comment"></span>s32 <a class="code" href="fixedpt_8c.html#a5">fixedptSubtract</a>(s32 a, s32 b);00062 <span class="comment"></span>00063 <span class="comment">//! multiply a and b (a*b) with fixed-point math</span>00064 <span class="comment"></span>s32 <a class="code" href="fixedpt_8c.html#a6">fixedptMultiply</a>(s32 a, s32 b);00065 <span class="comment"></span>00066 <span class="comment">//! divide numer by denom (numer/denom) with fixed-point math</span>00067 <span class="comment"></span>s32 <a class="code" href="fixedpt_8c.html#a7">fixedptDivide</a>(s32 numer, s32 denom);00068 00069 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address></body></html>⌨️ 快捷键说明
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