?lang_form? ?lang_select? ?lang_submit? ?lang_endform?
{HEADER END}
{BLAME START}

library

?curdirlinks? -

Blame information for rev 6

Line No. Rev Author Line
1 6 kaklik <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2 <html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
3 <title>Procyon AVRlib: fixedpt.c Source File</title>
4 <link href="dox.css" rel="stylesheet" type="text/css">
5 </head><body>
6 <!-- Generated by Doxygen 1.4.2 -->
7 <div class="qindex"><a class="qindex" href="main.html">Main&nbsp;Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data&nbsp;Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File&nbsp;List</a> | <a class="qindex" href="functions.html">Data&nbsp;Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related&nbsp;Pages</a></div>
8 <h1>fixedpt.c</h1><a href="fixedpt_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file fixedpt.c \brief Fixed-point math function library. */</span>
9 00002 <span class="comment">//*****************************************************************************</span>
10 00003 <span class="comment">//</span>
11 00004 <span class="comment">// File Name : 'fixedpt.c'</span>
12 00005 <span class="comment">// Title : Fixed-point math function library</span>
13 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2003</span>
14 00007 <span class="comment">// Created : 2003.01.26</span>
15 00008 <span class="comment">// Revised : 2003.02.02</span>
16 00009 <span class="comment">// Version : 0.1</span>
17 00010 <span class="comment">// Target MCU : Atmel AVR Series</span>
18 00011 <span class="comment">// Editor Tabs : 4</span>
19 00012 <span class="comment">//</span>
20 00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>
21 00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>
22 00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>
23 00016 <span class="comment">//</span>
24 00017 <span class="comment">// This code is distributed under the GNU Public License</span>
25 00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
26 00019 <span class="comment">//</span>
27 00020 <span class="comment">//*****************************************************************************</span>
28 00021
29 00022
30 00023 <span class="preprocessor">#include "<a class="code" href="fixedpt_8h.html">fixedpt.h</a>"</span>
31 00024
32 00025 <span class="comment">// Program ROM constants</span>
33 00026
34 00027 <span class="comment">// Global variables</span>
35 00028 u08 FixedPtBits;
36 00029
37 00030 <span class="comment">// Functions</span>
38 00031
39 00032 <span class="comment">// fixedptInit() initializes fixed-point math function library</span>
40 <a name="l00033"></a><a class="code" href="fixedpt_8h.html#a0">00033</a> <span class="keywordtype">void</span> <a class="code" href="fixedpt_8c.html#a1">fixedptInit</a>(u08 fixedPtBits)
41 00034 {
42 00035 <span class="comment">// set the number of bits to use behind the point</span>
43 00036 FixedPtBits = fixedPtBits;
44 00037 }
45 00038
46 <a name="l00039"></a><a class="code" href="fixedpt_8h.html#a1">00039</a> s32 <a class="code" href="fixedpt_8c.html#a2">fixedptConvertFromInt</a>(s32 int_number)
47 00040 {
48 00041 <span class="comment">// convert integer to fixed-point number</span>
49 00042 <span class="keywordflow">return</span> (int_number&lt;&lt;FixedPtBits);
50 00043 }
51 00044
52 <a name="l00045"></a><a class="code" href="fixedpt_8h.html#a2">00045</a> s32 <a class="code" href="fixedpt_8c.html#a3">fixedptConvertToInt</a>(s32 fp_number)
53 00046 {
54 00047 <span class="comment">// convert fixed-point number to integer</span>
55 00048 <span class="comment">// do rounding</span>
56 00049 <span class="keywordflow">if</span>( fp_number &amp; 1&lt;&lt;(FixedPtBits-1) )
57 00050 {
58 00051 <span class="comment">// bit behind the point was a '1'</span>
59 00052 <span class="comment">// round up to next higher integer</span>
60 00053 <span class="keywordflow">return</span> (fp_number&gt;&gt;FixedPtBits)+1;
61 00054 }
62 00055 <span class="keywordflow">else</span>
63 00056 {
64 00057 <span class="comment">// bit behind the point was a '0'</span>
65 00058 <span class="comment">// round down (truncate) to next lower integer</span>
66 00059 <span class="keywordflow">return</span> (fp_number&gt;&gt;FixedPtBits);
67 00060 }
68 00061 }
69 00062
70 <a name="l00063"></a><a class="code" href="fixedpt_8h.html#a3">00063</a> s32 <a class="code" href="fixedpt_8c.html#a4">fixedptAdd</a>(s32 a, s32 b)
71 00064 {
72 00065 <span class="comment">// add a and b (a+b) with fixed-point math</span>
73 00066 <span class="keywordflow">return</span> a+b;
74 00067 }
75 00068
76 <a name="l00069"></a><a class="code" href="fixedpt_8h.html#a4">00069</a> s32 <a class="code" href="fixedpt_8c.html#a5">fixedptSubtract</a>(s32 a, s32 b)
77 00070 {
78 00071 <span class="comment">// subtract a and b (a-b) with fixed-point math</span>
79 00072 <span class="keywordflow">return</span> a-b;
80 00073 }
81 00074
82 <a name="l00075"></a><a class="code" href="fixedpt_8h.html#a5">00075</a> s32 <a class="code" href="fixedpt_8c.html#a6">fixedptMultiply</a>(s32 a, s32 b)
83 00076 {
84 00077 <span class="comment">// multiply a and b (a*b) with fixed-point math</span>
85 00078 <span class="keywordflow">return</span> (a*b)&gt;&gt;FixedPtBits;
86 00079 }
87 00080
88 <a name="l00081"></a><a class="code" href="fixedpt_8h.html#a6">00081</a> s32 <a class="code" href="fixedpt_8c.html#a7">fixedptDivide</a>(s32 numer, s32 denom)
89 00082 {
90 00083 <span class="comment">// divide numer by denom (numer/denom) with fixed-point math</span>
91 00084 <span class="keywordflow">return</span> (numer&lt;&lt;FixedPtBits)/denom;
92 00085 }
93 </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by&nbsp;
94 <a href="http://www.doxygen.org/index.html">
95 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
96 </body>
97 </html>
{BLAME END}
{FOOTER START}

Powered by WebSVN v2.8.3