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| 3 | <title>Procyon AVRlib: param.c Source File</title> |
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| 8 | <h1>param.c</h1><a href="param_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file param.c \brief EEPROM Parameter Storage Library. */</span> |
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| 9 | 00002 <span class="comment">//*****************************************************************************</span> |
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| 10 | 00003 <span class="comment">//</span> |
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| 11 | 00004 <span class="comment">// File Name : 'param.c'</span> |
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| 12 | 00005 <span class="comment">// Title : EEPROM Parameter Storage Library</span> |
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| 13 | 00006 <span class="comment">// Author : Pascal Stang (c)2005</span> |
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| 14 | 00007 <span class="comment">// Created : 9/16/2005</span> |
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| 15 | 00008 <span class="comment">// Revised : 9/20/2005</span> |
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| 16 | 00009 <span class="comment">// Version : 0.1</span> |
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| 17 | 00010 <span class="comment">// Target MCU : Atmel AVR series</span> |
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| 18 | 00011 <span class="comment">// Editor Tabs : 4</span> |
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| 19 | 00012 <span class="comment">//</span> |
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| 20 | 00013 <span class="comment">//*****************************************************************************</span> |
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| 21 | 00014 |
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| 22 | 00015 <span class="preprocessor">#include <avr/eeprom.h></span> |
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| 23 | 00016 |
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| 24 | 00017 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span> |
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| 25 | 00018 |
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| 26 | <a name="l00019"></a><a class="code" href="group__param.html#ga1">00019</a> u08 <a class="code" href="group__param.html#ga1">paramLoad</a>(u08* parameters, u08* memaddr, u16 sizebytes) |
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| 27 | 00020 { |
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| 28 | 00021 u16 i; |
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| 29 | 00022 u08 checksum_stored=0; |
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| 30 | 00023 u08 checksum=0; |
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| 31 | 00024 |
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| 32 | 00025 <span class="comment">// load parameters</span> |
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| 33 | 00026 eeprom_read_block(parameters, memaddr, sizebytes); |
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| 34 | 00027 <span class="comment">// load checksum</span> |
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| 35 | 00028 eeprom_read_block(&checksum_stored, memaddr+sizebytes, <span class="keyword">sizeof</span>(u08)); |
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| 36 | 00029 |
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| 37 | 00030 <span class="comment">// calculate own checksum</span> |
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| 38 | 00031 <span class="keywordflow">for</span>(i=0;i<sizebytes;i++) |
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| 39 | 00032 checksum += parameters[i]; |
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| 40 | 00033 checksum = ~checksum; |
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| 41 | 00034 |
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| 42 | 00035 <span class="keywordflow">if</span>(checksum == checksum_stored) |
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| 43 | 00036 <span class="keywordflow">return</span> TRUE; |
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| 44 | 00037 <span class="keywordflow">else</span> |
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| 45 | 00038 <span class="keywordflow">return</span> FALSE; |
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| 46 | 00039 } |
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| 47 | 00040 |
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| 48 | <a name="l00041"></a><a class="code" href="group__param.html#ga0">00041</a> <span class="keywordtype">void</span> <a class="code" href="group__param.html#ga0">paramStore</a>(u08* parameters, u08* memaddr, u16 sizebytes) |
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| 49 | 00042 { |
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| 50 | 00043 u16 i; |
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| 51 | 00044 u08 checksum=0; |
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| 52 | 00045 |
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| 53 | 00046 <span class="comment">// calculate checksum</span> |
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| 54 | 00047 <span class="keywordflow">for</span>(i=0;i<sizebytes;i++) |
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| 55 | 00048 checksum += parameters[i]; |
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| 56 | 00049 checksum = ~checksum; |
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| 57 | 00050 |
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| 58 | 00051 <span class="comment">// store parameters</span> |
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| 59 | 00052 eeprom_write_block(parameters, memaddr, sizebytes); |
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| 60 | 00053 <span class="comment">// store checksum</span> |
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| 61 | 00054 eeprom_write_block(&checksum, memaddr+sizebytes, <span class="keyword">sizeof</span>(u08)); |
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| 62 | 00055 } |
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| 63 | 00056 |
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| 64 | </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by |
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| 65 | <a href="http://www.doxygen.org/index.html"> |
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| 66 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address> |
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