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<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>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name    : 'param.c'</span>
00005 <span class="comment">// Title        : EEPROM Parameter Storage Library</span>
00006 <span class="comment">// Author       : Pascal Stang (c)2005</span>
00007 <span class="comment">// Created      : 9/16/2005</span>
00008 <span class="comment">// Revised      : 9/20/2005</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">//*****************************************************************************</span>
00014 
00015 <span class="preprocessor">#include &lt;avr/eeprom.h&gt;</span>
00016 
00017 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>
00018 
<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)
00020 {
00021     u16 i;
00022     u08 checksum_stored=0;
00023     u08 checksum=0;
00024 
00025     <span class="comment">// load parameters</span>
00026     eeprom_read_block(parameters, memaddr, sizebytes);
00027     <span class="comment">// load checksum</span>
00028     eeprom_read_block(&amp;checksum_stored, memaddr+sizebytes, <span class="keyword">sizeof</span>(u08));
00029 
00030     <span class="comment">// calculate own checksum</span>
00031     <span class="keywordflow">for</span>(i=0;i&lt;sizebytes;i++)
00032         checksum += parameters[i];
00033     checksum = ~checksum;
00034     
00035     <span class="keywordflow">if</span>(checksum == checksum_stored)
00036         <span class="keywordflow">return</span> TRUE;
00037     <span class="keywordflow">else</span>
00038         <span class="keywordflow">return</span> FALSE;
00039 }
00040 
<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)
00042 {
00043     u16 i;
00044     u08 checksum=0;
00045 
00046     <span class="comment">// calculate checksum</span>
00047     <span class="keywordflow">for</span>(i=0;i&lt;sizebytes;i++)
00048         checksum += parameters[i];
00049     checksum = ~checksum;
00050 
00051     <span class="comment">// store parameters</span>
00052     eeprom_write_block(parameters, memaddr, sizebytes);
00053     <span class="comment">// store checksum</span>
00054     eeprom_write_block(&amp;checksum, memaddr+sizebytes, <span class="keyword">sizeof</span>(u08));
00055 }
00056 
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by&nbsp;
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