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3 <title>Procyon AVRlib: spieeprom.c Source File</title>
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8 <h1>spieeprom.c</h1><a href="spieeprom_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file spieeprom.c \brief Interface for standard SPI EEPROM memories. */</span>
9 00002 <span class="comment">//*****************************************************************************</span>
10 00003 <span class="comment">//</span>
11 00004 <span class="comment">// File Name : 'spieeprom.c'</span>
12 00005 <span class="comment">// Title : Interface for standard SPI EEPROM memories</span>
13 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>
14 00007 <span class="comment">// Created : 2004.10.07</span>
15 00008 <span class="comment">// Revised : 2004.10.07</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">// This code is distributed under the GNU Public License</span>
21 00014 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
22 00015 <span class="comment">//</span>
23 00016 <span class="comment">//*****************************************************************************</span>
24 00017
25 00018 <span class="preprocessor">#include &lt;avr/io.h&gt;</span>
26 00019 <span class="preprocessor">#include &lt;avr/interrupt.h&gt;</span>
27 00020
28 00021 <span class="preprocessor">#include "<a class="code" href="spi_8h.html">spi.h</a>"</span>
29 00022 <span class="preprocessor">#include "<a class="code" href="spieeprom_8h.html">spieeprom.h</a>"</span>
30 00023
31 00024 <span class="comment">// functions</span>
32 <a name="l00025"></a><a class="code" href="spieeprom_8h.html#a11">00025</a> <span class="keywordtype">void</span> <a class="code" href="spieeprom_8c.html#a0">spieepromInit</a>(<span class="keywordtype">void</span>)
33 00026 {
34 00027 <span class="comment">// although there is no code here</span>
35 00028 <span class="comment">// don't forget to initialize the SPI interface itself</span>
36 00029 <span class="comment">// sbi(DDRB, 0);</span>
37 00030 }
38 00031
39 <a name="l00032"></a><a class="code" href="spieeprom_8h.html#a12">00032</a> u08 <a class="code" href="spieeprom_8c.html#a1">spieepromReadByte</a>(u32 memAddr)
40 00033 {
41 00034 u08 data;
42 00035 <span class="comment">// cbi(PORTB,0);</span>
43 00036 <span class="comment">// send command</span>
44 00037 spiTransferByte(<a class="code" href="spieeprom_8h.html#a0">SPIEEPROM_CMD_READ</a>);
45 00038 <span class="comment">// send address</span>
46 00039 spiTransferByte(memAddr&gt;&gt;8);
47 00040 spiTransferByte(memAddr&amp;0x00FF);
48 00041 <span class="comment">// read contents of memory address</span>
49 00042 data = spiTransferByte(0xFF);
50 00043 <span class="comment">// return data</span>
51 00044 <span class="keywordflow">return</span> data;
52 00045 <span class="comment">// sbi(PORTB,0);</span>
53 00046 }
54 00047
55 <a name="l00048"></a><a class="code" href="spieeprom_8h.html#a13">00048</a> <span class="keywordtype">void</span> <a class="code" href="spieeprom_8c.html#a2">spieepromWriteByte</a>(u32 memAddr, u08 data)
56 00049 {
57 00050 <span class="comment">// wait for any previous write to complete</span>
58 00051 <span class="keywordflow">while</span>(spieepromReadStatus() &amp; <a class="code" href="spieeprom_8h.html#a6">SPIEEPROM_STATUS_WIP</a>);
59 00052
60 00053 <span class="comment">// cbi(PORTB,0);</span>
61 00054 <span class="comment">// send command</span>
62 00055 spiTransferByte(<a class="code" href="spieeprom_8h.html#a1">SPIEEPROM_CMD_WRITE</a>);
63 00056 <span class="comment">// send address</span>
64 00057 spiTransferByte(memAddr&gt;&gt;8);
65 00058 spiTransferByte(memAddr&amp;0x00FF);
66 00059 <span class="comment">// send data to be written</span>
67 00060 spiTransferByte(data);
68 00061 <span class="comment">// sbi(PORTB,0);</span>
69 00062 }
70 00063
71 00064 <span class="keywordtype">void</span> spieepromWriteEnable(<span class="keywordtype">void</span>)
72 00065 {
73 00066 <span class="comment">// cbi(PORTB,0);</span>
74 00067 <span class="comment">// send command</span>
75 00068 spiTransferByte(<a class="code" href="spieeprom_8h.html#a2">SPIEEPROM_CMD_WREN</a>);
76 00069 <span class="comment">// sbi(PORTB,0);</span>
77 00070 }
78 00071
79 00072 <span class="keywordtype">void</span> spieepromWriteDisable(<span class="keywordtype">void</span>)
80 00073 {
81 00074 <span class="comment">// cbi(PORTB,0);</span>
82 00075 <span class="comment">// send command</span>
83 00076 spiTransferByte(<a class="code" href="spieeprom_8h.html#a3">SPIEEPROM_CMD_WRDI</a>);
84 00077 <span class="comment">// sbi(PORTB,0);</span>
85 00078 }
86 00079
87 00080 u08 spieepromReadStatus(<span class="keywordtype">void</span>)
88 00081 {
89 00082 u08 status;
90 00083 <span class="comment">// cbi(PORTB,0);</span>
91 00084 <span class="comment">// send command</span>
92 00085 spiTransferByte(<a class="code" href="spieeprom_8h.html#a4">SPIEEPROM_CMD_RDSR</a>);
93 00086 <span class="comment">// get status register value</span>
94 00087 status = spiTransferByte(0xFF);
95 00088 <span class="comment">// sbi(PORTB,0);</span>
96 00089 <span class="keywordflow">return</span> status;
97 00090 }
98 </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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100 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
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