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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> |
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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 : 'spieeprom.c'</span> |
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12 | 00005 <span class="comment">// Title : Interface for standard SPI EEPROM memories</span> |
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13 | 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span> |
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14 | 00007 <span class="comment">// Created : 2004.10.07</span> |
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15 | 00008 <span class="comment">// Revised : 2004.10.07</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">// This code is distributed under the GNU Public License</span> |
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21 | 00014 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span> |
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22 | 00015 <span class="comment">//</span> |
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23 | 00016 <span class="comment">//*****************************************************************************</span> |
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24 | 00017 |
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25 | 00018 <span class="preprocessor">#include <avr/io.h></span> |
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26 | 00019 <span class="preprocessor">#include <avr/interrupt.h></span> |
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27 | 00020 |
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28 | 00021 <span class="preprocessor">#include "<a class="code" href="spi_8h.html">spi.h</a>"</span> |
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29 | 00022 <span class="preprocessor">#include "<a class="code" href="spieeprom_8h.html">spieeprom.h</a>"</span> |
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30 | 00023 |
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31 | 00024 <span class="comment">// functions</span> |
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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>) |
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33 | 00026 { |
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34 | 00027 <span class="comment">// although there is no code here</span> |
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35 | 00028 <span class="comment">// don't forget to initialize the SPI interface itself</span> |
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36 | 00029 <span class="comment">// sbi(DDRB, 0);</span> |
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37 | 00030 } |
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38 | 00031 |
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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) |
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40 | 00033 { |
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41 | 00034 u08 data; |
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42 | 00035 <span class="comment">// cbi(PORTB,0);</span> |
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43 | 00036 <span class="comment">// send command</span> |
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44 | 00037 spiTransferByte(<a class="code" href="spieeprom_8h.html#a0">SPIEEPROM_CMD_READ</a>); |
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45 | 00038 <span class="comment">// send address</span> |
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46 | 00039 spiTransferByte(memAddr>>8); |
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47 | 00040 spiTransferByte(memAddr&0x00FF); |
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48 | 00041 <span class="comment">// read contents of memory address</span> |
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49 | 00042 data = spiTransferByte(0xFF); |
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50 | 00043 <span class="comment">// return data</span> |
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51 | 00044 <span class="keywordflow">return</span> data; |
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52 | 00045 <span class="comment">// sbi(PORTB,0);</span> |
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53 | 00046 } |
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54 | 00047 |
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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) |
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56 | 00049 { |
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57 | 00050 <span class="comment">// wait for any previous write to complete</span> |
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58 | 00051 <span class="keywordflow">while</span>(spieepromReadStatus() & <a class="code" href="spieeprom_8h.html#a6">SPIEEPROM_STATUS_WIP</a>); |
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59 | 00052 |
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60 | 00053 <span class="comment">// cbi(PORTB,0);</span> |
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61 | 00054 <span class="comment">// send command</span> |
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62 | 00055 spiTransferByte(<a class="code" href="spieeprom_8h.html#a1">SPIEEPROM_CMD_WRITE</a>); |
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63 | 00056 <span class="comment">// send address</span> |
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64 | 00057 spiTransferByte(memAddr>>8); |
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65 | 00058 spiTransferByte(memAddr&0x00FF); |
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66 | 00059 <span class="comment">// send data to be written</span> |
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67 | 00060 spiTransferByte(data); |
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68 | 00061 <span class="comment">// sbi(PORTB,0);</span> |
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69 | 00062 } |
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70 | 00063 |
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71 | 00064 <span class="keywordtype">void</span> spieepromWriteEnable(<span class="keywordtype">void</span>) |
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72 | 00065 { |
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73 | 00066 <span class="comment">// cbi(PORTB,0);</span> |
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74 | 00067 <span class="comment">// send command</span> |
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75 | 00068 spiTransferByte(<a class="code" href="spieeprom_8h.html#a2">SPIEEPROM_CMD_WREN</a>); |
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76 | 00069 <span class="comment">// sbi(PORTB,0);</span> |
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77 | 00070 } |
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78 | 00071 |
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79 | 00072 <span class="keywordtype">void</span> spieepromWriteDisable(<span class="keywordtype">void</span>) |
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80 | 00073 { |
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81 | 00074 <span class="comment">// cbi(PORTB,0);</span> |
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82 | 00075 <span class="comment">// send command</span> |
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83 | 00076 spiTransferByte(<a class="code" href="spieeprom_8h.html#a3">SPIEEPROM_CMD_WRDI</a>); |
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84 | 00077 <span class="comment">// sbi(PORTB,0);</span> |
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85 | 00078 } |
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86 | 00079 |
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87 | 00080 u08 spieepromReadStatus(<span class="keywordtype">void</span>) |
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88 | 00081 { |
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89 | 00082 u08 status; |
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90 | 00083 <span class="comment">// cbi(PORTB,0);</span> |
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91 | 00084 <span class="comment">// send command</span> |
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92 | 00085 spiTransferByte(<a class="code" href="spieeprom_8h.html#a4">SPIEEPROM_CMD_RDSR</a>); |
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93 | 00086 <span class="comment">// get status register value</span> |
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94 | 00087 status = spiTransferByte(0xFF); |
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95 | 00088 <span class="comment">// sbi(PORTB,0);</span> |
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96 | 00089 <span class="keywordflow">return</span> status; |
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97 | 00090 } |
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98 | </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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99 | <a href="http://www.doxygen.org/index.html"> |
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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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