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<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>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name : 'spieeprom.c'</span>
00005 <span class="comment">// Title : Interface for standard SPI EEPROM memories</span>
00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>
00007 <span class="comment">// Created : 2004.10.07</span>
00008 <span class="comment">// Revised : 2004.10.07</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">// This code is distributed under the GNU Public License</span>
00014 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
00015 <span class="comment">//</span>
00016 <span class="comment">//*****************************************************************************</span>
00017
00018 <span class="preprocessor">#include <avr/io.h></span>
00019 <span class="preprocessor">#include <avr/interrupt.h></span>
00020
00021 <span class="preprocessor">#include "<a class="code" href="spi_8h.html">spi.h</a>"</span>
00022 <span class="preprocessor">#include "<a class="code" href="spieeprom_8h.html">spieeprom.h</a>"</span>
00023
00024 <span class="comment">// functions</span>
<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>)
00026 {
00027 <span class="comment">// although there is no code here</span>
00028 <span class="comment">// don't forget to initialize the SPI interface itself</span>
00029 <span class="comment">// sbi(DDRB, 0);</span>
00030 }
00031
<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)
00033 {
00034 u08 data;
00035 <span class="comment">// cbi(PORTB,0);</span>
00036 <span class="comment">// send command</span>
00037 spiTransferByte(<a class="code" href="spieeprom_8h.html#a0">SPIEEPROM_CMD_READ</a>);
00038 <span class="comment">// send address</span>
00039 spiTransferByte(memAddr>>8);
00040 spiTransferByte(memAddr&0x00FF);
00041 <span class="comment">// read contents of memory address</span>
00042 data = spiTransferByte(0xFF);
00043 <span class="comment">// return data</span>
00044 <span class="keywordflow">return</span> data;
00045 <span class="comment">// sbi(PORTB,0);</span>
00046 }
00047
<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)
00049 {
00050 <span class="comment">// wait for any previous write to complete</span>
00051 <span class="keywordflow">while</span>(spieepromReadStatus() & <a class="code" href="spieeprom_8h.html#a6">SPIEEPROM_STATUS_WIP</a>);
00052
00053 <span class="comment">// cbi(PORTB,0);</span>
00054 <span class="comment">// send command</span>
00055 spiTransferByte(<a class="code" href="spieeprom_8h.html#a1">SPIEEPROM_CMD_WRITE</a>);
00056 <span class="comment">// send address</span>
00057 spiTransferByte(memAddr>>8);
00058 spiTransferByte(memAddr&0x00FF);
00059 <span class="comment">// send data to be written</span>
00060 spiTransferByte(data);
00061 <span class="comment">// sbi(PORTB,0);</span>
00062 }
00063
00064 <span class="keywordtype">void</span> spieepromWriteEnable(<span class="keywordtype">void</span>)
00065 {
00066 <span class="comment">// cbi(PORTB,0);</span>
00067 <span class="comment">// send command</span>
00068 spiTransferByte(<a class="code" href="spieeprom_8h.html#a2">SPIEEPROM_CMD_WREN</a>);
00069 <span class="comment">// sbi(PORTB,0);</span>
00070 }
00071
00072 <span class="keywordtype">void</span> spieepromWriteDisable(<span class="keywordtype">void</span>)
00073 {
00074 <span class="comment">// cbi(PORTB,0);</span>
00075 <span class="comment">// send command</span>
00076 spiTransferByte(<a class="code" href="spieeprom_8h.html#a3">SPIEEPROM_CMD_WRDI</a>);
00077 <span class="comment">// sbi(PORTB,0);</span>
00078 }
00079
00080 u08 spieepromReadStatus(<span class="keywordtype">void</span>)
00081 {
00082 u08 status;
00083 <span class="comment">// cbi(PORTB,0);</span>
00084 <span class="comment">// send command</span>
00085 spiTransferByte(<a class="code" href="spieeprom_8h.html#a4">SPIEEPROM_CMD_RDSR</a>);
00086 <span class="comment">// get status register value</span>
00087 status = spiTransferByte(0xFF);
00088 <span class="comment">// sbi(PORTB,0);</span>
00089 <span class="keywordflow">return</span> status;
00090 }
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