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<h1>spiflash.c</h1><a href="spiflash_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file spiflash.c \brief SPI Flash Memory Driver (M25Pxx/AT25Fxxx/etc). */</span>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name : 'spiflash.c'</span>
00005 <span class="comment">// Title : SPI Flash Memory Driver (M25Pxx/AT25Fxxx/etc)</span>
00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2006</span>
00007 <span class="comment">// Created : 2006-04-15</span>
00008 <span class="comment">// Revised : 2006-07-02</span>
00009 <span class="comment">// Version : 0.1</span>
00010 <span class="comment">// Target MCU : AVR processors</span>
00011 <span class="comment">// Editor Tabs : 4</span>
00012 <span class="comment">//</span>
00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>
00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>
00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>
00016 <span class="comment">//</span>
00017 <span class="comment">//*****************************************************************************</span>
00018
00019 <span class="comment">// system includes</span>
00020 <span class="preprocessor">#include "avr/io.h"</span>
00021 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>
00022
00023 <span class="comment">// library includes</span>
00024 <span class="preprocessor">#include "<a class="code" href="spi_8h.html">spi.h</a>"</span>
00025 <span class="preprocessor">#include "<a class="code" href="spiflash_8h.html">spiflash.h</a>"</span>
00026
00027 <span class="preprocessor">#define SPIFLASH_CONFIG_CS DDRB |= (1<<0)</span>
00028 <span class="preprocessor"></span><span class="preprocessor">#define SPIFLASH_ASSERT_CS PORTB &= (1<<0)</span>
00029 <span class="preprocessor"></span><span class="preprocessor">#define SPIFLASH_RELEASE_CS PORTB |= (1<<0)</span>
00030 <span class="preprocessor"></span>
00031 <span class="comment">// functions</span>
00032 <span class="keywordtype">void</span> spiflashInit(<span class="keywordtype">void</span>)
00033 {
00034 <span class="comment">// initialize spi</span>
00035 spiInit();
00036 <span class="comment">// initialize chip select</span>
00037 SPIFLASH_RELEASE_CS;
00038 SPIFLASH_CONFIG_CS;
00039 }
00040
00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> spiflashGetID(<span class="keywordtype">void</span>)
00042 {
00043 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> id;
00044
00045 SPIFLASH_ASSERT_CS;
00046 spiByte(0, SPIFLASH_CMD_RDID, 0);
00047 <span class="keywordtype">id</span> = spiByte(0, 0x00, 0)<<8;
00048 <span class="keywordtype">id</span> |= spiByte(0, 0x00, 1);
00049 SPIFLASH_RELEASE_CS;
00050
00051 <span class="keywordflow">return</span> id;
00052 }
00053
00054 <span class="keywordtype">void</span> spiflashChipErase(<span class="keywordtype">void</span>)
00055 {
00056 <span class="comment">// enable write</span>
00057 SPIFLASH_ASSERT_CS;
00058 spiByte(0, SPIFLASH_CMD_WREN, 1);
00059 SPIFLASH_RELEASE_CS;
00060
00061 <span class="comment">// clock out dummy byte to waste time</span>
00062 spiByte(0, 0x00, 1);
00063
00064 <span class="comment">// do chip erase</span>
00065 SPIFLASH_ASSERT_CS;
00066 spiByte(0, SPIFLASH_CMD_CHIPERASE, 1);
00067 SPIFLASH_RELEASE_CS;
00068
00069 <span class="comment">// clock out dummy byte to waste time</span>
00070 spiByte(0, 0x00, 1);
00071
00072 <span class="comment">// wait until write is done</span>
00073 SPIFLASH_ASSERT_CS;
00074 spiByte(0, SPIFLASH_CMD_RDSR, 0);
00075 <span class="keywordflow">while</span>(spiByte(0, 0x00, 0) & SPIFLASH_STATUS_BUSY);
00076 SPIFLASH_RELEASE_CS;
00077 }
00078
00079 <span class="keywordtype">void</span> spiflashRead(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> nbytes, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *data)
00080 {
00081 <span class="comment">// begin read</span>
00082 SPIFLASH_ASSERT_CS;
00083 <span class="comment">// issue read command</span>
00084 spiByte(0, SPIFLASH_CMD_READ, 0);
00085 <span class="comment">// send address</span>
00086 spiByte(0, addr>>16, 0);
00087 spiByte(0, addr>>8, 0);
00088 spiByte(0, addr>>0, 0);
00089 <span class="comment">// read data</span>
00090 <span class="keywordflow">while</span>(nbytes--)
00091 *data++ = spiByte(0, 0x00, 0);
00092 <span class="comment">// end read</span>
00093 SPIFLASH_RELEASE_CS;
00094 }
00095
00096 <span class="keywordtype">void</span> spiflashWrite(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> nbytes, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *data)
00097 {
00098 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> page;
00099 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i;
00100 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> pagelen;
00101
00102 <span class="comment">// loop through pages to be programmed</span>
00103 <span class="keywordflow">for</span>(page=0; page<((nbytes+SPIFLASH_PAGESIZE-1)>>8); page++)
00104 {
00105 <span class="comment">// program this page</span>
00106
00107 <span class="comment">// enable write</span>
00108 SPIFLASH_ASSERT_CS;
00109 spiByte(0, SPIFLASH_CMD_WREN, 1);
00110 SPIFLASH_RELEASE_CS;
00111
00112 <span class="comment">// clock out dummy byte to waste time</span>
00113 spiByte(0, 0x00, 1);
00114
00115 <span class="comment">// begin write</span>
00116 SPIFLASH_ASSERT_CS;
00117 <span class="comment">// issue write command</span>
00118 spiByte(0, SPIFLASH_CMD_PAGEPROG, 0);
00119 <span class="comment">// send address</span>
00120 spiByte(0, addr>>16, 0);
00121 spiByte(0, addr>>8, 0);
00122 spiByte(0, addr>>0, 0);
00123 <span class="comment">// program exactly the number of bytes requested</span>
00124 <span class="keywordflow">if</span>( ((page<<8)+SPIFLASH_PAGESIZE) <= nbytes)
00125 pagelen = SPIFLASH_PAGESIZE;
00126 <span class="keywordflow">else</span>
00127 pagelen = nbytes-(page<<8);
00128 <span class="comment">// transfer data</span>
00129 <span class="keywordflow">for</span>(i=0; i<pagelen; i++)
00130 spiByte(0, *data++, 0);
00131 <span class="comment">// end write</span>
00132 SPIFLASH_RELEASE_CS;
00133
00134 <span class="comment">// clock out dummy byte to waste time</span>
00135 spiByte(0, 0x00, 1);
00136
00137 <span class="comment">// wait until write is done</span>
00138 SPIFLASH_ASSERT_CS;
00139 spiByte(0, SPIFLASH_CMD_RDSR, 0);
00140 <span class="keywordflow">while</span>(spiByte(0, 0x00, 0) & SPIFLASH_STATUS_BUSY);
00141 SPIFLASH_RELEASE_CS;
00142
00143 <span class="comment">// clock out dummy byte to waste time</span>
00144 spiByte(0, 0x00, 1);
00145 }
00146 }
</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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