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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon AVRlib: spiflash.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.2 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div><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 <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address></body></html>⌨️ 快捷键说明
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