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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 ARMlib-LPC2100: membus.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.6 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="globals.html">Globals</a></div><h1>membus.c</h1><a href="membus_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*! \file membus.c \brief Software-driven Memory Bus for ARMmini-LPC210x. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'membus.c'</span>00005 <span class="comment">// Title : Software-driven Memory Bus for ARMmini-LPC210x</span>00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>00007 <span class="comment">// Created : 2004.05.05</span>00008 <span class="comment">// Revised : 2004.07.12</span>00009 <span class="comment">// Version : 0.1</span>00010 <span class="comment">// Target MCU : ARM 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">// This code is distributed under the GNU Public License</span>00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>00019 <span class="comment">//</span>00020 <span class="comment">//*****************************************************************************</span>00021 00022 <span class="preprocessor">#include "lpc210x.h"</span>00023 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00024 <span class="preprocessor">#include "<a class="code" href="timer_8h.html">timer.h</a>"</span>00025 <span class="preprocessor">#include "<a class="code" href="membus_8h.html">membus.h</a>"</span>00026 00027 <span class="keywordtype">void</span> membusInit(<span class="keywordtype">void</span>)00028 {00029 <span class="comment">// setup I/O lines</span>00030 IOCLR = MEMBUS_LATCH;00031 IOSET = MEMBUS_nRD;00032 IOSET = MEMBUS_nWR;00033 <span class="comment">// set inputs</span>00034 IODIR &= ~P015;00035 <span class="comment">// set outputs</span>00036 IODIR |= (MEMBUS_IO | MEMBUS_LATCH | MEMBUS_nRD | MEMBUS_nWR);00037 00038 }00039 00040 uint16_t membusRead(uint16_t addr)00041 {00042 uint16_t data;00043 00044 <span class="comment">// switch bus to output</span>00045 IODIR |= MEMBUS_IO;00046 <span class="comment">// assert address</span>00047 IOCLR = MEMBUS_IO;00048 IOSET = addr<<16;00049 <span class="comment">// latch address</span>00050 IOSET = MEMBUS_LATCH;00051 <span class="comment">// delay</span>00052 MEMBUS_DELAY;00053 IOCLR = MEMBUS_LATCH | MEMBUS_IO;00054 00055 <span class="comment">// switch bus to input</span>00056 IODIR &= ~MEMBUS_IO;00057 <span class="comment">// assert read</span>00058 IOCLR = MEMBUS_nRD;00059 <span class="comment">// delay</span>00060 MEMBUS_DELAY;00061 <span class="comment">// read in data</span>00062 data = IOPIN>>16;00063 <span class="comment">// release read</span>00064 IOSET = MEMBUS_nRD;00065 00066 <span class="keywordflow">return</span> data;00067 }00068 00069 <span class="keywordtype">void</span> membusWrite(uint16_t addr, uint16_t data)00070 {00071 <span class="comment">// switch bus to output</span>00072 IODIR |= MEMBUS_IO;00073 <span class="comment">// assert address</span>00074 IOCLR = MEMBUS_IO;00075 IOSET = addr<<16;00076 <span class="comment">// latch address</span>00077 IOSET = MEMBUS_LATCH;00078 <span class="comment">// delay</span>00079 MEMBUS_DELAY;00080 IOCLR = MEMBUS_LATCH | MEMBUS_IO;00081 00082 <span class="comment">// output data</span>00083 IOCLR = MEMBUS_IO;00084 IOSET = ((uint32_t)data)<<16;00085 <span class="comment">// assert write</span>00086 IOCLR = MEMBUS_nWR;00087 <span class="comment">// delay</span>00088 MEMBUS_DELAY;00089 <span class="comment">// release write</span>00090 IOSET = MEMBUS_nWR;00091 }</pre></div><hr size="1"><address style="align: right;"><small>Generated on Tue Jul 13 03:38:12 2004 for Procyon ARMlib-LPC2100 by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 > </a>1.3.6 </small></address></body></html>⌨️ 快捷键说明
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