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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: processor.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>processor.c</h1><a href="processor_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*! \file processor.c \brief LPC2100 Processor Initialization and Support. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'processor.c'</span>00005 <span class="comment">// Title : LPC2100 Processor Initialization and Support</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 00024 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00025 <span class="preprocessor">#include "<a class="code" href="processor_8h.html">processor.h</a>"</span>00026 00027 <span class="keywordtype">void</span> processorInit(<span class="keywordtype">void</span>)00028 {00029 <span class="comment">// set PLL multiplier & divisor.</span>00030 <span class="comment">// values computed from config.h</span>00031 PLLCFG = PLLCFG_MSEL | PLLCFG_PSEL;00032 00033 <span class="comment">// enable PLL</span>00034 PLLCON = PLLCON_PLLE;00035 PLLFEED = 0xAA; <span class="comment">// Make it happen. These two updates</span>00036 PLLFEED = 0x55; <span class="comment">// MUST occur in sequence.</span>00037 00038 <span class="comment">// wait for PLL lock</span>00039 <span class="keywordflow">while</span> (!(PLLSTAT & PLLSTAT_LOCK))00040 <span class="keywordflow">continue</span>;00041 00042 <span class="comment">// enable & connect PLL</span>00043 PLLCON = PLLCON_PLLE | PLLCON_PLLC;00044 PLLFEED = 0xAA; <span class="comment">// Make it happen. These two updates</span>00045 PLLFEED = 0x55; <span class="comment">// MUST occur in sequence.</span>00046 00047 <span class="comment">// setup & enable the MAM</span>00048 MAMTIM = MAMTIM_CYCLES;00049 MAMCR = MAMCR_FULL;00050 00051 <span class="comment">// set the peripheral bus speed</span>00052 <span class="comment">// value computed from global.h</span>00053 VPBDIV = VPBDIV_VALUE; <span class="comment">// set the peripheral bus clock speed</span>00054 }00055 00056 00057 00058 00059 <span class="preprocessor">#define IRQ_MASK 0x00000080</span>00060 <span class="preprocessor"></span><span class="preprocessor">#define FIQ_MASK 0x00000040</span>00061 <span class="preprocessor"></span><span class="preprocessor">#define INT_MASK (IRQ_MASK | FIQ_MASK)</span>00062 <span class="preprocessor"></span>00063 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> __get_cpsr(<span class="keywordtype">void</span>)00064 {00065 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> retval;00066 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">" mrs %0, cpsr"</span> : <span class="stringliteral">"=r"</span> (retval) : <span class="comment">/* no inputs */</span> );00067 <span class="keywordflow">return</span> retval;00068 }00069 00070 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> __set_cpsr(<span class="keywordtype">unsigned</span> val)00071 {00072 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">" msr cpsr, %0"</span> : <span class="comment">/* no outputs */</span> : <span class="stringliteral">"r"</span> (val) );00073 }00074 00075 <span class="keywordtype">unsigned</span> disableIRQ(<span class="keywordtype">void</span>)00076 {00077 <span class="keywordtype">unsigned</span> _cpsr;00078 00079 _cpsr = __get_cpsr();00080 __set_cpsr(_cpsr | IRQ_MASK);00081 <span class="keywordflow">return</span> _cpsr;00082 }00083 00084 <span class="keywordtype">unsigned</span> restoreIRQ(<span class="keywordtype">unsigned</span> oldCPSR)00085 {00086 <span class="keywordtype">unsigned</span> _cpsr;00087 00088 _cpsr = __get_cpsr();00089 __set_cpsr((_cpsr & ~IRQ_MASK) | (oldCPSR & IRQ_MASK));00090 <span class="keywordflow">return</span> _cpsr;00091 }00092 00093 <span class="keywordtype">unsigned</span> enableIRQ(<span class="keywordtype">void</span>)00094 {00095 <span class="keywordtype">unsigned</span> _cpsr;00096 00097 _cpsr = __get_cpsr();00098 __set_cpsr(_cpsr & ~IRQ_MASK);00099 <span class="keywordflow">return</span> _cpsr;00100 }00101 00102 <span class="keywordtype">unsigned</span> disableFIQ(<span class="keywordtype">void</span>)00103 {00104 <span class="keywordtype">unsigned</span> _cpsr;00105 00106 _cpsr = __get_cpsr();00107 __set_cpsr(_cpsr | FIQ_MASK);00108 <span class="keywordflow">return</span> _cpsr;00109 }00110 00111 <span class="keywordtype">unsigned</span> restoreFIQ(<span class="keywordtype">unsigned</span> oldCPSR)00112 {00113 <span class="keywordtype">unsigned</span> _cpsr;00114 00115 _cpsr = __get_cpsr();00116 __set_cpsr((_cpsr & ~FIQ_MASK) | (oldCPSR & FIQ_MASK));00117 <span class="keywordflow">return</span> _cpsr;00118 }00119 00120 <span class="keywordtype">unsigned</span> enableFIQ(<span class="keywordtype">void</span>)00121 {00122 <span class="keywordtype">unsigned</span> _cpsr;00123 00124 _cpsr = __get_cpsr();00125 __set_cpsr(_cpsr & ~FIQ_MASK);00126 <span class="keywordflow">return</span> _cpsr;00127 }</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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