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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: timer.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>timer.c</h1><a href="timer_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*! \file timer.c \brief Timer Support Library for LPC2100. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'timer.c'</span>00005 <span class="comment">// Title : Timer Support Library for LPC2100</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="processor_8h.html">processor.h</a>"</span>00024 00025 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00026 <span class="preprocessor">#include "<a class="code" href="timer_8h.html">timer.h</a>"</span>00027 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span>00028 00029 <span class="keyword">typedef</span> void (*voidFuncPtr)(<span class="keywordtype">void</span>);00030 <span class="keyword">volatile</span> <span class="keyword">static</span> voidFuncPtr TimerIntrFunc[TIMER_NUM_INTERRUPTS];00031 00032 <span class="keyword">volatile</span> u32 Timer0Pause;00033 <span class="keyword">volatile</span> u32 Timer0OverflowCount;00034 <span class="keyword">volatile</span> u32 Timer1OverflowCount;00035 00036 <span class="keywordtype">void</span> delay(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> d)00037 { 00038 <span class="keywordflow">for</span>(; d; --d)00039 {00040 <span class="keyword">asm</span> <span class="keyword">volatile</span> (<span class="stringliteral">"nop"</span>);00041 }00042 }00043 00044 00045 <span class="keywordtype">void</span> timerInit(<span class="keywordtype">void</span>)00046 {00047 u08 intNum;00048 <span class="comment">// detach all user functions from interrupts</span>00049 <span class="keywordflow">for</span>(intNum=0; intNum<TIMER_NUM_INTERRUPTS; intNum++)00050 <a class="code" href="timer_8h.html#a21">timerDetach</a>(intNum);00051 00052 <span class="comment">// initialize timer0</span>00053 timer0Init();00054 <span class="comment">// initialize timer1</span>00055 timer1Init();00056 <span class="comment">// enable interrupts</span>00057 enableIRQ();00058 }00059 00060 <span class="keywordtype">void</span> timer0Init(<span class="keywordtype">void</span>)00061 {00062 <span class="comment">// setup timer0</span>00063 <span class="comment">// set prescaler</span>00064 timer1PrescalerSet(1);00065 <span class="comment">// reset timer</span>00066 T0TCR = TCR_RESET;00067 delay(10);00068 <span class="comment">// start timer</span>00069 T0TCR = TCR_ENABLE;00070 00071 <span class="comment">// setup timer0 for IRQ</span>00072 <span class="comment">// set interrupt as IRQ</span>00073 VICIntSelect &= ~(1<<VIC_TIMER0);00074 <span class="comment">// assign VIC slot</span>00075 VICVectCntl4 = VIC_ENABLE | VIC_TIMER0;00076 VICVectAddr4 = (u32)timer0Service;00077 <span class="comment">// enable interrupt</span>00078 VICIntEnable |= (1<<VIC_TIMER0);00079 00080 <span class="comment">// setup MR0 value</span>00081 T0MR0 = CCLK/1000;00082 <span class="comment">// enable timer0 interrupt and reset on MR0 match</span>00083 T0MCR |= TMCR_MR0_I | TMCR_MR0_R;00084 00085 }00086 00087 <span class="keywordtype">void</span> timer1Init(<span class="keywordtype">void</span>)00088 {00089 <span class="comment">// setup timer1</span>00090 <span class="comment">// set prescaler</span>00091 timer1PrescalerSet(1);00092 <span class="comment">// reset timer</span>00093 T1TCR = TCR_RESET;00094 delay(10);00095 <span class="comment">// start timer</span>00096 T1TCR = TCR_ENABLE;00097 00098 <span class="comment">// setup timer1 for IRQ</span>00099 <span class="comment">// set interrupt as IRQ</span>00100 VICIntSelect &= ~(1<<VIC_TIMER1);00101 <span class="comment">// assign VIC slot</span>00102 VICVectCntl5 = VIC_ENABLE | VIC_TIMER1;00103 VICVectAddr5 = (u32)timer1Service;00104 <span class="comment">// enable interrupt</span>00105 VICIntEnable |= (1<<VIC_TIMER1);00106 }00107 00108 <span class="keywordtype">void</span> timer0PrescalerSet(u32 clockDiv)00109 {00110 <span class="comment">// timer0 increments every PR+1 cycles</span>00111 <span class="comment">// subtract 1 so the argument is a true division ratio</span>00112 T0PR = clockDiv-1;00113 }00114 <span class="keywordtype">void</span> timer1PrescalerSet(u32 clockDiv)00115 {00116 <span class="comment">// timer1 increments every PR+1 cycles</span>00117 <span class="comment">// subtract 1 so the argument is a true division ratio</span>00118 T1PR = clockDiv-1;00119 }00120 <a name="l00121"></a><a class="code" href="timer_8h.html#a20">00121</a> <span class="keywordtype">void</span> <a class="code" href="timer_8h.html#a20">timerAttach</a>(u08 interruptNum, <span class="keywordtype">void</span> (*userFunc)(<span class="keywordtype">void</span>) )00122 {00123 <span class="comment">// make sure the interrupt number is within bounds</span>00124 <span class="keywordflow">if</span>(interruptNum < TIMER_NUM_INTERRUPTS)00125 {00126 <span class="comment">// set the interrupt function to run</span>00127 <span class="comment">// the supplied user's function</span>00128 TimerIntrFunc[interruptNum] = userFunc;00129 }00130 }00131 <a name="l00132"></a><a class="code" href="timer_8h.html#a21">00132</a> <span class="keywordtype">void</span> <a class="code" href="timer_8h.html#a21">timerDetach</a>(u08 interruptNum)00133 {00134 <span class="comment">// make sure the interrupt number is within bounds</span>00135 <span class="keywordflow">if</span>(interruptNum < TIMER_NUM_INTERRUPTS)00136 {00137 <span class="comment">// set the interrupt function to run nothing</span>00138 TimerIntrFunc[interruptNum] = 0;00139 }00140 }00141 00142 <span class="keywordtype">void</span> timerPause(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> pause_ms)00143 {00144 Timer0Pause = pause_ms;00145 00146 <span class="keywordflow">while</span>(Timer0Pause);00147 }00148 00149 <span class="keywordtype">void</span> timer0ClearOverflowCount(<span class="keywordtype">void</span>)00150 {00151 Timer0OverflowCount = 0;00152 }00153 00154 u32 timer0GetOverflowCount(<span class="keywordtype">void</span>)00155 {00156 <span class="keywordflow">return</span> Timer0OverflowCount;00157 }00158 00159 <span class="keywordtype">void</span> timer1ClearOverflowCount(<span class="keywordtype">void</span>)00160 {00161 Timer1OverflowCount = 0;00162 }00163 00164 u32 timer1GetOverflowCount(<span class="keywordtype">void</span>)00165 {00166 <span class="keywordflow">return</span> Timer1OverflowCount;00167 }00168 00169 <span class="keywordtype">void</span> timer0Match0Set(u32 value)00170 {00171 T0MR0 = value;00172 }00173 00174 <span class="keywordtype">void</span> timer0Match1Set(u32 value)00175 {00176 T0MR1 = value;00177 }00178 00179 <span class="keywordtype">void</span> timer1Match0Set(u32 value)00180 {00181 T1MR0 = value;00182 }00183 00184 <span class="keywordtype">void</span> timer1Match1Set(u32 value)00185 {00186 T1MR1 = value;00187 }00188 00189 00190 <span class="keywordtype">void</span> timer0Capture0Init(<span class="keywordtype">int</span> on)00191 {00192 <span class="comment">// setup timer0 capture0</span>00193 <span class="keywordflow">if</span>(on)00194 {00195 <span class="comment">// pin select</span>00196 PINSEL0 &= ~(3<<4); <span class="comment">// clear pin select bits for P0.2 -> GPIO</span>00197 PINSEL0 |= (2<<4); <span class="comment">// set pin select bits for P0.2 -> Capture0.0</span>00198 <span class="comment">// enable timer0 interrupt on rising edge of CR0 capture</span>00199 T0CCR |= TCCR_CR0_I | TCCR_CR0_R;00200 }00201 <span class="keywordflow">else</span>00202 {00203 <span class="comment">// pin select</span>00204 PINSEL0 &= ~(3<<4); <span class="comment">// clear pin select bits for P0.2 -> GPIO</span>00205 <span class="comment">// disable timer0 interrupt on rising edge of CR0 capture</span>00206 T0CCR &= ~(TCCR_CR0_I | TCCR_CR0_R);00207 }00208 }00209 00210 <span class="keywordtype">void</span> timer0Capture1Init(<span class="keywordtype">int</span> on)00211 {00212 <span class="comment">// setup timer0 capture1</span>00213 <span class="keywordflow">if</span>(on)00214 {00215 <span class="comment">// pin select</span>00216 PINSEL0 &= ~(3<<8); <span class="comment">// clear pin select bits for P0.4 -> GPIO</span>00217 PINSEL0 |= (2<<8); <span class="comment">// set pin select bits for P0.4 -> Capture0.1</span>00218 <span class="comment">// enable timer0 interrupt on rising edge of CR1 capture</span>00219 T0CCR |= TCCR_CR1_I | TCCR_CR1_R;00220 }00221 <span class="keywordflow">else</span>00222 {00223 <span class="comment">// pin select</span>00224 PINSEL0 &= ~(3<<8); <span class="comment">// clear pin select bits for P0.4 -> GPIO</span>00225 <span class="comment">// disable timer0 interrupt on rising edge of CR1 capture</span>00226 T0CCR &= ~(TCCR_CR1_I | TCCR_CR1_R);00227 }00228 }00229 00230 <span class="keywordtype">void</span> timer0Service(<span class="keywordtype">void</span>)00231 {00232 ISR_ENTRY();00233 00234 <span class="comment">// check the interrupt sources</span>00235 <span class="keywordflow">if</span>(T0IR & TIR_MR0I)00236 {00237 <span class="comment">// clear MR0 Interrupt</span>00238 T0IR |= TIR_MR0I;00239 <span class="keywordflow">if</span>(Timer0Pause)00240 Timer0Pause--;00241 Timer0OverflowCount++;00242 <span class="comment">// if a user function is defined, execute it</span>00243 <span class="keywordflow">if</span>(TimerIntrFunc[TIMER0MATCH0_INT])00244 TimerIntrFunc[TIMER0MATCH0_INT]();00245 }00246 <span class="keywordflow">else</span> <span class="keywordflow">if</span>(T0IR & TIR_CR0I)00247 {00248 <span class="comment">// clear CR0 Interrupt</span>00249 T0IR |= TIR_CR0I;00250 <span class="comment">// if a user function is defined, execute it</span>00251 <span class="keywordflow">if</span>(TimerIntrFunc[TIMER0CAPTURE0_INT])00252 TimerIntrFunc[TIMER0CAPTURE0_INT]();00253 }00254 <span class="keywordflow">else</span> <span class="keywordflow">if</span>(T0IR & TIR_CR1I)00255 {00256 <span class="comment">// clear CR1 Interrupt</span>00257 T0IR |= TIR_CR1I;00258 <span class="comment">// if a user function is defined, execute it</span>00259 <span class="keywordflow">if</span>(TimerIntrFunc[TIMER0CAPTURE1_INT])00260 TimerIntrFunc[TIMER0CAPTURE1_INT]();00261 }00262 00263 VICSoftIntClear = (1<<VIC_TIMER0);00264 VICVectAddr = 0x00000000; <span class="comment">// clear this interrupt from the VIC</span>00265 ISR_EXIT(); <span class="comment">// recover registers and return</span>00266 }00267 00268 <span class="keywordtype">void</span> timer1Service(<span class="keywordtype">void</span>)00269 {00270 ISR_ENTRY();00271 00272 <span class="keywordflow">if</span>(T0IR & TIR_MR0I)00273 {00274 <span class="comment">// clear MR0 Interrupt</span>00275 T1IR |= TIR_MR0I;00276 Timer1OverflowCount++;00277 <span class="comment">// if a user function is defined, execute it</span>00278 <span class="keywordflow">if</span>(TimerIntrFunc[TIMER1MATCH0_INT])00279 TimerIntrFunc[TIMER1MATCH0_INT]();00280 }00281 00282 VICSoftIntClear = (1<<VIC_TIMER1);00283 VICVectAddr = 0x00000000; <span class="comment">// clear this interrupt from the VIC</span>00284 ISR_EXIT(); <span class="comment">// recover registers and return</span>00285 }</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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