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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: timer128.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="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</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></div><h1>timer128.c</h1><a href="timer128_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*! \file timer128.c \brief System Timer function library for Mega128. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'timer128.c'</span>00005 <span class="comment">// Title : System Timer function library for Mega128</span>00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2000-2003</span>00007 <span class="comment">// Created : 11/22/2000</span>00008 <span class="comment">// Revised : 02/24/2003</span>00009 <span class="comment">// Version : 1.2</span>00010 <span class="comment">// Target MCU : Atmel AVR Series</span>00011 <span class="comment">// Editor Tabs : 4</span>00012 <span class="comment">//</span>00013 <span class="comment">// This code is distributed under the GNU Public License</span>00014 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>00015 <span class="comment">//</span>00016 <span class="comment">//*****************************************************************************</span>00017 00018 <span class="preprocessor">#ifndef WIN32</span>00019 <span class="preprocessor"></span><span class="preprocessor"> #include <avr/io.h></span>00020 <span class="preprocessor"> #include <avr/signal.h></span>00021 <span class="preprocessor"> #include <avr/interrupt.h></span>00022 <span class="preprocessor"> #include <avr/pgmspace.h></span>00023 <span class="preprocessor"> #include <avr/sleep.h></span>00024 <span class="preprocessor">#endif</span>00025 <span class="preprocessor"></span>00026 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00027 <span class="preprocessor">#include "<a class="code" href="timer128_8h.html">timer128.h</a>"</span>00028 00029 <span class="comment">// Program ROM constants</span>00030 <span class="comment">// the prescale division values stored in order of timer control register index</span>00031 <span class="comment">// STOP, CLK, CLK/8, CLK/64, CLK/256, CLK/1024</span>00032 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> __attribute__ ((progmem)) TimerPrescaleFactor[] = {0,1,8,64,256,1024};00033 <span class="comment">// the prescale division values stored in order of timer control register index</span>00034 <span class="comment">// STOP, CLK, CLK/8, CLK/32, CLK/64, CLK/128, CLK/256, CLK/1024</span>00035 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> __attribute__ ((progmem)) TimerRTCPrescaleFactor[] = {0,1,8,32,64,128,256,1024};00036 00037 <span class="comment">// Global variables</span>00038 <span class="comment">// time registers</span>00039 <span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> TimerPauseReg;00040 <span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Timer0Reg0;00041 <span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Timer0Reg1;00042 <span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Timer2Reg0;00043 <span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> Timer2Reg1;00044 00045 <span class="keyword">typedef</span> void (*voidFuncPtr)(<span class="keywordtype">void</span>);00046 <span class="keyword">volatile</span> <span class="keyword">static</span> voidFuncPtr TimerIntFunc[TIMER_NUM_INTERRUPTS];00047 00048 <span class="comment">// delay for a minimum of <us> microseconds </span>00049 <span class="comment">// the time resolution is dependent on the time the loop takes </span>00050 <span class="comment">// e.g. with 4Mhz and 5 cycles per loop, the resolution is 1.25 us </span>00051 <span class="keywordtype">void</span> delay(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> us) 00052 {00053 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> delay_loops;00054 <span class="keyword">register</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> i;00055 00056 delay_loops = (us+3)/5*CYCLES_PER_US; <span class="comment">// +3 for rounding up (dirty) </span>00057 00058 <span class="comment">// one loop takes 5 cpu cycles </span>00059 <span class="keywordflow">for</span> (i=0; i < delay_loops; i++) {};00060 } 00061 <a name="l00062"></a><a class="code" href="timer128_8c.html#a9">00062</a> <span class="keywordtype">void</span> <a class="code" href="timer_8c.html#a7">timerInit</a>(<span class="keywordtype">void</span>)00063 {00064 u08 intNum;00065 <span class="comment">// detach all user functions from interrupts</span>00066 <span class="keywordflow">for</span>(intNum=0; intNum<TIMER_NUM_INTERRUPTS; intNum++)00067 <a class="code" href="timer128_8h.html#a53">timerDetach</a>(intNum);00068 00069 <span class="comment">// initialize all timers</span>00070 <a class="code" href="timer_8c.html#a8">timer0Init</a>();00071 <a class="code" href="timer_8c.html#a9">timer1Init</a>();00072 timer2Init();00073 timer3Init();00074 <span class="comment">// enable interrupts</span>00075 sei();00076 }00077 <a name="l00078"></a><a class="code" href="timer128_8c.html#a10">00078</a> <span class="keywordtype">void</span> <a class="code" href="timer_8c.html#a8">timer0Init</a>()00079 {00080 <span class="comment">// initialize timer 0</span>00081 <a class="code" href="timer128_8h.html#a44">timer0SetPrescaler</a>( <a class="code" href="timer_8h.html#a20">TIMER0PRESCALE</a> ); <span class="comment">// set prescaler</span>00082 outp(0, TCNT0); <span class="comment">// reset TCNT0</span>00083 sbi(TIMSK, TOIE0); <span class="comment">// enable TCNT0 overflow interrupt</span>00084 00085 <a class="code" href="timer_8c.html#a17">timer0ClearOverflowCount</a>(); <span class="comment">// initialize time registers</span>00086 }00087 <a name="l00088"></a><a class="code" href="timer128_8c.html#a11">00088</a> <span class="keywordtype">void</span> <a class="code" href="timer_8c.html#a9">timer1Init</a>(<span class="keywordtype">void</span>)00089 {00090 <span class="comment">// initialize timer 1</span>00091 <a class="code" href="timer128_8h.html#a45">timer1SetPrescaler</a>( <a class="code" href="timer_8h.html#a21">TIMER1PRESCALE</a> ); <span class="comment">// set prescaler</span>00092 outp(0, TCNT1H); <span class="comment">// reset TCNT1</span>00093 outp(0, TCNT1L);00094 sbi(TIMSK, TOIE1); <span class="comment">// enable TCNT1 overflow</span>00095 }00096 00097 <span class="keywordtype">void</span> timer2Init(<span class="keywordtype">void</span>)00098 {00099 <span class="comment">// initialize timer 2</span>00100 <a class="code" href="timer128_8h.html#a46">timer2SetPrescaler</a>( TIMER2PRESCALE ); <span class="comment">// set prescaler</span>00101 outp(0, TCNT2); <span class="comment">// reset TCNT2</span>00102 sbi(TIMSK, TOIE2); <span class="comment">// enable TCNT2 overflow</span>00103 00104 timer2ClearOverflowCount(); <span class="comment">// initialize time registers</span>00105 }00106 00107 <span class="keywordtype">void</span> timer3Init(<span class="keywordtype">void</span>)00108 {00109 <span class="comment">// initialize timer 3</span>00110 <a class="code" href="timer128_8h.html#a47">timer3SetPrescaler</a>( TIMER3PRESCALE ); <span class="comment">// set prescaler</span>00111 outp(0, TCNT3H); <span class="comment">// reset TCNT3</span>00112 outp(0, TCNT3L);00113 sbi(ETIMSK, TOIE3); <span class="comment">// enable TCNT3 overflow</span>00114 }00115 <a name="l00116"></a><a class="code" href="timer128_8c.html#a14">00116</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a44">timer0SetPrescaler</a>(u08 prescale)00117 {00118 <span class="comment">// set prescaler on timer 0</span>00119 outp( (inp(TCCR0) & ~<a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>) | prescale, TCCR0);00120 }00121 <a name="l00122"></a><a class="code" href="timer128_8c.html#a15">00122</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a45">timer1SetPrescaler</a>(u08 prescale)00123 {00124 <span class="comment">// set prescaler on timer 1</span>00125 outp( (inp(TCCR1B) & ~<a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>) | prescale, TCCR1B);00126 }00127 <a name="l00128"></a><a class="code" href="timer128_8h.html#a46">00128</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a46">timer2SetPrescaler</a>(u08 prescale)00129 {00130 <span class="comment">// set prescaler on timer 2</span>00131 outp( (inp(TCCR2) & ~<a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>) | prescale, TCCR2);00132 }00133 <a name="l00134"></a><a class="code" href="timer128_8h.html#a47">00134</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a47">timer3SetPrescaler</a>(u08 prescale)00135 {00136 <span class="comment">// set prescaler on timer 2</span>00137 outp( (inp(TCCR3B) & ~<a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>) | prescale, TCCR3B);00138 }00139 <a name="l00140"></a><a class="code" href="timer128_8c.html#a18">00140</a> u16 <a class="code" href="timer_8c.html#a12">timer0GetPrescaler</a>(<span class="keywordtype">void</span>)00141 {00142 <span class="comment">// get the current prescaler setting</span>00143 <span class="keywordflow">return</span> (pgm_read_word(TimerPrescaleFactor+(inp(TCCR0) & <a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>)));00144 }00145 <a name="l00146"></a><a class="code" href="timer128_8c.html#a19">00146</a> u16 <a class="code" href="timer_8c.html#a13">timer1GetPrescaler</a>(<span class="keywordtype">void</span>)00147 {00148 <span class="comment">// get the current prescaler setting</span>00149 <span class="keywordflow">return</span> (pgm_read_word(TimerPrescaleFactor+(inp(TCCR1B) & <a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>)));00150 }00151 <a name="l00152"></a><a class="code" href="timer128_8h.html#a50">00152</a> u16 <a class="code" href="timer128_8c.html#a20">timer2GetPrescaler</a>(<span class="keywordtype">void</span>)00153 {00154 <span class="comment">// get the current prescaler setting</span>00155 <span class="keywordflow">return</span> (pgm_read_word(TimerPrescaleFactor+(inp(TCCR2) & <a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>)));00156 }00157 <a name="l00158"></a><a class="code" href="timer128_8h.html#a51">00158</a> u16 <a class="code" href="timer128_8c.html#a21">timer3GetPrescaler</a>(<span class="keywordtype">void</span>)00159 {00160 <span class="comment">// get the current prescaler setting</span>00161 <span class="keywordflow">return</span> (pgm_read_word(TimerPrescaleFactor+(inp(TCCR3B) & <a class="code" href="timer_8h.html#a10">TIMER_PRESCALE_MASK</a>)));00162 }00163 <a name="l00164"></a><a class="code" href="timer128_8c.html#a22">00164</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a52">timerAttach</a>(u08 interruptNum, <span class="keywordtype">void</span> (*userFunc)(<span class="keywordtype">void</span>) )00165 {00166 <span class="comment">// make sure the interrupt number is within bounds</span>00167 <span class="keywordflow">if</span>(interruptNum < TIMER_NUM_INTERRUPTS)00168 {00169 <span class="comment">// set the interrupt function to run</span>00170 <span class="comment">// the supplied user's function</span>00171 TimerIntFunc[interruptNum] = userFunc;00172 }00173 }00174 <a name="l00175"></a><a class="code" href="timer128_8c.html#a23">00175</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a53">timerDetach</a>(u08 interruptNum)00176 {00177 <span class="comment">// make sure the interrupt number is within bounds</span>00178 <span class="keywordflow">if</span>(interruptNum < TIMER_NUM_INTERRUPTS)00179 {00180 <span class="comment">// set the interrupt function to run nothing</span>00181 TimerIntFunc[interruptNum] = 0;00182 }00183 }00184 <a name="l00185"></a><a class="code" href="timer128_8c.html#a24">00185</a> <span class="keywordtype">void</span> <a class="code" href="timer128_8h.html#a54">timerPause</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> pause_ms)00186 {00187 <span class="comment">// pauses for exactly <pause_ms> number of milliseconds</span>00188 u08 timerThres;00189 u32 ticRateHz;00190 u32 pause;00191 00192 <span class="comment">// capture current pause timer value</span>00193 timerThres = inb(TCNT2);00194 <span class="comment">// reset pause timer overflow count</span>00195 TimerPauseReg = 0;00196 <span class="comment">// calculate delay for [pause_ms] milliseconds</span>00197 <span class="comment">// prescaler division = 1<<(PRG_RDB(TimerPrescaleFactor+inp(TCCR2)))</span>00198 ticRateHz = F_CPU/<a class="code" href="timer128_8c.html#a20">timer2GetPrescaler</a>();00199 <span class="comment">// precision management</span>00200 <span class="comment">// prevent overflow and precision underflow</span>00201 <span class="comment">// -could add more conditions to improve accuracy</span>00202 <span class="keywordflow">if</span>( ((ticRateHz < 429497) && (pause_ms <= 10000)) )00203 pause = (pause_ms*ticRateHz)/1000;00204 <span class="keywordflow">else</span>00205 pause = pause_ms*(ticRateHz/1000);00206 00207 <span class="comment">// loop until time expires</span>00208 <span class="keywordflow">while</span>( ((TimerPauseReg<<8) | inb(TCNT2)) < (pause+timerThres) )00209 {00210 <span class="keywordflow">if</span>( TimerPauseReg < (pause>>8));00211 {00212 <span class="comment">// save power by idling the processor</span>00213 set_sleep_mode(SLEEP_MODE_IDLE);00214 sleep_mode();00215 }00216 }00217 }00218 <a name="l00219"></a><a class="code" href="timer128_8c.html#a25">00219</a> <span class="keywordtype">void</span> <a class="code" href="timer_8c.html#a17">timer0ClearOverflowCount</a>(<span class="keywordtype">void</span>)00220 {00221 <span class="comment">// clear the timer overflow counter registers</span>00222 Timer0Reg0 = 0; <span class="comment">// initialize time registers</span>00223 Timer0Reg1 = 0; <span class="comment">// initialize time registers</span>⌨️ 快捷键说明
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