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<h1>extint.c</h1><a href="extint_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file extint.c \brief External-Interrupt function library. */</span>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name : 'extint.c'</span>
00005 <span class="comment">// Title : External-Interrupt function library</span>
00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2002-2004</span>
00007 <span class="comment">// Created : 5/10/2002</span>
00008 <span class="comment">// Revised : 11/16/2004</span>
00009 <span class="comment">// Version : 1.0</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">// Notes: This library provides convenient standardized configuration and</span>
00014 <span class="comment">// access to external interrupts. The library is designed to make</span>
00015 <span class="comment">// it possible to write code that uses external interrupts without</span>
00016 <span class="comment">// digging into the processor datasheets to find register names and</span>
00017 <span class="comment">// bit-defines. The library also strives to allow code which uses</span>
00018 <span class="comment">// external interrupts to more easily cross-compile between different</span>
00019 <span class="comment">// microcontrollers.</span>
00020 <span class="comment">//</span>
00021 <span class="comment">// NOTE: Using this library has certain advantages, but also adds</span>
00022 <span class="comment">// overhead and latency to interrupt servicing. If the smallest</span>
00023 <span class="comment">// code size or fastest possible latency is needed, do NOT use this</span>
00024 <span class="comment">// library; link your interrupts directly.</span>
00025 <span class="comment">//</span>
00026 <span class="comment">//*****************************************************************************</span>
00027
00028 <span class="preprocessor">#include <avr/io.h></span>
00029 <span class="preprocessor">#include <avr/interrupt.h></span>
00030
00031 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>
00032 <span class="preprocessor">#include "<a class="code" href="extint_8h.html">extint.h</a>"</span>
00033
00034 <span class="comment">// Global variables</span>
00035 <span class="keyword">typedef</span> void (*voidFuncPtr)(void);
00036 <span class="keyword">volatile</span> <span class="keyword">static</span> voidFuncPtr ExtIntFunc[EXTINT_NUM_INTERRUPTS];
00037
00038 <span class="comment">// functions</span>
00039 <span class="comment"></span>
00040 <span class="comment">//! initializes extint library</span>
<a name="l00041"></a><a class="code" href="extint_8h.html#a14">00041</a> <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="extint_8c.html#a2">extintInit</a>(<span class="keywordtype">void</span>)
00042 {
00043 u08 intNum;
00044 <span class="comment">// detach all user functions from interrupts</span>
00045 <span class="keywordflow">for</span>(intNum=0; intNum<EXTINT_NUM_INTERRUPTS; intNum++)
00046 <a class="code" href="extint_8c.html#a5">extintDetach</a>(intNum);
00047
00048 }
00049 <span class="comment"></span>
00050 <span class="comment">//! Configure external interrupt trigger</span>
00051 <span class="comment"></span><span class="comment">// NOTE: this function is not complete!!!</span>
<a name="l00052"></a><a class="code" href="extint_8h.html#a15">00052</a> <span class="keywordtype">void</span> <a class="code" href="extint_8c.html#a3">extintConfigure</a>(u08 interruptNum, u08 configuration)
00053 {
00054 <span class="keywordflow">if</span>(interruptNum == <a class="code" href="extint_8h.html#a0">EXTINT0</a>)
00055 {
00056 MCUCR &= ~((1<<ISC01) | (1<<ISC00));
00057 MCUCR |= configuration;
00058 }
00059 <span class="preprocessor"> #ifdef SIG_INTERRUPT1</span>
00060 <span class="preprocessor"></span> <span class="keywordflow">else</span> <span class="keywordflow">if</span>(interruptNum == <a class="code" href="extint_8h.html#a1">EXTINT1</a>)
00061 {
00062 MCUCR &= ~((1<<ISC11) | (1<<ISC10));
00063 MCUCR |= configuration<<2;
00064 }
00065 <span class="preprocessor"> #endif</span>
00066 <span class="preprocessor"></span><span class="preprocessor"> #ifdef SIG_INTERRUPT2</span>
00067 <span class="preprocessor"></span> <span class="keywordflow">else</span> <span class="keywordflow">if</span>(interruptNum == <a class="code" href="extint_8h.html#a2">EXTINT2</a>)
00068 {
00069 <span class="keywordflow">if</span>(configuration == <a class="code" href="extint_8h.html#a11">EXTINT_EDGE_RISING</a>)
00070 sbi(MCUCSR, ISC2);
00071 <span class="keywordflow">else</span>
00072 cbi(MCUCSR, ISC2);
00073 }
00074 <span class="preprocessor"> #endif</span>
00075 <span class="preprocessor"></span> <span class="comment">// need to handle a lot more cases</span>
00076 <span class="comment">// and differences between processors.</span>
00077 <span class="comment">// looking for clean way to do it...</span>
00078 }
00079 <span class="comment"></span>
00080 <span class="comment">//! Attach a user function to an external interrupt</span>
<a name="l00081"></a><a class="code" href="extint_8h.html#a16">00081</a> <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="extint_8c.html#a4">extintAttach</a>(u08 interruptNum, <span class="keywordtype">void</span> (*userHandler)(<span class="keywordtype">void</span>) )
00082 {
00083 <span class="comment">// make sure the interrupt number is within bounds</span>
00084 <span class="keywordflow">if</span>(interruptNum < EXTINT_NUM_INTERRUPTS)
00085 {
00086 <span class="comment">// set the interrupt function to run</span>
00087 <span class="comment">// the supplied user's function</span>
00088 ExtIntFunc[interruptNum] = userHandler;
00089 }
00090 }
00091 <span class="comment"></span>
00092 <span class="comment">//! Detach a user function from an external interrupt</span>
<a name="l00093"></a><a class="code" href="extint_8h.html#a17">00093</a> <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="extint_8c.html#a5">extintDetach</a>(u08 interruptNum)
00094 {
00095 <span class="comment">// make sure the interrupt number is within bounds</span>
00096 <span class="keywordflow">if</span>(interruptNum < EXTINT_NUM_INTERRUPTS)
00097 {
00098 <span class="comment">// set the interrupt function to run</span>
00099 <span class="comment">// the supplied user's function</span>
00100 ExtIntFunc[interruptNum] = 0;
00101 }
00102 }
00103 <span class="comment"></span>
00104 <span class="comment">//! Interrupt handler for INT0</span>
<a name="l00105"></a><a class="code" href="extint_8c.html#a6">00105</a> <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT0)
00106 {
00107 <span class="comment">// if a user function is defined, execute it</span>
00108 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a0">EXTINT0</a>])
00109 ExtIntFunc[<a class="code" href="extint_8h.html#a0">EXTINT0</a>]();
00110 }
00111
00112 <span class="preprocessor">#ifdef SIG_INTERRUPT1</span>
00113 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT1</span>
00114 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT1)
00115 {
00116 <span class="comment">// if a user function is defined, execute it</span>
00117 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a1">EXTINT1</a>])
00118 ExtIntFunc[<a class="code" href="extint_8h.html#a1">EXTINT1</a>]();
00119 }
00120 <span class="preprocessor">#endif</span>
00121 <span class="preprocessor"></span>
00122 <span class="preprocessor">#ifdef SIG_INTERRUPT2</span>
00123 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT2</span>
00124 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT2)
00125 {
00126 <span class="comment">// if a user function is defined, execute it</span>
00127 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a2">EXTINT2</a>])
00128 ExtIntFunc[<a class="code" href="extint_8h.html#a2">EXTINT2</a>]();
00129 }
00130 <span class="preprocessor">#endif</span>
00131 <span class="preprocessor"></span>
00132 <span class="preprocessor">#ifdef SIG_INTERRUPT3</span>
00133 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT3</span>
00134 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT3)
00135 {
00136 <span class="comment">// if a user function is defined, execute it</span>
00137 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a3">EXTINT3</a>])
00138 ExtIntFunc[<a class="code" href="extint_8h.html#a3">EXTINT3</a>]();
00139 }
00140 <span class="preprocessor">#endif</span>
00141 <span class="preprocessor"></span>
00142 <span class="preprocessor">#ifdef SIG_INTERRUPT4</span>
00143 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT4</span>
00144 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT4)
00145 {
00146 <span class="comment">// if a user function is defined, execute it</span>
00147 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a4">EXTINT4</a>])
00148 ExtIntFunc[<a class="code" href="extint_8h.html#a4">EXTINT4</a>]();
00149 }
00150 <span class="preprocessor">#endif</span>
00151 <span class="preprocessor"></span>
00152 <span class="preprocessor">#ifdef SIG_INTERRUPT5</span>
00153 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT5</span>
00154 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT5)
00155 {
00156 <span class="comment">// if a user function is defined, execute it</span>
00157 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a5">EXTINT5</a>])
00158 ExtIntFunc[<a class="code" href="extint_8h.html#a5">EXTINT5</a>]();
00159 }
00160 <span class="preprocessor">#endif</span>
00161 <span class="preprocessor"></span>
00162 <span class="preprocessor">#ifdef SIG_INTERRUPT6</span>
00163 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT6</span>
00164 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT6)
00165 {
00166 <span class="comment">// if a user function is defined, execute it</span>
00167 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a6">EXTINT6</a>])
00168 ExtIntFunc[<a class="code" href="extint_8h.html#a6">EXTINT6</a>]();
00169 }
00170 <span class="preprocessor">#endif</span>
00171 <span class="preprocessor"></span>
00172 <span class="preprocessor">#ifdef SIG_INTERRUPT7</span>
00173 <span class="preprocessor"></span><span class="comment">//! Interrupt handler for INT7</span>
00174 <span class="comment"></span>EXTINT_INTERRUPT_HANDLER(SIG_INTERRUPT7)
00175 {
00176 <span class="comment">// if a user function is defined, execute it</span>
00177 <span class="keywordflow">if</span>(ExtIntFunc[<a class="code" href="extint_8h.html#a7">EXTINT7</a>])
00178 ExtIntFunc[<a class="code" href="extint_8h.html#a7">EXTINT7</a>]();
00179 }
00180 <span class="preprocessor">#endif</span>
00181 <span class="preprocessor"></span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by
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