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   <div id="projectname">LCD Library&#160;<span id="projectnumber">1.2.0</span></div>
   <div id="projectbrief">LCD Library - LCD control class hierarchy library. Drop in replacement for the LiquidCrystal Library.</div>
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<div class="title">/Users/fmalpartida/development/ardWorkspace/LiquidCrystal_I2C/LiquiCrystal_I2C/LiquidCrystal.cpp</div>  </div>
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<a href="_liquid_crystal_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00002"></a>00002 <span class="comment">// Created by Francisco Malpartida on 20/08/11.</span>
<a name="l00003"></a>00003 <span class="comment">// Copyright 2011 - Under creative commons license 3.0:</span>
<a name="l00004"></a>00004 <span class="comment">//        Attribution-ShareAlike CC BY-SA</span>
<a name="l00005"></a>00005 <span class="comment">//</span>
<a name="l00006"></a>00006 <span class="comment">// This software is furnished &quot;as is&quot;, without technical support, and with no </span>
<a name="l00007"></a>00007 <span class="comment">// warranty, express or implied, as to its usefulness for any purpose.</span>
<a name="l00008"></a>00008 <span class="comment">//</span>
<a name="l00009"></a>00009 <span class="comment">// Thread Safe: No</span>
<a name="l00010"></a>00010 <span class="comment">// Extendable: Yes</span>
<a name="l00011"></a>00011 <span class="comment">//</span>
<a name="l00012"></a>00012 <span class="comment">// @file LiquidCrystal.cpp</span>
<a name="l00013"></a>00013 <span class="comment">// This file implements a basic liquid crystal library that comes as standard</span>
<a name="l00014"></a>00014 <span class="comment">// in the Arduino SDK.</span>
<a name="l00015"></a>00015 <span class="comment">// </span>
<a name="l00016"></a>00016 <span class="comment">// @brief </span>
<a name="l00017"></a>00017 <span class="comment">// This is a basic implementation of the LiquidCrystal library of the</span>
<a name="l00018"></a>00018 <span class="comment">// Arduino SDK. The original library has been reworked in such a way that </span>
<a name="l00019"></a>00019 <span class="comment">// this class implements the all methods to command an LCD based</span>
<a name="l00020"></a>00020 <span class="comment">// on the Hitachi HD44780 and compatible chipsets using the parallel port of</span>
<a name="l00021"></a>00021 <span class="comment">// the LCD (4 bit and 8 bit).</span>
<a name="l00022"></a>00022 <span class="comment">//</span>
<a name="l00023"></a>00023 <span class="comment">// The functionality provided by this class and its base class is identical</span>
<a name="l00024"></a>00024 <span class="comment">// to the original functionality of the Arduino LiquidCrystal library.</span>
<a name="l00025"></a>00025 <span class="comment">//</span>
<a name="l00026"></a>00026 <span class="comment">//</span>
<a name="l00027"></a>00027 <span class="comment">// @author F. Malpartida - fmalpartida@gmail.com</span>
<a name="l00028"></a>00028 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00030"></a>00030 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00031"></a>00031 <span class="preprocessor">#include &lt;inttypes.h&gt;</span>
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 <span class="preprocessor">#if (ARDUINO &lt;  100)</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span><span class="preprocessor">#include &lt;WProgram.h&gt;</span>
<a name="l00035"></a>00035 <span class="preprocessor">#else</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#include &lt;Arduino.h&gt;</span>
<a name="l00037"></a>00037 <span class="preprocessor">#endif</span>
<a name="l00038"></a>00038 <span class="preprocessor"></span><span class="preprocessor">#include &lt;<a class="code" href="_liquid_crystal_8h.html">LiquidCrystal.h</a>&gt;</span>
<a name="l00039"></a>00039 
<a name="l00040"></a>00040 <span class="comment">// CONSTANT  definitions</span>
<a name="l00041"></a>00041 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00042"></a><a class="code" href="_liquid_crystal_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">00042</a> <span class="preprocessor">#define LCD_NOBACKLIGHT 0xFF</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span>
<a name="l00044"></a>00044 <span class="comment">// STATIC helper functions</span>
<a name="l00045"></a>00045 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00046"></a>00046 
<a name="l00047"></a>00047 
<a name="l00048"></a>00048 <span class="comment">// CONSTRUCTORS</span>
<a name="l00049"></a>00049 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00050"></a><a class="code" href="class_liquid_crystal.html#a30e3d865c4b4a003a36cb45903f93644">00050</a> <a class="code" href="class_liquid_crystal.html#a49d2bd8d26031a1c83bcbd73978a1686">LiquidCrystal::LiquidCrystal</a>(uint8_t rs, uint8_t rw, uint8_t enable,
<a name="l00051"></a>00051                              uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
<a name="l00052"></a>00052                              uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054    init(<a class="code" href="_l_c_d_8h.html#a57d84af8cf61ceee4eb91db77889f071">LCD_8BIT</a>, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 
<a name="l00057"></a><a class="code" href="class_liquid_crystal.html#a49d2bd8d26031a1c83bcbd73978a1686">00057</a> <a class="code" href="class_liquid_crystal.html#a49d2bd8d26031a1c83bcbd73978a1686">LiquidCrystal::LiquidCrystal</a>(uint8_t rs, uint8_t enable,
<a name="l00058"></a>00058                              uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
<a name="l00059"></a>00059                              uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061    init(<a class="code" href="_l_c_d_8h.html#a57d84af8cf61ceee4eb91db77889f071">LCD_8BIT</a>, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063 
<a name="l00064"></a><a class="code" href="class_liquid_crystal.html#a0a0a8dfa7a2e775a031fd65f5c6366ec">00064</a> <a class="code" href="class_liquid_crystal.html#a49d2bd8d26031a1c83bcbd73978a1686">LiquidCrystal::LiquidCrystal</a>(uint8_t rs, uint8_t rw, uint8_t enable,
<a name="l00065"></a>00065                              uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
<a name="l00066"></a>00066 {
<a name="l00067"></a>00067    init(<a class="code" href="_l_c_d_8h.html#a31e1c14e8c2845dec3301f0ebd36b43c">LCD_4BIT</a>, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069 
<a name="l00070"></a><a class="code" href="class_liquid_crystal.html#a23124e6dd5ac4a9b6147629b96e91953">00070</a> <a class="code" href="class_liquid_crystal.html#a49d2bd8d26031a1c83bcbd73978a1686">LiquidCrystal::LiquidCrystal</a>(uint8_t rs,  uint8_t enable,
<a name="l00071"></a>00071                              uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
<a name="l00072"></a>00072 {
<a name="l00073"></a>00073    init(<a class="code" href="_l_c_d_8h.html#a31e1c14e8c2845dec3301f0ebd36b43c">LCD_4BIT</a>, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075 
<a name="l00076"></a>00076 
<a name="l00077"></a>00077 
<a name="l00078"></a>00078 <span class="comment">// PUBLIC METHODS</span>
<a name="l00079"></a>00079 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00080"></a>00080 
<a name="l00081"></a>00081 <span class="comment">/************ low level data pushing commands **********/</span>
<a name="l00082"></a>00082 
<a name="l00083"></a>00083 <span class="comment">// send</span>
<a name="l00084"></a><a class="code" href="class_liquid_crystal.html#a56142f8b3753bedd133e4139e5eb5089">00084</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal.html#a56142f8b3753bedd133e4139e5eb5089">LiquidCrystal::send</a>(uint8_t value, uint8_t mode) 
<a name="l00085"></a>00085 {
<a name="l00086"></a>00086    digitalWrite( _rs_pin, mode );
<a name="l00087"></a>00087    
<a name="l00088"></a>00088    <span class="comment">// if there is a RW pin indicated, set it low to Write</span>
<a name="l00089"></a>00089    <span class="comment">// ---------------------------------------------------</span>
<a name="l00090"></a>00090    <span class="keywordflow">if</span> (_rw_pin != 255) 
<a name="l00091"></a>00091    { 
<a name="l00092"></a>00092       digitalWrite(_rw_pin, LOW);
<a name="l00093"></a>00093    }
<a name="l00094"></a>00094    
<a name="l00095"></a>00095    <span class="keywordflow">if</span> (<a class="code" href="class_l_c_d.html#aef093ba3f8e1016267b40ac235a0fa0f">_displayfunction</a> &amp; <a class="code" href="_l_c_d_8h.html#a59a57ca857dae5d89eb5f2a38c4ac6f0">LCD_8BITMODE</a>)
<a name="l00096"></a>00096    {
<a name="l00097"></a>00097       writeNbits(value, 8); 
<a name="l00098"></a>00098    } 
<a name="l00099"></a>00099    <span class="keywordflow">else</span> 
<a name="l00100"></a>00100    {
<a name="l00101"></a>00101       writeNbits ( value &gt;&gt; 4, 4 );
<a name="l00102"></a>00102       writeNbits ( value, 4 );
<a name="l00103"></a>00103    }
<a name="l00104"></a>00104    <a class="code" href="_l_c_d_8h.html#a6eac41e4be58d7736ac0c19de225c0dc">waitUsec</a> ( <a class="code" href="_liquid_crystal_8h.html#adebff0f00a59c9f9863bc196938d5726">EXEC_TIME</a> ); <span class="comment">// wait for the command to execute by the LCD</span>
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 
<a name="l00107"></a>00107 <span class="comment">//</span>
<a name="l00108"></a>00108 <span class="comment">// setBackligh</span>
<a name="l00109"></a><a class="code" href="class_liquid_crystal.html#a170c6ed996f3e84bf63dcd5cb1471428">00109</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal.html#a170c6ed996f3e84bf63dcd5cb1471428">LiquidCrystal::setBacklight</a> ( uint8_t mode )
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111    <span class="keywordflow">if</span> ( _backlightPin != <a class="code" href="_liquid_crystal_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">LCD_NOBACKLIGHT</a> )
<a name="l00112"></a>00112    {
<a name="l00113"></a>00113       digitalWrite ( _backlightPin, mode );
<a name="l00114"></a>00114    }
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116 
<a name="l00117"></a>00117 <span class="comment">//</span>
<a name="l00118"></a>00118 <span class="comment">// setBacklightPin</span>
<a name="l00119"></a><a class="code" href="class_liquid_crystal.html#aa78ed97905615b34e685170c086e3d9d">00119</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal.html#aa78ed97905615b34e685170c086e3d9d">LiquidCrystal::setBacklightPin</a> ( uint8_t pin )
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121    pinMode ( pin, OUTPUT ); <span class="comment">// Difine the backlight pin as output</span>
<a name="l00122"></a>00122    _backlightPin = pin;
<a name="l00123"></a>00123 }
<a name="l00124"></a>00124 
<a name="l00125"></a>00125 <span class="comment">// PRIVATE METHODS</span>
<a name="l00126"></a>00126 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00127"></a>00127 
<a name="l00128"></a>00128 
<a name="l00129"></a>00129 <span class="comment">// init</span>
<a name="l00130"></a>00130 <span class="keywordtype">void</span> LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
<a name="l00131"></a>00131                          uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
<a name="l00132"></a>00132                          uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
<a name="l00133"></a>00133 {
<a name="l00134"></a>00134    uint8_t i;
<a name="l00135"></a>00135    
<a name="l00136"></a>00136    <span class="comment">// Initialize the IO pins</span>
<a name="l00137"></a>00137    <span class="comment">// -----------------------</span>
<a name="l00138"></a>00138    
<a name="l00139"></a>00139    _rs_pin = rs;
<a name="l00140"></a>00140    _rw_pin = rw;
<a name="l00141"></a>00141    _enable_pin = enable;
<a name="l00142"></a>00142    
<a name="l00143"></a>00143    _data_pins[0] = d0;
<a name="l00144"></a>00144    _data_pins[1] = d1;
<a name="l00145"></a>00145    _data_pins[2] = d2;
<a name="l00146"></a>00146    _data_pins[3] = d3; 
<a name="l00147"></a>00147    _data_pins[4] = d4;
<a name="l00148"></a>00148    _data_pins[5] = d5;
<a name="l00149"></a>00149    _data_pins[6] = d6;
<a name="l00150"></a>00150    _data_pins[7] = d7;
<a name="l00151"></a>00151    
<a name="l00152"></a>00152    <span class="comment">// Initialize the IO port direction to OUTPUT</span>
<a name="l00153"></a>00153    <span class="comment">// ------------------------------------------</span>
<a name="l00154"></a>00154    
<a name="l00155"></a>00155    <span class="keywordflow">for</span> ( i = 0; i &lt; 4; i++ )
<a name="l00156"></a>00156    {
<a name="l00157"></a>00157       pinMode ( _data_pins[i], OUTPUT );
<a name="l00158"></a>00158    }
<a name="l00159"></a>00159    
<a name="l00160"></a>00160    <span class="comment">// Initialize the rest of the ports if it is an 8bit controlled LCD</span>
<a name="l00161"></a>00161    <span class="comment">// ----------------------------------------------------------------</span>
<a name="l00162"></a>00162    
<a name="l00163"></a>00163    <span class="keywordflow">if</span> ( !fourbitmode )
<a name="l00164"></a>00164    {
<a name="l00165"></a>00165       <span class="keywordflow">for</span> ( i = 4; i &lt; 8; i++ )
<a name="l00166"></a>00166       {
<a name="l00167"></a>00167          pinMode ( _data_pins[i], OUTPUT );
<a name="l00168"></a>00168       }
<a name="l00169"></a>00169    }
<a name="l00170"></a>00170    pinMode(_rs_pin, OUTPUT);
<a name="l00171"></a>00171    
<a name="l00172"></a>00172    <span class="comment">// we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#</span>
<a name="l00173"></a>00173    <span class="keywordflow">if</span> (_rw_pin != 255) 
<a name="l00174"></a>00174    { 
<a name="l00175"></a>00175       pinMode(_rw_pin, OUTPUT);
<a name="l00176"></a>00176    }
<a name="l00177"></a>00177    
<a name="l00178"></a>00178    pinMode(_enable_pin, OUTPUT);
<a name="l00179"></a>00179    
<a name="l00180"></a>00180    <span class="comment">// Initialise displaymode functions to defaults: LCD_1LINE and LCD_5x8DOTS</span>
<a name="l00181"></a>00181    <span class="comment">// -------------------------------------------------------------------------</span>
<a name="l00182"></a>00182    <span class="keywordflow">if</span> (fourbitmode)
<a name="l00183"></a>00183       <a class="code" href="class_l_c_d.html#aef093ba3f8e1016267b40ac235a0fa0f">_displayfunction</a> = <a class="code" href="_l_c_d_8h.html#ab8c35d355d2372090c7a347e961c9224">LCD_4BITMODE</a> | <a class="code" href="_l_c_d_8h.html#a8c85cf88d8af66a47c42249d81c94641">LCD_1LINE</a> | <a class="code" href="_l_c_d_8h.html#a9ef57e724c1b846dae0f531aff6fb464">LCD_5x8DOTS</a>;
<a name="l00184"></a>00184    <span class="keywordflow">else</span> 
<a name="l00185"></a>00185       <a class="code" href="class_l_c_d.html#aef093ba3f8e1016267b40ac235a0fa0f">_displayfunction</a> = <a class="code" href="_l_c_d_8h.html#a59a57ca857dae5d89eb5f2a38c4ac6f0">LCD_8BITMODE</a> | <a class="code" href="_l_c_d_8h.html#a8c85cf88d8af66a47c42249d81c94641">LCD_1LINE</a> | <a class="code" href="_l_c_d_8h.html#a9ef57e724c1b846dae0f531aff6fb464">LCD_5x8DOTS</a>;
<a name="l00186"></a>00186    
<a name="l00187"></a>00187    <span class="comment">// Now we pull both RS and R/W low to begin commands</span>
<a name="l00188"></a>00188    digitalWrite(_rs_pin, LOW);
<a name="l00189"></a>00189    digitalWrite(_enable_pin, LOW);
<a name="l00190"></a>00190    
<a name="l00191"></a>00191    <span class="keywordflow">if</span> (_rw_pin != 255) 
<a name="l00192"></a>00192    { 
<a name="l00193"></a>00193       digitalWrite(_rw_pin, LOW);
<a name="l00194"></a>00194    }
<a name="l00195"></a>00195    
<a name="l00196"></a>00196    <span class="comment">// Initialise the backlight pin no nothing</span>
<a name="l00197"></a>00197    _backlightPin = <a class="code" href="_liquid_crystal_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">LCD_NOBACKLIGHT</a>;
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199 
<a name="l00200"></a>00200 <span class="comment">//</span>
<a name="l00201"></a>00201 <span class="comment">// pulseEnable</span>
<a name="l00202"></a>00202 <span class="keywordtype">void</span> LiquidCrystal::pulseEnable(<span class="keywordtype">void</span>) 
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204    <span class="comment">// There is no need for the delays, since the digitalWrite operation</span>
<a name="l00205"></a>00205    <span class="comment">// takes longer.</span>
<a name="l00206"></a>00206    digitalWrite(_enable_pin, HIGH);   
<a name="l00207"></a>00207    <a class="code" href="_l_c_d_8h.html#a6eac41e4be58d7736ac0c19de225c0dc">waitUsec</a>(1);          <span class="comment">// enable pulse must be &gt; 450ns   </span>
<a name="l00208"></a>00208    digitalWrite(_enable_pin, LOW);
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210 
<a name="l00211"></a>00211 <span class="comment">//</span>
<a name="l00212"></a>00212 <span class="comment">// write4bits</span>
<a name="l00213"></a>00213 <span class="keywordtype">void</span> LiquidCrystal::writeNbits(uint8_t value, uint8_t numBits) 
<a name="l00214"></a>00214 {
<a name="l00215"></a>00215    <span class="keywordflow">for</span> (uint8_t i = 0; i &lt; numBits; i++) 
<a name="l00216"></a>00216    {
<a name="l00217"></a>00217       digitalWrite(_data_pins[i], (value &gt;&gt; i) &amp; 0x01);
<a name="l00218"></a>00218    }
<a name="l00219"></a>00219    pulseEnable();
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221 
<a name="l00222"></a>00222 
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