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   <div id="projectname">LCD Library&#160;<span id="projectnumber">1.2.1</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_SR3W.cpp</div>  </div>
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<a href="_liquid_crystal___s_r3_w_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 7.3.2012.</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_SRG.h</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 but using a generic SHIFT REGISTER extension board.</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 a 3 wire latching</span>
<a name="l00021"></a>00021 <span class="comment">// shift register. While it has been tested with a 74HC595N shift register</span>
<a name="l00022"></a>00022 <span class="comment">// it should also work with other latching shift registers such as the MC14094</span>
<a name="l00023"></a>00023 <span class="comment">// and the HEF4094</span>
<a name="l00024"></a>00024 <span class="comment">//</span>
<a name="l00025"></a>00025 <span class="comment">// This particular driver has been created as generic as possible to enable</span>
<a name="l00026"></a>00026 <span class="comment">// users to configure and connect their LCDs using just 3 digital IOs from the</span>
<a name="l00027"></a>00027 <span class="comment">// AVR or Arduino, and connect the LCD to the outputs of the shiftregister</span>
<a name="l00028"></a>00028 <span class="comment">// in any configuration. The library is configured by passing the IO pins</span>
<a name="l00029"></a>00029 <span class="comment">// that control the strobe, data and clock of the shift register and a map</span>
<a name="l00030"></a>00030 <span class="comment">// of how the shiftregister is connected to the LCD.</span>
<a name="l00031"></a>00031 <span class="comment">// </span>
<a name="l00032"></a>00032 <span class="comment">//</span>
<a name="l00033"></a>00033 <span class="comment">//   +--------------------------------------------+</span>
<a name="l00034"></a>00034 <span class="comment">//   |                 MCU                        |</span>
<a name="l00035"></a>00035 <span class="comment">//   |   IO1           IO2           IO3          |</span>
<a name="l00036"></a>00036 <span class="comment">//   +----+-------------+-------------+-----------+</span>
<a name="l00037"></a>00037 <span class="comment">//        |             |             |</span>
<a name="l00038"></a>00038 <span class="comment">//        |             |             |</span>
<a name="l00039"></a>00039 <span class="comment">//   +----+-------------+-------------+-----------+</span>
<a name="l00040"></a>00040 <span class="comment">//   |    Strobe        Data          Clock       |</span>
<a name="l00041"></a>00041 <span class="comment">//   |          8-bit shift/latch register        | 74HC595N</span>
<a name="l00042"></a>00042 <span class="comment">//   |    Qa0  Qb1  Qc2  Qd3  Qe4  Qf5  Qg6  Qh7  |</span>
<a name="l00043"></a>00043 <span class="comment">//   +----+----+----+----+----+----+----+----+----+</span>
<a name="l00044"></a>00044 <span class="comment">//        |    |    |    |    |    |    |    </span>
<a name="l00045"></a>00045 <span class="comment">//        |11  |12  |13  |14  |6   |5   |4   (LCD pins)</span>
<a name="l00046"></a>00046 <span class="comment">//   +----+----+----+----+----+----+----+----+----+</span>
<a name="l00047"></a>00047 <span class="comment">//   |    DB4  DB5  DB6  DB7  E    Rw   RS        |</span>
<a name="l00048"></a>00048 <span class="comment">//   |                 LCD Module                 |</span>
<a name="l00049"></a>00049 <span class="comment">//</span>
<a name="l00050"></a>00050 <span class="comment">// NOTE: Rw is not used by the driver so it can be connected to GND.</span>
<a name="l00051"></a>00051 <span class="comment">//</span>
<a name="l00052"></a>00052 <span class="comment">// The functionality provided by this class and its base class is identical</span>
<a name="l00053"></a>00053 <span class="comment">// to the original functionality of the Arduino LiquidCrystal library.</span>
<a name="l00054"></a>00054 <span class="comment">//</span>
<a name="l00055"></a>00055 <span class="comment">//</span>
<a name="l00056"></a>00056 <span class="comment">// History</span>
<a name="l00057"></a>00057 <span class="comment">// 2012.03.29 bperrybap - fixed constructors not properly using Rs</span>
<a name="l00058"></a>00058 <span class="comment">//                        Fixed incorrect use of 5x10 for default font </span>
<a name="l00059"></a>00059 <span class="comment">//                        - now matches original LQ library.</span>
<a name="l00060"></a>00060 <span class="comment">//                        moved delay to send() so it is per cmd/write vs shiftout()</span>
<a name="l00061"></a>00061 <span class="comment">//                        NOTE: delay is on hairy edge of working when FAST_MODE is on.</span>
<a name="l00062"></a>00062 <span class="comment">//                        because of waitUsec().</span>
<a name="l00063"></a>00063 <span class="comment">//                        There is margin at 16Mhz AVR but might fail on 20Mhz AVRs.</span>
<a name="l00064"></a>00064 <span class="comment">//                        </span>
<a name="l00065"></a>00065 <span class="comment">// @author F. Malpartida - fmalpartida@gmail.com</span>
<a name="l00066"></a>00066 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00067"></a>00067 <span class="comment">// flags for backlight control</span>
<a name="l00068"></a>00068 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00069"></a>00069 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00070"></a>00070 <span class="preprocessor">#include &lt;inttypes.h&gt;</span>
<a name="l00071"></a>00071 
<a name="l00072"></a>00072 <span class="preprocessor">#if (ARDUINO &lt;  100)</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor">#include &lt;WProgram.h&gt;</span>
<a name="l00074"></a>00074 <span class="preprocessor">#else</span>
<a name="l00075"></a>00075 <span class="preprocessor"></span><span class="preprocessor">#include &lt;Arduino.h&gt;</span>
<a name="l00076"></a>00076 <span class="preprocessor">#endif</span>
<a name="l00077"></a>00077 <span class="preprocessor"></span><span class="preprocessor">#include &quot;<a class="code" href="_liquid_crystal___s_r3_w_8h.html">LiquidCrystal_SR3W.h</a>&quot;</span>
<a name="l00078"></a>00078 
<a name="l00079"></a>00079 <span class="preprocessor">#include &quot;<a class="code" href="_fast_i_o_8h.html">FastIO.h</a>&quot;</span>
<a name="l00080"></a>00080 
<a name="l00086"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">00086</a> <span class="preprocessor">#define LCD_NOBACKLIGHT 0x00</span>
<a name="l00087"></a>00087 <span class="preprocessor"></span>
<a name="l00093"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#ac059d24dfe9c1e1f7c07cb7869a1833b">00093</a> <span class="preprocessor">#define LCD_BACKLIGHT   0xFF</span>
<a name="l00094"></a>00094 <span class="preprocessor"></span>
<a name="l00095"></a>00095 
<a name="l00096"></a>00096 <span class="comment">// Default library configuration parameters used by class constructor with</span>
<a name="l00097"></a>00097 <span class="comment">// only the I2C address field.</span>
<a name="l00098"></a>00098 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00104"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a22e6626f2c98ed902f8ded47f6438c05">00104</a> <span class="comment"></span><span class="preprocessor">#define EN 4  // Enable bit</span>
<a name="l00105"></a>00105 <span class="preprocessor"></span>
<a name="l00111"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#afc4ded33ac0ca43defcce639e965748a">00111</a> <span class="preprocessor">#define RW 5  // Read/Write bit</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span>
<a name="l00118"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#af8903d8eea3868940c60af887473b152">00118</a> <span class="preprocessor">#define RS 6  // Register select bit</span>
<a name="l00119"></a>00119 <span class="preprocessor"></span>
<a name="l00126"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a3d9bb178282c3cb69740c94ba1e48fed">00126</a> <span class="preprocessor">#define D4 0</span>
<a name="l00127"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a2ddd4183d444d6d128cbdbd6269e4e0c">00127</a> <span class="preprocessor"></span><span class="preprocessor">#define D5 1</span>
<a name="l00128"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a79a18a7f5ccf7a7ca31f302bd62527a6">00128</a> <span class="preprocessor"></span><span class="preprocessor">#define D6 2</span>
<a name="l00129"></a><a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a2ba78f059a7ebebc95e7beef690e88d6">00129</a> <span class="preprocessor"></span><span class="preprocessor">#define D7 3</span>
<a name="l00130"></a>00130 <span class="preprocessor"></span>
<a name="l00131"></a>00131 
<a name="l00132"></a>00132 
<a name="l00133"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#ae1396bcd5e9c5b7ed13182c166de776b">00133</a> <a class="code" href="class_liquid_crystal___s_r3_w.html#ae1396bcd5e9c5b7ed13182c166de776b">LiquidCrystal_SR3W::LiquidCrystal_SR3W</a>(uint8_t data, uint8_t clk, uint8_t strobe)
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135    init( data, clk, strobe, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#af8903d8eea3868940c60af887473b152">RS</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#afc4ded33ac0ca43defcce639e965748a">RW</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a22e6626f2c98ed902f8ded47f6438c05">EN</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a3d9bb178282c3cb69740c94ba1e48fed">D4</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a2ddd4183d444d6d128cbdbd6269e4e0c">D5</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a79a18a7f5ccf7a7ca31f302bd62527a6">D6</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a2ba78f059a7ebebc95e7beef690e88d6">D7</a> );
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137 
<a name="l00138"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#a7b2f382b76bc9d88adb8d681e824b4de">00138</a> <a class="code" href="class_liquid_crystal___s_r3_w.html#ae1396bcd5e9c5b7ed13182c166de776b">LiquidCrystal_SR3W::LiquidCrystal_SR3W</a>(uint8_t data, uint8_t clk, uint8_t strobe,
<a name="l00139"></a>00139                                        uint8_t backlighPin, <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bc">t_backlighPol</a> pol)
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141    init( data, clk, strobe, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#af8903d8eea3868940c60af887473b152">RS</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#afc4ded33ac0ca43defcce639e965748a">RW</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a22e6626f2c98ed902f8ded47f6438c05">EN</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a3d9bb178282c3cb69740c94ba1e48fed">D4</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a2ddd4183d444d6d128cbdbd6269e4e0c">D5</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a79a18a7f5ccf7a7ca31f302bd62527a6">D6</a>, <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a2ba78f059a7ebebc95e7beef690e88d6">D7</a> );
<a name="l00142"></a>00142    <a class="code" href="class_liquid_crystal___s_r3_w.html#a894d0ea8ea61c1d15acd8a26d417e477">setBacklightPin</a>(backlighPin, pol);
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 
<a name="l00145"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#a4fab8ff2f21bba3efd133cd8c87fffc0">00145</a> <a class="code" href="class_liquid_crystal___s_r3_w.html#ae1396bcd5e9c5b7ed13182c166de776b">LiquidCrystal_SR3W::LiquidCrystal_SR3W</a>(uint8_t data, uint8_t clk, uint8_t strobe,
<a name="l00146"></a>00146                                        uint8_t En, uint8_t Rw, uint8_t Rs, 
<a name="l00147"></a>00147                                        uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7 )
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149    init( data, clk, strobe, Rs, Rw, En, d4, d5, d6, d7 );
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 
<a name="l00152"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#a24f051747dfeda48f7b207c3358c8015">00152</a> <a class="code" href="class_liquid_crystal___s_r3_w.html#ae1396bcd5e9c5b7ed13182c166de776b">LiquidCrystal_SR3W::LiquidCrystal_SR3W</a>(uint8_t data, uint8_t clk, uint8_t strobe, 
<a name="l00153"></a>00153                                        uint8_t En, uint8_t Rw, uint8_t Rs, 
<a name="l00154"></a>00154                                        uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7,
<a name="l00155"></a>00155                                        uint8_t backlighPin, <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bc">t_backlighPol</a> pol)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157    init( data, clk, strobe, Rs, Rw, En, d4, d5, d6, d7 );
<a name="l00158"></a>00158    <a class="code" href="class_liquid_crystal___s_r3_w.html#a894d0ea8ea61c1d15acd8a26d417e477">setBacklightPin</a>(backlighPin, pol);
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 
<a name="l00161"></a>00161 
<a name="l00162"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#ade34af5b7fe795482f1848c2176d6e56">00162</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal___s_r3_w.html#ade34af5b7fe795482f1848c2176d6e56">LiquidCrystal_SR3W::send</a>(uint8_t value, uint8_t mode)
<a name="l00163"></a>00163 {
<a name="l00164"></a>00164    
<a name="l00165"></a>00165    <span class="keywordflow">if</span> ( mode != <a class="code" href="_l_c_d_8h.html#aa1e30e32b6c2cf8d90a9281328472dbe">FOUR_BITS</a> )
<a name="l00166"></a>00166    {
<a name="l00167"></a>00167       write4bits( (value &gt;&gt; 4), mode ); <span class="comment">// upper nibble</span>
<a name="l00168"></a>00168    }   
<a name="l00169"></a>00169    write4bits( (value &amp; 0x0F), mode); <span class="comment">// lower nibble</span>
<a name="l00170"></a>00170 
<a name="l00171"></a>00171 
<a name="l00172"></a>00172 <span class="preprocessor">#if (F_CPU &lt;= 16000000)</span>
<a name="l00173"></a>00173 <span class="preprocessor"></span>   <span class="comment">// No need to use the delay routines on AVR since the time taken to write</span>
<a name="l00174"></a>00174    <span class="comment">// on AVR with SR pin mapping even with fio is longer than LCD command execution.</span>
<a name="l00175"></a>00175    <a class="code" href="_l_c_d_8h.html#a6eac41e4be58d7736ac0c19de225c0dc">waitUsec</a>(37); <span class="comment">//goes away on AVRs</span>
<a name="l00176"></a>00176 <span class="preprocessor">#else</span>
<a name="l00177"></a>00177 <span class="preprocessor"></span>   delayMicroseconds ( 37 );      <span class="comment">// commands &amp; data writes need &gt; 37us to complete</span>
<a name="l00178"></a>00178 <span class="preprocessor">#endif</span>
<a name="l00179"></a>00179 <span class="preprocessor"></span>
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181 
<a name="l00182"></a>00182 
<a name="l00183"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#a894d0ea8ea61c1d15acd8a26d417e477">00183</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal___s_r3_w.html#a894d0ea8ea61c1d15acd8a26d417e477">LiquidCrystal_SR3W::setBacklightPin</a> ( uint8_t value, <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bc">t_backlighPol</a> pol = <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bca03d440bbbfb042afc85347f994b44fb5">POSITIVE</a> )
<a name="l00184"></a>00184 {
<a name="l00185"></a>00185    _backlightPinMask = ( 1 &lt;&lt; value );
<a name="l00186"></a>00186    _backlightStsMask = <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">LCD_NOBACKLIGHT</a>;
<a name="l00187"></a>00187    <a class="code" href="class_l_c_d.html#a990338759d2abe10b0fb1743b7789566">_polarity</a> = pol;
<a name="l00188"></a>00188    <a class="code" href="class_liquid_crystal___s_r3_w.html#a6d0fc7907ef9fd87c408a21b9bd49295">setBacklight</a> (<a class="code" href="_l_c_d_8h.html#a0f50ae3b4bdb42dd5ad74b2c604a7515">BACKLIGHT_OFF</a>);     <span class="comment">// Set backlight to off as initial setup</span>
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 
<a name="l00191"></a><a class="code" href="class_liquid_crystal___s_r3_w.html#a6d0fc7907ef9fd87c408a21b9bd49295">00191</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal___s_r3_w.html#a6d0fc7907ef9fd87c408a21b9bd49295">LiquidCrystal_SR3W::setBacklight</a> ( uint8_t value )
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193    <span class="comment">// Check if backlight is available</span>
<a name="l00194"></a>00194    <span class="comment">// ----------------------------------------------------</span>
<a name="l00195"></a>00195    <span class="keywordflow">if</span> ( _backlightPinMask != 0x0 )
<a name="l00196"></a>00196    {
<a name="l00197"></a>00197       <span class="comment">// Check for polarity to configure mask accordingly</span>
<a name="l00198"></a>00198       <span class="comment">// ----------------------------------------------------------</span>
<a name="l00199"></a>00199       <span class="keywordflow">if</span>  (((<a class="code" href="class_l_c_d.html#a990338759d2abe10b0fb1743b7789566">_polarity</a> == <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bca03d440bbbfb042afc85347f994b44fb5">POSITIVE</a>) &amp;&amp; (value &gt; 0)) || 
<a name="l00200"></a>00200            ((<a class="code" href="class_l_c_d.html#a990338759d2abe10b0fb1743b7789566">_polarity</a> == <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bca62d66a51fa7574c652597716f7709865">NEGATIVE</a> ) &amp;&amp; ( value == 0 )))
<a name="l00201"></a>00201       {
<a name="l00202"></a>00202          _backlightStsMask = _backlightPinMask &amp; <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#ac059d24dfe9c1e1f7c07cb7869a1833b">LCD_BACKLIGHT</a>;
<a name="l00203"></a>00203       }
<a name="l00204"></a>00204       <span class="keywordflow">else</span> 
<a name="l00205"></a>00205       {
<a name="l00206"></a>00206          _backlightStsMask = _backlightPinMask &amp; <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">LCD_NOBACKLIGHT</a>;
<a name="l00207"></a>00207       }
<a name="l00208"></a>00208       loadSR( _backlightStsMask );
<a name="l00209"></a>00209    }
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211 
<a name="l00212"></a>00212 
<a name="l00213"></a>00213 <span class="comment">// PRIVATE METHODS</span>
<a name="l00214"></a>00214 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00215"></a>00215 
<a name="l00216"></a>00216 <span class="keywordtype">int</span> LiquidCrystal_SR3W::init(uint8_t data, uint8_t clk, uint8_t strobe, 
<a name="l00217"></a>00217                              uint8_t Rs, uint8_t Rw, uint8_t En,
<a name="l00218"></a>00218                              uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
<a name="l00219"></a>00219 {
<a name="l00220"></a>00220    _data       = <a class="code" href="_fast_i_o_8cpp.html#a07a19dfbdca1afaca5d666bdaa3be7d5">fio_pinToBit</a>(data);
<a name="l00221"></a>00221    _clk        = <a class="code" href="_fast_i_o_8cpp.html#a07a19dfbdca1afaca5d666bdaa3be7d5">fio_pinToBit</a>(clk);
<a name="l00222"></a>00222    _strobe     = <a class="code" href="_fast_i_o_8cpp.html#a07a19dfbdca1afaca5d666bdaa3be7d5">fio_pinToBit</a>(strobe);
<a name="l00223"></a>00223    _data_reg   = <a class="code" href="_fast_i_o_8cpp.html#a04210cc785c3b4a11c86f794949c327f">fio_pinToOutputRegister</a>(data);
<a name="l00224"></a>00224    _clk_reg    = <a class="code" href="_fast_i_o_8cpp.html#a04210cc785c3b4a11c86f794949c327f">fio_pinToOutputRegister</a>(clk);
<a name="l00225"></a>00225    _strobe_reg = <a class="code" href="_fast_i_o_8cpp.html#a04210cc785c3b4a11c86f794949c327f">fio_pinToOutputRegister</a>(strobe);
<a name="l00226"></a>00226    
<a name="l00227"></a>00227    <span class="comment">// LCD pin mapping</span>
<a name="l00228"></a>00228    _backlightPinMask = 0;
<a name="l00229"></a>00229    _backlightStsMask = <a class="code" href="_liquid_crystal___s_r3_w_8cpp.html#a65fa786d6e31fe8b1aa51784a9736581">LCD_NOBACKLIGHT</a>;
<a name="l00230"></a>00230    <a class="code" href="class_l_c_d.html#a990338759d2abe10b0fb1743b7789566">_polarity</a> = <a class="code" href="_l_c_d_8h.html#aeeef728bf4726268aa5e99391a1502bca03d440bbbfb042afc85347f994b44fb5">POSITIVE</a>;
<a name="l00231"></a>00231    
<a name="l00232"></a>00232    _En = ( 1 &lt;&lt; En );
<a name="l00233"></a>00233    _Rw = ( 1 &lt;&lt; Rw );
<a name="l00234"></a>00234    _Rs = ( 1 &lt;&lt; Rs );
<a name="l00235"></a>00235    
<a name="l00236"></a>00236    <span class="comment">// Initialise pin mapping</span>
<a name="l00237"></a>00237    _data_pins[0] = ( 1 &lt;&lt; d4 );
<a name="l00238"></a>00238    _data_pins[1] = ( 1 &lt;&lt; d5 );
<a name="l00239"></a>00239    _data_pins[2] = ( 1 &lt;&lt; d6 );
<a name="l00240"></a>00240    _data_pins[3] = ( 1 &lt;&lt; d7 );
<a name="l00241"></a>00241    
<a name="l00242"></a>00242    <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="l00243"></a>00243    
<a name="l00244"></a>00244    <span class="keywordflow">return</span> (1);
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246 
<a name="l00247"></a>00247 <span class="keywordtype">void</span> LiquidCrystal_SR3W::write4bits(uint8_t value, uint8_t mode)
<a name="l00248"></a>00248 {
<a name="l00249"></a>00249    uint8_t pinMapValue = 0;
<a name="l00250"></a>00250    
<a name="l00251"></a>00251    <span class="comment">// Map the value to LCD pin mapping</span>
<a name="l00252"></a>00252    <span class="comment">// --------------------------------</span>
<a name="l00253"></a>00253    <span class="keywordflow">for</span> ( uint8_t i = 0; i &lt; 4; i++ )
<a name="l00254"></a>00254    {
<a name="l00255"></a>00255       <span class="keywordflow">if</span> ( ( value &amp; 0x1 ) == 1 )
<a name="l00256"></a>00256       {
<a name="l00257"></a>00257          pinMapValue |= _data_pins[i];
<a name="l00258"></a>00258       }
<a name="l00259"></a>00259       value = ( value &gt;&gt; 1 );
<a name="l00260"></a>00260    }
<a name="l00261"></a>00261    
<a name="l00262"></a>00262    <span class="comment">// Is it a command or data</span>
<a name="l00263"></a>00263    <span class="comment">// -----------------------</span>
<a name="l00264"></a>00264    mode = ( mode == <a class="code" href="_l_c_d_8h.html#aad9ae913bdfab20dd94ad04ee2d5b045">DATA</a> ) ? _Rs : 0;
<a name="l00265"></a>00265    
<a name="l00266"></a>00266    pinMapValue |= mode | _backlightStsMask;
<a name="l00267"></a>00267    loadSR ( pinMapValue | _En );  <span class="comment">// Send with enable high</span>
<a name="l00268"></a>00268    loadSR ( pinMapValue); <span class="comment">// Send with enable low</span>
<a name="l00269"></a>00269 }
<a name="l00270"></a>00270 
<a name="l00271"></a>00271 
<a name="l00272"></a>00272 <span class="keywordtype">void</span> LiquidCrystal_SR3W::loadSR(uint8_t value) 
<a name="l00273"></a>00273 {
<a name="l00274"></a>00274    <span class="comment">// Load the shift register with information</span>
<a name="l00275"></a>00275    <a class="code" href="_fast_i_o_8cpp.html#a56c72b9f00680662229895ab22aaa743">fio_shiftOut</a>(_data_reg, _data, _clk_reg, _clk, value, MSBFIRST);
<a name="l00276"></a>00276    
<a name="l00277"></a>00277    <span class="comment">// Strobe the data into the latch</span>
<a name="l00278"></a>00278    <a class="code" href="_fast_i_o_8h.html#a04971fe5fabe4129736708c494e08e6d">ATOMIC_BLOCK</a>(<a class="code" href="_fast_i_o_8h.html#a362c18b15a09703e42e1c246c47420ef">ATOMIC_RESTORESTATE</a>)
<a name="l00279"></a>00279    {
<a name="l00280"></a>00280       <a class="code" href="_fast_i_o_8h.html#a89e1c62276052100c62b6c82a2e95622">fio_digitalWrite_HIGH</a>(_strobe_reg, _strobe);
<a name="l00281"></a>00281       <a class="code" href="_fast_i_o_8h.html#accae9687fdfc5f3492fb6344d62eb190">fio_digitalWrite_SWITCHTO</a>(_strobe_reg, _strobe, LOW);
<a name="l00282"></a>00282    }
<a name="l00283"></a>00283 }
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