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   <div id="projectname">LCD Library&#160;<span id="projectnumber">1.1.7</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_SR.cpp</div>  </div>
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<a href="_liquid_crystal___s_r_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_SR.h</span>
<a name="l00013"></a>00013 <span class="comment">//  Connects an LCD using 2 or 3 pins from the Arduino, via an 8-bit </span>
<a name="l00014"></a>00014 <span class="comment">// ShiftRegister (SR from now on).</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 port of the ShiftRegLCD library from raron and ported to the</span>
<a name="l00018"></a>00018 <span class="comment">// LCD library.</span>
<a name="l00019"></a>00019 <span class="comment">//</span>
<a name="l00020"></a>00020 <span class="comment">// The functionality provided by this class and its base class is identical</span>
<a name="l00021"></a>00021 <span class="comment">// to the original functionality of the Arduino LiquidCrystal library and can</span>
<a name="l00022"></a>00022 <span class="comment">// be used as such.</span>
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024 <span class="comment">// Modified to work serially with the shiftOut() function, an 8-bit</span>
<a name="l00025"></a>00025 <span class="comment">// unlatched, no-tristate, unidirectional SIPO (Serial-In-Parallel-Out)</span>
<a name="l00026"></a>00026 <span class="comment">// shift register (IE a very simple SR), and an LCD in 4-bit mode.</span>
<a name="l00027"></a>00027 <span class="comment">// Any such shift register should do (pref. 74LS family IC&#39;s for 2-wire).</span>
<a name="l00028"></a>00028 <span class="comment">// I used 74LS164, for the reason that&#39;s what I had at hand.</span>
<a name="l00029"></a>00029 <span class="comment">//</span>
<a name="l00030"></a>00030 <span class="comment">// Connection description:</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00032"></a>00032 <span class="comment">// SR output:</span>
<a name="l00033"></a>00033 <span class="comment">// Bit  #0   - N/C - not connected, used to hold a zero</span>
<a name="l00034"></a>00034 <span class="comment">// Bit  #1   - N/C</span>
<a name="l00035"></a>00035 <span class="comment">// Bit  #2   - connects to RS (Register Select) on the LCD</span>
<a name="l00036"></a>00036 <span class="comment">// Bits #3-6 - connects to LCD data inputs D4 - D7.</span>
<a name="l00037"></a>00037 <span class="comment">// Bit  #7   - enables the LCD enable-puls (via the diode-resistor AND &quot;gate&quot;)</span>
<a name="l00038"></a>00038 <span class="comment">//</span>
<a name="l00039"></a>00039 <span class="comment">// 2 or 3 Pins required from the Arduino for Data, Clock and (optional) Enable</span>
<a name="l00040"></a>00040 <span class="comment">// If not using Enable, the Data pin is used for the enable signal by defining</span>
<a name="l00041"></a>00041 <span class="comment">// the same pin for Enable as for Data. Data and Clock outputs/pins goes to</span>
<a name="l00042"></a>00042 <span class="comment">// the shiftregister.</span>
<a name="l00043"></a>00043 <span class="comment">// LCD RW-pin hardwired to LOW (only writing to LCD).</span>
<a name="l00044"></a>00044 <span class="comment">// Busy Flag (BF, data bit D7) is not read.</span>
<a name="l00045"></a>00045 <span class="comment">//</span>
<a name="l00046"></a>00046 <span class="comment">//  Original project homepage: http://code.google.com/p/arduinoshiftreglcd/</span>
<a name="l00047"></a>00047 <span class="comment">//</span>
<a name="l00048"></a>00048 <span class="comment">//</span>
<a name="l00049"></a>00049 <span class="comment">// History</span>
<a name="l00050"></a>00050 <span class="comment">// 2011.10.29  fmalpartida - adaption of the library to the LCD class hierarchy.</span>
<a name="l00051"></a>00051 <span class="comment">// 2011.07.02  Fixed a minor flaw in setCursor function. No functional change, </span>
<a name="l00052"></a>00052 <span class="comment">//             just a bit more memory efficient.</span>
<a name="l00053"></a>00053 <span class="comment">//             Thanks to CapnBry (from google code and github) who noticed it.</span>
<a name="l00054"></a>00054 <span class="comment">//             URL to his version of shiftregLCD:</span>
<a name="l00055"></a>00055 <span class="comment">//             https://github.com/CapnBry/HeaterMeter/commit/c6beba1b46b092ab0b33bcbd0a30a201fd1f28c1</span>
<a name="l00056"></a>00056 <span class="comment">// 2009.07.30  raron - minor corrections to the comments.</span>
<a name="l00057"></a>00057 <span class="comment">//             Fixed timing to datasheet safe. Fixed keyword highlights.</span>
<a name="l00058"></a>00058 <span class="comment">// 2009.07.28  Mircho / raron - a new modification to the schematics, and a</span>
<a name="l00059"></a>00059 <span class="comment">//             more streamlined interface</span>
<a name="l00060"></a>00060 <span class="comment">// 2009.07.27  Thanks to an excellent suggestion from mircho at the Arduiono </span>
<a name="l00061"></a>00061 <span class="comment">//             playgrond forum, the number of wires now required is only two!</span>
<a name="l00062"></a>00062 <span class="comment">// 2009.07.25  raron - Fixed comments. I really messed up the comments before </span>
<a name="l00063"></a>00063 <span class="comment">//             posting this, so I had to fix it.</span>
<a name="l00064"></a>00064 <span class="comment">//             Renamed a function, but no improvements or functional changes.</span>
<a name="l00065"></a>00065 <span class="comment">// 2009.07.23  Incorporated some proper initialization routines</span>
<a name="l00066"></a>00066 <span class="comment">//             inspired (lets say copy-paste-tweaked) from LiquidCrystal</span>
<a name="l00067"></a>00067 <span class="comment">//             library improvements from LadyAda.</span>
<a name="l00068"></a>00068 <span class="comment">// 2009.05.23  raron - first version, but based mostly (as in almost verbatim)</span>
<a name="l00069"></a>00069 <span class="comment">//             on the &quot;official&quot; LiquidCrystal library.</span>
<a name="l00070"></a>00070 <span class="comment">//</span>
<a name="l00071"></a>00071 <span class="comment">//</span>
<a name="l00072"></a>00072 <span class="comment">// This library is only compatible with Arduino&#39;s SDK version 1.0</span>
<a name="l00073"></a>00073 <span class="comment">//</span>
<a name="l00074"></a>00074 <span class="comment">//</span>
<a name="l00075"></a>00075 <span class="comment">// @author F. Malpartida - fmalpartida@gmail.com</span>
<a name="l00076"></a>00076 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00077"></a>00077 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00078"></a>00078 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00079"></a>00079 <span class="preprocessor">#include &lt;inttypes.h&gt;</span>
<a name="l00080"></a>00080 
<a name="l00081"></a>00081 <span class="preprocessor">#if (ARDUINO &lt;  100)</span>
<a name="l00082"></a>00082 <span class="preprocessor"></span><span class="preprocessor">#include &lt;WProgram.h&gt;</span>
<a name="l00083"></a>00083 <span class="preprocessor">#else</span>
<a name="l00084"></a>00084 <span class="preprocessor"></span><span class="preprocessor">#include &lt;Arduino.h&gt;</span>
<a name="l00085"></a>00085 <span class="preprocessor">#endif</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor">#include &lt;<a class="code" href="_liquid_crystal___s_r_8h.html">LiquidCrystal_SR.h</a>&gt;</span>
<a name="l00087"></a>00087 
<a name="l00088"></a>00088 <span class="comment">// When the display powers up, it is configured as follows:</span>
<a name="l00089"></a>00089 <span class="comment">//</span>
<a name="l00090"></a>00090 <span class="comment">// 1. Display clear</span>
<a name="l00091"></a>00091 <span class="comment">// 2. Function set: </span>
<a name="l00092"></a>00092 <span class="comment">//    DL = 1; 8-bit interface data </span>
<a name="l00093"></a>00093 <span class="comment">//    N = 0; 1-line display </span>
<a name="l00094"></a>00094 <span class="comment">//    F = 0; 5x8 dot character font </span>
<a name="l00095"></a>00095 <span class="comment">// 3. Display on/off control: </span>
<a name="l00096"></a>00096 <span class="comment">//    D = 0; Display off </span>
<a name="l00097"></a>00097 <span class="comment">//    C = 0; Cursor off </span>
<a name="l00098"></a>00098 <span class="comment">//    B = 0; Blinking off </span>
<a name="l00099"></a>00099 <span class="comment">// 4. Entry mode set: </span>
<a name="l00100"></a>00100 <span class="comment">//    I/D = 1; Increment by 1 </span>
<a name="l00101"></a>00101 <span class="comment">//    S = 0; No shift </span>
<a name="l00102"></a>00102 <span class="comment">//</span>
<a name="l00103"></a>00103 <span class="comment">// Note, however, that resetting the Arduino doesn&#39;t reset the LCD, so we</span>
<a name="l00104"></a>00104 <span class="comment">// can&#39;t assume that its in that state when a sketch starts (and the</span>
<a name="l00105"></a>00105 <span class="comment">// LiquidCrystal constructor is called).</span>
<a name="l00106"></a>00106 <span class="comment">// A call to begin() will reinitialize the LCD.</span>
<a name="l00107"></a>00107 
<a name="l00108"></a>00108 <span class="comment">// STATIC helper functions</span>
<a name="l00109"></a>00109 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00110"></a>00110 
<a name="l00111"></a>00111 
<a name="l00112"></a>00112 <span class="comment">// CONSTRUCTORS</span>
<a name="l00113"></a>00113 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00114"></a>00114 <span class="comment">// Assuming 1 line 8 pixel high font</span>
<a name="l00115"></a><a class="code" href="class_liquid_crystal___s_r.html#a40bca9b97ad5c1e938c7dee1fd0850f2">00115</a> <a class="code" href="class_liquid_crystal___s_r.html#a40bca9b97ad5c1e938c7dee1fd0850f2">LiquidCrystal_SR::LiquidCrystal_SR</a> ( uint8_t srdata, uint8_t srclock, 
<a name="l00116"></a>00116                                      uint8_t enable ) 
<a name="l00117"></a>00117 {
<a name="l00118"></a>00118         init ( srdata, srclock, enable, 1, 0 );
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120 
<a name="l00121"></a>00121 
<a name="l00122"></a>00122 
<a name="l00123"></a>00123 <span class="comment">// PRIVATE METHODS</span>
<a name="l00124"></a>00124 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00125"></a>00125 
<a name="l00126"></a>00126 <span class="comment">//</span>
<a name="l00127"></a>00127 <span class="comment">// init</span>
<a name="l00128"></a>00128 <span class="keywordtype">void</span> LiquidCrystal_SR::init( uint8_t srdata, uint8_t srclock, uint8_t enable, 
<a name="l00129"></a>00129                              uint8_t lines, uint8_t font )
<a name="l00130"></a>00130 {
<a name="l00131"></a>00131    <span class="comment">// Initialise private variables</span>
<a name="l00132"></a>00132    _two_wire    = 0;
<a name="l00133"></a>00133    _srdata_pin  = srdata; 
<a name="l00134"></a>00134    _srclock_pin = srclock; 
<a name="l00135"></a>00135    _enable_pin  = enable;
<a name="l00136"></a>00136    
<a name="l00137"></a>00137    <span class="keywordflow">if</span> (enable == <a class="code" href="_liquid_crystal___s_r_8h.html#a40fb1f76bc5f8ca9e6534b47bd6da27c">TWO_WIRE</a>)
<a name="l00138"></a>00138    {
<a name="l00139"></a>00139       _enable_pin = _srdata_pin;
<a name="l00140"></a>00140       _two_wire   = 1;
<a name="l00141"></a>00141    }
<a name="l00142"></a>00142    
<a name="l00143"></a>00143    <span class="comment">// Configure control pins as outputs</span>
<a name="l00144"></a>00144    <span class="comment">// ------------------------------------------------------------------------</span>
<a name="l00145"></a>00145    pinMode(_srclock_pin, OUTPUT);
<a name="l00146"></a>00146    pinMode(_srdata_pin, OUTPUT);
<a name="l00147"></a>00147    pinMode(_enable_pin, OUTPUT);
<a name="l00148"></a>00148    
<a name="l00149"></a>00149    <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#abb3210156d88d3fe18c9352eb161fe42">LCD_5x10DOTS</a>;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151 
<a name="l00152"></a>00152 <span class="comment">// PUBLIC METHODS</span>
<a name="l00153"></a>00153 <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00154"></a>00154 
<a name="l00155"></a>00155 <span class="comment">//</span>
<a name="l00156"></a>00156 <span class="comment">// begin</span>
<a name="l00157"></a><a class="code" href="class_liquid_crystal___s_r.html#a6fa1502e910d7e70f7a598d26963a001">00157</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal___s_r.html#a6fa1502e910d7e70f7a598d26963a001">LiquidCrystal_SR::begin</a>(uint8_t cols, uint8_t lines, uint8_t dotsize) 
<a name="l00158"></a>00158 {
<a name="l00159"></a>00159    
<a name="l00160"></a>00160    <span class="keywordflow">if</span> (lines &gt; 1) 
<a name="l00161"></a>00161    {
<a name="l00162"></a>00162       <a class="code" href="class_l_c_d.html#aef093ba3f8e1016267b40ac235a0fa0f">_displayfunction</a> |= <a class="code" href="_l_c_d_8h.html#a7987e93538df2819583ba43b81ddbb25">LCD_2LINE</a>;
<a name="l00163"></a>00163    }
<a name="l00164"></a>00164 
<a name="l00165"></a>00165    <a class="code" href="class_l_c_d.html#ac1374911fb145fea430c21092ada0c06">_numlines</a> = lines;
<a name="l00166"></a>00166    <a class="code" href="class_l_c_d.html#a88b16ea0e5c7d1cabc5007d48bcbd2b0">_cols</a> = cols;
<a name="l00167"></a>00167    
<a name="l00168"></a>00168    <span class="comment">// for some 1 line displays you can select a 10 pixel high font</span>
<a name="l00169"></a>00169    <span class="comment">// ------------------------------------------------------------</span>
<a name="l00170"></a>00170    <span class="keywordflow">if</span> ((dotsize != 0) &amp;&amp; (lines == 1)) 
<a name="l00171"></a>00171    {
<a name="l00172"></a>00172       <a class="code" href="class_l_c_d.html#aef093ba3f8e1016267b40ac235a0fa0f">_displayfunction</a> |= <a class="code" href="_l_c_d_8h.html#abb3210156d88d3fe18c9352eb161fe42">LCD_5x10DOTS</a>;
<a name="l00173"></a>00173    }
<a name="l00174"></a>00174    
<a name="l00175"></a>00175    <span class="comment">// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!</span>
<a name="l00176"></a>00176    <span class="comment">// according to datasheet, we need at least 40ms after power rises above 2.7V</span>
<a name="l00177"></a>00177    <span class="comment">// before sending commands. Arduino can turn on way before 4.5V so we&#39;ll wait </span>
<a name="l00178"></a>00178    <span class="comment">// 50</span>
<a name="l00179"></a>00179    <span class="comment">// ---------------------------------------------------------------------------</span>
<a name="l00180"></a>00180    delayMicroseconds(50000);
<a name="l00181"></a>00181    write4bits(<a class="code" href="_l_c_d_8h.html#aaef882ae70d1f485cd132815d9716111">LCD_FUNCTIONSET</a> | <a class="code" href="_l_c_d_8h.html#a59a57ca857dae5d89eb5f2a38c4ac6f0">LCD_8BITMODE</a>);
<a name="l00182"></a>00182    delayMicroseconds(4500);  <span class="comment">// wait more than 4.1ms</span>
<a name="l00183"></a>00183    
<a name="l00184"></a>00184    <span class="comment">// Second try</span>
<a name="l00185"></a>00185    write4bits(<a class="code" href="_l_c_d_8h.html#aaef882ae70d1f485cd132815d9716111">LCD_FUNCTIONSET</a> | <a class="code" href="_l_c_d_8h.html#a59a57ca857dae5d89eb5f2a38c4ac6f0">LCD_8BITMODE</a>);
<a name="l00186"></a>00186    delayMicroseconds(150);
<a name="l00187"></a>00187    <span class="comment">// Third go</span>
<a name="l00188"></a>00188    write4bits(<a class="code" href="_l_c_d_8h.html#aaef882ae70d1f485cd132815d9716111">LCD_FUNCTIONSET</a> | <a class="code" href="_l_c_d_8h.html#a59a57ca857dae5d89eb5f2a38c4ac6f0">LCD_8BITMODE</a>);
<a name="l00189"></a>00189    
<a name="l00190"></a>00190    <span class="comment">// And finally, set to 4-bit interface</span>
<a name="l00191"></a>00191    write4bits(<a class="code" href="_l_c_d_8h.html#aaef882ae70d1f485cd132815d9716111">LCD_FUNCTIONSET</a> | <a class="code" href="_l_c_d_8h.html#ab8c35d355d2372090c7a347e961c9224">LCD_4BITMODE</a>);
<a name="l00192"></a>00192    
<a name="l00193"></a>00193    <span class="comment">// Set # lines, font size, etc.</span>
<a name="l00194"></a>00194    <a class="code" href="class_l_c_d.html#a31a0cb42497d83cdc9cb8000828f7190">command</a>(<a class="code" href="_l_c_d_8h.html#aaef882ae70d1f485cd132815d9716111">LCD_FUNCTIONSET</a> | <a class="code" href="class_l_c_d.html#aef093ba3f8e1016267b40ac235a0fa0f">_displayfunction</a>);
<a name="l00195"></a>00195    <span class="comment">// Turn the display on with no cursor or blinking default</span>
<a name="l00196"></a>00196    <a class="code" href="class_l_c_d.html#ae47a0e2eff74431a39774b788d5761f4">_displaycontrol</a> = <a class="code" href="_l_c_d_8h.html#a76236ae8317b34bbc98ea56bc0a2639c">LCD_DISPLAYON</a> | <a class="code" href="_l_c_d_8h.html#a32b194a3adaa0a0bb69acee2e6a754fa">LCD_CURSOROFF</a> | <a class="code" href="_l_c_d_8h.html#a4b28243034cec656b0ed490ba6979752">LCD_BLINKOFF</a>;
<a name="l00197"></a>00197    <a class="code" href="class_l_c_d.html#a5b07cf05e8e5e7c53654f5ca0cf58b89">display</a>();
<a name="l00198"></a>00198    <span class="comment">// Clear it off</span>
<a name="l00199"></a>00199    <a class="code" href="class_l_c_d.html#afa699e0beeeee03cce8cef87eba81c4a">clear</a>();
<a name="l00200"></a>00200    <span class="comment">// Initialize to default text direction (for romance languages)</span>
<a name="l00201"></a>00201    <a class="code" href="class_l_c_d.html#a726b9a68d091dd8683a18e83f3a8fd3c">_displaymode</a> = <a class="code" href="_l_c_d_8h.html#ae7c6309fce6200bd7526d090a4a84dd0">LCD_ENTRYLEFT</a> | <a class="code" href="_l_c_d_8h.html#a049ee97e98d04788c1da9a55590fbe42">LCD_ENTRYSHIFTDECREMENT</a>;
<a name="l00202"></a>00202    <span class="comment">// set the entry mode</span>
<a name="l00203"></a>00203    <a class="code" href="class_l_c_d.html#a31a0cb42497d83cdc9cb8000828f7190">command</a>(<a class="code" href="_l_c_d_8h.html#a5597e1d5819ea2f0734ad4313abf6703">LCD_ENTRYMODESET</a> | <a class="code" href="class_l_c_d.html#a726b9a68d091dd8683a18e83f3a8fd3c">_displaymode</a>);
<a name="l00204"></a>00204    <a class="code" href="class_l_c_d.html#aee45ad37f09312f5d9982257e2d37e68">home</a>();
<a name="l00205"></a>00205    
<a name="l00206"></a>00206 }
<a name="l00207"></a>00207 
<a name="l00208"></a>00208 <span class="comment">/************ low level data pushing commands **********/</span>
<a name="l00209"></a>00209 
<a name="l00210"></a>00210 <span class="comment">// send</span>
<a name="l00211"></a><a class="code" href="class_liquid_crystal___s_r.html#a03821351a32db07cb7e42c8c11ce8d47">00211</a> <span class="keywordtype">void</span> <a class="code" href="class_liquid_crystal___s_r.html#a03821351a32db07cb7e42c8c11ce8d47">LiquidCrystal_SR::send</a>(uint8_t value, uint8_t mode) 
<a name="l00212"></a>00212 {
<a name="l00213"></a>00213    uint8_t val1, val2;
<a name="l00214"></a>00214    
<a name="l00215"></a>00215    <span class="comment">// If _two_wire - clear the shiftregister first.</span>
<a name="l00216"></a>00216    <span class="comment">// ----------------------------------------------</span>
<a name="l00217"></a>00217    <span class="keywordflow">if</span> ( _two_wire ) 
<a name="l00218"></a>00218    {
<a name="l00219"></a>00219       shiftOut ( _srdata_pin, _srclock_pin, MSBFIRST, 0x00 );
<a name="l00220"></a>00220    }
<a name="l00221"></a>00221    digitalWrite( _enable_pin, LOW );
<a name="l00222"></a>00222    
<a name="l00223"></a>00223    <span class="comment">// Divide byte in two nibbles (val1 and val2), include the RS signal</span>
<a name="l00224"></a>00224    <span class="comment">// and format it for shiftregister output wiring to the LCD</span>
<a name="l00225"></a>00225    mode = mode ? <a class="code" href="_liquid_crystal___s_r_8h.html#afdaa2bbb2cc185700864ac8d7a570ced">SR_RS_BIT</a> : 0; <span class="comment">// RS bit; LOW: command.  HIGH: character.</span>
<a name="l00226"></a>00226    val1 = mode | <a class="code" href="_liquid_crystal___s_r_8h.html#a0075b041d82abb47f279dce482e7b087">SR_EN_BIT</a> | ((value &gt;&gt; 1) &amp; 0x78); <span class="comment">// upper nibble</span>
<a name="l00227"></a>00227    val2 = mode | <a class="code" href="_liquid_crystal___s_r_8h.html#a0075b041d82abb47f279dce482e7b087">SR_EN_BIT</a> | ((value &lt;&lt; 3) &amp; 0x78); <span class="comment">// lower nibble</span>
<a name="l00228"></a>00228    
<a name="l00229"></a>00229    shiftOut ( _srdata_pin, _srclock_pin, MSBFIRST, val1 );
<a name="l00230"></a>00230    
<a name="l00231"></a>00231    <span class="comment">// LCD ENABLE PULSE</span>
<a name="l00232"></a>00232    <span class="comment">//</span>
<a name="l00233"></a>00233    <span class="comment">// While this library is written with a shift register without an output</span>
<a name="l00234"></a>00234    <span class="comment">// latch in mind, it can work in 3-wire mode with a shiftregister with a</span>
<a name="l00235"></a>00235    <span class="comment">// latch. The shiftregister latch pin (STR, RCL or similar) is then</span>
<a name="l00236"></a>00236    <span class="comment">// connected to the LCD enable pin. The LCD is (very likely) slower</span>
<a name="l00237"></a>00237    <span class="comment">// to read the Enable pulse, and then reads the new contents of the SR.</span>
<a name="l00238"></a>00238    digitalWrite( _enable_pin, HIGH );
<a name="l00239"></a>00239    <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="l00240"></a>00240    digitalWrite( _enable_pin, LOW );
<a name="l00241"></a>00241 
<a name="l00242"></a>00242    <span class="comment">// clear shiftregister</span>
<a name="l00243"></a>00243    <span class="comment">// ---------------------------</span>
<a name="l00244"></a>00244    <span class="keywordflow">if</span> ( _two_wire ) 
<a name="l00245"></a>00245    {
<a name="l00246"></a>00246       shiftOut ( _srdata_pin, _srclock_pin, MSBFIRST, 0x00 ); 
<a name="l00247"></a>00247    }
<a name="l00248"></a>00248    shiftOut ( _srdata_pin, _srclock_pin, MSBFIRST, val2 );
<a name="l00249"></a>00249    
<a name="l00250"></a>00250    <span class="comment">// LCD ENABLE PULSE, se above comment</span>
<a name="l00251"></a>00251    digitalWrite( _enable_pin, HIGH );
<a name="l00252"></a>00252    <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="l00253"></a>00253    digitalWrite( _enable_pin, LOW );
<a name="l00254"></a>00254    <a class="code" href="_l_c_d_8h.html#a6eac41e4be58d7736ac0c19de225c0dc">waitUsec</a>( 40 );                <span class="comment">// commands need &gt; 37us to settle</span>
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 
<a name="l00257"></a>00257 <span class="comment">//</span>
<a name="l00258"></a>00258 <span class="comment">// write4bits</span>
<a name="l00259"></a>00259 <span class="keywordtype">void</span> LiquidCrystal_SR::write4bits(uint8_t value) 
<a name="l00260"></a>00260 {
<a name="l00261"></a>00261    uint8_t val1;
<a name="l00262"></a>00262    
<a name="l00263"></a>00263    <span class="comment">// clear shiftregister</span>
<a name="l00264"></a>00264    <span class="comment">// --------------------------</span>
<a name="l00265"></a>00265    <span class="keywordflow">if</span> ( _two_wire ) 
<a name="l00266"></a>00266    {
<a name="l00267"></a>00267       shiftOut ( _srdata_pin, _srclock_pin, MSBFIRST, 0x00 ); 
<a name="l00268"></a>00268    }
<a name="l00269"></a>00269    digitalWrite( _enable_pin, LOW );
<a name="l00270"></a>00270 
<a name="l00271"></a>00271    <span class="comment">// Discard lower nibble</span>
<a name="l00272"></a>00272    <span class="comment">// and format it for shiftregister output wiring to the LCD</span>
<a name="l00273"></a>00273    val1 = <a class="code" href="_liquid_crystal___s_r_8h.html#a0075b041d82abb47f279dce482e7b087">SR_EN_BIT</a> | ((value &gt;&gt; 1) &amp; 0x78);
<a name="l00274"></a>00274    shiftOut ( _srdata_pin, _srclock_pin, MSBFIRST, val1 );
<a name="l00275"></a>00275 
<a name="l00276"></a>00276    <span class="comment">// LCD ENABLE PULSE</span>
<a name="l00277"></a>00277    <span class="comment">//</span>
<a name="l00278"></a>00278    <span class="comment">// While this library is written with a shift register without an output</span>
<a name="l00279"></a>00279    <span class="comment">// latch in mind, it can work in 3-wire mode with a shiftregister with a</span>
<a name="l00280"></a>00280    <span class="comment">// latch. The shiftregister latch pin (STR, RCL or similar) is then</span>
<a name="l00281"></a>00281    <span class="comment">// connected to the LCD enable pin. The LCD is (very likely) slower</span>
<a name="l00282"></a>00282    <span class="comment">// to read the Enable pulse, and then reads the new contents of the SR.</span>
<a name="l00283"></a>00283    digitalWrite( _enable_pin, HIGH );
<a name="l00284"></a>00284    <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="l00285"></a>00285    digitalWrite( _enable_pin, LOW );
<a name="l00286"></a>00286    
<a name="l00287"></a>00287    <a class="code" href="_l_c_d_8h.html#a6eac41e4be58d7736ac0c19de225c0dc">waitUsec</a>( 40 );               <span class="comment">// commands need &gt; 37us to settle</span>
<a name="l00288"></a>00288 }
<a name="l00289"></a>00289 
<a name="l00290"></a>00290 
<a name="l00291"></a>00291 
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