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/**
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* GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann
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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a>
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</p>
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<p class='vspace'></p><h2>shiftOut()</h2>
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<h4>Description</h4>
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<p>Shifts out a byte of data one bit at a time. Starts from either the most (i.e. the leftmost) or least (rightmost) significant bit. Each bit is written in turn to a data pin, after which a clock pin is pulsed (taken high, then low) to indicate that the bit is available.
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</p>
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<p class='vspace'></p><p>Note: if you're interfacing with a device that's clocked by rising edges, you'll need to make sure that the clock pin is low before the call to shiftOut(), e.g. with a call to digitalWrite(clockPin, LOW).
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</p>
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<p class='vspace'></p><p>This is a software implementation; see also the <a class='wikilink' href='SPI.html'>SPI library</a>, which provides a hardware implementation that is faster but works only on specific pins.
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p>shiftOut(dataPin, clockPin, bitOrder, value)
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</p>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>dataPin: the pin on which to output each bit (<em>int</em>)
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</p>
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<p class='vspace'></p><p>clockPin: the pin to toggle once the <strong>dataPin</strong> has been set to the correct value (<em>int</em>)
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</p>
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<p class='vspace'></p><p>bitOrder: which order to shift out the bits; either <strong>MSBFIRST</strong> or <strong>LSBFIRST</strong>.<br />(Most Significant Bit First, or, Least Significant Bit First)
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</p>
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<p class='vspace'></p><p>value: the data to shift out. (<em>byte</em>)
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>None
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</p>
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<p class='vspace'></p><h4>Note</h4>
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<p>The <strong>dataPin</strong> and <strong>clockPin</strong> must already be configured as outputs by a call to <a class='wikilink' href='PinMode.html'>pinMode</a>().
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</p>
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<p class='vspace'></p><p><strong>shiftOut</strong> is currently written to output 1 byte (8 bits) so it requires a two step operation to output values larger than 255.
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<div class='sourceblock ' id='sourceblock1'>
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<div class='sourceblocktext'><div class="arduino"><br />
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<span class="co1">// Do this for MSBFIRST serial</span><br />
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<span class="kw1">int</span> data <span class="sy0">=</span> <span class="nu0">500</span><span class="sy0">;</span><br />
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<span class="co1">// shift out highbyte</span><br />
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<span class="kw1">shiftOut</span><span class="br0">(</span>dataPin<span class="sy0">,</span> clock<span class="sy0">,</span> <span class="kw2">MSBFIRST</span><span class="sy0">,</span> <span class="br0">(</span>data <span class="sy0">>></span> <span class="nu0">8</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span> <br />
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<span class="co1">// shift out lowbyte</span><br />
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<span class="kw1">shiftOut</span><span class="br0">(</span>data<span class="sy0">,</span> clock<span class="sy0">,</span> <span class="kw2">MSBFIRST</span><span class="sy0">,</span> data<span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="co1">// Or do this for LSBFIRST serial</span><br />
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data <span class="sy0">=</span> <span class="nu0">500</span><span class="sy0">;</span><br />
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<span class="co1">// shift out lowbyte</span><br />
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<span class="kw1">shiftOut</span><span class="br0">(</span>dataPin<span class="sy0">,</span> clock<span class="sy0">,</span> <span class="kw2">LSBFIRST</span><span class="sy0">,</span> data<span class="br0">)</span><span class="sy0">;</span> <br />
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<span class="co1">// shift out highbyte </span><br />
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<span class="kw1">shiftOut</span><span class="br0">(</span>dataPin<span class="sy0">,</span> clock<span class="sy0">,</span> <span class="kw2">LSBFIRST</span><span class="sy0">,</span> <span class="br0">(</span>data <span class="sy0">>></span> <span class="nu0">8</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span> <br />
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</div></div>
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<div class='sourceblocklink'><a href='#' type='text/plain'>[Get Code]</a></div>
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</div>
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</p>
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<p class='vspace'></p><h4>Example</h4>
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<p><em>For accompanying circuit, see the <a class='wikilink' href='http://arduino.cc/en/Tutorial/ShiftOut'>tutorial on controlling a 74HC595 shift register</a>.</em>
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</p>
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<p class='vspace'></p><p>
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<div class='sourceblock ' id='sourceblock2'>
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<div class='sourceblocktext'><div class="arduino"><span class="co1">//**************************************************************//</span><br />
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<span class="co1">// Name : shiftOutCode, Hello World //</span><br />
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<span class="co1">// Author : Carlyn Maw,Tom Igoe //</span><br />
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<span class="co1">// Date : 25 Oct, 2006 //</span><br />
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<span class="co1">// Version : 1.0 //</span><br />
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<span class="co1">// Notes : Code for using a 74HC595 Shift Register //</span><br />
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<span class="co1">// : to count from 0 to 255 //</span><br />
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<span class="co1">//****************************************************************</span><br />
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<br />
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<span class="co1">//Pin connected to ST_CP of 74HC595</span><br />
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<span class="kw1">int</span> latchPin <span class="sy0">=</span> <span class="nu0">8</span><span class="sy0">;</span><br />
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<span class="co1">//Pin connected to SH_CP of 74HC595</span><br />
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<span class="kw1">int</span> clockPin <span class="sy0">=</span> <span class="nu0">12</span><span class="sy0">;</span><br />
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<span class="co1">////Pin connected to DS of 74HC595</span><br />
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<span class="kw1">int</span> dataPin <span class="sy0">=</span> <span class="nu0">11</span><span class="sy0">;</span><br />
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<br />
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<span class="kw1">void</span> <span class="kw3">setup</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="co1">//set pins to output because they are addressed in the main loop</span><br />
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<span class="kw1">pinMode</span><span class="br0">(</span>latchPin<span class="sy0">,</span> <span class="kw2">OUTPUT</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">pinMode</span><span class="br0">(</span>clockPin<span class="sy0">,</span> <span class="kw2">OUTPUT</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">pinMode</span><span class="br0">(</span>dataPin<span class="sy0">,</span> <span class="kw2">OUTPUT</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<br />
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<span class="kw1">void</span> <span class="kw3">loop</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="co1">//count up routine</span><br />
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<span class="kw1">for</span> <span class="br0">(</span><span class="kw1">int</span> j <span class="sy0">=</span> <span class="nu0">0</span><span class="sy0">;</span> j <span class="sy0"><</span> <span class="nu0">256</span><span class="sy0">;</span> j<span class="sy0">++</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="co1">//ground latchPin and hold low for as long as you are transmitting</span><br />
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<span class="kw1">digitalWrite</span><span class="br0">(</span>latchPin<span class="sy0">,</span> <span class="kw2">LOW</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">shiftOut</span><span class="br0">(</span>dataPin<span class="sy0">,</span> clockPin<span class="sy0">,</span> <span class="kw2">LSBFIRST</span><span class="sy0">,</span> j<span class="br0">)</span><span class="sy0">;</span> <br />
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<span class="co1">//return the latch pin high to signal chip that it </span><br />
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<span class="co1">//no longer needs to listen for information</span><br />
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<span class="kw1">digitalWrite</span><span class="br0">(</span>latchPin<span class="sy0">,</span> <span class="kw2">HIGH</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">delay</span><span class="br0">(</span><span class="nu0">1000</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<span class="br0">}</span> <br />
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</div></div>
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<div class='sourceblocklink'><a href='#' type='text/plain'>[Get Code]</a></div>
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</div>
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</p>
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<p class='vspace'></p><h4>See also</h4>
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<ul><li><a class='wikilink' href='ShiftIn.html'>shiftIn()</a>
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</li><li><a class='wikilink' href='SPI.html'>SPI</a>
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</li></ul><p><a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em>
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</p>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
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<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain.
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