123 lines
6.7 KiB
HTML
123 lines
6.7 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="6" MadCap:lastHeight="94" MadCap:lastWidth="853" MadCap:disableMasterStylesheet="true" MadCap:tocPath="" MadCap:InPreviewMode="false" MadCap:PreloadImages="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" lang="en-us" xml:lang="en-us" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="Default.xml" MadCap:SearchType="Stem">
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<head><title>INPUT</title>
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<link href="../../SkinSupport/MadCap.css" rel="stylesheet" />
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<link href="../../Resources/Stylesheets/BSE_Help.css" rel="stylesheet" />
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<script src="../../SkinSupport/MadCapAll.js" type="text/javascript">
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</script>
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</head>
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<body>
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<h1 class="code">INPUT</h1>
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<div class="ImagePlusCaption">
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<div class="Col2">
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<p>
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<img src="../../graphics/pgm_icon1.gif" border="0" alt="BS1 icon" title="BS1 icon" />
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<img src="../../graphics/pgm_icon2.gif" border="0" alt="BS2 icon" title="BS2 icon" />
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<img src="../../graphics/pgm_icon2e.gif" border="0" alt="BS2e icon" title="BS2e icon" />
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<img src="../../graphics/pgm_icon2sx.gif" border="0" alt="BS2sx icon" title="BS2sx icon" />
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<img src="../../graphics/pgm_icon2p.gif" border="0" alt="BS2p icon" title="BS2p icon" />
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<img src="../../graphics/pgm_icon2pe.gif" border="0" alt="BS2pe icon" title="BS2pe icon" />
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<img src="../../graphics/pgm_icon2px.gif" border="0" alt="BS2px icon" title="BS2px icon" />
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</p>
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</div>
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<p style="text-align: right;"><a href="../ExampleTopics/InputOutputEx.htm" target="" title="" alt="" class="MCXref_0">INPUT / OUTPUT Examples</a>
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</p>
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<p> </p>
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</div>
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<p class="clear"> </p>
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<p> </p>
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<p class="PlainText">Syntax: <span class="keyword_in_text">INPUT </span> <![CDATA[ ]]><i>Pin</i></p>
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<h2>Function</h2>
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<p class="PlainText">Make the specified pin an input.
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</p>
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<ul>
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<li value="1"><b><i>Pin</i></b> is a variable/constant/expression* (0 - 15) that specifies
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which I/O pin to set to input mode.</li>
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</ul>
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<p class="PlainText">*<img src="../../graphics/bs1note.gif" style="vertical-align: super;" /> Note: expressions are not allowed as arguments on the BS1. The range
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of the <i>Pin</i> argument on the BS1 is 0–7.</p>
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<h2>Quick Facts</h2>
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<table width="100%" cellpadding="4" cellspacing="0" border="1">
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<tr>
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<td align="center" width="150" bgcolor="#CFCFCF"> </td>
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<td align="center" width="40%" bgcolor="#CFCFCF">BS1</td>
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<td align="center" width="40%" bgcolor="#CFCFCF">All BS2 Models</td>
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</tr>
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<tr>
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<td align="center" bgcolor="#CFCFCF">Input Pin Variables</td>
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<td align="center">PINS: PIN0 through PIN7</td>
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<td align="center">INS; IN0 through IN15</td>
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</tr>
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<tr>
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<td align="center" bgcolor="#CFCFCF">Related Commands</td>
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<td align="center" colspan="2">
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<p colspan="2" align="center"><a href="OUTPUT.htm" target="" title="" alt="" class="MCXref_0">OUTPUT</a>, <a href="REVERSE.htm" target="" title="" alt="" class="MCXref_0">REVERSE</a></p>
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</td>
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</tr>
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</table>
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<h2>Explanation</h2>
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<p class="PlainText">There are several ways to make a pin an input. When the BASIC Stamp is reset, all
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of the pins are inputs. Commands that rely on input pins, like <span class="keyword_in_text">PULSIN</span> and
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<span class="keyword_in_text">SERIN</span>, automatically change the specified pin to input. Writing 0s to
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particular bits of the variable DIRS makes the corresponding pins inputs. And
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then there’s the <span class="keyword_in_text">INPUT</span> command.</p>
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<p class="PlainText">When a pin is an input, your program can check its state by reading from
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the corresponding INS variable (PINS on the BS1). For example:</p>
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<p>
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<img src="../../graphics/bs1_inline.gif" width="9" height="16" border="0">
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</img>
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</p><pre class="BScode" xml:space="preserve">
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Setup:
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INPUT 4
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Hold:
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IF PIN4 = 0 THEN Hold ' Stay here until P4 is 1
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</pre>
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<p>
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<img src="../../graphics/bs2all_inline.gif" border="0">
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</img>
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</p><pre class="BScode" xml:space="preserve">
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Setup:
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INPUT 4
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Hold:
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IF (IN4 = 0) THEN Hold ' Stay here until P4 is 1
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</pre>
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<p class="PlainText">What happens if your program writes to the OUTS bit (PINS bit on the
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BS1) of a pin that is set up as an input? The value is stored in OUTS (PINS
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on the BS1), but has no effect on the outside world. If the pin is changed to
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output, the last value written to the corresponding OUTS bit (or PINS bit
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on the BS1) will appear on the pin. The Example program shows how this works.</p>
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<div class="Col2">
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<div class="MasterFoot">
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<p MadCap:conditions="BSEconditions.BSEWebHelp (Primary)-INCLUDE"><a href="../../HomeTopics/HomePage.htm">Go to Welcome page</a>
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</p>
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</div>
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</div>
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<div class="Col2">
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<div class="MasterFoot">
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<p style="text-align: right;"><span class="ContactInfoProjectName">BASIC Stamp Help</span> <![CDATA[ ]]><span class="ContactInfoVersion#">Version 2.5.4</span> <![CDATA[ ]]></p>
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<p style="text-align: right;">Copyright © <span class="ContactInfoCompanyName">Parallax Inc.</span></p>
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<p style="text-align: right;"><span class="SystemShortDate">8/8/2012</span>
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</p>
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</div>
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</div>
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