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89 lines
2.8 KiB
HTML
89 lines
2.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>io.c (Embed with GNU)</title>
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<meta name="description" content="io.c (Embed with GNU)">
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<meta name="keywords" content="io.c (Embed with GNU)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="leds_002ec.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Code-Listings.html#Code-Listings" rel="up" title="Code Listings">
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<link href="leds_002ec.html#leds_002ec" rel="next" title="leds.c">
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<link href="mvme_002eS.html#mvme_002eS" rel="prev" title="mvme.S">
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</style>
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</head>
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<body lang="en">
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<a name="io_002ec"></a>
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<div class="header">
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<p>
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Next: <a href="leds_002ec.html#leds_002ec" accesskey="n" rel="next">leds.c</a>, Previous: <a href="mvme_002eS.html#mvme_002eS" accesskey="p" rel="prev">mvme.S</a>, Up: <a href="Code-Listings.html#Code-Listings" accesskey="u" rel="up">Code Listings</a> [<a href="leds_002ec.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="I_002fO-code-sample"></a>
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<h3 class="section">A.5 I/O code sample</h3>
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<div class="example">
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<pre class="example">#include "w89k.h"
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/*
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* outbyte -- shove a byte out the serial port. We wait till the byte
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*/
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int
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outbyte(byte)
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unsigned char byte;
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{
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while ((inp(RS232REG) & TRANSMIT) == 0x0) { } ;
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return (outp(RS232PORT, byte));
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}
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/*
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* inbyte -- get a byte from the serial port
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*/
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unsigned char
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inbyte()
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{
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while ((inp(RS232REG) & RECEIVE) == 0x0) { };
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return (inp(RS232PORT));
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}
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</pre></div>
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</body>
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</html>
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