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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>parport_wait_peripheral</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="parportdev.html" title="Chapter&#160;3.&#160;Parallel Port Devices" /><link rel="prev" href="API-parport-wait-event.html" title="parport_wait_event" /><link rel="next" href="API-parport-negotiate.html" title="parport_negotiate" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">parport_wait_peripheral</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-parport-wait-event.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;3.&#160;Parallel Port Devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-parport-negotiate.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-parport-wait-peripheral"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>parport_wait_peripheral &#8212; 
     wait for status lines to change in 35ms
 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <strong class="fsfunc">parport_wait_peripheral </strong>(</code></td><td>struct parport * <var class="pdparam">port</var>, </td></tr><tr><td>&#160;</td><td>unsigned char <var class="pdparam">mask</var>, </td></tr><tr><td>&#160;</td><td>unsigned char <var class="pdparam">result</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404962340304"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>port</code></em></span></dt><dd><p>
     port to watch
    </p></dd><dt><span class="term"><em class="parameter"><code>mask</code></em></span></dt><dd><p>
     status lines to watch
    </p></dd><dt><span class="term"><em class="parameter"><code>result</code></em></span></dt><dd><p>
     desired values of chosen status lines
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404962333056"></a><h2>Description</h2><p>
   This function waits until the masked status lines have the
   desired values, or until 35ms have elapsed (see IEEE 1284-1994
   page 24 to 25 for why this value in particular is hardcoded).
   The <em class="parameter"><code>mask</code></em> and <em class="parameter"><code>result</code></em> parameters are bitmasks, with the bits
   defined by the constants in parport.h: <code class="constant">PARPORT_STATUS_BUSY</code>,
   and so on.
   </p><p>

   The port is polled quickly to start off with, in anticipation
   of a fast response from the peripheral.  This fast polling
   time is configurable (using /proc), and defaults to 500usec.
   If the timeout for this port (see <code class="function">parport_set_timeout</code>) is
   zero, the fast polling time is 35ms, and this function does
   not call <code class="function">schedule</code>.
   </p><p>

   If the timeout for this port is non-zero, after the fast
   polling fails it uses <code class="function">parport_wait_event</code> to wait for up to
   10ms, waking up if an interrupt occurs.
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