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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>comedi_arm_channel</title><link rel="stylesheet" type="text/css" href="comedilib.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Comedi"><link rel="up" href="functionreference.html#idm5166" title="5.4.6. Extensions"><link rel="prev" href="func-ref-comedi-arm.html" title="comedi_arm"><link rel="next" href="func-ref-comedi-digital-trigger-disable.html" title="comedi_digital_trigger_disable"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">comedi_arm_channel</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="func-ref-comedi-arm.html">Prev</a> </td><th width="60%" align="center">5.4.6. Extensions</th><td width="20%" align="right"> <a accesskey="n" href="func-ref-comedi-digital-trigger-disable.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="func-ref-comedi-arm-channel"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>comedi_arm_channel — arm a subdevice channel</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <comedilib.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">comedi_arm_channel</b>(</code></td><td>comedi_t * <var class="pdparam">device</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">subdevice</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">channel</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">source</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm5238"></a><h2>
Status
</h2><p>
alpha
</p></div><div class="refsect1"><a name="idm5241"></a><h2>
Description
</h2><p>
This function arms a specified channel of a subdevice. It may, for
example, arm a counter to begin counting. The <em class="parameter"><code>source</code></em> parameter specifies what source
should trigger the subdevice to begin. The possible sources are
driver-dependant. This function is only useable on subdevices that
provide support for the <code class="constant">INSN_CONFIG_ARM</code>
configuration instruction. Some subdevices treat this as an
instruction to arm the whole subdevice and ignore the specified
channel. For such subdevices, <code class="function"><a class="link" href="func-ref-comedi-arm.html" title="comedi_arm">comedi_arm</a></code> is normally
called instead.
</p></div><div class="refsect1"><a name="idm5248"></a><h2>
Return value
</h2><p>
<code class="literal">0</code> on success, <code class="literal">-1</code> on error.
</p><p>
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