1 <?xml version="1.0" encoding="utf-8"?>

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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-7E3BBB18-3113-4312-AD91-897DE87C58BF" xml:lang="en"><title>SDIO

    13 PSU Implementation Tutorial</title><shortdesc>How to implement the platform-specific class for the Power Supply

    14 Unit of an SDIO-based hardware component.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    15 <p>The Power Supply Unit (PSU) functionality is provided by the <xref href="GUID-9BF2FEAC-F6B8-3071-A4AB-976E33354F1D.dita"><apiname>DSDIOPsu</apiname></xref> class.

    16 To enable power control in the SDIO Controller, you must implement the <codeph>PsuInfo()</codeph> function

    17 in the derived class of the <xref href="GUID-9BF2FEAC-F6B8-3071-A4AB-976E33354F1D.dita"><apiname>DSDIOPsu</apiname></xref> class. </p>

    18 <p>The <codeph>iNotLockedTimeOut</codeph> variable

    19 is used by the "card not locked" functionality and the value is tied to the

    20 reference board inactivity time-out. The <codeph>iInactivityTimeOut</codeph> variable

    21 is used to set a time-out value for the sleep mode of the SDIO cards. </p>

    22 <example><p><codeblock xml:space="preserve">void DMySdioPsu::PsuInfo(TPBusPsuInfo&amp; anInfo)

    23 	{

    24 	...

    25 	// Only for SDIO

    26 	anInfo.iNotLockedTimeOut = 5;    // Power down after 5 seconds of non-use (no clients registered)

    27 	anInfo.iInactivityTimeOut = 1;	// Enter Sleep mode within 1 Second of inactivity (clients registered)

    28 	...

    29 	return;

    30 	}

    31 </codeblock></p></example>

    32 </conbody></concept>