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<task id="GUID-57A909F3-EAEA-5FE2-B620-E21204794497" xml:lang="en"><title>How

to Load the Physical Device Driver and Logical Device Driver: Tutorial</title><shortdesc>When testing using the console, all drivers need to be loaded directly.

This tutorial describes how to load the drivers required for the Serial Communications

Server. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>

<steps id="GUID-8D0D239F-51F9-512A-8405-ADD01AE1660B">

<step id="GUID-21876E62-D2A9-510A-BAD2-CB3E4271A02B"><cmd>Identify the names

of the physical and logical device drivers required.</cmd>

<info><p> The names of device drivers change since variations are created

for different platforms: the ecuart and infra-red logical device driver is

usually called <filepath>ECOMM</filepath> while the USB logical device driver

is usually called <filepath>EUSBC</filepath>. For fast infra-red the logical

device driver is usually called <filepath>EFIR</filepath>. For ecuart, infra-red

and USB the physical device driver is usually called <filepath>ECDRV</filepath> on

the emulator. For devices the physical device drivers have a variety of names.

The euart and USB the physical device driver is usually called <filepath>EUART</filepath> or <filepath>EUART</filepath> with

a number for each port from base 1, for example <filepath>EUART1</filepath> and <filepath>EUART2</filepath>.

For infra-red the physical device driver is usually called <filepath>EUART2</filepath>.

For fast infra-red the physical device driver is usually called <filepath>DIFIR</filepath> for

both emulator and devices. </p></info>

</step>

<step id="GUID-AE7AFB08-535A-5195-AF0D-4401390D8518"><cmd>Call <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-1D773C95-A0DE-38EC-85BA-82162B2DC62E"><apiname>User::LoadPhysicalDevice</apiname></xref> to

load the physical device driver and check the return code.</cmd>

<info>A return code of <codeph>KErrAlreadyExists</codeph> can be ignored. </info>

</step>

<step id="GUID-CE68C060-4A44-5547-9DE6-A81DEAC367B1"><cmd>Call <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-68D7C877-B611-3FCC-B85D-708501C1B66C"><apiname>User::LoadLogicalDevice</apiname></xref> to

load the logical device driver and check the return code. </cmd>

<info>A return code of <codeph>KErrAlreadyExists</codeph> can be ignored. </info>

</step>

<step id="GUID-E3332825-E22D-5D90-AA89-A6FD20500A9D"><cmd>Start the <xref href="GUID-2FED5145-58E4-5560-8E52-6BD499EECE13.dita">RootServer</xref> by calling <xref href="GUID-CFCBC5A6-FB1F-3DD7-B275-9B9C7389A8A7.dita"><apiname>StartC32()</apiname></xref>.</cmd>

<info> The RootServer loads the Serial Communications Server. </info>

</step>

</steps>

<example><title>Example</title> <codeblock id="GUID-B45CC19A-856B-54C2-84BD-840E72391F20" xml:space="preserve">#if defined (__WINS__)

    #define PDD_NAME _L("ECDRV")

#else

    #define PDD_NAME _L("EUART1")

#endif

#define LDD_NAME _L("ECOMM")

TInt r = User::LoadPhysicalDevice (PDD_NAME);

if (r != KErrNone && r != KErrAlreadyExists) 

    {

    User::Leave(r);

    }

r = User::LoadLogicalDevice (LDD_NAME);

if (r != KErrNone && r != KErrAlreadyExists) 

    {

    User::Leave(r);

    }

r = StartC32(); 

User::LeaveIfError(r);</codeblock> </example>

</taskbody><related-links>

<link href="GUID-D90C86C6-B85D-5941-9919-3725A9FFD548.dita"><linktext>Text shell

(eshell)</linktext></link>

</related-links></task>