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    10 <!DOCTYPE concept

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

    12 <concept id="GUID-D003030D-8506-4210-9194-7A3819205D68" xml:lang="en"><title>Hardware

    13 Registers</title><shortdesc>This document describes how device drivers use hardware registers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <section id="GUID-47A733FB-8AC9-40A0-B879-C8C01B0AB1ED">           <p>The

    15 APIs to access hardware peripheral registers are provided by a Symbian base

    16 port. For example, the base port for the OMAP 2420 provides the <codeph>TOmap::SetRegister()</codeph> and <codeph>TOmap::GetRegister()</codeph> functions

    17 to access its peripheral controller registers. Peripheral drivers would generally

    18 use these APIs. Some examples: </p> <ol id="GUID-78156A20-8B2F-52FB-8A9F-159B6EE8714E">

    19 <li id="GUID-330A1D4C-E054-5DC3-A1F5-D85A9F600834"><p>To set the UART LCR

    20 register: </p> <codeblock id="GUID-35EE35C4-B89B-52D1-AC25-13C63BA55435" xml:space="preserve">TOmap::SetRegister8(iPortAddr+KHoUART_LCR, KHbUartLCRFifoConfig);</codeblock> </li>

    21 <li id="GUID-06BE62D4-4ED7-5186-A191-9908C10B1C7E"><p>To get the UART MDR

    22 register: </p> <codeblock id="GUID-64F8101B-CDDF-57E9-93D4-08B4BBA117CB" xml:space="preserve">TOmap::Register8(iPortAddr+KHoUART_MDR1)</codeblock> </li>

    23 <li id="GUID-D549BAC4-5842-5E8D-B086-28A5366DBC4D"><p>To modify only the specified

    24 bits of the register: here, the UART LCR register bit 6 is being set to 0

    25 (LCR[6] = 0) </p> <codeblock id="GUID-C705FB36-1D4E-557F-B30D-6B6AD21E5B5C" xml:space="preserve">TOmap::ModifyRegister8(iPortAddr+KHoUART_LCR,

    26                   (TUint8)KHtUartLCRBreakEnable,

    27                   (TUint8)KSetNone);</codeblock> </li>

    28 </ol>     </section>

    29 </conbody></concept>