basebandabstraction/basebandchanneladaptor/Inc/Bca.h
author hgs
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/**
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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* Baseband Channel Adaptor(BCA) APIs.
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* This file contains all the APIs required to implement a BCA interface for Symbian OS.
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* 
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*
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*/
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/**
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 @file
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 @publishedPartner
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 @released
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*/
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#ifndef BCA_H
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#define BCA_H
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#include <e32std.h>
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#include <e32des8.h>
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/** This namespace includes the BCA component names.*/
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namespace BasebandChannelAdaptation
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{
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/** 
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* The abstract interface between NIF and Bearer Transport. 
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* The client (caller) of MBca is the one conceptually living in a specific Comms Stack layer 
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* and it is entirely responsible for implementing the function of that layer as imposed by the 
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* respective protocol technology. On the contrary, the MBca is merely a HAI (Hardware Abstraction 
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* Interface) and its implementation is protocol/technology agnostic. This means that the MBca 
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* is solely responsible for passing (entire) data frames between its caller and the bearer transport 
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* as well as for propagating error conditions towards the client and for propagating flow 
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* control conditions in both directions. 
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*
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* @publishedPartner 
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* @released 
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*/ 
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class MBca
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	{
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public:
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	/** 
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	* Deletes the allocated data in BCA the MBca implementation and all resources it owns. 
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	* The method is the logical reverse operation to MBcaFactory::NewBcaL()
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	*/
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	virtual void Release()=0;
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	/** 
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	* Informs that the BCA is required by the client(for instance, Raw IP NIF)
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	*
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	* @param aStatus complete status, KErrNone if succesful, system-wide error code otherwise.
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	* All other error codes reported are fatal (denoting the MBca interface has failed to open 
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	* and is not good for transferring data) including KErrCancel if request cancelled.
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	*
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	* @param aChannelId an optional parameter, used to open the BCA. It is implementation dependent, 
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	* It can be empty descriptor when it is not used. 
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	*/ 
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	virtual void Open(TRequestStatus& aStatus, const TDesC& aChannelId)=0;
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	/** 
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	* Close is a "emergency"/synchronous termination which closes the BCA immediately. 
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	* Informs the BCA is no longer required by the client. 
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	* The method is the logical reverse operation to ::Open(). 
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	* Close cancels all pending asynchronous requests with KErrCancel.
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	*/ 
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	virtual void Close()=0;
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	/** 
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	* Shutdown is a graceful, asynchronous termination which can take some time. It is called under 
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	* normal stop cases. 
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	* Informs the BCA is no longer required by the client and can release its resources. 
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	* The method is the logical reverse operation to ::Open().
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	* Shutdown cancels all other pending asynchronous requests with KErrCancel.
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	*
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	* @param aStatus complete status, KErrNone if succesful KErrCancel if request cancelled.
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	*/ 
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	virtual void Shutdown(TRequestStatus& aStatus)=0;
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	/**
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	* Queues a Read, reads data from underlying baseband channel. 
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	* Used for for uplink flow control, i.e. the client will refrain from calling MBca::Read if 
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	* in a flow off condition.
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	*
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	* @param aStatus complete status, KErrNone if succesful, system-wide error code otherwise.
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	* All other errors reported are fatal (the MBca became defunct and can no loger be used to 
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	* send and receive data) except KErrCancel if request cancelled and KErrNoMemory, KErrCommsParity, 
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	* KErrCommsOverrun, KErrCommsFrame, in which case the MBca stays functional and is only reporting 
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	* failure to read the next frame. The caller may attempt to ::Read again. 
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	*
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	* @param aBuf buffer for data to be read. The caller owns the buffer and is responsible for keeping 
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	* its reference valid at least until the MBca::Read call is completed. The caller is responsible 
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	* for supplying a large enough buffer for the MBca implementation to fit the entire pending frame. 
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	* If the caller fails to supply a large enough buffer, the MBca implementation is free to error the 
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	* ::Read with KErrNoMemory.
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	*
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	* @note the client must not modify the buffer until this call is completed. 
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	*/ 
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	virtual void Read(TRequestStatus& aStatus, TDes8& aBuf)=0;
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	/** 
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	* Queues a Write, write data to underlying baseband channel. 
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	* Used for downlink flow control. The MBca implementation will not complete a pending ::Write if 
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	* in flow off condition. 
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	*	
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	* @param aStatus the complete status, KErrNone if succesful, system-wide error code otherwise. 
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	* All errors reported are fatal (the MBca became defunct and can no loger be used to 
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	* send and receive data) except KErrCancel if request cancelled and KErrNoMemory and KErrNotReady,
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	* in which case the MBca implementation indicates the failure to send the current frame. The caller 
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	* may drop or resend the current packet depending on its logic. 
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	*
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	* @param aBuf the buffer to sent. The caller owns the buffer and is responsible for keeping 
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	* its reference valid at least until the MBca::Write call is completed.
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	*
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	* @note the client must not modify the buffer until this call is completed.
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	*/
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	virtual void Write(TRequestStatus& aStatus, const TDesC8& aBuf)=0;
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	/** 
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	* Cancels the pending read request with KErrCancel.
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	*/ 
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	virtual void CancelRead()=0;
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	/** 
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	* Cancels the pending write request with KErrCancel.
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	*/
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	virtual void CancelWrite()=0;
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	/** 
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	* The BCA control function,gets or sets the information of the BCA in an asynchronous manner.
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	*
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	* @param aStatus complete status, KErrNone if succesful, system-wide error code otherwise.
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	* All errors reported are fatal (the MBca became defunct and can no loger be used to 
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	* send and receive data) except KErrNotSupported, no functionality provided and KErrAlreadyExists.
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	*
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	* @param aOptLevel option level to be used. 
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	*
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	* @param aOptName option name to be used. 
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	*
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	* @param aOpt an optional parameter,holds the option value on return or the option value to be set. 
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	*
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	* @return none. 
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	*/ 
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	virtual void Ioctl(TRequestStatus& aStatus, TUint aOptLevel, TUint aOptName, TDes8& aOpt)=0;
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	/**
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	* Cancels the pending Ioctl request with KErrCancel.
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	*/
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	virtual void CancelIoctl()=0;
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	};
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/**
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* Control option level.
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*/
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const TUint KBcaOptLevelGeneric 		= 0x0194;
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const TUint KBcaOptLevelExtSerial 		= 0x0195;
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/**
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* C32 BCA capability
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*/
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const TUint KBcaCapSerial			= 0x01; //Serial port capability supported
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/**
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* Control option name
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*/
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const TUint KBCAMru	                = 0x12;
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const TUint KBCAMtu	                = 0x13;
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const TUint KBCASpeedMetric	        = 0x14;
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const TUint KBCACaps	            = 0x15;
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const TUint KBCASetIapId	        = 0x16;
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const TUint KBCASetBcaStack	        = 0x1e;
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/** 
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Purges the buffers */
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const TUint KBCAResetBuffers        = 0x1f;
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const TUint KSerialCaps	            = 0x17;
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const TUint KSerialConfig	        = 0x18;
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const TUint KSerialPortName	        = 0x19;
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const TUint KSerialSetConfig	    = 0x1a;
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const TUint KSerialSetCsyName	    = 0x1b;
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const TUint KVersionNumber	        = 0x1c;
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const TUint KSerialSetCommRole	    = 0x1d;
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/**
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Set the size of receive & transmit buffers.
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Provided for compatibility with C32 RComm */
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const TUint KSerialSetTxRxBufferSize  = 0x2a;
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/** Retrieves the size of the receive & transmit buffers */
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const TUint KSerialTxRxBufferSize     = 0x2b;
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/** Set and/or clear signal lines */
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const TUint KSerialSetControlLines	  = 0x2c;
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struct TSerialSetControlLines {
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/**
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Structure associated with KSerialSetSignals Ioctl.
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Indicates which control lines to set/clear. 
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*/
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	TUint	iSetMask;
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	TUint	iClearMask;
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};
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//
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// Bitmasks specifying which buffer to reset. Used with KBCaResetBuffers
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//
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/** Reset Rx buffer only */
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const TUint KResetRxBuf = 0x01;
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/** Reset Tx buffer only */
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const TUint KResetTxBuf = 0x02;
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/** Monitor EIA-232 control lines and take action specified. */
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const TUint KSerialMonitorControlLines = 0x30;
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/** Turn control line monitoring off - do not fail on line change */
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const TUint KMonitorOff = 0x0;
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/** Fail when BCA-specific lines go from high to low. 
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This is the "Default" option, where the BCA itself selects what lines to monitor 
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This mask must not be specified in conjunction with other masks, as the BCA will monitor
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& fail on its specific lines ONLY. The other lines will be ignored.*/
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const TUint KFailBcaSpecificOnly = 0xFFFFFFFF; 
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}
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#endif // BCA_H