1 /*

     2 * Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18 

    19 #ifndef __TRKFRAMINGLAYER_H__

    20 #define __TRKFRAMINGLAYER_H__

    21 

    22 #include "TrkCommPort.h"

    23 

    24 //

    25 // Forward declarations

    26 //

    27 class CTrkDispatchLayer;

    28 

    29 

    30 //

    31 // class CTrkFramingLayer

    32 //

    33 // Frames outgoing messages to the host and unframes incoming messages

    34 // from the host

    35 //

    36 class CTrkFramingLayer : public CBase

    37 {

    38 public:

    39 

    40 	enum TFramingState

    41 	{

    42 		eWaiting,

    43 		eFound,

    44 		eInFrame,

    45 		eFrameOverflow

    46 	};

    47 

    48 	CTrkFramingLayer(CTrkCommPort* aPort);

    49 	~CTrkFramingLayer();

    50 

    51 	void Listen(CTrkDispatchLayer* aDispatchLayer);

    52 	void StopListening();

    53 

    54 	void HandleByte(TUint8 aByte);

    55 

    56 	void RespondOkL(const TDesC8& aMsg);

    57 	void RespondErr(TUint8 aType, TUint8 aErr);

    58 	void InformEventL(const TDesC8& aMsg);

    59 	void SendRawMsgL(const TDesC8& aMsg);

    60 	

    61 	TBool IsBigEndian() { return iIsBigEndian; };

    62 	void ResetSequenceIDs() { iSequenceId = 1; iOutSequenceId = 1; };

    63 

    64 private:

    65 

    66 	void SendMsgL(const TDesC8& aMsg);

    67 

    68 	void DiscardFrame();

    69 	TBool ProcessFrame();

    70 

    71 	void IncrementSequenceId() { if (iSequenceId == 0xFF) iSequenceId = 1; else iSequenceId++; };

    72 	void IncrementOutSequenceId() { if (iOutSequenceId == 0xFF) iOutSequenceId = 1; else iOutSequenceId++; };

    73 

    74 private:

    75 

    76 	CTrkCommPort* iPort;

    77 	CTrkDispatchLayer* iDispatchLayer;

    78 

    79 	TFramingState iFramingState;

    80 	TBool iEscape;

    81 	TUint8 iFCS;

    82 

    83 	TBuf8<MAXMESSAGESIZE> iBuffer;	// contains the incoming messages

    84 	TUint8 iSequenceId;

    85 	TUint8 iOutSequenceId;

    86 		

    87 	TBool iIsBigEndian;

    88 	

    89 	HBufC8* iLastReply;

    90 };

    91 

    92 #endif // __TRKFRAMINGLAYER_H__