1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

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

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 /**

    17  @file

    18  @internalComponent

    19 */

    20 

    21 

    22 #ifndef HCTLBCSPSEQUENCER_H

    23 #define HCTLBCSPSEQUENCER_H

    24 

    25 #include <e32base.h>

    26 

    27 class CDelay;

    28 class CHCTLBcsp;

    29 class RBusDevComm;

    30 class CHCTLBcspFrameQueue;

    31 class CHCTLBcspSender;

    32 class CRxHctlBcspFrame;

    33 

    34 NONSHARABLE_CLASS(CHCTLBcspSequencer) :public CBase

    35 /**

    36 CHCTLBcspSequencer

    37 Provides the Sequencing layer as described in the BCSP Spec. this permits reliable retransmission

    38 of ACL and Command Data and in the final version of BCSP a windowing mechanism allowing multiple 

    39 frames < 7 to be transmitted without acknowledgment for each individual frame.

    40   	

    41 This class is not intended for derivation.

    42 */

    43 	{

    44 public:

    45 	static CHCTLBcspSequencer* NewL(CHCTLBcsp& aHCTLbcsp, RBusDevComm& aPort,CHCTLBcspFrameQueue& aBcspFrameQueue);

    46 	~CHCTLBcspSequencer();

    47 	

    48 	void WakeUp();			// Set the state machine to ESending and then in Entry() does the same as SendNextPacket()

    49 	void SendNextPacket();	// Gets next packet from iBcspFrameQueue and Sends it directly to the UART

    50 	void HandleRxAck();		// Triggers removal of Acked frames

    51 	void SendPacket(TDesC8* aFrame, TBool aIsReliable);

    52 

    53 	TInt SendQueuedFrame();

    54 

    55 	void HandleRx(CRxHctlBcspFrame* aFrame);

    56 	

    57 	TUint8 TxAck() const;

    58 	void ResendState();

    59 	void HandleRxAckTimeout();

    60 

    61  	//BCSP peer reset functions

    62  	void Reset();

    63  	void HandlePeerReset();

    64 

    65 private:

    66 	CHCTLBcspSequencer(CHCTLBcsp& aHCTLbcsp, CHCTLBcspFrameQueue& aBcspFrameQueue);

    67     void ConstructL(RBusDevComm& aPort);

    68 	void UpdateTxAckVal();

    69 	void StartRxAckTimer();

    70 	void StartTxAckTimer();

    71 	void TxAckMsg();

    72 	

    73 	static TInt TxTimeout(TAny* aThis);

    74 	static TInt RxTimeout(TAny* aThis);

    75 

    76 private:

    77 	enum TBcspRelRxState

    78 		{

    79 		EIdle,

    80 		EReceiving

    81 		};

    82 

    83 	TUint8 iRxAck;	//Updated by HandleRx()

    84 	TUint8 iRxSeq;

    85 	TUint8 iRxSeqExpected;

    86 	TUint8 iRxSeqLast;

    87 	TUint8 iPacketAvail;

    88 

    89 	TUint8 iTxAck;

    90 

    91 	TBcspRelRxState iRelRxState;

    92 

    93 	TUint8 iRxTimeoutCount;

    94 	CDelay* iRxAckTimer;

    95 	CDelay* iTxAckTimer;

    96 

    97 	CHCTLBcsp& iHctlBcsp;

    98 	CHCTLBcspFrameQueue& iFrameQueue;

    99 

   100 	CHCTLBcspSender* iSender;

   101 	};

   102 	

   103 #endif // HCTLBCSPSEQUENCER_H