1 /*

     2 * Copyright (c) 2009 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: Juha Kauppinen, Mika Hokkanen

    13 * 

    14 * Description: Photo Browser

    15 *

    16 */

    17 

    18 #include "IESensorDataFilter.h"

    19 

    20 CIESensorDataFilter::CIESensorDataFilter()

    21     {

    22     // No implementation required

    23     }

    24 

    25 CIESensorDataFilter::~CIESensorDataFilter()

    26     {

    27     delete iRingBuffer;

    28     }

    29 

    30 CIESensorDataFilter* CIESensorDataFilter::NewLC()

    31     {

    32     CIESensorDataFilter* self = new (ELeave) CIESensorDataFilter();

    33     CleanupStack::PushL(self);

    34     self->ConstructL();

    35     return self;

    36     }

    37 

    38 CIESensorDataFilter* CIESensorDataFilter::NewL()

    39     {

    40     CIESensorDataFilter* self = CIESensorDataFilter::NewLC();

    41     CleanupStack::Pop(); // self;

    42     return self;

    43     }

    44 

    45 void CIESensorDataFilter::ConstructL()

    46     {

    47     iRingBuffer = new (ELeave) TInt[KDataBufferSize];

    48     

    49     memset(iRingBuffer, '\0', KDataBufferSize * sizeof (TInt));

    50     

    51     iRingBufferPointer = iRingBuffer;

    52     

    53     }

    54 

    55 TInt CIESensorDataFilter::FilterSensorData(TInt aNewValue)

    56     {

    57     // Returns the average of the measures inside the circular buffer avoiding the noise  

    58     

    59     *iRingBufferPointer = aNewValue;

    60     

    61     iRingBufferPointer++;

    62     

    63     if(iRingBufferPointer >= (iRingBuffer + (KDataBufferSize - 1 )))

    64         {

    65         iRingBufferPointer = iRingBuffer;

    66         }

    67     

    68     TInt sum = 0;

    69     for (TInt i = 0; i < KDataBufferSize; i++ )

    70         {

    71         sum = sum + iRingBuffer[i];

    72         }

    73         

    74     return (sum / KDataBufferSize);

    75     }