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////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2006-2012 MStar Semiconductor, Inc.
// All rights reserved.
//
// Unless otherwise stipulated in writing, any and all information contained
// herein regardless in any format shall remain the sole proprietary of
// MStar Semiconductor Inc. and be kept in strict confidence
// (??MStar Confidential Information??) by the recipient.
// Any unauthorized act including without limitation unauthorized disclosure,
// copying, use, reproduction, sale, distribution, modification, disassembling,
// reverse engineering and compiling of the contents of MStar Confidential
// Information is unlawful and strictly prohibited. MStar hereby reserves the
// rights to any and all damages, losses, costs and expenses resulting therefrom.
//
////////////////////////////////////////////////////////////////////////////////
/**
*
* @file mstar_drv_common.c
*
* @brief This file defines the interface of touch screen
*
* @version v2.2.0.0
*
*/
/*=============================================================*/
// INCLUDE FILE
/*=============================================================*/
#include "mstar_drv_common.h"
/*=============================================================*/
// MACRO DEFINITION
/*=============================================================*/
/*=============================================================*/
// CONSTANT VALUE DEFINITION
/*=============================================================*/
/*=============================================================*/
// VARIABLE DEFINITION
/*=============================================================*/
static u32 _gCrc32Table[256];
/*=============================================================*/
// DATA TYPE DEFINITION
/*=============================================================*/
/*=============================================================*/
// GLOBAL FUNCTION DEFINITION
/*=============================================================*/
/// CRC
u32 DrvCommonCrcDoReflect(u32 nRef, s8 nCh)
{
u32 nValue = 0;
u32 i = 0;
for (i = 1; i < (nCh + 1); i ++)
{
if (nRef & 1)
{
nValue |= 1 << (nCh - i);
}
nRef >>= 1;
}
return nValue;
}
u32 DrvCommonCrcGetValue(u32 nText, u32 nPrevCRC)
{
u32 nCRC = nPrevCRC;
nCRC = (nCRC >> 8) ^ _gCrc32Table[(nCRC & 0xFF) ^ nText];
return nCRC;
}
void DrvCommonCrcInitTable(void)
{
u32 nMagicNumber = 0x04c11db7;
u32 i, j;
for (i = 0; i <= 0xFF; i ++)
{
_gCrc32Table[i] = DrvCommonCrcDoReflect(i, 8) << 24;
for (j = 0; j < 8; j ++)
{
_gCrc32Table[i] = (_gCrc32Table[i] << 1) ^ (_gCrc32Table[i] & (0x80000000L) ? nMagicNumber : 0);
}
_gCrc32Table[i] = DrvCommonCrcDoReflect(_gCrc32Table[i], 32);
}
}
u8 DrvCommonCalculateCheckSum(u8 *pMsg, u32 nLength)
{
s32 nCheckSum = 0;
u32 i;
for (i = 0; i < nLength; i ++)
{
nCheckSum += pMsg[i];
}
return (u8)((-nCheckSum) & 0xFF);
}
u32 DrvCommonConvertCharToHexDigit(char *pCh, u32 nLength)
{
u32 nRetVal = 0;
u32 i;
DBG("nLength = %d\n", nLength);
for (i = 0; i < nLength; i ++)
{
char ch = *pCh++;
u32 n = 0;
if ((i == 0 && ch == '0') || (i == 1 && ch == 'x'))
{
continue;
}
if ('0' <= ch && ch <= '9')
{
n = ch-'0';
}
else if ('a' <= ch && ch <= 'f')
{
n = 10 + ch-'a';
}
else if ('A' <= ch && ch <= 'F')
{
n = 10 + ch-'A';
}
if (i < 6)
{
nRetVal = n + nRetVal*16;
}
}
return nRetVal;
}
//------------------------------------------------------------------------------//
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