Dynatronix LT1200X SERIES Specifications download pdf (Page 102)

Page 102 of 126 198-0853-02 Rev F

B.1.7 CRC Calculation

The CRC is used for error detection. The following is C code for the CRC calculation.

/////////////////////////////////////////////////////////////////////////////

// FUNCTION: CRC_Calc()

// DESCRIPTION: Calculate the CRC value for a string.

// PARAMETERS: Pointer to the string to perform the CRC calculation on.

// RETURNS: CRC word, 00000 to 65535.

// NOTES: The CRC calculation used by all Dynatronix units.

/////////////////////////////////////////////////////////////////////////////

uint16_t CRC_Calc (char * szData)

{

uint16_t uiCRC = 0xFFFF;

int16_t iCount = (int16_t)strlen(szData);

int16_t iIndex;

char cShiftCnt;

for(iIndex = 0; iIndex < iCount; iIndex ++)

{

cShiftCnt = 8;

uiCRC = (uint16_t)(uiCRC ^ (szData[iIndex] & 0xFF));

while (cShiftCnt != 0)

{

if ((uiCRC & 0x0001) == 0x0001)

{

uiCRC = (uint16_t)((uiCRC >> 1) ^ (uint16_t)0xA001);

}

else

{

uiCRC = (uint16_t)(uiCRC >> 1);

}

cShiftCnt--;

}

return uiCRC;

} //CRC_Calc

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Dynatronix LT1200X SERIES Specifications Page 102