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Open topic with navigation CAPL Functions » General » Function Overview » Crc_CalculateCRC8H2F

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Crc_CalculateCRC8H2F

Valid for: CANoe DE • CANoe:lite DE • CANoe4SW DE • CANoe4SW:lite DE

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Function Syntax

long Crc_CalculateCRC8H2F (byte data[], dword dataSize, dword dataOffset, dword crcLength, dword crcStartValue, dword firstCall, dword& crcCalculated);

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Description

Calculates the corresponding checksum for CRC8H2F based on the data. The calculation of the CRC value corresponds to AUTOSAR Profile 2.

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Parameters

  • data: Payload data for which the checksum is to be calculated.
  • dataSize: Length of data block to be calculated in bytes.
  • dataOffset: Start index for the calculation of the CRC in the payload data.
  • crcLength: The length of the data for the CRC is calculated.
  • crcStartValue: CRC initial value depending on whether it is the first call or a subsequent call. Value is ignored if firstCall is 1.
  • firstCall: Flag for first call or a subsequent call. Possible values are 0 (subsequent call) or 1 (first call).
  • crcCalculated: Calculated CRC8H2F value.

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Return Values

  • 0: Successful
  • -1: Not successful: CRC length must not be 0
  • -2: Not successful: Offset must not be greater or equal length
  • -3: Not successful: Length outside array range
  • -4: Not successful: Summary of Length and offset are outside array range

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Example

on key '2'
{
  // Example from AUTOSAR_PRS_E2EProtocol.pdf
  //
  // E2E Protocol Specification
  // AUTOSAR FO R20-11
  // Table 6.28: E2E Profile 2 example protect result

  long  result;
  dword calculatedCRC;
  byte  seq;
  dword dataLength;
  long res;
  byte  data[8] = {
  // CRC| Payload
  0x1B  ,0x01,0x00,0x00,0x00,0x00,0x00,0x00
  };
  byte dataIDs[16] = { 0x01, 0x02, 0x03, 0x04,0x05, 0x06, 0x07, 0x08,0x09, 0x0a, 0x0b, 0x0c,0x0d, 0x0e, 0x0f, 0x10 };  dataLength = elcount(data);

  seq = data[1] & 0x0F;
  res = Crc_CalculateCRC8H2F( data   , dataLength, 1  , dataLength-1,  0xFF, 1, calculatedCRC );
  res = Crc_CalculateCRC8H2F( dataIDs, 16        , seq,          1,  calculatedCRC, 0, calculatedCRC );

  write( "calculatedCRC=0x%X (expect0x1B)", calculatedCRC );
}