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CAPL Functions » General » Function Overview » Crc_CalculateCRC32P4

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Crc_CalculateCRC32P4

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

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Function Syntax

long Crc_CalculateCRC32P4 (byte data[], dword dataSize, dword dataOffset, dword crcLength, dword crcStartValue, dword firstCall, dword& crcCalculated);

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Description

Calculates the corresponding checksum for CRC32P4 based on the data. The calculation of the CRC value corresponds to AUTOSAR Profile 4.

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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 CRC32P4 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

// first CALL, Offset '0'
on key 'a'
{
  long  retval;
  dword crc;
  byte  data[9] = {0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39};

  retval = Crc_CalculateCRC32P4(data, elcount (data), 0, elcount (data), 0, 1, crc);
  write("CRC of data: 0x%X", crc);
}

// first CALL, Offset '2', Length - 2
on key 'b'
{
  long  retval;
  dword crc;
  byte  data[11] = {0xAA ,0xAA,0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39};

  retval = Crc_CalculateCRC32P4(data, elcount (data), 2, elcount (data) -2, 0, 1, crc);
  write("CRC of data: 0x%X", crc);
}