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J1939FillSHM

Valid for: CANoe DE • CANoe4SW DE

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Function Syntax

long J1939FillSHM(pg pgSDM, byte sequenceNumber, pg* pgSHM);

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Description

This function uses the PGN, addresses, priority and payload of a Safety Data Message (SDM) as well as a sequence number to set the payload, priority and addresses of a Safety Header Message (SHM). The payload of the SDM consist of following signals (see SAE J1939-76):
  • Inverted SDM Data Page.
  • Inverted SDM Extended Data Page.
  • SDG Sequence Number.
  • Inverted SDM Source Address.
  • Inverted SDM PS Value.
  • Inverted SDM PF Value.
  • SDM Data CRC.

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Parameters

  • pgSDM: The data of SDM is used to fill the SHM. DLC of SDM shall be 8.
  • sequenceNumber: New sequence number of the SHM.
  • pgSHM: SHM message to be filled. DLC of SHM shall be 8.

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Return Values

  • 0: SHM is successfully filled.
  • -1: DLC of SDM is not 8 bytes.

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Example

void SendSHM(pg* sdm, byte sequenceNumber)
{
  pg SHM shm;
  long result;
  result = J1939FillSHM(sdm, sequenceNumber, shm);
  if (result < 0)
  {
    write("J1939FillSHM failed with error %i", result);
  }
  else
  {
    output(shm);
  }
}
J1939CalculateCrcOfSDM • J1939ParseSHM