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TMS320F28075: Abort pending CAN TX Request immediately

Stefan W
Intellectual 280 points
Part Number: TMS320F28075

Hi,

I need to implement an algorithm to abort a pending CAN TX Request, if it was not started within a certain period. I've disabled the auto retransmission mode, so I take a look at TxRqst. If this is set, I try to abort.

Now my problem is how to abort. I tried various strategies like clearing TxRqst or MsgVal in the interface registers and writing the mailbox number to trigger a transfer. No luck.

So, how can I abort a pending CAN TX Request in DAR-mode?

Best regards,

Stefan

  • 0
    TI__Expert 8950 points
    Stefan,

    Please be sure the Control or Arb bit in the IFnCMD register is set when you write the mailbox number. Otherwise, the TxRqst or MsgVal bit won't actually get updated.
  • 0 in reply to Adam Haun
    Intellectual 280 points
    Hi Adam,

    thanks for your reply. I checked that and Control and Arb are set. After studying the datasheet once more I found my mistake. There are two TxRqst-bits, but to abort I only reset one and the other was still set.
    Now I am using only the TxRqst-bit in the CMD-register (for sending and aborting) and the bit in the MCTL register is initialized unset and never changed.