In MC9S12X, stop sending the error frames in CAN Bus-Off state

[Nash_win]

Currently I am using the Auto Bus-Off recovery feature of MSCAN of MC9S12X.

However, the problem with this is that when the Bus-Off occurs, due to the auto-recovery, the uC starts sending the error frames continuously in the Bus-Off state.

If i want to stop the Error frames for certain period, how can i do it?

[lama]

It looks like you are going into the same error after buss off recovery. If the MCU is in the bus off then it does not sends any frames. A bus-off node is not allowed to have any influence on the bus (e.g. output drivers switched off). It looks like you are facing behavior presented in attached files.

What I would like to suggest you is to abort the messages and fix all mistakes:

if (CAN0TFLG != 0x07)

{

  do

    {

      if( !CAN0TFLG_TXE0 )

         {   CAN0TARQ_ABTRQ0 =  1; // abort the transmission

              while ( ! CAN0TAAK_ABTAK0 ) {}

        }

       if( !CAN0TFLG_TXE1 )

          {   CAN0TARQ_ABTRQ1 =  1; // abort the transmission

               while ( ! CAN0TAAK_ABTAK1 ) {}

           }

       if( !CAN0TFLG_TXE2 )

          {   CAN0TARQ_ABTRQ2 =  1; // abort the transmission

               while ( ! CAN0TAAK_ABTAK2 ) {}

          }

    }

while(CAN0TFLG != 7);

}

Best Regards, Ladislav

[howardg]

Ladislav, do you know whether this technique should fail on the KE06?  I tried it,  modified for the different register names, but I'm not consistently getting bus-off interrupts with the KE06's MSCAN peripheral.  After a bus off interrupt and abort I back off for 5 seconds and then try again.  I can do that twice before the KE06/MSCAN gives up and stops generating bus off interrupts.