Original question:
TMS320F28P650DK: How the MCAN recovers from a CAN bus off status
Tool/software:
After monitoring Bus Off status, i am trying to reset MCAN module (through DL_MCAN_init), and I understood thanks to forum (TMS320F28P650DK: How the MCAN recovers from a CAN bus off status - C2000 microcontrollers forum - C2000
︎ microcontrollers - TI E2E support forums) that i should clear Tx buffer status with DL_MCAN_txBufCancellationReq, could you please provide me some example for using it ? It seems I can recover but not at each Bus Off occurence
Please refer to MCAN demo here:
mcan_application_LP_MSPM0G3507_nortos_ticlang.zip
Test result:
This test result is not from this demo, but you can refer to this test result:
Demo enables CAN bus off status changes interrupt: BO
And will detect Bus off status register in CAN BO interrupt:
DL_MCAN_getProtocolStatus(MCAN0_INST, &gProtStatus);
Then in main loop, CPU will restart CAN when
if(CANBusOff == 1)
and set debug pin to high during the MCAN restart.
Test result:
ID from 0x00 to 0x06 is send successfully, total 8 frames.
ID from 0x07 to 0x0C is failed to send, due to CANH and CANL is shorted.
Total 5 frames is failed to send and CPU try to restart CAN 6 times.
You can see busoff pin toggle 6 times, the last one restart CAN successfully.
void MCAN0_Restart(void)
Then after release CANH and CANL’s shorted, CPU run CAN restart successfully.
ID from 0x0D to 0x11 are successfully receive by CAN analyzer, total 5 frames.
