CAN bus status bus-off state

Hello Vic,

How have you connected the two boards? Is it through a Transceiver or not?

Regards

Amit

Hello Amit

Yes. I connected two boards through a Transceiver

Regards

Vic

Hello Vic,

When the CANINT shows 0x8000, what does the CANSTS register show up?

Regards

Amit

Hello Amit,

When the CANINT shows 0x8000,  the CANSTS is 0xE5

Regards

Vic

Hello Vic

The BUS OFF recovery seems to be in progress. Did you run it long enough to complete bus recovery?

Since you are connecting two TIVA boards, there is an example CAN code that we have tested on TM4C129 device with an external transceiver that has been uploaded to the Forum (some time in August). You can use that code as a reference to weed out any HW issue.

Also it would be good to see what the bus activity looks like using a scope

Regards

Amit

Hello Amit

I download the example CAN code from the forum and use CCS to run it

But it go into IntDefaultHandler (an infinite loop)

cause by the SysCtlDelay(10000000);

could you tell me how to solve it

Regards

Vic

Hello Vic,

Can you please check the startup_ccs.c file to see if the Interrupt Handler for CAN is mapped in the correct position in the vector table?

Regards

Amit

Hello Amit

Thank you so much.

Now Two EK-LM4F120XL boards can do TX and RX correctly

Regards

Vic

Hello Vic,

Great...

Regards

Amit

Hello All,

I am using Tiva board. 

I am having an query regarding Bus Off state.

My CAN Communication works fine and after detecting shorting CANH and CANL, Bus goes to Bus OFF state and on restarting CAN Communication works fine.

But I want my device to restart communication without restarting. As soon  as CANH and CANL short is removed CAN Communication to be restarted. CAN Anyone help me out here please.

Thanks,

Mitesh