problem dealing with two CANs

[karlsl]

Hi, I am using MC9S12 MCU for a project which requires receiving messages from two separate CANs from a vehicle. The problem I am having is that one of the CAN interrupt will randomly stop receiving message from the CAN bus. when this happens, I have to restart the program again.

I never have this problem when dealing with receiving from one CAN. I have tried setting one CAN with high priority and another with lower priority but the problem persists. logically, I assume this happens when interrupt from one CAN happens before another CAN has finished processing the message. Is there a way to solve this problem? thanks,

[RadekS]

Hi carl,

Could you please specify your MCU derivative? CAN interrupts are managed by CPU or XGATE?

Which version of CW you use?

Contains your CAN routines any loops which could be potentially infinite?

Did you implement CAN Error Interrupt routines?

I suppose that CANs have independent external transceivers. Could you please check whether new data correctly arrived to MCU pins?

Are you sure that CAN codes do not share any global variable for processing?

I hope it helps you.

Have a great day,
RadekS

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