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CCS/LAUNCHXL-F28379D: LAUNCHXL-F28379D How to use two CanBus at the same time in Simulink?

user5314827
Prodigy 20 points
Part Number: LAUNCHXL-F28379D

Tool/software: Code Composer Studio

Hi

I can see the 'Two Controller Area Network (CAN) Modules' from datasheet.

I can use CanBus on the development board J12.(set GPIO 12 17 in eCAN_B) Baud rate is 500kbps.

But I can not use eCAN_A.(set  GPIO 31 30) Baud rate is 500kbps.

This is my external circuit. (the IC used is MCP2562.)  

And this is my Simulink block.

Does anyone have a solution? Thank you.

  • 0
    TI__Guru 53755 points

    Hello, we've contacted Mathworks about your post. Someone from their support team should reply soon.

    Whitney

  • 0
    Mastermind 9005 points

    Does the CAN work via CCS example on pins 31 & 30? Can you verify the HW setup works correctly for those pins?

    Thanks,

    -Brian

  • 0 in reply to Brian McKay
    Prodigy 20 points

    Hi Brian

    Thank you for your reply.

    Currently, I measured the eCAN_B (GPIO 12 17) using a digital storage oscilloscope.

    This is the signal I measured.( GPIO 12 17 )

    This is the pin position I measured.

    After that, I measured the eCAN_A (GPIO 3 4 , 19 18 ) using a digital storage oscilloscope.

    This is the signal I measured. All signals are high level !! I think it is not turned on the CanBus function.

    This is the pin position I measured.

    This is all my settings. I can't find other settings about CanBus.

    The conclusion is that I can't find other settings to enable eCAN_A to turn on the GPIO (4 5 or 19 18) .

    I hope you can help me find a solution, or we can communicate directly online.

    Thank for your assistance.

    -Roy

  • 0 in reply to user5314827
    Mastermind 6460 points

    Hi,

    The reason we don't see signal on other GPIO pins is because they are not connected to SN65HVD23x CAN Transceivers.

    This component will generate the CAN Bus signal CAN-H and CAN-L. In the Absence of the Transceivers this conversion does not happen and we cannot view the CAN signals.