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AWR1843AOPEVM: Query on CAN Communication Behavior with Medium Range Radar over Sbus

mitesh rajpurohit
Intellectual 350 points
Part Number: AWR1843AOPEVM

Tool/software:

Hello TI Team,

I am working with the Medium Range Radar and receiving data on the classic CAN frame via the Sbus CAN interface at a baud rate of 500 kbps. The radar continuously transmits messages without any issue.

However, when I try to send a message on the CAN bus through Sbus, the radar stops transmitting its messages. In this setup, only the radar and the Sbus system are connected—no other devices are present on the bus.

Since I am relatively new to CAN protocols, I would appreciate your guidance on this issue. Specifically, could you please advise where modifications may be needed so that the radar continues transmitting even when I send a message on the CAN bus?

Thank you for your support.

Environment:
Hardware :AWR1843AOPEVM
mmwave_sdk_03_06_02_00-LTS

Thanks
Mitesh 

  • 0
    TI__Guru*** 149164 points

    Hi,

    Unfortunately our team does not have much experience with CAN. The CAN IP is standard, not specific to TI devices. Our customers are usually experts on CAN and would not require much support to implement their applications.

  • 0 in reply to Cesar
    Intellectual 350 points

    Hello Cesar,

    Let me clarify the problem in detail.

    I am working with the Medium Range Radar (MRR) application on the AWR1843AOPEVM, which is connected to my application controller on the CAN.

    • When only the radar is transmitting, the CAN frames are sent correctly on the bus.

    • However, once another node (e.g., the controller) transmits a CAN message, the radar stops transmitting and appears to hold the CAN line low.

    To confirm, I tested the radar without my controller with the SBus CAN tool (CAN analyzer). The radar transmits messages correctly when operating alone. But the moment I send a message from the SBus CAN tool, the radar stops transmitting on the bus.

    This behavior suggests a software-related issue originating from the MRR application. 


    under normal conditions, the radar should continue transmitting even if another node is active on the bus.

    Could you please discuss this issue with your software team and help investigate the root cause?

    Thanks and regards,
    Mitesh

  • 0 in reply to mitesh rajpurohit
    TI__Guru*** 149164 points

    Yes,

    The MRR code is a very basic example that shows how to send the object data over CAN-FD. It is provided as starterware to customers to update for their needs.

    It does not support and was not validated with other CAN nodes. There are probably sw updates required to support other nodes

    Thank you
    Cesar