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TMS570LC4357: Programmatically changing the CAN MessageID for Transmission

Joe Cassara
Prodigy 110 points

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

I need to be able to change the Message ID of a CAN transmission at runtime, and I'm having difficulty understanding how to use CanUpdateID() to accomplish this. Furthermore, I'm reading conflicting information about the need to reset MsgVal -- which I'm not even sure how to do, if it's even truly required for TRANSMISSION. 

Q: What are the precise steps, using HalCoGen's generated functions, to change a messagebox's MsgID from one value to another?

Example: I'd like mailbox 17's MsgID to change from 0x084F300D to 0x084F3015 and also 0x084F310D.

  • 0
    TI__Guru**** 200246 points

    Hi Joe,

    If you want to change the MsgID of a mailbox which is used for transmitting message, you can use the HalCOGen function: CanUpdateID().

    If you want to change the MsgID of a mailbox which is used for receiving message, you have to clear the MsgVal before calling the HALCoGen function: CanUpdateID().

  • 0 in reply to QJ Wang
    Prodigy 110 points

    Looking at the issue with fresh eyes, I realize I wasn't setting bits 30, 29, and 0 appropriately. Thank you for verifying that I didn't need to reset MsgVal.