TMS320F280025: TMS320F280025C CAN communication error when Tx and Rx are enabled

Jarold Gonzalez

Part Number: TMS320F280025
Other Parts Discussed in Thread: C2000WARE

Hi Joseph,

I'm looking at the same example from the TI C:\ti\c2000\C2000Ware_4_01_00_00\driverlib\f28002x\examples\can\can_ex5_transmit_receive.c, I did small modification to be able to send and receive messages. Mainly I modified the OBJ ID (please see below) and remove the ##ifdef TRANSMIT

#define TX_MSG_OBJ_ID 1

#define RX_MSG_OBJ_ID 2

I'm using a vector case to send a frame at 100ms, with this setup I'm able to send and receive messages, however, I get interrupt errors in both Tx and Rx occasionally. Do you know why this is happening? Do I need to add extra checks before doing the Tx (CAN_sendMessage) ?

Thanks!

over 3 years ago

0 Jarold Gonzalez over 3 years ago

Prodigy 70 points

Hi,

I'm not sure if the information that this question is related to the link below was saved, here is the previous thread that I was trying to refer to.

TMS320F280025: CAN interrutp: Relationship between RxOK and message object number when getting a interrupt - C2000 microcontrollers forum - C2000︎ microcontrollers - TI E2E support forums

Best regards

0 Vince over 3 years ago in reply to Jarold Gonzalez

TI__Mastermind 19795 points

Hi Jarold,

Thanks for the question! It seems a lot like there may be a bus conflict, is it possible for you to take a scope capture of the TX and RX pins during transmit/receive error timing?

I will also contact Joseph who worked on the thread you are referring to.

Regards,

Vince

+1 Vince over 3 years ago in reply to Vince

TI__Mastermind 19795 points

Hi Jarold,

I also have a few additional items to request in addition to the scope capture during error:

Can you try making sure that you ignore both TXOK and RXOK when doing the check? Basically, we don't want to set "errorFlag = 1" when either of these are okay. You should be able modify your if statement as follows to do so:

if(((   status  & ~(CAN_STATUS_TXOK | CAN_STATUS_RXOK)) != CAN_STATUS_LEC_MSK) &&
    ((  status  & ~(CAN_STATUS_TXOK | CAN_STATUS_RXOK)) != CAN_STATUS_LEC_NONE))
{
    //
    // Set a flag to indicate some errors may have occurred.
    //
    errorFlag = 1;
}

Can you provide the CAN_ES register value during failure, for the following two scenarios:
- Failure during transmit
- Failure during receive
- Also please let me know if the errors are the same each time.

Regards,

Vince

C2000™︎ microcontrollers

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TMS320F280025: TMS320F280025C CAN communication error when Tx and Rx are enabled