AM62A7: CANalyzer Detects Extra Data on CAN Bus

Hi Kevin,

Is the customer using AUTOSAR? Which MCU+SDK example are they using as the reference?

Best Regards,

Meet.

Hi Meet,

Customer is running the following demo on SDK10.1, no Autosar. Customer disabled the loopback, and added a while loop to send CAN packet every second.

https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/10_01_00_33/exports/docs/api_guide_am62ax/EXAMPLES_DRIVERS_MCAN_LOOPBACK_INTERRUPT.html

Thanks,

Kevin

Hi Kevin,

The customer seems to be using EB Tresos tool with the MCU+SDK, could you please confirm if they are using MCAL SDK.

Kevin Peng said:

the configuration of MCAN demo is the same as default with no changes.

The example by default configures arbitration bit rate at 1Mbps and data bit rate at 5Mbps, in your screenshot I see them configured at 500kbps and 2Mbps, could you please ask them to check the same.

Best Regards,

Meet.

Hi Meet,

We are using MCAL demo and disabled the loopback.

Meet Thakar said:

The example by default configures arbitration bit rate at 1Mbps and data bit rate at 5Mbps

But the code of the example by default seems to be as below:

It's the same as we configured in CANalyzer.

Hi Zichao,

zhichao lu said:

But the code of the example by default seems to be as below:

Apologies for the confusion, these default bit rates are for the MCU+SDK example, as Kevin Mentioned you are using an example from MCU+SDK. Based on the Screenshot shared by you for the MCAL demo, your CANanlyzer settings look OK. I am assigning this thread to another expert who can help you out on MCAL, please wait for their response.

Best Regards,

Meet.

Hi Nihar, Meet,

Any suggestions you could provide today please?

Thanks,

Kevin

Hi Kevin,

I will provide an update by EOD.

Regards,

Nihar Potturu. 

Hi Nihar,

Still waiting for your suggestions, please help customer to move forward.

Thanks,

Kevin

Hello Kevin,

Kevin Peng said:

The configuration of CANalyzer is shown below, and the configuration of MCAN demo is the same as default with no changes.

The sampling point calculation in the data phase looks incorrect. That should also be configured to 80%. Can you ask the customer to update it to 80 and recheck.

They can refer to the below FAQ for more information on sampling points calculation:

 [FAQ] TDA4VM: CAN: How is bit-rate calculated for CAN 

Regards,

Nihar Potturu. 

Hi Nihar,

Customer has tried modified the sampling point calculation to 80% shown below, but the problem still exists.

Customer also feedback that if there is indeed some sampling point configuration problem, it may not explain why there are extra data detected on the CAN Bus, it may only result some frame loss.

Do you agree this point? And what will be the next step to debug?

Thanks,

Kevin

Hi Nihar,

Could you help check if there is anything else needed to correct in customer's updated configuration above please?

Thanks,

Kevin

Hi Kevin,

Could you please share the code snippet added by the customer in the MCAN demo, I suspect there could be some issue with the way the message is being transmitted. Also please confirm if they are using interrupt mode or polling mode for transmission?

Best Regards.

Meet.