AM3356: Data loss in AM3356 DCAN transmission

Data loss here refers to the loss of frames on the bus, and there are no error frames, the lost moment captured the mailbox status bit is idle.

Thanks and tributes.

Hello Zhèngzhòng lú (Translated in google- sorry if wrong)

Thank you for the query.

Is this on a custom board.

How many boards have you verified.

Have you confirmed there is no hardware issue on those boards ?

Regards,

Sreenivasa

Hello,Kallikuppa Sreenivasa:

I confirm that there is no problem with the hardware. DCAN transmission of two channels is used. Data loss will occur when the transmission cycle of two channels is less than 500us accurately. The TXRQ bit is also reset when the request is transmitted.

Hello Zhèngzhòng lú (Translated in google- sorry if wrong)

Thank you for the query.

Is this error occurring on a specificboard. How many boards have you verified?

Data loss will occur when the transmission cycle of two channels is less than 500us accurately.

Please elaborate.

Regards,

Sreenivasa

Hello,Kallikuppa Sreenivasa：

I verified that both boards have such a phenomenon, data transmission is carried out through IF1, data reception uses IF2, there are two channels can request data transmission, when the interval between the two channel requests is below 500us, the data will be lost at a high frequency, is it due to the request frequency is too high, IF1 is too busy? Why is this happening?

Thanks.

Hello Zhèngzhòng lú (Translated in google- sorry if wrong)

when the interval between the two channel requests is below 500us, the data will be lost at a high frequency

How about delay above 500us - Do you see errors.

Regards,

Sreenivasa

Hello,Kallikuppa Sreenivasa：

There will be no error if you delay more than 500us, but our program will have problems, so this is not allowed. We are at a loss about the occurrence of this error. According to the method of the manual, no problem was found. The error register showed no error, but no data was observed on the bus, and the automatic resend function was not turned off. We observed that the TXRQ register had been set when the data was lost, but we waited for a period of time and no data was observed.

Thanks.

Hello Zhèngzhòng lú (Translated in google- sorry if wrong)

Zhengzhong Lu said:

There will be no error if you delay more than 500us, but our program will have problems,

Do you have any other product having similar requirement, using the Am335X and working?

Can you please brief the development environment you are using for me to reach out or assign to the expert.

Regards,

Sreenivasa

Hello,Kallikuppa Sreenivasa：

The problem has been solved, but the cause of the problem is still unclear. We find that without changing the sending function, the transmission with ID 0x583 and data length of 8 bytes will be interrupted by the message with ID 0x703 and data length of 1 byte. When the related message of 0x703 is closed, the transmission will be normal.

Thanks.

Hello Zhèngzhòng lú (Translated in google- sorry if wrong)

Thank you for the inputs and good to hear that the issues has been resolved.

I assume this is a system level analysis customer is doing.

I will close the thread if you do not have any additional questions.

Regards,

Sreenivasa

Hello,Kallikuppa Sreenivasa：

Thank you for your attention and help, you can close the thread.

Thank you.