S32K1XX Encrypted FlexCAN example sends continuos data

[florian_bayer]

Hello,

I have problems with the startup of the CAN bus on the Evalboard S32K116EVB. To test the FlexCAN I modified the example "FlexCAN Encrypted" so that cyclically every 500 ms a message is sent over the bus. Attached is the modified project.

As soon as I send a message the message is repeated several times in an endless loop, although e.g. the controller hangs in a breakpoint, see the following screenshot of the Logic Analyzer.

Within the example I have also checked via the function "FLEXCAN_DRV_GetErrorStatus" what the status of the driver is. Here among other things the following bits are set:

• Bit 1 -> Error Interrupt
• Bit 4 -> Error Passive
• Bit 8 -> Rx Error Warning
• Bit 9 -> Tx Error Warning

The bus is terminated on both sides with a 120 Ohm resistor. On the side of the EVB the resistor is already embedded on the EVB.

I don't know why this occurring, maybe someone can help me on this.

Best Regards,

Florian

[danielmartynek]

Hi @florian_bayer,

Is the message acknowledged by another node on the bus?

Thank you,

BR, Daniel

[florian_bayer]

Hello @danielmartynek 

there is no other node on the bus to acknowledge the message. In my first setup i just wanted to operate it with a standalone message.

Best Regards,

Florian

[danielmartynek · Accepted solution]

Hello Florian,

Please refer to:

Bosch Controller Area Network (CAN) Version 2.0 PROTOCOL STANDARD

https://www.nxp.com/docs/en/reference-manual/BCANPSV2.pdf

Regards,

Daniel

[florian_bayer]

Hello @danielmartynek ,

that was one stupid question from my side. Thank you for your help or your reminder regarding my issue.

Thanks,

Florian