CAN FD bus off state S32k146

[12914A]

Hi,

We need to implement a CAN FD communication with 1Mb/s as bitrate.
Unfortunately it's not working. The data would be written correct in the RAM, but in Canoe there is no message incomming. I've attached the ESR1, the CAN_init and a function to send a message.

Hope you can help me.

Sandra

[PetrS]

Hi,

seems you are detecting bit errors during transmission which leads to entering bus off state and recovering and so on. A cause of bit error detection can be various, most often inactive CAN transceiver, incorrect bit rate setting, etc. 
It would be great to measure TX/RX and CAN line with scope-analyzer to see real signal as well.

For your code, seems you have wrong setting for CBT register. I can recommend to use below tool which helps you with calculation
https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/MPC5xxx-S32Kxx-LPCxxxx-CAN-CAN-FD-bit-timing-cal...

BR, Petr

[12914A · Accepted solution]

Hi Petr,

thx for your reply. We tested the FlexCAN example, but with the same failures.
We detect, that our controller has some issues with the soldering pads.

Best regards

Sandra