CAN-FD communication fail using TJA1145FD

[chengsz12060]

Hello, NXP support,

Now I am debugging CAN-FD&TJA1145FD using s32k144. The phenomenon is as follows.
S32K144 + CAN-FD + TJA1043
→CAN-FD communication(send/receive) is successful.

S32K144 + CAN + TJA1145FD
→CAN communication(send/receive) is successful.

S32K144 + CAN-FD + TJA1145FD
→CAN communication fails.
→PC CAN Box Tool displays “error frame" in output window.
→TJA1145FD 's TX pin has waveform, but it is different from the waveform of CAN-FD&TJA1043.

<Question>
Why does the communication fail when MCU uses CAN-FD&TJA1145FD ?
Is there any difference in the control method or configuration method of TJA1145FD when MCU uses CAN and CAN-FD?

With Best Regards,

[chengsz12060 · Accepted solution]

I have checked the CFDC of  20h.

CAN-FD comunication fails if CFDC = 0.

CAN-FD communcaiton also fails if CFDC = 1.

20h.png

[Robin_Shen]

Hi chengsz,

Please check the CFDC of CAN control and Transceiver status registers. Here is the Data Sheet of TJA1145.

TJA1145 CFDC.png

Best Regards,
Robin
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