topic S32K144EVB CAN Features in S32K

S32K144EVB CAN Features

johns_chuang — Fri, 24 Apr 2020 01:32:28 GMT

The development environment is S32DS for ARM 2018.R1.

I use the attached program to run on EVB.

CAN communication can operate,

But I want to use TJA 1043 instead of MCZ33903CS5EK on EVB,

So I connected RX (PTE4) / TX (PTE3) of S32K144 to RX / TX of TJA 1043,

TJA 1043 did not work,

But I can use TJA 1043 with other MCU, his CAN function is working.

And whenever I unplug the two signal lines of CAN-L / CAN-H of EVB, the RX / TX of S32K144 will not have any output signal.

So I'm stuck here, I don't know how to use S32K144EVB to control TJA1043 to output the signal I want ...

Please can someone help me to see what I am missing?

Thank you for your patience to read my question.

Re: S32K144EVB CAN Features

Robin_Shen — Mon, 27 Apr 2020 02:11:07 GMT

Hi Carter Johns,

Would you please check the SCH version of your S32K144EVB?
The version of my S32K144EVB is Rev B, the schematic shows that the SBC_CAN_TX is connect on PTE5.(not PTE3)

Best Regards,

Robin

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Re: S32K144EVB CAN Features

johns_chuang — Tue, 28 Apr 2020 06:11:29 GMT

Hi Robin

You are right！Sorry, I wrote it wrong:smileysilly:

I actually mean PTE5 and PTE4,

Thanks for your correction.

So ... Do you have any suggestions for EVB not to use UJA1169, but to use TJA 1043?:smileyconfused:

Thank you for your time,

Carter

Re: S32K144EVB CAN Features

Robin_Shen — Tue, 28 Apr 2020 08:53:05 GMT

Hi Carter,

Have you refer the can_pal_s32k144 example? Only after press SW2 and SW3 button of board, it will trigger a CAN transfer.

You should be able to see signal on PTE5 by using oscilloscope.
Please first make sure there are signal on it pin.

Best Regards,

Robin

Re: S32K144EVB CAN Features

johns_chuang — Tue, 28 Apr 2020 09:21:41 GMT

Hi Robin

Thank you for replying so quickly:smileyhappy:

Yes, My program uses this example...

I can control the CAN with UJA1169 on EVB, RX signal can be seen on an oscilloscope.

But I want to use another CAN IC, Like TJA1043 to send CAN signal.

Whenever I remove the CAN Communication Bus on the EVB, there is no signal from PTE5 / PTE4,

Why? Why? Why?:smileycry:

Re: S32K144EVB CAN Features

Robin_Shen — Wed, 29 Apr 2020 07:17:04 GMT

Please check the "Table 8. Static characteristics" of TJA1043.pdf. Make sure the voltage of PTE5(SBC_CAN_TX) and PTE4(SBC_CAN_RX) meet this characteristics.

Would you please let me know if you configured the TJA1043 in Normal mode(STB_N=high EN=high)?

I don't have oscilloscope on my hand today, but I can measure the waveform of PTE5(SBC_CAN_TX) tomorrow.

Re: S32K144EVB CAN Features

johns_chuang — Wed, 29 Apr 2020 08:25:52 GMT

Hi Robin

Thanks for your assistance,

I know what my problem is！

1. EVB removes 12V power supply
2. Change J107 to 2/3 pin, USB power supply
3. Cancel CAN FD setting in Processor Expert.

So I can use TJA1043 to send CAN signal. :smileyblush:

Thanks again for Robin help~

Re: S32K144EVB CAN Features

Robin_Shen — Thu, 30 Apr 2020 01:13:51 GMT

You are welcome.
I am glad to hear that it works now.