In SPI slave, the data I set and the actual data to be transmitted are different when 12V power is applied.

[kbj]

Hi,

I use S32K144EVB, S32DS for ARM.2018.R1 and SDK EAR0.8.6.

In LPSPI slave, the data I set and the actual data to be transmitted are different when 12V power is applied.

But the datas are same when usb power is applied.

Please let me know how do I resolve it?

- 12V POWER : The datas are different -

Green : MISO

- USB POWER : The datas are same -

Green : MISO

Thanks and best regards,

Byungju.

[danielmartynek · Accepted solution]

Hi,

Which port do you use?

PTB14-17 are used by the SBC UJA1169 SPI.

And the SBC is powered from the 12V connector. 

So you can have 2 slave devices controlled with one CS.

Regards,

Daniel

[kbj]

Hi Daniel.

You are right.

I change PTB15 -> PTD0. So The problem is not occured.

It seems to be a problem because UJA1169 and other serial devices are connected together.

Thanks for your help.

Best regards,

Byungju.