NXP LPSPI Configuration S32K344 EVB

[rakYps21]

Hi team,

I am currently working on LPSPI communication on the S32K344 EVK using NXP RTD 4.0.0.

I have completed the required configuration for LPSPI and am trying to develop an SPI loopback communication on the EVK.
However, I am currently facing an issue where the data is being transmitted, but I am not receiving the expected data in the RX buffer.

I have attached the following for your reference:

• Project source code
• Relevant configuration details

Could you please go through the attached project and configuration and help me identify the issue?

Specifically, I would appreciate your support in checking:

• LPSPI master/slave configuration
• LPSPI pin configuration and signal routing
• TX/RX buffer configuration
• API usage for LPSPI transmit and receive

Any additional configuration required for loopback communication on the S32K344 EVK

Please let me know if any additional information or logs are required from my side.

Thanks,

Raky

[VaneB]

Hi @rakYps21 

I reviewed your code and configuration, and I could not find any issues. I also flashed the project onto an FRDM-A-S32K344 board, and as shown in the screenshots below, the RX buffers on both the master and slave sides contain the expected data for both transmissions. 

I understand that you are using an S32K3x4EVB board. Could you please let me know which specific EVB variant you are using?

Also, if possible, could you share a picture of the MCU on your board? I would like to check the device marking and mask set. 

BR, VaneB

[rakYps21]

Hi @VaneB,

Thank you for your acknowledgment and for testing the setup from your end.

I am currently using the FRDM Automotive S32K344MINI-EVB board HDQFP172 MCU.

I have also shared an image of the MCU mounted on the board for your reference.
Kindly check and confirm.

Please let me know if you need any additional information from my side.

Regards,

Raky

[VaneB]

Hi @rakYps21 

Thank you for sharing the image.

It looks like we are using a very similar setup. To make sure both setups are aligned, could you please double-check that your SPI signals on your setup are connected as shown below and match the pin assignments specified in the FRDM-A-S32K344 Rev. A schematic?

[rakYps21]

Hi @VaneB ,

I have double-checked the SPI signal connections and pin assignments on my setup, and they are configured as specified in the FRDM-A-S32K344.

Everything matches the configuration you mentioned.
Looking forward to your response and further guidance on the issue.

Best regards,
Raky

[rakYps21]

@VaneB  Also, could you please share images of your setup and the physical connections for reference?

Looking forward to your response and further guidance on the issue.

BR,

Raky

[VaneB · Accepted solution]

Hi @rakYps21 

The connections were a little difficult to distinguish in the photo, so I have marked them on the FRDM-A-S32K344 image below using different colors for clarity: brown for CLK, red for PCS, orange for MOSI, and yellow for MISO.

I am also attaching the captured signals so you can verify that the SPI communication is working as expected.

[rakYps21]

@VaneB Thank you so much for your support.
It is working as expected now.

Does LPSPI support internal Loopback for this FRDM-A-S32K344 EVB ?