How to send/receive 64bit or longer message using SPI

TaehoLee — Mon, 20 Jun 2022 07:59:45 GMT

Hello,

Currently, I have to implement to send/receive 64bit(4*16bits) and longer SPI messages using S32K144.

I'm using S32K144 EVB and S32 Design Studio for ARM 2.2

With the LPSPI example code in S32 Design Studio, I tested 64bit SPI transfer

But, I didn't work properly.

I changed CONT register to "True", after then if 4 messages were transferred

Also, I changed CONT register to "False"

But, the result was different from my expectation.

So, I have several questions about the SPI implementation

1. How to send/receive 64bit(2Byte * 4) SPI messages

Which registers also have to be modified from the initial SPI example code?

2. How to send/receive 12Bytes(2Bytes*6) and 168Bytes(2Bytes*84) SPI messages also

Which kinds of things have to be modified together

3. How to observe SPI FIFO values?

I heard the 4 FIFO buffer included in S32K144, Can I observe and monitor the FIFO buffer data?

Due to the security policy of our company, I couldn't attach screenshot

If you need screenshot please let me know your e-mail

Thank you.

Re: How to send/receive 64bit or longer message using SPI

Robin_Shen — Mon, 20 Jun 2022 08:41:16 GMT

Hi TaehoLee,

Seems that you are refer S32K144_Project_LPSPI bare metal example. Then you can refer: AN5320 Using LPSPI on KL28Z

If you want to use the S32 SDK, please read the S32SDK_S32K144_UserManual.(C:\NXP\S32DS_ARM_v2.2\S32DS\software\S32SDK_S32K1xx_RTM_3.0.0\doc\S32SDK_S32K144_UserManual.pdf)

lpspi_dma_s32k144 and lpspi_transfer_s32k144 can be found in S32SDK S32K1xx RTM.

Best Regards,
Robin
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How to send/receive 64bit or longer message using SPI

Re: How to send/receive 64bit or longer message using SPI