Hi @zhangzhixing
To better understand the SPI communication using DMA, an example project named "Spi_Transfer_S32K396" is provided with the RTD 5.0.0 package. This example demonstrates how to configure and use SPI with DMA through the MCAL drivers.
Additionally, you may find it helpful to refer to the following community thread, which includes examples for the S32K344 device. While this is a different MCU from the one you are using, the implementation is quite similar and could serve as a useful reference.
Example S32K344 SPI Transmit & Receive Using DMA DS3.5 RTD500
BR, VaneB
