Hi @ChenPeng3
The functions implemented at the SDK for LPSPI do not have "native support" for 3-wire. So it required to make some changes to support half duplex mode. Also, check the following thread. It has information related to the topic that might be useful.
S32K 3-Wire SPI Drivers
Additionally, included with the Real-Time Drivers for S32K1 examples of SPI half duplex transfer are provided.
B.R.
VaneB