Hi @neo2,
From the SDK LPSPI project readme.txt, you also can know:
Board settings
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Remove 0Ω resistors R404,R406,R408.
You need to Remove 0Ω resistors R404,R406,R408, and use two boards one as master and another as slave to test the spi code. remove the resistors, it will remove the LPSPI pins to connect to other modules.
Wish it helps you!
If you still have questions about it.
Best Regards,
kerry