You can find a software package named LPC812_Example_Code_Bundle_LPCXpresso_r1.00.00 inside your MCUXpresso IDE installation on this path C:\nxp\MCUXpressoIDE_10.1.1_606\ide\Examples\CodeBundles. You can use those drivers as base for your application.
Hope it helps!
Best Regards, Carlos Mendoza Technical Support Engineer