Hi @nathanmeyer
Thank you so much for reaching us in our community.
Regarding your issue, I would like to suggest to use our SDK examples for MCUXpresso IDE where you can find several examples on how to use SPI, and my recommendation is to check your LCD display slave address so it can communicate well with your MK50 board.
Please let me know if you have more questions.
Best Regards.
Pablo Avalos.