Endpoint Domino - 40 Pin connector

I’m having some trouble decyphering the pinout on EP-Domino24:

What do DCMI and SAI stand for?

Digital camera m? Interface

Serial audio interface

Oh boy. I was hoping one was an SPI bus. Is there an SPI bus on the 40-pin connector?

Why do you need SPI on 40-pin connector? I am just curious.

To communicate with my Stepper drivers. Seems I didn’t fully understand the 40-pin header before making my sandwich. Going to have to use the Mikroe bus port then?