OMAP L138 LCDK SPI example code documentation?

Hi!

I am learning how to use the L138 LCDK. I would like to modify the PDK CSL SPI example code to change its functionality, but I am having difficulty locating the documentation that explains interfacing with the L138 in the C environment. For reference, I was able to successfully build and push the example code to the L138 through an emulator. Now I am looking to modify the functionality of that code, but I am not having success because I do now know what intrinsic objects and functions are available to me.

Is there a documentation or tutorial that I may have missed?

Thanks!
Miron