The SPI SIMO and CLK pins should have values at the pins even though you are not reading the SOMI data using SPI Receive. Please check on following things
1) Ensure a known program is running on ARM core. You can create a simple model for ARM core and download before downloading the SPI model to c28x core.
2) Ensure the download goes through properly without any warnings or errors.
3) Are you using the ControlCard? Ensure the pins numbers you are checking are proper and corresponds to the GPIO number by checking the pinmap. For example, pins on the Docking station 67, 69, 71, 73 corresponds to GPIO16, 17, 18, 19.
4) If you want to debug in CCS. Use the project created after code generation to launch the CCS project directly and build in CCS (attached the image for reference). It will take care of all the dependencies required for the build including the shipped files like MW_SPI.h.
Let us know if further help is needed.