IMP to camera connections

I’m trying to set up the Electric IMP to the Adafruit TTL Camera based on this Github example. How should the IMP and the camera be connected here? I tried just hooking up UART and it doesn’t work. Any suggestions?

I believe the example code uses SPI. This is not very easily available on the adafruit module, but is easy to get at on the radioshack version of that camera module.