Interfacing AT91RM9200 with an ADC AD7715

hiii every one…

I am struck up at one satge wid my project. My proj is to interface an ADC to an ARM processor AT91RM9200. I need the code for doing this. Can someone provide me wid this urgently.

Can i use the SPI interfacing or the Two-wire interfacing of the processor?

Please do reply me urgently

Thanq