AD5683 SPI examples

I am using the AD5683 for the first time.  I am also new to SPI.  Are there any code examples for writing over the SPI bus?  Right now I am trying to write a simple test routine that will change the output voltage, wait 1 second and then change to another output voltage.  My output is not responding at all.  I am using the AD5683RACPZ-1RL7.  I have attached a schematic for reference.