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AD5758 can't read or use it


I am currently trying to test my first circuit base on the AD5758. I am currently an electronics designer trainee. I have written my code base on the example found in the woboq website (a linux base code). I can see with my oscilloscope the Logic analyser and I can confirm I write by SPI the right data within the timing diagram constraint.

What I am trying to do is read registers, but when I check the NOP, nothing comes out on the SDO line. I really don't understand what is going on and I have check pretty much everything. Can someone help me or give me some insight to what I can check? 

Feel free to ask any informations needed to answer me, I don't really know what more I can say to have help.

Thanks for anyone helping me ! 

A student trying to learn Slight smile