Unable to read via F8379D SPI interface

Hi,

I have connected all the necessary pins for SPI fron F28379D launchpad to CN0276 using J2.

I was not getting any data, I then connected the /CS to gound by replaciong R57 from 10k to 0ohm.

After instead of 0 and I get 0xFF as read values for all resgister.

I have checked the ground connections and the clock & FSYNC signals they work correct. However I see very low pulses of data on SDI and SDO is always high (with some pulses which dont change beyond threshold voltage). 

I am struggling to make this work? Do we need to make any other changes to CN0276 board? do we need to tie VDrive of AD2S1210 to 3.3V of MCU? (if yes, how)

Is there any additinal help material or sample code to try out?

thanks

Sumeet