Interfacing ARM and AD8403(Digital Potentiometer)

Dear sir/mam,

        As i am working interfacing ARM and AD8403 IC(digital potentiometer),i am measure resistance value,what i am doing is from ARM i am sending data through SPI every 20sec data i am tranmitting,and AD8403 IC what i am sending it will give the exact resistance value.the problem is resistance value is fluctuation,it should not fluctuate,i need your help regarding this i will update my developed code please have a look at it.

 

 

emergency please help me.....

interfacingARMSPIandAD8403.txt.zip
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