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AD7877-the S/W pointer is appearing away from point of cotact coordinates on touch panel?


We are interfacing i.MX6SL EVK board to AD7877 touch screen controller and are using 3.5 inch Screen touch Panel. Touch panel x-axis size is 76mm and y-axis size is 61mm.

While touching on the panel the pointer(S/W pointer) is appearing 2-3mm away from the point of contact.

We would like to know, whether this is a S/W issue Or is it H/W issue (related to the calibration of Ad7877)?

Pls give your inputs