short two GPIO Pin to simulate short defect. but it doesn't work.

[wangyuanfan]

Hi ! I'm experimenting with CY8CKIT-149.

I'm using  CSD sensing method or CSX  sensing method to measure the capacitance value on touchpad.

I shorted two GPIO Pin to simulate short defect. In this case, the two shorted GPIO Pins theoretically indicate double the normal value.

But, it was observed 40 times as large as the normal value and constant at 84537 fF measured by the function CapSense_GetSensorCapacitance().

I don't know how to observe the double value.

Please help me.