TouchClock : Design your own GLCD Clock

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This is how the library reads the X raw coordinate of a touch  :
X+ and X- are in high Z : RA0 and RA2 are inputs
Y+ is set to +5V : RA3 is output high
Y- is set to 0V : RA1 is output low
X+ voltage is read by ADC
Y+ is set to 0V : RA3 is output low
Y- is set to 5V: RA1 is output high
X- voltage is read by ADC and averaged with X+ value, the result is the raw X
coordinate.
The same is then done to read the Y coordinate, please see TSlib.c file in .ZIP file
above.
X and Y raw coordinates are then adjusted using calibration coordinates to get X and
Y coordinates in pixel.