高登

2 Points Calibration for Position Decoding

1. LL and UR are the calibration target points of touch panel, the points are setup at

LL = (1/8 screen X, 1/8 screen Y) = ( 256 , 256 ) ADC ;

UR = (7/8 screen X, 7/8 screen Y ) = ( 1791 , 1791 ) ADC

2. During calibration, press on these two target points, the raw data are obtained as

LL ‘and UR’:

LL’ = ( LL_X, LL_Y ) ;

UR’ = ( UR_X, UR_Y )

3. After the calibration, whenever the panel was touched, firmware report the raw data X and Y. Then, the calibrated position X’ and Y’ are calculated with the formulation as follows:

X – LL_X

UR_X – LL_X

X’ = X 1536 + 256

UR_Y – LL_Y

Y – LL_Y

Y’ = X 1536 + 256