6.3Touch Panel Control Function

The keyboard controller has incorporated a program for acquiring the touch coordinates of the touch panel. This program compensates these acquired coordinates with the values obtained through calibration so that correct coordinate values can be calculated. The calculated coordinates will be passed to a ROM-resident program called PEN BIOS when mouse interrupt occurs.

The following diagram shows an operational flow until the coordinates acquired by the keyboard controller are passed to the application program as a mouse event.

Touch Panel

Keyboard

IRQ12 and P260

 

 

ROM BIOS

 

Controller

(Coordinate)

 

 

 

Mouse Event

User Program

 

PENMOUSE.DRV

MS-Windows

Fig. 6.4

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Casio IT-2000W manual Touch Panel Control Function, ROM Bios