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162

Checking Key Buffer Content

Checks if a key code or coordinates are in the buffer. If either is present, the key code or coordinates

will be returned. The buffer remains uncleared. Use the KEY_Read function to load the data.

However, the coordinates will not be returned if the coordinates input mode is set to “disable”.

SYNTAX

int KEY_Scan(unsigned int *Keycode, POSITION Position);

INPUT

Keycode = Pointer to the area in which the read key code is stored

Position = Pointer to the KDC_POSINFO structure in which the read coordinates

are stored

typedef struct{

int status; /*status

*0 : DOWN_STATUS

*1 : RUN_STATUS

*2 : UP_STATUS

*3 : CANSEL_STATUS

This status arises when the power is off after the down status is

acquired and before the up status is acquired.

int xpos; /* X coordinate */

int ypos; /* Y coordinate */

}KDC_POSINFO;

OUTPUT

= KDC_NONE (0) No data

= KDC_KEYCODE (1) A key code is present.

= KDC_POSDATA (2) Coordinates are present.

EXAMPLE

#include "padlib.h"

unsigned int Keycode;

POSITION Position;

int retcode;

retcode = KEY_Scan(&Keycode,&Position);

Refer to “KEY_Read” also.

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Casio IT-2000D Manual do Utilizador Página 162