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kscan.h
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kscan.h
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// KSCAN definitions for keyboard and joystick
//*********************
// KSCAN related addresses
//*********************
#ifndef KSCAN_H
#define KSCAN_H
// Address to set the scan mode (see KSCAN_MODE_xxx defines)
#define KSCAN_MODE *((volatile unsigned char*)0x8374)
// Address to read back the detected key. 0xFF if no key was pressed.
#define KSCAN_KEY *((volatile unsigned char*)0x8375)
// Address to read back the joystick X axis (scan modes 1 and 2 only)
#define KSCAN_JOYY *((volatile unsigned char*)0x8376)
// Address to read back the joystick Y axis (scan modes 1 and 2 only)
#define KSCAN_JOYX *((volatile unsigned char*)0x8377)
// Address to check the status byte. KSCAN_MASK is set if a key was pressed
#define KSCAN_STATUS *((volatile unsigned char*)0x837c)
#define KSCAN_MASK 0x20
//*********************
// KSCAN modes
//*********************
#define KSCAN_MODE_LAST 0 // last mode scanned
#define KSCAN_MODE_LEFT 1 // left side of keyboard and joystick 1 (fire is a key of 18)
#define KSCAN_MODE_RIGHT 2 // right side of keyboard and joystick 2 (fire is a key of 18)
#define KSCAN_MODE_994 3 // upper-case only, 99/4 compatible results
#define KSCAN_MODE_PASCAL 4 // PASCAL mapping, different control keys
#define KSCAN_MODE_BASIC 5 // Normal 99/4A BASIC mode
//*********************
// Joystick return values
//*********************
#define JOY_LEFT 0xfc
#define JOY_RIGHT 0x04
#define JOY_UP 0x04
#define JOY_DOWN 0xfc
//*********************
// Function definitions
//*********************
// call the console SCAN function, supports all the regular keyboard modes, debounce, joysticks, etc.
// requires console ROM and GROM to be present.
unsigned char kscan(unsigned char mode);
// does a simple read of the keyboard with no shifts and no debounce. Mode 0 is keyboard,
// mode 1 is joystick 1 fire button (only!) and mode 2 is joystick 2 fire button (only!)
// Fire buttons are /not/ aliased to 'Q' and 'Y' on the keyboard. Returns key in KSCAN_KEY,
// no status. Key is 0xff if none pressed.
void kscanfast(int mode);
// read a joystick directly. 'unit' is either 1 or 2 for the joystick desired
// returns data in KSCAN_JOYY and KSCAN_JOYX
void joystfast(int unit);
#endif /* KSCAN_H */