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https://github.com/cc65/cc65.git
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192 lines
3.8 KiB
ArmAsm
192 lines
3.8 KiB
ArmAsm
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;
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; Standard joystick driver for the PCEngine
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;
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; Ullrich von Bassewitz, 2002-12-20
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;
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;;.include "zeropage.inc"
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;;.include "joy-kernel.inc"
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;;.include "joy-error.inc"
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JOY_ERR_OK=0;
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.include "pcengine.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "CODE"
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; Driver signature
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;; .byte $6A, $6F, $79 ; "joy"
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;; .byte $00 ; Driver API version number
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; Button state masks (8 values)
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;extern const unsigned char joy_masks[8];
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.export _joy_masks
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_joy_masks:
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.byte $10 ; JOY_UP
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.byte $40 ; JOY_DOWN
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.byte $80 ; JOY_LEFT
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.byte $20 ; JOY_RIGHT
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.byte $04 ; ? JOY_FIRE
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.byte $02 ; ? Future expansion
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.byte $01 ; ? Future expansion
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.byte $08 ; ? Future expansion
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; Jump table.
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;; .word INSTALL
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;; .word DEINSTALL
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;; .word COUNT
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;; .word READ
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; ------------------------------------------------------------------------
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; Constants
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JOY_COUNT = 4 ; Number of joysticks we support
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; ------------------------------------------------------------------------
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; Data.
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.code
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;extern const char joy_stddrv[];
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.export _joy_stddrv
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_joy_stddrv:
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.byte 0
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.export _joy_load_driver
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.export _joy_unload
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;unsigned char __fastcall__ joy_unload (void);
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;unsigned char __fastcall__ joy_load_driver (const char* driver);
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_joy_load_driver:
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_joy_unload:
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an JOY_ERR_xx code in a/x.
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;
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INSTALL:
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lda #<JOY_ERR_OK
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ldx #>JOY_ERR_OK
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; rts ; Run into DEINSTALL instead
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; ------------------------------------------------------------------------
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; DEINSTALL routine. Is called before the driver is removed from memory.
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; Can do cleanup or whatever. Must not return anything.
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;
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DEINSTALL:
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rts
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; ------------------------------------------------------------------------
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; COUNT: Return the total number of available joysticks in a/x.
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;
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;unsigned char __fastcall__ joy_count (void);
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.export _joy_count
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_joy_count:
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COUNT:
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lda #<JOY_COUNT
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ldx #>JOY_COUNT
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rts
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; ------------------------------------------------------------------------
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; READ: Read a particular joystick passed in A.
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;
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;unsigned char __fastcall__ joy_read (unsigned char joystick);
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.export _joy_read
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_joy_read:
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READ:
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pha
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jsr read_joy
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pla
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tax ; Joystick number into X
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; return value from buffer
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joy1:
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lda padbuffer,x
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ldx #0
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rts
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.code
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read_joy:
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; reset multitap counter
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lda #$01
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sta $1000
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pha
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pla
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nop
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nop
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lda #$03
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sta $1000
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pha
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pla
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nop
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nop
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cly
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nextpad:
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lda #$01
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sta $1000 ; sel = 1
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pha
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pla
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nop
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nop
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lda $1000
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asl a
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asl a
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asl a
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asl a
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sta padbuffer, y ; store new value
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stz $1000
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pha
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pla
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nop
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nop
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lda $1000
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and #$0F
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ora padbuffer, y ; second half of new value
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eor #$FF
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sta padbuffer, y ; store new value
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iny
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cpy #$05
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bcc nextpad
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rts
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.bss
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padbuffer:
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.res 4
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