136 lines
2.0 KiB
ArmAsm
136 lines
2.0 KiB
ArmAsm
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;---------------------------------------------------------------------
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.macpack generic
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.import _ctk_mouse_joyx, _ctk_mouse_joyy
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.import _ctk_mouse_firebutton
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.export _ctk_mouse_joy
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;---------------------------------------------------------------------
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.bss
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lastjoydy: .res 1
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lastjoydx: .res 1
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joydycnt: .res 1
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joydxcnt: .res 1
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;---------------------------------------------------------------------
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.code
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;---------------------------------------------------------------------
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_ctk_mouse_joy:
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ldy $dc02
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lda #0
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sta $dc02
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lda $dc00
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sty $dc02
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ldy #0
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ldx #0
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lsr
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bcs nodey
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dey
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nodey:
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lsr
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bcs noiny
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iny
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noiny:
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lsr
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bcs nodex
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dex
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nodex:
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lsr
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bcs noinx
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inx
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noinx:
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and #1
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eor #1
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ora _ctk_mouse_firebutton
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sta _ctk_mouse_firebutton
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cpy lastjoydy
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sty lastjoydy
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bne noydy
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tya
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pha
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inc joydycnt
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lda joydycnt
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cmp #$1f
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bmi nostajoydycnt
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lda #$20
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sta joydycnt
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nostajoydycnt:
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lsr
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lsr
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lsr
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lsr
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tay
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pla
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asldeyloop:
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asl
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dey
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bpl asldeyloop
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tay
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jmp ydy
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noydy:
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lda #0
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sta joydycnt
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ydy:
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tya
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clc
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adc _ctk_mouse_joyy
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cmp #240
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bcc :+
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lda #0
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:
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cmp #200
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bcc :+
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lda #199
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:
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sta _ctk_mouse_joyy
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cpx lastjoydx
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stx lastjoydx
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bne noxdx
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txa
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pha
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inc joydxcnt
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lda joydxcnt
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cmp #$1f
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bmi nostajoydxcnt
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lda #$20
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sta joydxcnt
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nostajoydxcnt:
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lsr
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lsr
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lsr
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lsr
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tax
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pla
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asldexloop:
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asl
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dex
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bpl asldexloop
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tax
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jmp xdx
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noxdx:
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lda #0
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sta joydxcnt
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xdx:
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txa
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clc
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adc _ctk_mouse_joyx
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sta _ctk_mouse_joyx
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php
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lda #$ff
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cpx #0
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bmi nolda02
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lda #0
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nolda02:
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plp
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adc _ctk_mouse_joyx+1
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sta _ctk_mouse_joyx+1
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rts
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