.include "zeropage.inc"
.include "mouse-kernel.inc"
- .include "c64.inc"
+ .include "c64.inc"
.macpack generic
.byte $6d, $6f, $75 ; "mou"
.byte MOUSE_API_VERSION ; Mouse driver API version number
-; Jump table.
+; Library reference
+
+ .addr $0000
+
+; Jump table
.addr INSTALL
.addr UNINSTALL
;----------------------------------------------------------------------------
; Constants
-SCREEN_HEIGHT = YSIZE * 8 - 1 ; (origin is zero)
+SCREEN_HEIGHT = YSIZE * 8 - 1 ; (origin is zero)
SCREEN_WIDTH = XSIZE * 8 - 1
;----------------------------------------------------------------------------
.bss
Vars:
-OldPotX: .res 1 ; Old hw counter values
-OldPotY: .res 1
+OldPotX: .res 1 ; Old hw counter values
+OldPotY: .res 1
XPos: .res 2 ; Current mouse position, X
YPos: .res 2 ; Current mouse position, Y
-XMin: .res 2 ; X1 value of bounding box
-YMin: .res 2 ; Y1 value of bounding box
-XMax: .res 2 ; X2 value of bounding box
-YMax: .res 2 ; Y2 value of bounding box
-Buttons: .res 1 ; button status bits
+XMin: .res 2 ; X1 value of bounding box
+YMin: .res 2 ; Y1 value of bounding box
+XMax: .res 2 ; X2 value of bounding box
+YMax: .res 2 ; Y2 value of bounding box
+Buttons: .res 1 ; button status bits
-OldValue: .res 1 ; Temp for MoveCheck routine
-NewValue: .res 1 ; Temp for MoveCheck routine
-
-; Default values for above variables
+OldValue: .res 1 ; Temp for MoveCheck routine
+NewValue: .res 1 ; Temp for MoveCheck routine
.rodata
+; Default values for above variables
; (We use ".proc" because we want to define both a label and a scope.)
.proc DefVars
.word 0 ; YMin
.word SCREEN_WIDTH ; XMax
.word SCREEN_HEIGHT ; YMax
- .byte %00000000 ; Buttons
+ .byte %00000000 ; Buttons
.endproc
.code
bpl @L1
cli
- rts
+ rts
;----------------------------------------------------------------------------
; GETBOX: Return the mouse bounding box. The parameters are passed as they
sta (ptr1),y
dey
bpl @L1
- rts
+ rts
;----------------------------------------------------------------------------
; MOVE: Move the mouse to a new position. The position is passed as it comes
lda (sp),y
sta XPos ; New X position
- jsr CMOVEX ; Move the cursor
+ jsr CMOVEX ; Move the cursor
- cli ; Allow interrupts
- rts
+ cli ; Allow interrupts
+ rts
;----------------------------------------------------------------------------
; BUTTONS: Return the button mask in a/x.
BUTTONS:
- lda Buttons
+ lda Buttons
ldx #0
- and #$1F
+ and #$1F
rts
;----------------------------------------------------------------------------
; POS: Return the mouse position in the MOUSE_POS struct pointed to by ptr1.
; No return code required.
-POS: ldy #MOUSE_POS::XCOORD ; Structure offset
+POS: ldy #MOUSE_POS::XCOORD ; Structure offset
- sei ; Disable interrupts
- lda XPos ; Transfer the position
- sta (ptr1),y
- lda XPos+1
- iny
- sta (ptr1),y
- lda YPos
+ sei ; Disable interrupts
+ lda XPos ; Transfer the position
+ sta (ptr1),y
+ lda XPos+1
+ iny
+ sta (ptr1),y
+ lda YPos
iny
sta (ptr1),y
- lda YPos+1
- cli ; Enable interrupts
+ lda YPos+1
+ cli ; Enable interrupts
iny
sta (ptr1),y ; Store last byte
- rts ; Done
+ rts ; Done
;----------------------------------------------------------------------------
; INFO: Returns mouse position and current button mask in the MOUSE_INFO
; call _mouse_pos to initialize the struct pointer and fill the position
; fields.
-INFO: jsr POS
+INFO: jsr POS
; Fill in the button state
- jsr BUTTONS ; Will not touch ptr1
- ldy #MOUSE_INFO::BUTTONS
- sta (ptr1),y
+ jsr BUTTONS ; Will not touch ptr1
+ ldy #MOUSE_INFO::BUTTONS
+ sta (ptr1),y
- rts
+ rts
;----------------------------------------------------------------------------
; IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl
; Record the state of the buttons.
; Avoid crosstalk between the keyboard and the mouse.
- ldy #%00000000 ; Set ports A and B to input
- sty CIA1_DDRB
- sty CIA1_DDRA ; Keyboard won't look like mouse
- lda CIA1_PRB ; Read Control-Port 1
- dec CIA1_DDRA ; Set port A back to output
- eor #%11111111 ; Bit goes up when button goes down
- sta Buttons
- beq @L0 ;(bze)
- dec CIA1_DDRB ; Mouse won't look like keyboard
- sty CIA1_PRB ; Set "all keys pushed"
-
-@L0: lda SID_ADConv1 ; Get mouse X movement
- ldy OldPotX
- jsr MoveCheck ; Calculate movement vector
+ ldy #%00000000 ; Set ports A and B to input
+ sty CIA1_DDRB
+ sty CIA1_DDRA ; Keyboard won't look like mouse
+ lda CIA1_PRB ; Read Control-Port 1
+ dec CIA1_DDRA ; Set port A back to output
+ eor #%11111111 ; Bit goes up when button goes down
+ sta Buttons
+ beq @L0 ;(bze)
+ dec CIA1_DDRB ; Mouse won't look like keyboard
+ sty CIA1_PRB ; Set "all keys pushed"
+
+@L0: lda SID_ADConv1 ; Get mouse X movement
+ ldy OldPotX
+ jsr MoveCheck ; Calculate movement vector
; Skip processing if nothing has changed
bcc @SkipX
- sty OldPotX
+ sty OldPotX
; Calculate the new X coordinate (--> a/y)
- add XPos
- tay ; Remember low byte
- txa
- adc XPos+1
- tax
+ add XPos
+ tay ; Remember low byte
+ txa
+ adc XPos+1
+ tax
; Limit the X coordinate to the bounding box
- cpy XMin
- sbc XMin+1
- bpl @L1
- ldy XMin
- ldx XMin+1
- jmp @L2
-@L1: txa
-
- cpy XMax
- sbc XMax+1
- bmi @L2
- ldy XMax
- ldx XMax+1
-@L2: sty XPos
- stx XPos+1
+ cpy XMin
+ sbc XMin+1
+ bpl @L1
+ ldy XMin
+ ldx XMin+1
+ jmp @L2
+@L1: txa
+
+ cpy XMax
+ sbc XMax+1
+ bmi @L2
+ ldy XMax
+ ldx XMax+1
+@L2: sty XPos
+ stx XPos+1
; Move the mouse pointer to the new X pos
; Calculate the Y movement vector
-@SkipX: lda SID_ADConv2 ; Get mouse Y movement
- ldy OldPotY
- jsr MoveCheck ; Calculate movement
+@SkipX: lda SID_ADConv2 ; Get mouse Y movement
+ ldy OldPotY
+ jsr MoveCheck ; Calculate movement
; Skip processing if nothing has changed
bcc @SkipY
- sty OldPotY
+ sty OldPotY
; Calculate the new Y coordinate (--> a/y)
- sta OldValue
- lda YPos
- sub OldValue
- tay
- stx OldValue
- lda YPos+1
- sbc OldValue
- tax
+ sta OldValue
+ lda YPos
+ sub OldValue
+ tay
+ stx OldValue
+ lda YPos+1
+ sbc OldValue
+ tax
; Limit the Y coordinate to the bounding box
- cpy YMin
- sbc YMin+1
- bpl @L3
- ldy YMin
- ldx YMin+1
- jmp @L4
-@L3: txa
-
- cpy YMax
- sbc YMax+1
- bmi @L4
- ldy YMax
- ldx YMax+1
-@L4: sty YPos
- stx YPos+1
+ cpy YMin
+ sbc YMin+1
+ bpl @L3
+ ldy YMin
+ ldx YMin+1
+ jmp @L4
+@L3: txa
+
+ cpy YMax
+ sbc YMax+1
+ bmi @L4
+ ldy YMax
+ ldx YMax+1
+@L4: sty YPos
+ stx YPos+1
; Move the mouse pointer to the new Y pos
;
; Move check routine, called for both coordinates.
;
-; Entry: y = old value of pot register
-; a = current value of pot register
-; Exit: y = value to use for old value
-; x/a = delta value for position
+; Entry: y = old value of pot register
+; a = current value of pot register
+; Exit: y = value to use for old value
+; x/a = delta value for position
;
MoveCheck:
- sty OldValue
- sta NewValue
- ldx #$00
-
- sub OldValue ; a = mod64 (new - old)
- and #%01111111
- cmp #%01000000 ; if (a > 0)
- bcs @L1 ;
- lsr a ; a /= 2;
- beq @L2 ; if (a != 0)
- ldy NewValue ; y = NewValue
+ sty OldValue
+ sta NewValue
+ ldx #$00
+
+ sub OldValue ; a = mod64 (new - old)
+ and #%01111111
+ cmp #%01000000 ; if (a > 0)
+ bcs @L1 ;
+ lsr a ; a /= 2;
+ beq @L2 ; if (a != 0)
+ ldy NewValue ; y = NewValue
+ sec
+ rts ; return
+
+@L1: ora #%11000000 ; else, "or" in high-order bits
+ cmp #$FF ; if (a != -1)
+ beq @L2
sec
- rts ; return
-
-@L1: ora #%11000000 ; else, "or" in high-order bits
- cmp #$FF ; if (a != -1)
- beq @L2
- sec
- ror a ; a /= 2
- dex ; high byte = -1 (X = $FF)
- ldy NewValue
+ ror a ; a /= 2
+ dex ; high byte = -1 (X = $FF)
+ ldy NewValue
sec
- rts
+ rts
-@L2: txa ; A = $00
+@L2: txa ; A = $00
clc
- rts
+ rts
projects / cc65 / blobdiff