mirror of
https://github.com/cc65/cc65.git
synced 2024-11-04 17:04:58 +00:00
390 lines
10 KiB
ArmAsm
390 lines
10 KiB
ArmAsm
;
|
|
; Driver for a "joystick mouse".
|
|
;
|
|
; Ullrich von Bassewitz, 2004-04-05
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
.include "mouse-kernel.inc"
|
|
.include "c128.inc"
|
|
|
|
.macpack generic
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Header. Includes jump table
|
|
|
|
.segment "JUMPTABLE"
|
|
|
|
HEADER:
|
|
|
|
; Driver signature
|
|
|
|
.byte $6d, $6f, $75 ; "mou"
|
|
.byte MOUSE_API_VERSION ; Mouse driver API version number
|
|
|
|
; Jump table.
|
|
|
|
.addr INSTALL
|
|
.addr UNINSTALL
|
|
.addr HIDE
|
|
.addr SHOW
|
|
.addr BOX
|
|
.addr MOVE
|
|
.addr BUTTONS
|
|
.addr POS
|
|
.addr INFO
|
|
.addr IOCTL
|
|
.addr IRQ
|
|
|
|
; Callback table, set by the kernel before INSTALL is called
|
|
|
|
CHIDE: jmp $0000 ; Hide the cursor
|
|
CSHOW: jmp $0000 ; Show the cursor
|
|
CMOVEX: jmp $0000 ; Move the cursor to X coord
|
|
CMOVEY: jmp $0000 ; Move the cursor to Y coord
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Constants
|
|
|
|
SCREEN_HEIGHT = 200
|
|
SCREEN_WIDTH = 320
|
|
|
|
.enum JOY
|
|
UP = $01
|
|
DOWN = $02
|
|
LEFT = $04
|
|
RIGHT = $08
|
|
FIRE = $10
|
|
.endenum
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Global variables. The bounding box values are sorted so that they can be
|
|
; written with the least effort in the BOX routine, so don't reorder them.
|
|
|
|
.bss
|
|
|
|
Vars:
|
|
YPos: .res 2 ; Current mouse position, Y
|
|
XPos: .res 2 ; Current mouse position, X
|
|
YMax: .res 2 ; Y2 value of bounding box
|
|
XMax: .res 2 ; X2 value of bounding box
|
|
YMin: .res 2 ; Y1 value of bounding box
|
|
XMin: .res 2 ; X1 value of bounding box
|
|
Buttons: .res 1 ; Button mask
|
|
|
|
; Temporary value used in the int handler
|
|
|
|
Temp: .res 1
|
|
|
|
; Default values for above variables
|
|
|
|
.rodata
|
|
|
|
.proc DefVars
|
|
.word SCREEN_HEIGHT/2 ; YPos
|
|
.word SCREEN_WIDTH/2 ; XPos
|
|
.word SCREEN_HEIGHT ; YMax
|
|
.word SCREEN_WIDTH ; XMax
|
|
.word 0 ; YMin
|
|
.word 0 ; XMin
|
|
.byte 0 ; Buttons
|
|
.endproc
|
|
|
|
.code
|
|
|
|
;----------------------------------------------------------------------------
|
|
; INSTALL routine. Is called after the driver is loaded into memory. If
|
|
; possible, check if the hardware is present.
|
|
; Must return an MOUSE_ERR_xx code in a/x.
|
|
|
|
INSTALL:
|
|
|
|
; Initialize variables. Just copy the default stuff over
|
|
|
|
ldx #.sizeof(DefVars)-1
|
|
@L1: lda DefVars,x
|
|
sta Vars,x
|
|
dex
|
|
bpl @L1
|
|
|
|
; Be sure the mouse cursor is invisible and at the default location. We
|
|
; need to do that here, because our mouse interrupt handler doesn't set the
|
|
; mouse position if it hasn't changed.
|
|
|
|
sei
|
|
jsr CHIDE
|
|
lda XPos
|
|
ldx XPos+1
|
|
jsr CMOVEX
|
|
lda YPos
|
|
ldx YPos+1
|
|
jsr CMOVEY
|
|
cli
|
|
|
|
; Done, return zero (= MOUSE_ERR_OK)
|
|
|
|
ldx #$00
|
|
txa
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; UNINSTALL routine. Is called before the driver is removed from memory.
|
|
; No return code required (the driver is removed from memory on return).
|
|
|
|
UNINSTALL = HIDE ; Hide cursor on exit
|
|
|
|
;----------------------------------------------------------------------------
|
|
; HIDE routine. Is called to hide the mouse pointer. The mouse kernel manages
|
|
; a counter for calls to show/hide, and the driver entry point is only called
|
|
; if the mouse is currently visible and should get hidden. For most drivers,
|
|
; no special action is required besides hiding the mouse cursor.
|
|
; No return code required.
|
|
|
|
HIDE: sei
|
|
jsr CHIDE
|
|
cli
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; SHOW routine. Is called to show the mouse pointer. The mouse kernel manages
|
|
; a counter for calls to show/hide, and the driver entry point is only called
|
|
; if the mouse is currently hidden and should become visible. For most drivers,
|
|
; no special action is required besides enabling the mouse cursor.
|
|
; No return code required.
|
|
|
|
SHOW: sei
|
|
jsr CSHOW
|
|
cli
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; BOX: Set the mouse bounding box. The parameters are passed as they come from
|
|
; the C program, that is, maxy in a/x and the other parameters on the stack.
|
|
; The C wrapper will remove the parameters from the stack when the driver
|
|
; routine returns.
|
|
; No checks are done if the mouse is currently inside the box, this is the job
|
|
; of the caller. It is not necessary to validate the parameters, trust the
|
|
; caller and save some code here. No return code required.
|
|
|
|
BOX: ldy #5
|
|
sei
|
|
sta YMax
|
|
stx YMax+1
|
|
|
|
@L1: lda (sp),y
|
|
sta XMax,y
|
|
dey
|
|
bpl @L1
|
|
|
|
cli
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; MOVE: Move the mouse to a new position. The position is passed as it comes
|
|
; from the C program, that is: X on the stack and Y in a/x. The C wrapper will
|
|
; remove the parameter from the stack on return.
|
|
; No checks are done if the new position is valid (within the bounding box or
|
|
; the screen). No return code required.
|
|
;
|
|
|
|
MOVE: sei ; No interrupts
|
|
|
|
sta YPos
|
|
stx YPos+1 ; New Y position
|
|
jsr CMOVEY ; Set it
|
|
|
|
ldy #$01
|
|
lda (sp),y
|
|
sta XPos+1
|
|
tax
|
|
dey
|
|
lda (sp),y
|
|
sta XPos ; New X position
|
|
|
|
jsr CMOVEX ; Move the cursor
|
|
|
|
cli ; Allow interrupts
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; BUTTONS: Return the button mask in a/x.
|
|
|
|
BUTTONS:
|
|
lda Buttons
|
|
ldx #$00
|
|
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
|
|
|
|
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
|
|
|
|
iny
|
|
sta (ptr1),y ; Store last byte
|
|
|
|
rts ; Done
|
|
|
|
;----------------------------------------------------------------------------
|
|
; INFO: Returns mouse position and current button mask in the MOUSE_INFO
|
|
; struct pointed to by ptr1. No return code required.
|
|
;
|
|
; We're cheating here to keep the code smaller: The first fields of the
|
|
; mouse_info struct are identical to the mouse_pos struct, so we will just
|
|
; call _mouse_pos to initialize the struct pointer and fill the position
|
|
; fields.
|
|
|
|
INFO: jsr POS
|
|
|
|
; Fill in the button state
|
|
|
|
lda Buttons
|
|
ldy #MOUSE_INFO::BUTTONS
|
|
sta (ptr1),y
|
|
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl
|
|
; specific data in ptr1, and the ioctl code in A.
|
|
; Must return an error code in a/x.
|
|
;
|
|
|
|
IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioclts for now
|
|
ldx #>MOUSE_ERR_INV_IOCTL
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context
|
|
; (so be careful).
|
|
;
|
|
|
|
IRQ: lda #$7F
|
|
sta CIA1_PRA
|
|
lda CIA1_PRB ; Read joystick #0
|
|
and #$1F
|
|
eor #$1F ; Make all bits active high
|
|
sta Temp
|
|
|
|
; Check for a pressed button and place the result into Buttons
|
|
|
|
ldx #$00 ; Assume no button pressed
|
|
and #JOY::FIRE ; Check fire button
|
|
beq @L0 ; Jump if not pressed
|
|
ldx #MOUSE_BTN_LEFT ; Left (only) button is pressed
|
|
@L0: stx Buttons
|
|
|
|
; Check left/right
|
|
|
|
lda Temp ; Read joystick #0
|
|
and #(JOY::LEFT | JOY::RIGHT)
|
|
beq @SkipX ;
|
|
|
|
; We will cheat here and rely on the fact that either the left, OR the right
|
|
; bit can be active
|
|
|
|
and #JOY::RIGHT ; Check RIGHT bit
|
|
bne @Right
|
|
lda #$FF
|
|
tax
|
|
bne @AddX ; Branch always
|
|
@Right: lda #$01
|
|
ldx #$00
|
|
|
|
; Calculate the new X coordinate (--> a/y)
|
|
|
|
@AddX: add XPos
|
|
tay ; Remember low byte
|
|
txa
|
|
adc XPos+1
|
|
tax
|
|
|
|
; Limit the X coordinate to the bounding box
|
|
|
|
cpy XMin
|
|
sbc XMin+1
|
|
bpl @L1
|
|
ldy XMin
|
|
ldx XMin+1
|
|
jmp @L2
|
|
@L1: txa
|
|
|
|
cpy XMax
|
|
sbc XMax+1
|
|
bmi @L2
|
|
ldy XMax
|
|
ldx XMax+1
|
|
@L2: sty XPos
|
|
stx XPos+1
|
|
|
|
; Move the mouse pointer to the new X pos
|
|
|
|
tya
|
|
jsr CMOVEX
|
|
|
|
; Calculate the Y movement vector
|
|
|
|
@SkipX: lda Temp ; Read joystick #0
|
|
and #(JOY::UP | JOY::DOWN) ; Check up/down
|
|
beq @SkipY ;
|
|
|
|
; We will cheat here and rely on the fact that either the up, OR the down
|
|
; bit can be active
|
|
|
|
lsr a ; Check UP bit
|
|
bcc @Down
|
|
lda #$FF
|
|
tax
|
|
bne @AddY
|
|
@Down: lda #$01
|
|
ldx #$00
|
|
|
|
; Calculate the new Y coordinate (--> a/y)
|
|
|
|
@AddY: add YPos
|
|
tay ; Remember low byte
|
|
txa
|
|
adc YPos+1
|
|
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
|
|
|
|
; Move the mouse pointer to the new X pos
|
|
|
|
tya
|
|
jmp CMOVEY
|
|
|
|
; Done
|
|
|
|
@SkipY: rts
|
|
|