mirror of
https://github.com/cc65/cc65.git
synced 2024-12-23 19:29:37 +00:00
453 lines
12 KiB
ArmAsm
453 lines
12 KiB
ArmAsm
;
|
|
; Driver for a "joystick mouse".
|
|
;
|
|
; 2009-09-26, Ullrich von Bassewitz
|
|
; 2014-09-10, Greg King
|
|
;
|
|
|
|
.include "zeropage.inc"
|
|
.include "../extzp.inc"
|
|
|
|
.include "mouse-kernel.inc"
|
|
.include "cbm510.inc"
|
|
|
|
.macpack generic
|
|
.macpack module
|
|
|
|
|
|
; ------------------------------------------------------------------------
|
|
; Header. Includes jump table
|
|
|
|
module_header _cbm510_joy_mou
|
|
|
|
HEADER:
|
|
|
|
; Driver signature
|
|
|
|
.byte $6d, $6f, $75 ; ASCII "mou"
|
|
.byte MOUSE_API_VERSION ; Mouse driver API version number
|
|
|
|
; Library reference
|
|
|
|
.addr $0000
|
|
|
|
; Jump table
|
|
|
|
.addr INSTALL
|
|
.addr UNINSTALL
|
|
.addr HIDE
|
|
.addr SHOW
|
|
.addr SETBOX
|
|
.addr GETBOX
|
|
.addr MOVE
|
|
.addr BUTTONS
|
|
.addr POS
|
|
.addr INFO
|
|
.addr IOCTL
|
|
.addr IRQ
|
|
|
|
; Mouse driver flags
|
|
|
|
.byte MOUSE_FLAG_LATE_IRQ
|
|
|
|
; Callback table, set by the kernel before INSTALL is called.
|
|
|
|
CHIDE: jmp $0000 ; Hide the cursor
|
|
CSHOW: jmp $0000 ; Show the cursor
|
|
CPREP: jmp $0000 ; Prepare to move the cursor
|
|
CDRAW: jmp $0000 ; Draw the cursor
|
|
CMOVEX: jmp $0000 ; Move the cursor to x co-ord.
|
|
CMOVEY: jmp $0000 ; Move the cursor to y co-ord.
|
|
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Constants
|
|
|
|
SCREEN_HEIGHT = YSIZE * 8
|
|
SCREEN_WIDTH = XSIZE * 8
|
|
|
|
.scope JOY
|
|
UP = %00000001
|
|
DOWN = %00000010
|
|
LEFT = %00000100
|
|
RIGHT = %00001000
|
|
FIRE = %00010000
|
|
.endscope
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Global variables. The bounding box values are sorted so that they can be
|
|
; written with the least effort in the SETBOX and GETBOX routines; so, don't
|
|
; re-order them.
|
|
|
|
.bss
|
|
|
|
Vars:
|
|
YPos: .res 2 ; Current mouse position, y
|
|
XPos: .res 2 ; Current mouse position, x
|
|
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
|
|
|
|
; Temporary value used in the interrupt handler
|
|
|
|
Temp: .res 1
|
|
|
|
.rodata
|
|
|
|
; Default values for above variables
|
|
; (We use ".proc" because we want to define both a label and a scope.)
|
|
|
|
.proc DefVars
|
|
.word SCREEN_HEIGHT / 2 ; YPos
|
|
.word SCREEN_WIDTH / 2 ; XPos
|
|
.word 0 ; XMin
|
|
.word 0 ; YMin
|
|
.word SCREEN_WIDTH - 1 ; XMax
|
|
.word SCREEN_HEIGHT - 1 ; YMax
|
|
.endproc
|
|
|
|
.code
|
|
|
|
;----------------------------------------------------------------------------
|
|
; INSTALL routine. Is called after the driver is loaded into memory. If
|
|
; possible, check if the hardware is present.
|
|
; Must return a MOUSE_ERR_xx code in .XA.
|
|
|
|
INSTALL:
|
|
|
|
; Initiate 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.
|
|
|
|
ldx #>MOUSE_ERR_OK
|
|
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 called only
|
|
; if the mouse currently is 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 called only
|
|
; if the mouse currently is 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
|
|
|
|
;----------------------------------------------------------------------------
|
|
; SETBOX: Set the mouse bounding box. The parameters are passed as they come
|
|
; from the C program, that is, a pointer to a mouse_box struct in .XA.
|
|
; No checks are done if the mouse currently is inside the box; that 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.
|
|
|
|
SETBOX: sta ptr1
|
|
stx ptr1+1 ; Save data pointer
|
|
|
|
ldy #.sizeof (MOUSE_BOX) - 1
|
|
sei
|
|
|
|
@L1: lda (ptr1),y
|
|
sta XMin,y
|
|
dey
|
|
bpl @L1
|
|
|
|
cli
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; GETBOX: Return the mouse bounding box. The parameters are passed as they
|
|
; come from the C program, that is, a pointer to a mouse_box struct in .XA.
|
|
|
|
GETBOX: sta ptr1
|
|
stx ptr1+1 ; Save data pointer
|
|
|
|
ldy #.sizeof (MOUSE_BOX) - 1
|
|
|
|
@L1: lda XMin,y
|
|
sta (ptr1),y
|
|
dey
|
|
bpl @L1
|
|
|
|
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 .XA. 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
|
|
|
|
jsr MoveY ; Set new y position
|
|
|
|
ldy #1
|
|
lda (sp),y
|
|
sta XPos+1
|
|
tax
|
|
dey
|
|
lda (sp),y
|
|
jsr MoveX ; Move the pointer
|
|
|
|
cli ; Allow interrupts
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; BUTTONS: Return the button mask in .XA.
|
|
; Joystick 2's fire button is the left mouse button.
|
|
; Joystick 1's fire button is the right mouse button.
|
|
|
|
BUTTONS:
|
|
ldx #15 ; Switch to the system bank
|
|
stx IndReg
|
|
|
|
; Get the fire-button bits
|
|
|
|
ldy #CIA::PRA
|
|
lda (cia2),y
|
|
|
|
; Switch back to the execution bank.
|
|
|
|
ldy ExecReg
|
|
sty IndReg
|
|
|
|
; Joystick 2, fire button is in bit 7.
|
|
; Joystick 1, fire button is in bit 6.
|
|
|
|
and #%11000000
|
|
asl a ; Move bits 7,6 to bits 1,0
|
|
rol a
|
|
rol a
|
|
adc #%00001110 ; Move bit 1 to bit 4
|
|
and #MOUSE_BTN_LEFT | MOUSE_BTN_RIGHT
|
|
|
|
; Bits go up when buttons go down.
|
|
|
|
eor #MOUSE_BTN_LEFT | MOUSE_BTN_RIGHT
|
|
ldx #>$0000
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; 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 just will
|
|
; use _mouse_pos to fill the position fields.
|
|
|
|
INFO: jsr BUTTONS
|
|
|
|
; Fill in the button state.
|
|
|
|
ldy #MOUSE_INFO::BUTTONS
|
|
sta (ptr1),y
|
|
|
|
; jmp POS ; Fall through
|
|
|
|
;----------------------------------------------------------------------------
|
|
; 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
|
|
|
|
;----------------------------------------------------------------------------
|
|
; 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 .XA.
|
|
;
|
|
|
|
IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioctls, for now
|
|
ldx #>MOUSE_ERR_INV_IOCTL
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; IRQ: Irq.-handler entry point. Called as a subroutine, but in the IRQ context
|
|
; (so, be careful). The routine MUST return carry set if the interrupt has been
|
|
; 'handled' -- which means that the interrupt source is gone. Otherwise, it
|
|
; MUST return carry clear.
|
|
; Reads joystick 2.
|
|
;
|
|
|
|
IRQ: jsr CPREP
|
|
ldy #15 ; Switch to the system bank
|
|
sty IndReg
|
|
|
|
; Get the direction bits.
|
|
|
|
ldy #CIA::PRB
|
|
lda (cia2),y ; Read joystick inputs
|
|
|
|
; Switch back to the execution bank.
|
|
|
|
ldy ExecReg
|
|
sty IndReg
|
|
|
|
; Joystick 2, directions in bits 7-4.
|
|
; Mask the relevant bits.
|
|
|
|
and #$F0
|
|
eor #$F0 ; All bits are inverted
|
|
sta Temp
|
|
|
|
; Check left/right.
|
|
|
|
and #(JOY::LEFT | JOY::RIGHT) << 4
|
|
bze @SkipX
|
|
|
|
; We will cheat here, and rely on the fact that either the left OR the right
|
|
; bit can be active.
|
|
|
|
and #JOY::RIGHT << 4 ; Check RIGHT bit
|
|
bnz @Right
|
|
lda #<-$0001
|
|
tax
|
|
bnz @AddX ; Branch always
|
|
@Right: lda #<$0001
|
|
ldx #>$0001
|
|
|
|
; Calculate the new x co-ordinate (--> .YA).
|
|
|
|
@AddX: add XPos
|
|
tay ; Remember low byte
|
|
txa
|
|
adc XPos+1
|
|
tax
|
|
|
|
; Limit the x co-ordinate 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: tya
|
|
jsr MoveX
|
|
|
|
; Calculate the y movement vector.
|
|
|
|
@SkipX: lda Temp ; Get joystick again
|
|
and #(JOY::UP | JOY::DOWN) << 4 ; Check up/down
|
|
bze @SkipY
|
|
|
|
; We will cheat here, and rely on the fact that either the up OR the down
|
|
; bit can be active.
|
|
|
|
and #JOY::UP << 4 ; Check UP bit
|
|
bze @Down
|
|
lda #<-$0001
|
|
tax
|
|
bnz @AddY
|
|
@Down: lda #<$0001
|
|
ldx #>$0001
|
|
|
|
; Calculate the new y co-ordinate (--> .YA).
|
|
|
|
@AddY: add YPos
|
|
tay ; Remember low byte
|
|
txa
|
|
adc YPos+1
|
|
tax
|
|
|
|
; Limit the y co-ordinate 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: tya
|
|
jsr MoveY
|
|
|
|
; Done
|
|
|
|
@SkipY: jsr CDRAW
|
|
clc ; Interrupt not "handled"
|
|
rts
|
|
|
|
; Move the mouse pointer to the new x pos.
|
|
|
|
MoveX: sta XPos
|
|
stx XPos+1
|
|
jmp CMOVEX
|
|
|
|
; Move the mouse pointer to the new y pos.
|
|
|
|
MoveY: sta YPos
|
|
stx YPos+1
|
|
jmp CMOVEY
|