mirror of
https://github.com/cc65/cc65.git
synced 2024-12-25 02:29:52 +00:00
453 lines
13 KiB
ArmAsm
453 lines
13 KiB
ArmAsm
;
|
|
; Driver for the Inkwell Systems 170-C and 184-C lightpens.
|
|
;
|
|
; This driver reads only the main button on the 184-C.
|
|
;
|
|
; 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_inkwl_mou
|
|
|
|
HEADER:
|
|
|
|
; Driver signature
|
|
|
|
.byte $6d, $6f, $75 ; ASCII "mou"
|
|
.byte MOUSE_API_VERSION ; Mouse driver API version number
|
|
|
|
; Library reference
|
|
|
|
LIBREF: .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_EARLY_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_WIDTH = XSIZE * 8
|
|
SCREEN_HEIGHT = YSIZE * 8
|
|
|
|
;----------------------------------------------------------------------------
|
|
; 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.
|
|
|
|
.rodata
|
|
|
|
; Default values for below variables
|
|
; (We use ".proc" because we want to define both a label and a scope.)
|
|
|
|
.proc DefVars
|
|
.word 0 ; XMin
|
|
.word 0 ; YMin
|
|
.word SCREEN_WIDTH - 1 ; XMax
|
|
.word SCREEN_HEIGHT - 1 ; YMax
|
|
.endproc
|
|
|
|
.bss
|
|
|
|
Vars:
|
|
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
|
|
|
|
XPos: .res 2 ; Current lightpen position, X
|
|
YPos: .res 2 ; Current lightpen position, Y
|
|
|
|
OldPenX: .res 1 ; Previous HW-counter values
|
|
OldPenY: .res 1
|
|
|
|
.data
|
|
|
|
; Default Inkwell calibration.
|
|
; The first number is the width of the left border;
|
|
; the second number is the actual calibration value.
|
|
; See a comment below (at "Calculate the new X co-ordinate")
|
|
; for the reason for the third number.
|
|
|
|
XOffset: .byte (24 + 24) / 2 ; x-offset
|
|
|
|
; Jump to a function that puts a new calibration value into XOffset.
|
|
Calibrate: jmp $0000
|
|
|
|
|
|
.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
|
|
@L0: lda DefVars,x
|
|
sta Vars,x
|
|
dex
|
|
bpl @L0
|
|
|
|
ldx #15 ; Change to system bank
|
|
stx IndReg
|
|
ldy #VIC_LPEN_X
|
|
lda (vic),y
|
|
sta OldPenX
|
|
ldy #VIC_LPEN_Y
|
|
lda (vic),y
|
|
sta OldPenY
|
|
ldx ExecReg ; Change back to execution bank
|
|
stx IndReg
|
|
|
|
; Call a calibration function through the library-reference.
|
|
|
|
lda LIBREF
|
|
ldx LIBREF+1
|
|
sta ptr1 ; Point to mouse_adjuster
|
|
stx ptr1+1
|
|
ldy #1
|
|
lda (ptr1),y
|
|
bze @L1 ; Don't call pointer if it's NULL
|
|
sta Calibrate+2 ; Point to function
|
|
dey
|
|
lda (ptr1),y
|
|
sta Calibrate+1
|
|
lda #<XOffset ; Function will set this variable
|
|
ldx #>XOffset
|
|
jsr Calibrate
|
|
|
|
; Be sure that the lightpen cursor is invisible and at the default location.
|
|
; It needs to be done here because the lightpen interrupt handler doesn't
|
|
; set the lightpen position if it hasn't changed.
|
|
|
|
@L1: sei
|
|
jsr CHIDE
|
|
|
|
lda #<(SCREEN_HEIGHT / 2)
|
|
ldx #>(SCREEN_HEIGHT / 2)
|
|
jsr MoveY
|
|
lda #<(SCREEN_WIDTH / 2)
|
|
ldx #>(SCREEN_WIDTH / 2)
|
|
jsr MoveX
|
|
cli
|
|
|
|
; Done, return zero.
|
|
|
|
lda #MOUSE_ERR_OK
|
|
tax
|
|
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 lightpen pointer. The mouse kernel manages
|
|
; a counter for calls to show/hide, and the driver entry point is called only
|
|
; if the mouse is currently visible, and should get hidden. For most drivers,
|
|
; no special action is required besides hiding the lightpen cursor.
|
|
; No return code required.
|
|
|
|
HIDE: sei
|
|
jsr CHIDE
|
|
cli
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; SHOW routine. Is called to show the lightpen pointer. The mouse kernel manages
|
|
; a counter for calls to show/hide, and the driver entry point is called only
|
|
; if the mouse is currently hidden, and should become visible. For most drivers,
|
|
; no special action is required besides enabling the lightpen cursor.
|
|
; No return code required.
|
|
|
|
SHOW: sei
|
|
jsr CSHOW
|
|
cli
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; SETBOX: Set the lightpen 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 lightpen is currently 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 lightpen 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
|
|
|
|
ldy #$01
|
|
lda (sp),y
|
|
tax
|
|
dey
|
|
lda (sp),y
|
|
jsr MoveX ; Move the cursor
|
|
|
|
cli ; Allow interrupts
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; BUTTONS: Return the button mask in .XA.
|
|
|
|
BUTTONS:
|
|
ldx #15 ; To system bank
|
|
stx IndReg
|
|
ldy #CIA::PRB
|
|
lda (cia2),y ; Read joystick inputs
|
|
ldx ExecReg ; Back to execution bank
|
|
stx IndReg
|
|
|
|
; Joystick 1, directions in bits 3-0.
|
|
; Make the lightpen button look like a 1351 mouse.
|
|
|
|
asl a ; Move joystick-left bit ...
|
|
asl a ; ... to fire-button bit
|
|
eor #MOUSE_BTN_LEFT
|
|
and #MOUSE_BTN_LEFT
|
|
ldx #>$0000
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; POS: Return the lightpen 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
|
|
|
|
;----------------------------------------------------------------------------
|
|
; INFO: Returns lightpen 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'll just
|
|
; call _mouse_pos to initiate the struct pointer, and fill the position
|
|
; fields.
|
|
|
|
INFO: jsr POS
|
|
|
|
; Fill in the button state
|
|
|
|
jsr BUTTONS ; Will not touch ptr1
|
|
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 .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.
|
|
;
|
|
|
|
IRQ: jsr CPREP
|
|
ldx #15 ; To system bank
|
|
stx IndReg
|
|
|
|
; Read the VIC-II lightpen registers.
|
|
|
|
ldy #VIC_LPEN_Y
|
|
lda (vic),y
|
|
cmp OldPenY
|
|
|
|
; Skip processing if nothing has changed.
|
|
|
|
beq @SkipY
|
|
sta OldPenY
|
|
ldx ExecReg ; Back to execution bank
|
|
stx IndReg
|
|
|
|
; Subtract the height of the top border, so that the lightpen co-ordinate
|
|
; will match the TGI co-ordinate.
|
|
|
|
sub #50
|
|
tay ; Remember low byte
|
|
ldx #>$0000
|
|
|
|
; Limit the Y co-ordinate to the bounding box.
|
|
|
|
txa
|
|
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
|
|
|
|
ldx #15 ; To system bank
|
|
stx IndReg
|
|
@SkipY: ldy #VIC_LPEN_X
|
|
lda (vic),y
|
|
ldx ExecReg ; Back to execution bank
|
|
stx IndReg
|
|
cmp OldPenX
|
|
|
|
; Skip processing if nothing has changed.
|
|
|
|
beq @SkipX
|
|
sta OldPenX
|
|
|
|
; Adjust the value by the calibration offset.
|
|
|
|
sub XOffset
|
|
|
|
; Calculate the new X co-ordinate.
|
|
; The VIC-II register is eight bits; but, the screen co-ordinate is nine bits.
|
|
; Therefore, the VIC-II number is doubled. Then, it points to every other pixel;
|
|
; but, it can reach across the screen.
|
|
|
|
asl a
|
|
tay ; Remember low byte
|
|
lda #>$0000
|
|
rol a
|
|
tax ; Remember high byte
|
|
|
|
; 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
|
|
|
|
; Done
|
|
|
|
@SkipX: jsr CDRAW
|
|
clc ; Interrupt not "handled"
|
|
rts
|
|
|
|
; Move the lightpen pointer to the new Y pos.
|
|
|
|
MoveY: sta YPos
|
|
stx YPos+1
|
|
jmp CMOVEY
|
|
|
|
; Move the lightpen pointer to the new X pos.
|
|
|
|
MoveX: sta XPos
|
|
stx XPos+1
|
|
jmp CMOVEX
|