mirror of https://github.com/cc65/cc65.git
484 lines
13 KiB
ArmAsm
484 lines
13 KiB
ArmAsm
;
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; Driver for a potentiometer "mouse", e.g. Koala Pad
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;
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; 2006-08-20, Stefan Haubenthal
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; 2009-09-26, Ullrich von Bassewitz
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; 2014-04-26, Christian Groessler
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; 2020-07-14, Greg King
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;
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.include "zeropage.inc"
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.include "mouse-kernel.inc"
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.include "c128.inc"
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.macpack generic
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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module_header _c128_pot_mou
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HEADER:
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; Driver signature
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.byte $6d, $6f, $75 ; "mou"
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.byte MOUSE_API_VERSION ; Mouse driver API version number
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; Library reference
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libref: .addr $0000
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; Jump table
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.addr INSTALL
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.addr UNINSTALL
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.addr HIDE
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.addr SHOW
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.addr SETBOX
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.addr GETBOX
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.addr MOVE
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.addr BUTTONS
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.addr POS
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.addr INFO
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.addr IOCTL
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.addr IRQ
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; Mouse driver flags
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.byte MOUSE_FLAG_LATE_IRQ
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; Callback table, set by the kernel before INSTALL is called
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CHIDE: jmp $0000 ; Hide the cursor
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CSHOW: jmp $0000 ; Show the cursor
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CPREP: jmp $0000 ; Prepare to move the cursor
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CDRAW: jmp $0000 ; Draw the cursor
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CMOVEX: jmp $0000 ; Move the cursor to X coord
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CMOVEY: jmp $0000 ; Move the cursor to Y coord
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;----------------------------------------------------------------------------
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; Constants
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SCREEN_HEIGHT = 200
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SCREEN_WIDTH = 320
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.enum JOY
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UP = $01
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DOWN = $02
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LEFT = $04
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RIGHT = $08
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FIRE = $10
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.endenum
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;----------------------------------------------------------------------------
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; Global variables. The bounding box values are sorted so that they can be
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; written with the least effort in the SETBOX and GETBOX routines, so don't
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; reorder them.
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.bss
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Vars:
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YPos: .res 2 ; Current mouse position, Y
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XPos: .res 2 ; Current mouse position, X
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XMin: .res 2 ; X1 value of bounding box
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YMin: .res 2 ; Y1 value of bounding box
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XMax: .res 2 ; X2 value of bounding box
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YMax: .res 2 ; Y2 value of bounding box
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Buttons: .res 1 ; Button mask
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INIT_save: .res 1
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; Keyboard buffer fill level at start of interrupt
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old_key_count: .res 1
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; Original IRQ vector
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old_irq: .res 2
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.rodata
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; Default values for above variables
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; (We use ".proc" because we want to define both a label and a scope.)
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.proc DefVars
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.word SCREEN_HEIGHT/2 ; YPos
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.word SCREEN_WIDTH/2 ; XPos
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.word 0 ; XMin
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.word 0 ; YMin
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.word SCREEN_WIDTH - 1 ; XMax
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.word SCREEN_HEIGHT - 1 ; YMax
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.byte 0 ; Buttons
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.endproc
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.code
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;----------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present.
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; Must return an MOUSE_ERR_xx code in a/x.
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INSTALL:
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; Disable the BASIC interpreter's interrupt-driven sprite-motion code.
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; That allows direct access to the VIC-IIe's sprite registers.
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lda INIT_STATUS
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sta INIT_save
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lda #%11000000
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sta INIT_STATUS
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; Initialize variables. Just copy the default stuff over
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ldx #.sizeof(DefVars)-1
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@L1: lda DefVars,x
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sta Vars,x
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dex
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bpl @L1
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; Be sure the mouse cursor is invisible and at the default location. We
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; need to do that here, because our mouse interrupt handler doesn't set the
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; mouse position if it hasn't changed.
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sei
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jsr CHIDE
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lda XPos
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ldx XPos+1
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jsr CMOVEX
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lda YPos
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ldx YPos+1
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jsr CMOVEY
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; Initiate our IRQ magic.
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; Remember the ROM IRQ continuation address.
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ldx IRQInd+2
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lda IRQInd+1
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stx old_irq+1
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sta old_irq
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lda libref
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ldx libref+1
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sta ptr3
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stx ptr3+1
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; Set the ROM IRQ continuation address to point to the provided routine.
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ldy #2
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lda (ptr3),y
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sta IRQInd+1
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iny
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lda (ptr3),y
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sta IRQInd+2
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; Set the address of our IRQ callback routine.
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; Because it's called via "rts", we must use "address-1".
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iny
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lda #<(callback-1)
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sta (ptr3),y
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iny
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lda #>(callback-1)
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sta (ptr3),y
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; Set the ROM entry-point vector.
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; Because it's called via "rts", we must decrement it by one.
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iny
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lda old_irq
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sub #<1
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sta (ptr3),y
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iny
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lda old_irq+1
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sbc #>1
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sta (ptr3),y
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cli
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; Done
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ldx #MOUSE_ERR_OK
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.assert MOUSE_ERR_OK = 0, error
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txa
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rts
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;----------------------------------------------------------------------------
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; UNINSTALL routine. Is called before the driver is removed from memory.
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; No return code required (the driver is removed from memory on return).
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UNINSTALL:
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lda old_irq
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ldx old_irq+1
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sei
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sta IRQInd+1
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stx IRQInd+2
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;cli ; This will be done at end of HIDE
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jsr HIDE ; Hide cursor on exit
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lda INIT_save
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sta INIT_STATUS
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rts
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;----------------------------------------------------------------------------
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; HIDE routine. Is called to hide the mouse pointer. The mouse kernel manages
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; a counter for calls to show/hide, and the driver entry point is only called
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; if the mouse is currently visible and should get hidden. For most drivers,
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; no special action is required besides hiding the mouse cursor.
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; No return code required.
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HIDE: sei
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jsr CHIDE
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cli
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rts
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;----------------------------------------------------------------------------
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; SHOW routine. Is called to show the mouse pointer. The mouse kernel manages
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; a counter for calls to show/hide, and the driver entry point is only called
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; if the mouse is currently hidden and should become visible. For most drivers,
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; no special action is required besides enabling the mouse cursor.
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; No return code required.
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SHOW: sei
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jsr CSHOW
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cli
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rts
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;----------------------------------------------------------------------------
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; SETBOX: Set the mouse bounding box. The parameters are passed as they come
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; from the C program, that is, a pointer to a mouse_box struct in a/x.
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; No checks are done if the mouse is currently inside the box, this is the job
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; of the caller. It is not necessary to validate the parameters, trust the
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; caller and save some code here. No return code required.
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SETBOX: sta ptr1
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stx ptr1+1 ; Save data pointer
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ldy #.sizeof (MOUSE_BOX)-1
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sei
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@L1: lda (ptr1),y
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sta XMin,y
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dey
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bpl @L1
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cli
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rts
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;----------------------------------------------------------------------------
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; GETBOX: Return the mouse bounding box. The parameters are passed as they
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; come from the C program, that is, a pointer to a mouse_box struct in a/x.
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GETBOX: sta ptr1
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stx ptr1+1 ; Save data pointer
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ldy #.sizeof (MOUSE_BOX)-1
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sei
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@L1: lda XMin,y
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sta (ptr1),y
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dey
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bpl @L1
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cli
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rts
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;----------------------------------------------------------------------------
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; MOVE: Move the mouse to a new position. The position is passed as it comes
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; from the C program, that is: X on the stack and Y in a/x. The C wrapper will
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; remove the parameter from the stack on return.
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; No checks are done if the new position is valid (within the bounding box or
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; the screen). No return code required.
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;
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MOVE: sei ; No interrupts
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sta YPos
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stx YPos+1 ; New Y position
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jsr CMOVEY ; Set it
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ldy #$01
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lda (sp),y
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sta XPos+1
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tax
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dey
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lda (sp),y
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sta XPos ; New X position
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jsr CMOVEX ; Move the cursor
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cli ; Allow interrupts
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rts
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;----------------------------------------------------------------------------
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; BUTTONS: Return the button mask in a/x.
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BUTTONS:
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lda Buttons
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ldx #$00
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; Make the buttons look like a 1351 mouse.
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and #JOY::LEFT | JOY::RIGHT
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lsr a
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lsr a
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;clc ; ("lsr" shifted zero into carry flag)
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adc #%00001110 ; Shift bit 1 over to bit 4
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and #MOUSE_BTN_LEFT | MOUSE_BTN_RIGHT
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rts
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;----------------------------------------------------------------------------
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; POS: Return the mouse position in the MOUSE_POS struct pointed to by ptr1.
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; No return code required.
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POS: ldy #MOUSE_POS::XCOORD ; Structure offset
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sei ; Disable interrupts
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lda XPos ; Transfer the position
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sta (ptr1),y
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lda XPos+1
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iny
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sta (ptr1),y
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lda YPos
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iny
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sta (ptr1),y
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lda YPos+1
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cli ; Enable interrupts
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iny
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sta (ptr1),y ; Store last byte
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rts ; Done
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;----------------------------------------------------------------------------
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; INFO: Returns mouse position and current button mask in the MOUSE_INFO
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; struct pointed to by ptr1. No return code required.
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;
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; We're cheating here to keep the code smaller: The first fields of the
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; mouse_info struct are identical to the mouse_pos struct, so we will just
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; call _mouse_pos to initialize the struct pointer and fill the position
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; fields.
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INFO: jsr POS
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; Fill in the button state
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jsr BUTTONS
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ldy #MOUSE_INFO::BUTTONS
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sta (ptr1),y
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rts
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;----------------------------------------------------------------------------
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; IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl
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; specific data in ptr1, and the ioctl code in A.
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; Must return an error code in a/x.
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;
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IOCTL: lda #<MOUSE_ERR_INV_IOCTL ; We don't support ioctls for now
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ldx #>MOUSE_ERR_INV_IOCTL
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rts
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;----------------------------------------------------------------------------
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; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context
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; (so be careful).
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;
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IRQ: jsr CPREP
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lda KEY_COUNT
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sta old_key_count
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lda #$FF
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sta CIA1_PRA
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lda CIA1_PRB ; Read port #1
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eor #%11111111 ; Make all bits active high
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sta Buttons
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ldx #%01000000 ; Read port 1 paddles
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stx CIA1_PRA
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ldy #<256
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: dey
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bne :-
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ldx SID_ADConv1
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stx XPos
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ldx SID_ADConv2
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stx YPos
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lda #$FF
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tax
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bne @AddX ; Branch always
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lda #$01
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ldx #$00
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; Calculate the new X coordinate (--> a/y)
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@AddX: add XPos
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tay ; Remember low byte
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txa
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adc XPos+1
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tax
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; Limit the X coordinate to the bounding box
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cpy XMin
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sbc XMin+1
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bpl @L1
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ldy XMin
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ldx XMin+1
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jmp @L2
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@L1: txa
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cpy XMax
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sbc XMax+1
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bmi @L2
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ldy XMax
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ldx XMax+1
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@L2: sty XPos
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stx XPos+1
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; Move the mouse pointer to the new X pos
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tya
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jsr CMOVEX
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lda #$FF
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tax
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bne @AddY
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@Down: lda #$01
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ldx #$00
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; Calculate the new Y coordinate (--> a/y)
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@AddY: add YPos
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tay ; Remember low byte
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txa
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adc YPos+1
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tax
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; Limit the Y coordinate to the bounding box
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cpy YMin
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sbc YMin+1
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bpl @L3
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ldy YMin
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ldx YMin+1
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jmp @L4
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@L3: txa
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cpy YMax
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sbc YMax+1
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bmi @L4
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ldy YMax
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ldx YMax+1
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@L4: sty YPos
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stx YPos+1
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; Move the mouse pointer to the new X pos
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tya
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jsr CMOVEY
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jsr CDRAW
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clc ; Interrupt not "handled"
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rts
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.define OLD_BUTTONS Buttons ; Tells callback.inc where the old port status is stored
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.include "callback.inc"
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