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2c975d3642
Up to now static drivers were created via co65 from dynamic drivers. However there was an issue with that approach: The dynamic drivers are "o65 simple files" which obligates that they start with the 'code' segment. However dynamic drivers need to start with the module header - which is written to. For dynamic drivers this isn't more than a conceptual issue because they are always contain a 'data' segment and may therefore only be loaded into writable memory. However when dynamic drivers are converted to static drivers using co65 then that issue becomes a real problem as then the 'code' segment may end up in non-writable memory - and thus writing to the module header fails. Instead of changing the way dynamic drivers work I opted to rather make static driver creation totally independent from dynamic drivers. This allows to place the module header in the 'data' segment (see 'module.mac').
492 lines
13 KiB
ArmAsm
492 lines
13 KiB
ArmAsm
;
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; Driver for a "joystick mouse".
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;
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; 2009-09-26, Ullrich von Bassewitz
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; 2014-04-26, Christian Groessler
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; 2014-05-01, 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_joy_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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; Initialize our IRQ magic
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; remember ROM IRQ continuation address
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lda IRQInd+2
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sta old_irq+1
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lda IRQInd+1
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sta old_irq
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lda libref
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sta ptr3
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lda libref+1
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sta ptr3+1
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; set 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 address of our IRQ callback routine
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; since it's called via "rts" we have to 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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iny
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; set ROM entry point vector
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; since it's called via "rts" we have to decrement it by one
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lda old_irq
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sec
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sbc #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 #0
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sta (ptr3),y
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cli
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; Done, return zero (= MOUSE_ERR_OK)
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ldx #$00
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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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sei
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sta IRQInd+1
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lda old_irq+1
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sta 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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and #MOUSE_BTN_LEFT ; Left button -- same as JOY::FIRE
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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). The routine MUST return carry set if the interrupt has been
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; 'handled' - which means that the interrupt source is gone. Otherwise it
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; MUST return carry clear.
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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 #$7F
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sta CIA1_PRA
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lda CIA1_PRB ; Read joystick #0
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and #$1F
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eor #$1F ; Make all bits active high
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sta Buttons
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; Check left/right
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and #(JOY::LEFT | JOY::RIGHT)
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beq @SkipX ;
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; We will cheat here and rely on the fact that either the left, OR the right
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; bit can be active
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and #JOY::RIGHT ; Check RIGHT bit
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bne @Right
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lda #$FF
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tax
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bne @AddX ; Branch always
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@Right: 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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; Calculate the Y movement vector
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@SkipX: lda Buttons ; Read joystick #0
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and #(JOY::UP | JOY::DOWN) ; Check up/down
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beq @SkipY ;
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; We will cheat here and rely on the fact that either the up, OR the down
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; bit can be active
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lsr a ; Check UP bit
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bcc @Down
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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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; Done
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@SkipY: 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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