Added a driver to the CBM510 library that lets a joystick pretend to be a mouse.
This commit is contained in:
Greg King
445
libsrc/cbm510/mou/cbm510-joy.s
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445
libsrc/cbm510/mou/cbm510-joy.s
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;
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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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; 2013-08-22, Greg King
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;
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.include "zeropage.inc"
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.include "../extzp.inc"
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.include "mouse-kernel.inc"
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.include "cbm510.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "JUMPTABLE"
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HEADER:
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; Driver signature
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.byte $6d, $6f, $75 ; ASCII "mou"
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.byte MOUSE_API_VERSION ; Mouse driver API version number
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; Library reference
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.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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CMOVEX: jmp $0000 ; Move the cursor to x co-ord.
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CMOVEY: jmp $0000 ; Move the cursor to y co-ord.
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;----------------------------------------------------------------------------
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; Constants
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SCREEN_HEIGHT = YSIZE * 8
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SCREEN_WIDTH = XSIZE * 8
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.scope JOY
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UP = %00000001
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DOWN = %00000010
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LEFT = %00000100
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RIGHT = %00001000
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FIRE = %00010000
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.endscope
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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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; re-order 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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; Temporary value used in the interrupt handler
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Temp: .res 1
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; Default values for above variables
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.rodata
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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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.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 a MOUSE_ERR_xx code in .XA.
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INSTALL:
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; Initiate 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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cli
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; Done, return zero.
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ldx #>MOUSE_ERR_OK
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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 := HIDE ; Hide cursor, on exit
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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 called only
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; if the mouse currently is 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 called only
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; if the mouse currently is 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 .XA.
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; No checks are done if the mouse currently is inside the box; that 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 .XA.
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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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@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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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 .XA. 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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jsr MoveY ; Set new y position
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ldy #1
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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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jsr MoveX ; Move the pointer
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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 .XA.
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; Joystick 2's fire button is the left mouse button.
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; Joystick 1's fire button is the right mouse button.
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BUTTONS:
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ldx #15 ; Switch to the system bank
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stx IndReg
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; Get the fire-button bits
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ldy #CIA::PRA
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lda (cia2),y
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; Switch back to the execution bank.
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ldy ExecReg
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sty IndReg
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; Joystick 2, fire button is in bit 7.
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; Joystick 1, fire button is in bit 6.
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and #%11000000
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rol a ; Move bits 7,6 to bits 1,0
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rol a
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rol a
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adc #%00001110 ; Move bit 1 to bit 4
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and #MOUSE_BTN_LEFT | MOUSE_BTN_RIGHT
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; Bits go up when buttons go down.
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eor #MOUSE_BTN_LEFT | MOUSE_BTN_RIGHT
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ldx #>0
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rts
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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 just will
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; use _mouse_pos to fill the position fields.
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INFO: jsr BUTTONS
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; Fill in the button state.
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ldy #MOUSE_INFO::BUTTONS
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sta (ptr1),y
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; jmp POS ; Fall through
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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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; 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 .XA.
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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 the 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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; Reads joystick 2.
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;
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IRQ: ldy #15 ; Switch to the system bank
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sty IndReg
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; Get the direction bits.
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ldy #CIA::PRB
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lda (cia2),y ; Read joystick inputs
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; Switch back to the execution bank.
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ldy ExecReg
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sty IndReg
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; Joystick 2, directions in bits 7-4.
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; Mask the relevant bits.
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and #$F0
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eor #$F0 ; All bits are inverted
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sta Temp
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; Check left/right.
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and #(JOY::LEFT | JOY::RIGHT) << 4
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bze @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 << 4 ; Check RIGHT bit
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bnz @Right
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lda #<-1
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tax
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bnz @AddX ; Branch always
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@Right: lda #<1
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ldx #>1
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; Calculate the new x co-ordinate (--> .YA).
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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 co-ordinate 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: tya
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jsr MoveX
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; Calculate the y movement vector.
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@SkipX: lda Temp ; Get joystick again
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and #(JOY::UP | JOY::DOWN) << 4 ; Check up/down
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bze @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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and #JOY::UP << 4 ; Check UP bit
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bze @Down
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lda #<-1
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tax
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bnz @AddY
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@Down: lda #<1
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ldx #>1
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; Calculate the new y co-ordinate (--> .YA).
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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 co-ordinate 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: tya
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jsr MoveY
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; Done
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@SkipY: clc ; Interrupt not handled
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rts
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; Move the mouse pointer to the new x pos.
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MoveX: sta XPos
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stx XPos+1
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jmp CMOVEX
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; Move the mouse pointer to the new y pos.
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MoveY: sta YPos
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stx YPos+1
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jmp CMOVEY
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