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https://github.com/cc65/cc65.git
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d6c3bd29ac
This change was suppsed to fix the issue that the former JUMPTABLE is merked as 'ro' while it is actually written to in several scenarios. When drivers are converted using co65 and then compiled into ROMs the JUMPTABLE isn't copied to RAM and therefore the write operations in question fail. However unfortunately I didn't succeed in changing that :-( Just setting the former JUMPTABLE to 'rw' broke the drivers. So I placed the DATA segment directly after the former JUMPTABLE segment. This made the drivers converted with co65 work again - obviously after changing libsrc/Makefile:235 from '--code-label' to '--data-label'. But the actual dynamic drivers still didn't work as the former JUMPTABLE wasn't placed as the beginning of the loaded file anymore. That effect could be changed by exchanging src/ld65/o65.c:1391 with src/ld65/o65.c:1394 but doing so broke the drivers again :-((
451 lines
12 KiB
ArmAsm
451 lines
12 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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; 2013-09-05, 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 "HEADER"
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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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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 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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.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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.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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asl 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: jsr CPREP
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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: jsr CDRAW
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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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