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https://github.com/cc65/cc65.git
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435 lines
9.0 KiB
ArmAsm
435 lines
9.0 KiB
ArmAsm
;
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; Driver for the AppleMouse II Card.
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;
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; Oliver Schmidt, 03.09.2005
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;
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.include "zeropage.inc"
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.include "mouse-kernel.inc"
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.include "apple2.inc"
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; ------------------------------------------------------------------------
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SETMOUSE = $12 ; Sets mouse mode
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SERVEMOUSE = $13 ; Services mouse interrupt
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READMOUSE = $14 ; Reads mouse position
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CLEARMOUSE = $15 ; Clears mouse position to 0 (for delta mode)
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POSMOUSE = $16 ; Sets mouse position to a user-defined pos
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CLAMPMOUSE = $17 ; Sets mouse bounds in a window
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HOMEMOUSE = $18 ; Sets mouse to upper-left corner of clamp win
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INITMOUSE = $19 ; Resets mouse clamps to default values and
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; sets mouse position to 0,0
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pos1_lo := $0478
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pos1_hi := $0578
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pos2_lo := $04F8
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pos2_hi := $05F8
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status := $0778
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; ------------------------------------------------------------------------
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.segment "JUMPTABLE"
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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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; 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_EARLY_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 coord
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CMOVEY: jmp $0000 ; Move the cursor to Y coord
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; ------------------------------------------------------------------------
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.bss
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box: .tag MOUSE_BOX
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info: .tag MOUSE_INFO
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slot: .res 1
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visible:.res 1
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; ------------------------------------------------------------------------
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.rodata
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offsets:.byte $05 ; Pascal 1.0 ID byte
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.byte $07 ; Pascal 1.0 ID byte
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.byte $0B ; Pascal 1.1 generic signature byte
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.byte $0C ; Device signature byte
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values: .byte $38 ; Fixed
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.byte $18 ; Fixed
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.byte $01 ; Fixed
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.byte $20 ; X-Y pointing device type 0
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size = * - values
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inibox: .word 0 ; MinX
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.word 0 ; MinY
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.word 279 ; MaxX
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.word 191 ; MaxY
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; ------------------------------------------------------------------------
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.data
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firmware:
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; Lookup and patch firmware address lobyte
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lookup: ldy $FF00,x ; Patched at runtime
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sty jump+1 ; Modify code below
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; Apple II Mouse TechNote #1, Interrupt Environment with the Mouse:
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; "Enter all mouse routines (...) with the X register set to $Cn
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; and Y register set to $n0, where n = the slot number."
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xparam: ldx #$FF ; Patched at runtime
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yparam: ldy #$FF ; Patched at runtime
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jump: jmp $FFFF ; Patched at runtime
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; ------------------------------------------------------------------------
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.code
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; INSTALL: Is called after the driver is loaded into memory. If possible,
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; check if the hardware is present. Must return an MOUSE_ERR_xx code in A/X.
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INSTALL:
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lda #<$C000
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sta ptr1
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lda #>$C000
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sta ptr1+1
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; Search for AppleMouse II firmware in slots 1 - 7
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next: inc ptr1+1
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lda ptr1+1
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cmp #>$C800
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bcc :+
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; Mouse firmware not found
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lda #<MOUSE_ERR_NO_DEVICE
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ldx #>MOUSE_ERR_NO_DEVICE
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rts
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; Check Pascal 1.1 Firmware Protocol ID bytes
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: ldx #size - 1
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: ldy offsets,x
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lda values,x
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cmp (ptr1),y
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bne next
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dex
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bpl :-
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; Get and patch firmware address hibyte
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lda ptr1+1
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sta lookup+2
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sta xparam+1
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sta jump+2
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; Disable interrupts now because setting the slot number makes
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; the IRQ handler (maybe called due to some non-mouse IRQ) try
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; calling the firmware which isn't correctly set up yet
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sei
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; Convert to and save slot number
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and #$0F
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sta slot
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; Convert to and patch I/O register index
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asl
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asl
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asl
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asl
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sta yparam+1
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; The AppleMouse II Card needs the ROM switched in
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; to be able to detect an Apple //e and use RDVBL
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bit $C082
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; Reset mouse hardware
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ldx #INITMOUSE
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jsr firmware
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; Switch in LC bank 2 for R/O
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bit $C080
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; Turn mouse on
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lda #%00000001
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ldx #SETMOUSE
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jsr firmware
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; Set initial mouse clamps
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lda #<inibox
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ldx #>inibox
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jsr SETBOX
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; Set initial mouse position
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ldx slot
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lda #<(279 / 2)
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sta pos1_lo,x
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lda #>(279 / 2)
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sta pos1_hi,x
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lda #<(191 / 2)
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sta pos2_lo,x
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lda #>(191 / 2)
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sta pos2_hi,x
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ldx #POSMOUSE
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jsr firmware
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; Update cursor
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jsr update
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; Turn VBL interrupt on
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lda #%00001001
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ldx #SETMOUSE
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common: jsr firmware
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; Enable interrupts and return success
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cli
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lda #<MOUSE_ERR_OK
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ldx #>MOUSE_ERR_OK
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rts
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; UNINSTALL: 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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; Hide cursor
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sei
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jsr CHIDE
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; Turn mouse off
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lda #%00000000
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ldx #SETMOUSE
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bne common ; Branch always
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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:
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sta ptr1
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stx ptr1+1
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; Set x clamps
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ldx #$00
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ldy #MOUSE_BOX::MINX
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jsr :+
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; Set y clamps
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ldx #$01
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ldy #MOUSE_BOX::MINY
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; Apple II Mouse TechNote #1, Interrupt Environment with the Mouse:
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; "Disable interrupts before placing position information in the
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; screen holes."
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: sei
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; Set low clamp
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lda (ptr1),y
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sta box,y
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sta pos1_lo
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iny
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lda (ptr1),y
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sta box,y
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sta pos1_hi
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; Skip one word
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iny
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iny
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; Set high clamp
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iny
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lda (ptr1),y
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sta box,y
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sta pos2_lo
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iny
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lda (ptr1),y
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sta box,y
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sta pos2_hi
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txa
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ldx #CLAMPMOUSE
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bne common ; Branch always
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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:
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sta ptr1
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stx ptr1+1
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ldy #.sizeof(MOUSE_BOX)-1
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: lda box,y
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sta (ptr1),y
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dey
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bpl :-
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rts
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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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MOVE:
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ldy slot
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sei
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; Set y
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sta pos2_lo,y
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txa
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sta pos2_hi,y
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tya
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tax
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ldy #$00 ; Start at top of stack
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; Set x
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lda (sp),y
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iny
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sta pos1_lo,x
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lda (sp),y
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sta pos1_hi,x
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; Update cursor
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jsr update
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ldx #POSMOUSE
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bne common ; Branch always
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; HIDE: Is called to hide the mouse cursor. The mouse kernel manages a
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; 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:
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dec visible
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sei
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jsr CHIDE
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cli
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rts
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; SHOW: Is called to show the mouse cursor. The mouse kernel manages a
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; 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:
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inc visible
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rts
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; BUTTONS: Return the button mask in A/X.
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BUTTONS:
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lda info + MOUSE_INFO::BUTTONS
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ldx #$00
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rts
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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:
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ldy #.sizeof(MOUSE_POS)-1
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bne copy ; Branch always
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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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INFO:
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ldy #.sizeof(MOUSE_INFO)-1
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copy: sei
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: lda info,y
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sta (ptr1),y
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dey
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bpl :-
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cli
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rts
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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 MOUSE_ERR_xx code in A/X.
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IOCTL:
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lda #<MOUSE_ERR_INV_IOCTL
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ldx #>MOUSE_ERR_INV_IOCTL
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rts
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; IRQ: Called from the builtin runtime IRQ handler as a subroutine. All
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; registers are already saved, no parameters are passed, but the carry flag
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; is clear on entry. The routine must return with carry set if the interrupt
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; was handled, otherwise with carry clear.
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IRQ:
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; Check for installed mouse
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lda slot
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beq done
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; Check for mouse interrupt
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ldx #SERVEMOUSE
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jsr firmware
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bcc :+
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clc ; Interrupt not handled
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done: rts
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: ldx #READMOUSE
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jsr firmware
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; Get status
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ldy slot
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lda status,y
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tax ; Save status
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; Extract button down values
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asl ; C = Button 0 is currently down
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and #%00100000 ; !Z = Button 1 is currently down
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; Set button mask
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beq :+
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lda #MOUSE_BTN_RIGHT
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: bcc :+
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ora #MOUSE_BTN_LEFT
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: sta info + MOUSE_INFO::BUTTONS
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; Check for mouse movement
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txa ; Restore status
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and #%00100000 ; X or Y changed since last READMOUSE
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beq :+
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; Remove the cursor at the old position
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update: jsr CHIDE
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; Get and set the new X position
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ldy slot
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lda pos1_lo,y
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ldx pos1_hi,y
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sta info + MOUSE_POS::XCOORD
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stx info + MOUSE_POS::XCOORD+1
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jsr CMOVEX
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; Get and set the new Y position
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ldy slot
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lda pos2_lo,y
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ldx pos2_hi,y
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sta info + MOUSE_POS::YCOORD
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stx info + MOUSE_POS::YCOORD+1
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jsr CMOVEY
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; Check for visibility
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: lda visible
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beq :+
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; Draw the cursor at the new position
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jsr CSHOW
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: sec ; Interrupt handled
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rts
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