From: Christian Groessler Date: Sun, 5 Jan 2014 15:43:17 +0000 (+0100) Subject: Trakball mouse driver X-Git-Tag: V2.15~195^2~5 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=f1646a369537d11cc8ac75300fb3365f9eac8027;p=cc65 Trakball mouse driver --- diff --git a/libsrc/atari/mou/atrtt.s b/libsrc/atari/mou/atrtt.s new file mode 100644 index 000000000..16ed32602 --- /dev/null +++ b/libsrc/atari/mou/atrtt.s @@ -0,0 +1,481 @@ +; +; Mouse driver for Atari Trakball +; +; Christian Groessler, 2014-01-05 +; + + .include "zeropage.inc" + .include "mouse-kernel.inc" + .include "atari.inc" + + .macpack generic + +; ------------------------------------------------------------------------ +; Header. Includes jump table + +.segment "JUMPTABLE" + +HEADER: + +; Driver signature + + .byte $6d, $6f, $75 ; "mou" + .byte MOUSE_API_VERSION ; Mouse driver API version number + +; Library reference + + .addr $0000 + +; Jump table + + .addr INSTALL + .addr UNINSTALL + .addr HIDE + .addr SHOW + .addr SETBOX + .addr GETBOX + .addr MOVE + .addr BUTTONS + .addr POS + .addr INFO + .addr IOCTL + .addr IRQ + +; Mouse driver flags + + .byte MOUSE_FLAG_LATE_IRQ + +; Callback table, set by the kernel before INSTALL is called + +CHIDE: jmp $0000 ; Hide the cursor +CSHOW: jmp $0000 ; Show the cursor +CMOVEX: jmp $0000 ; Move the cursor to X coord +CMOVEY: jmp $0000 ; Move the cursor to Y coord + + +;---------------------------------------------------------------------------- +; Constants + +SCREEN_HEIGHT = 191 +SCREEN_WIDTH = 319 + +.enum JOY + UP = $01 + DOWN = $02 + LEFT = $04 + RIGHT = $08 +.endenum + +;---------------------------------------------------------------------------- +; Global variables. The bounding box values are sorted so that they can be +; written with the least effort in the SETBOX and GETBOX routines, so don't +; reorder them. + +.bss + +Vars: +YPos: .res 2 ; Current mouse position, Y +XPos: .res 2 ; Current mouse position, X +XMin: .res 2 ; X1 value of bounding box +YMin: .res 2 ; Y1 value of bounding box +XMax: .res 2 ; X2 value of bounding box +YMax: .res 2 ; Y2 value of bounding box +Buttons: .res 1 ; Button mask + + +visible: .res 1 + +; Default values for above variables + +.rodata + +.proc DefVars + .word SCREEN_HEIGHT/2 ; YPos + .word SCREEN_WIDTH/2 ; XPos + .word 0 ; XMin + .word 0 ; YMin + .word SCREEN_WIDTH ; XMax + .word SCREEN_HEIGHT ; YMax + .byte 0 ; Buttons +.endproc + +.code + +;---------------------------------------------------------------------------- +; INSTALL routine. Is called after the driver is loaded into memory. If +; possible, check if the hardware is present. +; Must return an MOUSE_ERR_xx code in a/x. + +INSTALL: + +; Initialize variables. Just copy the default stuff over + + ldx #.sizeof(DefVars)-1 +@L1: lda DefVars,x + sta Vars,x + dex + bpl @L1 + +; Be sure the mouse cursor is invisible and at the default location. We +; need to do that here, because our mouse interrupt handler doesn't set the +; mouse position if it hasn't changed. + + php + sei + jsr CHIDE + lda XPos + ldx XPos+1 + jsr CMOVEX + lda YPos + ldx YPos+1 + jsr CMOVEY + plp + +; Done, return zero (= MOUSE_ERR_OK) + + ldx #$00 + txa + rts + +;---------------------------------------------------------------------------- +; UNINSTALL routine. Is called before the driver is removed from memory. +; No return code required (the driver is removed from memory on return). + +UNINSTALL = HIDE ; Hide cursor on exit + +;---------------------------------------------------------------------------- +; HIDE routine. Is called to hide the mouse pointer. The mouse kernel manages +; a counter for calls to show/hide, and the driver entry point is only called +; if the mouse is currently visible and should get hidden. For most drivers, +; no special action is required besides hiding the mouse cursor. +; No return code required. + +HIDE: dec visible + php + sei + jsr CHIDE + plp + rts + +;---------------------------------------------------------------------------- +; SHOW routine. Is called to show the mouse pointer. The mouse kernel manages +; a counter for calls to show/hide, and the driver entry point is only called +; if the mouse is currently hidden and should become visible. For most drivers, +; no special action is required besides enabling the mouse cursor. +; No return code required. + +SHOW: inc visible + php + sei + jsr CSHOW + plp + rts + +;---------------------------------------------------------------------------- +; SETBOX: Set the mouse bounding box. The parameters are passed as they come +; from the C program, that is, a pointer to a mouse_box struct in a/x. +; No checks are done if the mouse is currently inside the box, this is the job +; of the caller. It is not necessary to validate the parameters, trust the +; caller and save some code here. No return code required. + +SETBOX: sta ptr1 + stx ptr1+1 ; Save data pointer + + ldy #.sizeof (MOUSE_BOX)-1 + php + sei + +@L1: lda (ptr1),y + sta XMin,y + dey + bpl @L1 + + plp + rts + +;---------------------------------------------------------------------------- +; GETBOX: Return the mouse bounding box. The parameters are passed as they +; come from the C program, that is, a pointer to a mouse_box struct in a/x. + +GETBOX: sta ptr1 + stx ptr1+1 ; Save data pointer + + ldy #.sizeof (MOUSE_BOX)-1 + php + sei + +@L1: lda XMin,y + sta (ptr1),y + dey + bpl @L1 + + plp + rts + +;---------------------------------------------------------------------------- +; MOVE: Move the mouse to a new position. The position is passed as it comes +; from the C program, that is: X on the stack and Y in a/x. The C wrapper will +; remove the parameter from the stack on return. +; No checks are done if the new position is valid (within the bounding box or +; the screen). No return code required. +; + +MOVE: php + sei ; No interrupts + + pha + lda visible + beq @nohide + txa + pha + jsr CHIDE + pla + tax +@nohide:pla + + sta YPos + stx YPos+1 ; New Y position + jsr CMOVEY ; Set it + + ldy #$01 + lda (sp),y + sta XPos+1 + tax + dey + lda (sp),y + sta XPos ; New X position + + jsr CMOVEX ; Move the cursor + + lda visible + beq @Ret + + jsr CSHOW + +@Ret: plp ; Restore interrupt flag + rts + +;---------------------------------------------------------------------------- +; BUTTONS: Return the button mask in a/x. + +BUTTONS: + lda Buttons + ldx #$00 + rts + +;---------------------------------------------------------------------------- +; POS: Return the mouse position in the MOUSE_POS struct pointed to by ptr1. +; No return code required. + +POS: ldy #MOUSE_POS::XCOORD ; Structure offset + + php + sei ; Disable interrupts + lda XPos ; Transfer the position + sta (ptr1),y + lda XPos+1 + iny + sta (ptr1),y + lda YPos + iny + sta (ptr1),y + lda YPos+1 + plp ; Restore interrupt flag + + iny + sta (ptr1),y ; Store last byte + + rts ; Done + +;---------------------------------------------------------------------------- +; INFO: Returns mouse position and current button mask in the MOUSE_INFO +; struct pointed to by ptr1. No return code required. +; +; We're cheating here to keep the code smaller: The first fields of the +; mouse_info struct are identical to the mouse_pos struct, so we will just +; call _mouse_pos to initialize the struct pointer and fill the position +; fields. + +INFO: jsr POS + +; Fill in the button state + + lda Buttons + ldy #MOUSE_INFO::BUTTONS + sta (ptr1),y + + rts + +;---------------------------------------------------------------------------- +; IOCTL: Driver defined entry point. The wrapper will pass a pointer to ioctl +; specific data in ptr1, and the ioctl code in A. +; Must return an error code in a/x. +; + +IOCTL: lda #MOUSE_ERR_INV_IOCTL + rts + +;---------------------------------------------------------------------------- +; IRQ: Irq handler entry point. Called as a subroutine but in IRQ context +; (so be careful). The routine MUST return carry set if the interrupt has been +; 'handled' - which means that the interrupt source is gone. Otherwise it +; MUST return carry clear. +; + +IRQ: + +; Check for a pressed button and place the result into Buttons + + ldx #0 + stx XPos+1 + stx YPos+1 + lda TRIG0 ; joystick #0 trigger + bne @L00 ; not pressed + ldx #MOUSE_BTN_LEFT +@L00: stx Buttons + + lda PORTA ; get other buttons + eor #255 + tax + and #4 + beq @L01 + lda #MOUSE_BTN_LEFT + ora Buttons + sta Buttons +@L01: txa + and #8 + beq @L02 + lda #MOUSE_BTN_RIGHT + ora Buttons + sta Buttons + +@L02: lda visible + beq @L03 + jsr CHIDE + +; Get cursor position +; ------------------- +; The touchpad is read thru the paddle potentiometers. The possible +; values are 1..228. Since the maximum value is less than the X +; dimension we have to "stretch" this value. In order to use only +; divisions by powers of two, we use the following appoximation: +; 320/227 = 1.4096 +; 1+1/2-1/8+1/32 = 1.4062 +; For Y we subtract 1/8 of it to get in the YMax ballpark. +; 228-228/8=199.5 +; A small area in the Y dimension of the touchpad isn't used with +; this approximation. The Y value is inverted, (0,0) is the bottom +; left corner of the touchpad. + +; X + +@L03: ldx PADDL0 ; get X postion + dex ; decrement, since it's 1-based + stx XPos + txa + lsr a + tax + clc + adc XPos + sta XPos + bcc @L04 + inc XPos+1 +@L04: txa + lsr a ; port value / 4 + lsr a ; port value / 8 + tax + sec + lda XPos + stx XPos + sbc XPos + sta XPos + bcs @L05 + dec XPos+1 +@L05: txa + lsr a ; port value / 16 + lsr a ; port value / 32 + clc + adc XPos + sta XPos + bcc @L06 + inc XPos+1 + +@L06: tay + lda XPos+1 + tax + +; Limit the X coordinate to the bounding box + + cpy XMin + sbc XMin+1 + bpl @L07 + ldy XMin + ldx XMin+1 + jmp @L08 +@L07: txa + + cpy XMax + sbc XMax+1 + bmi @L08 + ldy XMax + ldx XMax+1 +@L08: sty XPos + stx XPos+1 + +; Move the mouse pointer to the new X pos + + tya + jsr CMOVEX + +; Y + + ldx PADDL1 ; get Y postion + dex ; decrement, since it's 1-based + stx YPos + lda #228 + sec + sbc YPos ; invert value + tax + lsr a + lsr a + lsr a + sta YPos + txa + sec + sbc YPos + sta YPos + tay + lda YPos+1 + tax + +; Limit the Y coordinate to the bounding box + + cpy YMin + sbc YMin+1 + bpl @L09 + ldy YMin + ldx YMin+1 + jmp @L10 +@L09: txa + + cpy YMax + sbc YMax+1 + bmi @L10 + ldy YMax + ldx YMax+1 +@L10: sty YPos + stx YPos+1 + +; Move the mouse pointer to the new X pos + + tya + jsr CMOVEY + + lda visible + beq @L11 + jsr CSHOW + +@L11: clc ; Interrupt not "handled" + rts +