From 38451fa8a4d6a1e4141f24bb50e774582ac564af Mon Sep 17 00:00:00 2001 From: Christian Groessler Date: Wed, 8 Feb 2017 14:34:35 +0100 Subject: [PATCH] intermediate check-in -- creativision joystick driver --- asminc/creativision.inc | 6 +- libsrc/creativision/joy/creativision-stdjoy.s | 191 ++++++++++++++++++ libsrc/creativision/joy_stat_stddrv.s | 12 ++ libsrc/creativision/libref.s | 3 +- 4 files changed, 207 insertions(+), 5 deletions(-) create mode 100644 libsrc/creativision/joy/creativision-stdjoy.s create mode 100644 libsrc/creativision/joy_stat_stddrv.s diff --git a/asminc/creativision.inc b/asminc/creativision.inc index 624b65e8f..bd30bc462 100644 --- a/asminc/creativision.inc +++ b/asminc/creativision.inc @@ -29,10 +29,10 @@ CH_URCORNER = 36 CH_LLCORNER = 37 CH_LRCORNER = 38 -;** I/O +;** I/O (Zero-page variables) ZP_KEYBOARD = $10 ZP_JOY0_DIR = $11 ZP_JOY1_DIR = $13 -ZP_JOY_LBUTTONS = $16 -ZP_JOY_RBUTTONS = $17 +ZP_JOY0_BUTTONS = $16 +ZP_JOY1_BUTTONS = $17 diff --git a/libsrc/creativision/joy/creativision-stdjoy.s b/libsrc/creativision/joy/creativision-stdjoy.s new file mode 100644 index 000000000..f24a8045b --- /dev/null +++ b/libsrc/creativision/joy/creativision-stdjoy.s @@ -0,0 +1,191 @@ +; +; Standard joystick driver for the Creativision. +; +; Christian Groessler, 2017-02-06 +; + + .include "zeropage.inc" + + .include "joy-kernel.inc" + .include "joy-error.inc" + .include "creativision.inc" + + .macpack module + + +; ------------------------------------------------------------------------ +; Header. Includes jump table + + module_header _creativisionstd_joy + +; Driver signature + + .byte $6A, $6F, $79 ; "joy" + .byte JOY_API_VERSION ; Driver API version number + +; Library reference + + .addr $0000 + +; Button state masks (8 values) + + .byte $10 ; JOY_UP + .byte $04 ; JOY_DOWN + .byte $20 ; JOY_LEFT + .byte $08 ; JOY_RIGHT + .byte $01 ; JOY_FIRE (button #1) + .byte $02 ; JOY_FIRE2 (button #2) + .byte $00 ; Future expansion + .byte $00 ; Future expansion + +; Jump table. + + .addr INSTALL + .addr UNINSTALL + .addr COUNT + .addr READJOY + .addr 0 ; IRQ entry not used + +; ------------------------------------------------------------------------ +; Constants + +JOY_COUNT = 2 ; Number of joysticks we support + +; ------------------------------------------------------------------------ +; Code + + .code + +; ------------------------------------------------------------------------ +; INSTALL routine. Is called after the driver is loaded into memory. If +; possible, check if the hardware is present and determine the amount of +; memory available. +; Must return an JOY_ERR_xx code in a/x. +; + +INSTALL: + lda #JOY_ERR_OK + ldx #0 +; rts ; Fall through + +; ------------------------------------------------------------------------ +; UNINSTALL routine. Is called before the driver is removed from memory. +; Can do cleanup or whatever. Must not return anything. +; + +UNINSTALL: + rts + + +; ------------------------------------------------------------------------ +; COUNT: Return the total number of available joysticks in a/x. +; + +COUNT: + lda #JOY_COUNT + rts + +; ------------------------------------------------------------------------ +; READ: Read a particular joystick passed in A. +; + +READJOY: + and #1 ; fix joystick number + bne READJOY_1 ; read right joystick + +; Read left joystick + + ldx ZP_JOY0_DIR + lda ZP_JOY0_BUTTONS + jmp convert ; convert joystick state to sane cc65 values + +; Read right joystick + +READJOY_1: + + ldx ZP_JOY1_DIR + lda ZP_JOY1_BUTTONS + lsr a + lsr a + ;jmp convert ; convert joystick state to sane cc65 values + ; fall thru... + +; ------------------------------------------------------------------------ +; convert: make runtime lib compatible values +; A - buttons +; X - direction +; + +convert: + ldy #0 + sty retval ; initialize return value + +; ------ +; buttons: + ; Port values are for the left hand joystick (right hand joystick + ; values were shifted to the right to be identical). + ; Why are there two bits indicating a pressed trigger? + ; According to the "Second book of programs for the Dick Smith Wizard" + ; (pg. 88ff), the left hand fire button gives the value of + ; %00010001 and the right hand button gives %00100010 + ; Why two bits? Am I missing something? Can there be cases that just + ; one of those bits is set? + ; We just test if any of those two bits is not zero... + + tay + and #%00010001 + beq cnv_1 + + inc retval ; left button pressed + +cnv_1: tya + and #%00100010 + beq cnv_2 + + lda #$02 + ora retval + sta retval ; right button pressed + +; ------ +; direction: +cnv_2: txa + ; tested with https://sourceforge.net/projects/creativisionemulator + ; $49 - %01001001 - up + ; $41 - %01000001 - down + ; $4D - %01001101 - left + ; $45 - %01000101 - right + ; + ; are these correct? "Second book of programs for the Dick Smith Wizard" pg. 85 says something different + ; ignored for now... + ; $85 - %10000101 - up + right + ; $8D - %10001101 - down + left + ; $89 - %10001001 - up + left + ; $85 - %10000101 - down + right (emulator bug?) + + bit testbit ; bit #0 set? + beq done ; no, no direction + + and #%00001100 ; mask out other bits + tax + lda #%00000100 ; init bitmask +loop: dex + bmi done2 + asl a + bne loop + +done2: ora retval + rts + +done: lda retval + rts + +; ------------------------------------------------------------------------ +; + .data +testbit:.byte $01 + +; ------------------------------------------------------------------------ +; + .bss +retval: .res 0 diff --git a/libsrc/creativision/joy_stat_stddrv.s b/libsrc/creativision/joy_stat_stddrv.s new file mode 100644 index 000000000..fc458641c --- /dev/null +++ b/libsrc/creativision/joy_stat_stddrv.s @@ -0,0 +1,12 @@ +; +; Address of the static standard joystick driver +; +; Christian Groessler, 2017-02-06 +; +; const void joy_static_stddrv[]; +; + + .export _joy_static_stddrv + .import _creativisionstd_joy + +_joy_static_stddrv := _creativisionstd_joy diff --git a/libsrc/creativision/libref.s b/libsrc/creativision/libref.s index b642da80a..19e7e778f 100644 --- a/libsrc/creativision/libref.s +++ b/libsrc/creativision/libref.s @@ -2,8 +2,7 @@ ; Oliver Schmidt, 2013-05-31 ; - .export joy_libref, tgi_libref + .export joy_libref .import _exit joy_libref := _exit -tgi_libref := _exit -- 2.39.5