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Merge pull request #397 from groessler/something_to_pull
fix creativision joystick driver
This commit is contained in:
Oliver Schmidt
GitHub
commit
98e51d10d1
@ -36,6 +36,24 @@ ZP_JOY1_DIR = $13
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ZP_JOY0_BUTTONS = $16
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ZP_JOY0_BUTTONS = $16
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ZP_JOY1_BUTTONS = $17
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ZP_JOY1_BUTTONS = $17
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;** Joystick direction values (ZP_JOY0_DIR/ZP_JOY1_DIR)
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JOY_N = $49
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JOY_NNE = $48
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JOY_NE = $47
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JOY_ENE = $46
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JOY_E = $45
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JOY_ESE = $44
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JOY_SE = $43
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JOY_SSE = $42
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JOY_S = $41
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JOY_SSW = $40
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JOY_SW = $4F
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JOY_WSW = $4E
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JOY_W = $4D
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JOY_WNW = $4C
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JOY_NW = $4B
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JOY_NNW = $4A
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;** BIOS
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;** BIOS
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BIOS_IRQ1_ADDR = $FF3F
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BIOS_IRQ1_ADDR = $FF3F
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BIOS_IRQ2_ADDR = $FF52
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BIOS_IRQ2_ADDR = $FF52
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@ -1,7 +1,7 @@
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;
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;
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; Standard joystick driver for the Creativision.
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; Standard joystick driver for the Creativision.
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;
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;
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; Christian Groessler, 2017-02-06
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; Christian Groessler, 2017-03-08
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;
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;
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.include "zeropage.inc"
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.include "zeropage.inc"
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@ -27,14 +27,23 @@
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.addr $0000
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.addr $0000
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; Button state masks (8 values)
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; Symbolic names for joystick masks (similar names like the defines in joystick.h, but not related to them)
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.byte $10 ; JOY_UP
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JOY_UP = $10
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.byte $04 ; JOY_DOWN
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JOY_DOWN = $04
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.byte $20 ; JOY_LEFT
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JOY_LEFT = $20
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.byte $08 ; JOY_RIGHT
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JOY_RIGHT = $08
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.byte $01 ; JOY_FIRE (button #1)
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JOY_FIRE = $01
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.byte $02 ; JOY_FIRE2 (button #2)
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JOY_FIRE2 = $02
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; Joystick state masks (8 values)
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.byte JOY_UP
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.byte JOY_DOWN
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.byte JOY_LEFT
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.byte JOY_RIGHT
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.byte JOY_FIRE
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.byte JOY_FIRE2
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.byte $00 ; Future expansion
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.byte $00 ; Future expansion
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.byte $00 ; Future expansion
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.byte $00 ; Future expansion
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@ -63,8 +72,7 @@ JOY_COUNT = 2 ; Number of joysticks we support
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; Must return an JOY_ERR_xx code in a/x.
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; Must return an JOY_ERR_xx code in a/x.
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;
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;
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INSTALL:
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INSTALL: lda #JOY_ERR_OK
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lda #JOY_ERR_OK
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ldx #0
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ldx #0
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; rts ; Fall through
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; rts ; Fall through
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@ -73,16 +81,14 @@ INSTALL:
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; Can do cleanup or whatever. Must not return anything.
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; Can do cleanup or whatever. Must not return anything.
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;
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;
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UNINSTALL:
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UNINSTALL: rts
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rts
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; ------------------------------------------------------------------------
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; ------------------------------------------------------------------------
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; COUNT: Return the total number of available joysticks in a/x.
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; COUNT: Return the total number of available joysticks in a/x.
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;
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;
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COUNT:
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COUNT: lda #<JOY_COUNT
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lda #<JOY_COUNT
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ldx #>JOY_COUNT
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ldx #>JOY_COUNT
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rts
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rts
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@ -90,104 +96,156 @@ COUNT:
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; READ: Read a particular joystick passed in A.
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; READ: Read a particular joystick passed in A.
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;
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;
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READJOY:
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READJOY: and #1 ; fix joystick number
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and #1 ; fix joystick number
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bne READJOY_1 ; read right joystick
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bne READJOY_1 ; read right joystick
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; Read left joystick
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; Read left joystick
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ldx ZP_JOY0_DIR
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ldx ZP_JOY0_DIR
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lda ZP_JOY0_BUTTONS
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lda ZP_JOY0_BUTTONS
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jmp convert ; convert joystick state to sane cc65 values
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jmp convert ; convert joystick state to cc65 values
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; Read right joystick
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; Read right joystick
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READJOY_1:
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READJOY_1: ldx ZP_JOY1_DIR
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ldx ZP_JOY1_DIR
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lda ZP_JOY1_BUTTONS
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lda ZP_JOY1_BUTTONS
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lsr a
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lsr a
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lsr a
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lsr a
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;jmp convert ; convert joystick state to sane cc65 values
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;jmp convert ; convert joystick state to cc65 values
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; fall thru...
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; fall thru...
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; ------------------------------------------------------------------------
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; ------------------------------------------------------------------------
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; convert: make runtime lib compatible values
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; convert: make runtime lib compatible values
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; inputs:
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; A - buttons
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; A - buttons
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; X - direction
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; X - direction
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;
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;
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convert:
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convert:
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ldy #0
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sty retval ; initialize return value
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; ------
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; ------
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; buttons:
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; buttons:
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; Port values are for the left hand joystick (right hand joystick
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; Port values are for the left hand joystick (right hand joystick
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; values were shifted to the right to be identical).
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; values were shifted to the right to be identical).
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; Why are there two bits indicating a pressed trigger?
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; Why are there two bits indicating a pressed trigger?
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; According to the "Second book of programs for the Dick Smith Wizard"
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; According to the "Second book of programs for the Dick Smith Wizard"
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; (pg. 88ff), the left hand fire button gives the value of
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; (pg. 88ff), the left hand fire button gives the value of
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; %00010001 and the right hand button gives %00100010
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; %00010001 and the right hand button gives %00100010
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; Why two bits? Am I missing something? Can there be cases that just
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; Why two bits? Can there be cases that just one of those bits is set?
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; one of those bits is set?
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; Until these questions have been answered, we only use the lower two
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; We just test if any of those two bits is not zero...
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; bits and ignore the upper ones...
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tay
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and #%00000011 ; button status came in in A, strip high bits
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and #%00010001
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sta retval ; initialize 'retval' with button status
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beq cnv_1
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inc retval ; left button pressed
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cnv_1: tya
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and #%00100010
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beq cnv_2
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lda #$02
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ora retval
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sta retval ; right button pressed
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; ------
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; ------
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; direction:
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; direction:
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cnv_2: txa
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; CV has a 16-direction joystick
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; tested with https://sourceforge.net/projects/creativisionemulator
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;
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; $49 - %01001001 - up
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; port values: (compass points)
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; $41 - %01000001 - down
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; N - $49 - %01001001
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; $4D - %01001101 - left
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; NNE - $48 - %01001000
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; $45 - %01000101 - right
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; NE - $47 - %01000111
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;
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; ENE - $46 - %01000110
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; are these correct? "Second book of programs for the Dick Smith Wizard" pg. 85 says something different
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; E - $45 - %01000101
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; ignored for now...
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; ESE - $44 - %01000100
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; $85 - %10000101 - up + right
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; SE - $43 - %01000011
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; $8D - %10001101 - down + left
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; SSE - $42 - %01000010
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; $89 - %10001001 - up + left
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; S - $41 - %01000001
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; $85 - %10000101 - down + right (emulator bug?)
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; SSW - $40 - %01000000
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; SW - $4F - %01001111
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; WSW - $4E - %01001110
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; W - $4D - %01001101
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; WNW - $4C - %01001100
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; NW - $4B - %01001011
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; NNW - $4A - %01001010
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; center - $00 - %00000000
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;
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; mapping to cc65 definitions (4-direction joystick with 8 possible directions thru combinations)
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; N, E, S, W -> JOY_UP, JOY_RIGHT, JOY_DOWN, JOY_LEFT
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; NE, SE, SW, NW -> (JOY_UP | JOY_RIGHT), (JOY_DOWN | JOY_RIGHT), (JOY_DOWN | JOY_LEFT), (JOY_UP | JOY_LEFT)
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; NNE, ENE, ESE, SSE, SSW, WSW, WNW, NNW:
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; toggle between straight and diagonal direction for every call, e.g.
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; NNE:
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; call to READJOY: return JOY_UP | JOY_RIGHT
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; call to READJOY: return JOY_UP
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; call to READJOY: return JOY_UP | JOY_RIGHT
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; call to READJOY: return JOY_UP
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; call to READJOY: return JOY_UP | JOY_RIGHT
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; etc...
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bit testbit ; bit #0 set?
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txa ; move direction status into A
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beq done ; no, no direction
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beq done ; center position (no bits are set), nothing to do
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and #%00001100 ; mask out other bits
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and #$0F ; get rid of the "$40" bit
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lsr a
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bit bit0 ; is it a "three letter" direction (NNE, ENE, etc.)?
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lsr a
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beq special ; yes (bit #0 is zero)
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lsr a ; create index into table
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tax
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tax
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lda #%00000100 ; init bitmask
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lda dirtable,x
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loop: dex
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done: ora retval ; include "button" bits
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bmi done2
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ldx #0
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asl a
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bne loop
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done2: ora retval
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rts
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rts
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done: lda retval
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; NNE, ENE, ESE, SSE, SSW, WSW, WNW, NNW
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rts
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special: lsr a
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tax
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lda toggler ; toggle the toggler
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eor #$01
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sta toggler
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bne spec_1 ; toggler is 1, use spectable_1 entry
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lda spectable_0,x ; toggler is 0, use spectable_0 entry
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bne done ; jump always
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spec_1: lda spectable_1,x
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bne done ; jump always
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; ------------------------------------------------------------------------
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; ------------------------------------------------------------------------
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;
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;
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.data
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.rodata
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testbit:.byte $01
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; a mapping table of "port values" to "cc65 values"
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; port value had been shifted one bit to the right (range 0..7)
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dirtable: .byte JOY_DOWN ; S
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.byte JOY_DOWN | JOY_RIGHT ; SE
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.byte JOY_RIGHT ; E
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.byte JOY_UP | JOY_RIGHT ; NE
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.byte JOY_UP ; N
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.byte JOY_UP | JOY_LEFT ; NW
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.byte JOY_LEFT ; W
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.byte JOY_DOWN | JOY_LEFT ; SW
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; two "special" mapping tables for three-letter directions (NNE, etc.)
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spectable_0: .byte JOY_DOWN ; SSW
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.byte JOY_DOWN ; SSE
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.byte JOY_RIGHT ; ESE
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.byte JOY_RIGHT ; ENE
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.byte JOY_RIGHT ; NNE
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.byte JOY_UP ; NNW
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.byte JOY_LEFT ; WNW
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.byte JOY_LEFT ; WSW
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spectable_1: .byte JOY_DOWN | JOY_LEFT ; SSW
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.byte JOY_DOWN | JOY_RIGHT ; SSE
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.byte JOY_DOWN | JOY_RIGHT ; ESE
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.byte JOY_UP | JOY_RIGHT ; ENE
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.byte JOY_UP | JOY_RIGHT ; NNE
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.byte JOY_UP | JOY_LEFT ; NNW
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.byte JOY_UP | JOY_LEFT ; WNW
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.byte JOY_DOWN | JOY_LEFT ; WSW
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; ------------------------------------------------------------------------
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;
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bit0: .byte $01
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; ------------------------------------------------------------------------
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; ------------------------------------------------------------------------
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;
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;
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.bss
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.bss
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retval: .res 0
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toggler: .res 1
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retval: .res 1
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.end
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