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Module joystk for x16emu Release 34
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Curtis F Kaylor
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;Joystick Constants and Functions
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;for Commander X16 Computer
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;Joystick Constants and Functions for Commander X16 Computer
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SUBR _JOYSTK
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JYSTKS EQU 2 ;Number of Joysticks
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.JYDATA EQU $02BC ;Joystick 0 Data
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.GETJOY EQU $FF06 ;Kernal GETJOY Routine
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.JYDATA EQU $02BC ;Joystick 0 Data
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;JOY1 JOY2
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;$02BC $02BF | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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; NES | A | B |SEL|STA|UP |DN |LT |RT |
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; SNES | B | Y |SEL|STA|UP |DN |LT |RT |
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;
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;$02BD $20C0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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; NES | 0 | 0 | 0 | 0 | 0 | 0 | 0 |KBD|
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; SNES | A | X | L | R | 1 | 1 | 1 | 1 |
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;
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;$02BE $02C1 $00 = joystick present
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; $FF = joystick not present
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;The Joystick Button is mapped to
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;A,B on the NES Controller and
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;A,B,X,Y on the SNES Controller
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;Select and Start are Ignored as Bits 4 and 5 of the return value
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;are always 0 because returning $FF means no controller found
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;Joystick Bit Masks
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JOYUP EQU $08 ;Up
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JOYDN EQU $04 ;Down
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JOYLF EQU $02 ;Left
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JOYRT EQU $01 ;Right
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JOYB0 EQU $80 ;Button
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JOYB0 EQU $C0 ;Button
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;Read Joystick
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JOYSTK: CMP #JYSTKS ;If Invalid Joystick Number
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BCS JOYSTE ; Return ERROR
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STA TEMP0 ;Save Joystick Number
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JSR $FF06 ;Call Kernal GETJOY Routine
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LDA TEMP0 ;Retrieve Joystick Number
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ASL ;Multiply it by 3
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ADC TEMP0 ;(Assumes Number<128)
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TAX ;and Copy to X-Register
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LDA $02BE,X ;If Controller Not Present
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BNE JOYSTE ; Return ERROR
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LDA $02BC,X ;Read Controller Status
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;EOR #$FF ;Invert Bits
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AND #$CF ;and Mask off Select/Start
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;Extended Bit Masks
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JOYBA EQU $80 ;A Button
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JOYBB EQU $40 ;B Button
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JOYSL EQU $20 ;Select
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JOYST EQU $10 ;Start
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JOYBL EQU $08 ;Left Button
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JOYBR EQU $04 ;Right Button
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JOYBX EQU $02 ;X Button
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JOYBY EQU $01 ;Y Button
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;Controller Types
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JOYKBD EQU $00 ;Keyboard (NES Emulation)
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JOYNES EQU $01 ;NES Controller
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JOYSNS EQU $02 ;SNS Controller
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;joytsk(j) - Read Joystick
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;Args: A = Joystick Number (0 or 1)
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;Sets: TEMP0 = Inverted Controller Status
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; TEMP1 = Inverted Extended Status
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; TEMP2 - Extended Result (Buttons)
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;Destroys: TEMP3
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;Returns: A = Joystick Status (Joystick Bit Masks
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; Y = Extended Status (Extended Bit Masks)
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; X = Controller Type (0=Keyboard, 1=NES, 2=SNES)
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JOYSTK: CMP #JYSTKS ;If Invalid Joystick Number
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BCS .JOYSTE ; Return ERROR
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STA TEMP0 ;Save Joystick Number
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BYTE $FF
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JOYSTL: WAI ;Wait for Interrupt
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LDA $9F27 ; Check Vera Interrupt Register
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AND #$01 ; If Not Vera Interrupt
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BEQ JOYSTL ; Loop
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JSR .GETJOY ;Call Kernal GETJOY Routine
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LDA TEMP0 ;Retrieve Joystick Number
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ASL ;Multiply it by 3
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ADC TEMP0 ;(Assumes Number<128)
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TAX ;and Copy to X-Register
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LDA .JYDATA+2,X ;If Controller Not Present
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BNE .JOYSTE ; Return ERROR
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LDA .JYDATA,X ;Get Base Status
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EOR #$FF ;Invert Bits
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JSR .JOYEXT ;Build Extended Results
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AND #$CF ;Mask off Select and Start
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.JOYSTX RTS
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;Return Error
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.JOYSTE LDA #$FF
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RTS
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JOYSTE: LDA #255 ;Return Error Code
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;Build Extended Result
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.JOYEXT STA TEMP0 ;Save Controller Status
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STZ TEMP3 ;Clear Button Mask
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LDA .JYDATA+1,X ;Get Extended Status
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BIT #$0E ;Check Bits 1 - 3
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BNE .JOYEXS ;If NES/Keyboard
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STA TEMP1 ; Save for Debugging
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EOR #$01 ; Invert Extended Bits
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TAX ; and Copy to X
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LDA TEMP0 ; Get Controller Status
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AND #$F0 ; Isolate Bits 4-7
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TAY ; and Copy Back to Y
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BRA .JOYEXX ;Else
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.JOYEXS JSR .JOYSNS ; Process SNES Buttons
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.JOYEXX LDA TEMP0 ;Restore Controller Status
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ORA TEMP3 ;Combine Buttons
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RTS
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;Process SNES Buttons
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.JOYSNS LDX #2 ;Set Controller Type to 2
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EOR #$FF ;Invert Extended Bits
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STA TEMP1 ; and Save Result
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AND #$C0 ;Isolate SNES A,X Buttons
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STA TEMP3 ;and Save in Button Mask
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LDA TEMP1 ;Retrieve Extended Buttons
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AND #$30 ;Isolate L and R
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ASL ;and Shift to Bits 2 and 3
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ASL
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BIT TEMP1 ;Get Ext Status High Bits
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BCC +2 ;If Extended Bit 7 was Set
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ORA #$80 ; Set Buttons Bit 7 (A)
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BVC +2 ;If Extended Bit 6 was Set
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ORA #$20 ; Set Buttons Bit 1 (X)
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STA TEMP2 ;Save Buttons A,X,L,R
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LDA TEMP0 ;Retrieve Controller Status
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AND #$30 ;Isolate Select and Start
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ORA TEMP2 ;Combine with A,X,L,R
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BIT TEMP2 ;Get Status High Bits
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BCC +2 ;If Status Bit 7 was Set
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ORA #$40 ; Set Buttons Bit 6 (B)
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BVC +2 ;If Status Bit 6 was Set
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ORA #$01 ; Set Buttons Nit 0 (Y)
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STA TEMP2 ;Save Buttons in TEMP2
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TAY ; and Copy to Y
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RTS
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@ -1,24 +1,43 @@
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/* Joystick Functions for *
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* Commander X-16 Computer */
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/* Joystick Functions for Commander X-16 Computer *
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* Supports Keyboard, NES, and SNES Controllers *
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* A and B on Keyboard and SNES Controller and *
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* A, B, X, Y on SNES Controller are all *
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* mapped to the joystick button JOYB0 *
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* Individual button status and Controller Type *
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* are returned as extended results */
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/* Keyboard to NES Controller Mappings *
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* Key: Ctrl Alt Space Enter Up Down Left Right *
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* NES: A B Select Start Up Down Left Right */
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#define JYSTKS 2 //Number of Joysticks
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//Joystick Result Bitmasks
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#define JOYUP $08 //Up
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#define JOYDN $04 //Down
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#define JOYLF $02 //Left
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#define JOYRT $01 //Right
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#define JOYB0 $80 //Button
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#define JOYB0 $C0 //Button
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char jydata[]; //Joystick Data
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//Extended Result Bitmasks
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#define JOYBA $80 //A Button
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#define JOYBB $40 //B Button
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#define JOYSL $20 //Select
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#define JOYST $10 //Start
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#define JOYBL $08 //Left Button
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#define JOYBR $04 //Right Button
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#define JOYBX $02 //X Button
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#define JOYBY $01 //Y Button
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/* Poll Joysticks` *
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* Sets: j = Joystick Number *
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* Returns: $FF = Error *
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* No Joysticks */
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void getjoy();
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//Controller Types
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#define JOYKBD $00 //Keyboard (NES Emulation)
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#define JOYNES $01 //NES Controller
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#define JOYSNS $02 //SNS Controller
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/* Read Joystick State *
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* Args: j = Joystick Number *
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* Returns: $FF = Error *
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* No Joysticks */
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/* Read Joystick Status *
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* Args: j = Joystick Number *
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* Returns: char j = Joystick Status *
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* $FF = Not Present *
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* char b = Extended Status *
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* char c = Controller Type */
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char joystk();
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