Reading joysticks new to coleco programming

[MrDave]

Does anyone have advice on joystick reading ? 

I tried a call %1105

Followed by a call &1feb.  I dont see any activity on on table pointed to by Ix..  i think i am missing something in the init

Edited February 8, 2023 by MrDave

[Tony Cruise]

To read the joystick I use the following wrapper methods:

CONTROLLER_INIT:  EQU $1105
CONTROLLER_SCAN:  EQU $1f76
DECODER:          EQU $1f79
POLLER:           EQU $1feb

; To be added together for CONTROLLER_MAP +0 (player 1),
; and +1 (player 2)
CONTROLLER_ENABLE:  EQU 80h
KEYPAD_ENABLE:      EQU 10h
ARM_BUTTON_ENABLE:  EQU 8
JOYSTICK_ENABLE:    EQU 2
FIRE_BUTTON_ENABLE: EQU 1

;
; Controller Table offsets
PLAYER1:    EQU 0 ; Settings (above)
PLAYER2:    EQU 1
FIRE1:      EQU 2 ; Fire button 1 (40h=yes, 0=no)
JOY1:       EQU 3 ; 1=N, 2=E, 4=S, 8=W, etc.
SPIN1:      EQU 4 ; counter
ARM1:       EQU 5 ; Arm button 1 (40h=yes, 0=no)
KEYPAD1:    EQU 6 ; 0-9, '*'=10, '#'=11
FIRE2:      EQU 7
JOY2:       EQU 8
SPIN2:      EQU 9
ARM2:       EQU 10
KEYPAD2:    EQU 11


; Test for the press of a joystick button (0 or 1)
; A = 255 - fire button pressed
JOYTST:
    LD A,(CONTROLLER_BUFFER+FIRE1)
    OR A
    JR Z,JOYTST2
    LD A,255
    RET
JOYTST2:
    LD A,(CONTROLLER_BUFFER+5)
    AND 040h
    RET Z
    LD A,255
    RET

; Test for a press of a keypad button
JOYPAD:
    LD A,(CONTROLLER_BUFFER+KEYPAD1)
    RET
;
; Test for the direction of joystick 0
; Result: A
JOYDIR:
       LD A,(CONTROLLER_BUFFER+JOY1)
       RET

CONTROLLER_BUFFER: DS 12 ; Pointer to hand controller input area

 

Before using you need to call CONTROLLER_INIT

	; Enable both joysticks, buttons, keypads
	LD	HL,09b9bh
	LD	(CONTROLLER_BUFFER),HL
	XOR A
	CALL CONTROLLER_INIT

 

And before your section of code where you want to read joystick inputs, call POLLER e.g.

	CALL POLLER
	CALL JOYDIR
	; A now has the joystick direction

 

Important notes:

- The CONTROLLER_BUFFER needs to be pointed to in your cartridge header e.g.

;
; Set ROM header
           ORG        8000h
;        --------------------------------------------
;           DB       0AAh,055h       ;Cartridge present:  Colecovision logo
           DB       055h,0AAh       ;Cartridge present:  skip logo, Colecovision logo
           DW       0000           ;Pointer to the sprite name table
           DW       0000           ;Pointer to the sprite order table
           DW       0000           ;Pointer to the working buffer for WR_SPR_NM_TBL
           DW       CONTROLLER_BUFFER ;Pointer to the hand controller input areas
           DW       START      ;Entry point to the user program
;****************************************************************

 

Make sure you also clear out the buffer before using it.

[MrDave]

Thanks ! I am reading your book on kindle lol..

So do i need to clear buffer before each read ? Also the ld hl, 09b9bh is that just &9B9B ?

Edited February 8, 2023 by MrDave

[MrDave]

Also.. are there  hardcopy's of your books ?

Thanks

[Tony Cruise]

5 minutes ago, MrDave said:

Thanks ! I am reading your book on kindle lol..

So do i need to clear buffer before each read ? Also the ld hl, 09b9bh is that just &9B9B ?

So no just clear the buffer once at start-up before you call CONTROLLER_INIT, then call POLLER and then one of the helper functions.

[Tony Cruise]

2 minutes ago, MrDave said:

Also.. are there  hardcopy's of your books ?

Thanks

Cote Gamers have sold out of the spiral print edition, although I do have a small number of signed copies (here in OZ so post can be a bit steep due to the book being 1.1kgs - see my website).

 

I am going to do a re-edit (as with controllers especially there are a couple of discoveries to ensure your game works on all platforms i.e. Phoenix) and release a new edition which I will release as an Amazon Print on Demand version, they now have hard back as a print option.  I am working on another book at the moment though, so it will be a few months before I get that done.  Completely re-written version of the Sprite and Tile editor will be coming out as well.

[MrDave]

Looking foward to your books...i stillcant read joys yet..

 

I put hl, &9B9B

Then call init

Then call poll..

 

But nothing in buffer...

I put buffer address in header ( ram &7050 ) as test

 

Still drawing a blank

[MrDave]

Ok deeper reading in your book ..i have it working..

I fixed the load 9b before the init

i saw from the book that the 9B 's must stay in the buffer...

 

works great now..

thanks

 

 

 

Edited February 9, 2023 by MrDave