mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-06-08 06:29:32 +00:00
35377b5807
commit ed00e1d1b5a9783a72dade3f3676b161a9cfe287
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 22:20:49 2018 -0400
Documented joystk, paddle, and lgtpen modules
commit ec0a5ede8d1b043fcf0094ea653255a808dbf8d3
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 20:31:11 2018 -0400
Added joystick, paddle, and lightpen test programs
commit 7b787f432e2f4f7ae5d7f0053ade1d3586a4fad1
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 20:30:03 2018 -0400
Updated Apple II and VIC-20 Batch Files
commit 50568294349d7e3c6b7d0d364aeaece73c9e4ab6
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 20:28:09 2018 -0400
Separated light pen code into separate files
commit d45e59f73d55eef1d30c591d19a043ad79cfd81a
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 19:28:56 2018 -0400
Moved code for paddles into separate include files
commit fc5c5472d758c960332ea14105d5ec4a7c8cbbfb
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 16:15:32 2018 -0400
Added system specific module 'joystk'
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
;Paddle Controller Constants and Functions for VIC-20
|
|
|
|
PADDLS EQU #2 ;Maximum Numbers of Paddles
|
|
|
|
;Read Paddle
|
|
;Args: A = Paddle #
|
|
;Returns: A,Y = Paddle Value
|
|
; 0 and Carry Set if Paddle # Invalid
|
|
; X = Paddle #
|
|
PADDLE: LDY #0 ;Preset Result to 0
|
|
CMP #PADDLS ;If Paddle# >= # of Paddles
|
|
BCS PADDLZ ; Return Zero & Carry Set
|
|
TAX ;Copy Paddle # to X Register
|
|
LDY $9008,X ;Read Paddle
|
|
PADDLZ: TYA ;Copy Result to Accumulator
|
|
RTS
|
|
|
|
BUTTNS EQU #2 ;Maximum Numbers of Paddle Buttons
|
|
|
|
;Read Paddle Button
|
|
;Args: A = Button #
|
|
;Affects: Y
|
|
;Returns: A = $FF if Paddle Button Pressed
|
|
; $00 if Paddle Button Not Pressed
|
|
; Carry Set if Button Number Invalid
|
|
; X = Button #
|
|
BUTTON: CMP #2 ;If Button# >= # of Buttons
|
|
BCS BUTTOZ ; Return FALSE & Carry Set
|
|
TAX ;Copy Button Number to X Register
|
|
LDY BUTTOR,X ;Get Button Register Offset
|
|
LDA $9102,Y ;Read Data Direction Register
|
|
PHA ;and Save It
|
|
LDA #$00 ;Set Port to All Inputs
|
|
STA $9102,Y ;
|
|
LDA $9100,Y ;Read Button Port
|
|
AND BUTTOM,X ;and Isolate Bit
|
|
TAX ;Save Result in X
|
|
PLA ;Retrieve Original DDR Value
|
|
STA $9102,Y ;Restore Data Direction Register
|
|
TXA ;Get Result from X, Setting Flags
|
|
BNE BUTTOZ ;If Bit Not Set
|
|
LDA #$FF ; Return TRUE
|
|
RTS ;Else
|
|
BUTTOZ: LDA #$00 ; Return FALSE
|
|
RTS
|
|
;Paddle Buttons 0 = S2 ($9111 bit 4), 1 = S3 ($9120 bit 7)
|
|
BUTTOR: DC $11,$20 ;Paddle Button VIC Registers
|
|
BUTTOM: DC $10,$80 ;Paddle Button Bit Masks
|