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Fixed bugs, updated docs in Apple 2 module paddle

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This commit is contained in:
Curtis F Kaylor 2020-04-27 12:41:16 -04:00
parent 58bc426886
commit 1986abf96a
2 changed files with 19 additions and 9 deletions
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19
include/apple2/paddle.a02
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@ -1,19 +1,28 @@
;Paddle Controller Constants and Functions for Apple II
PADDLS EQU #4 ;Maximum Numbers of Paddles
PADDLS EQU 4 ;Maximum Numbers of Paddles
;Read Paddle
;paddle(n) - Read Paddle n
;Args: A = Paddle Number (0-3)
;Returns: A, Y = Paddle Value (0-255)
; Carry Set if P
PADDLE: LDY #0 ;Set Result to 0
CMP #PADDLS ;If Paddle# >= Max
BCS PADDLZ ; Return # of Paddles & Carry Set
BCS PADDLZ ; Return 0 & Carry Set
TAX ;Copy Paddle# to X Register
JSR $FB1E ;Execute Monitor PREAD Routine
PADDLZ: TYA ;Copy Result to Accumulator
RTS
BUTTNS EQU #2 ;Maximum Numbers of Buttons
BUTTNS EQU 2 ;Maximum Numbers of Buttons
;Read Paddle Button
;button(n) - Read Paddle Button n
;Args: A = Button Number (0-1)
;Returns: A, Y = Button State
; 0 = Not Pressed
; $FF = Pressed
; X = Button Number
; Carry Set if P
BUTTON: LDY #0 ;Set Result to 0
CMP #BUTTNS ;If Button# >= Max
BCS BUTTOZ ; Return Zero & Carry Set

9
include/apple2/paddle.h02
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@ -3,10 +3,11 @@
#define PADDLS $04 //Number of Paddles
#define BUTTNS $02 //Number of Paddle Buttons
/* Get Paddle Button Status *
* Args: p = Paddle Number *
* Returns: $FF if Button Pressed *
* $00 if Not Pressed */
/* Get Paddle Button Status *
* Args: n = Button Number *
* Returns: char p = Button Status *
* $FF if Pressed *
* $00 if Not */
void button();
/* Get Paddle Status *