mirror of
https://github.com/cc65/cc65.git
synced 2024-12-30 20:29:25 +00:00
31 lines
365 B
ArmAsm
31 lines
365 B
ArmAsm
|
;
|
||
|
|
; Christian Groessler
|
||
|
|
;
|
||
|
|
; unsigned readjoy (unsigned char joy);
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _readjoy
|
||
|
|
|
||
|
|
.include "atari.inc"
|
||
|
|
|
||
|
|
|
||
|
|
.proc _readjoy
|
||
|
|
|
||
|
|
and #3 ; fix joystick number
|
||
|
|
tax ; Joystick number (0-3) into X
|
||
|
|
|
||
|
|
; Read joystick
|
||
|
|
|
||
|
|
lda STRIG0,x ; get button
|
||
|
|
asl a
|
||
|
|
asl a
|
||
|
|
asl a
|
||
|
|
asl a
|
||
|
|
ora STICK0,x ; add position information
|
||
|
|
eor #$1F
|
||
|
|
ldx #0 ; fix X
|
||
|
|
rts
|
||
|
|
|
||
|
|
.endproc
|
||
|
|
|