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ReadJoypad::
; Poll joypad input.
; Unlike the hardware register, button
; presses are indicated by a set bit.
ld a, 1 << 5 ; select direction keys
ld c, 0
ld [rJOYP], a
rept 6
ld a, [rJOYP]
endr
cpl
and %1111
swap a
ld b, a
ld a, 1 << 4 ; select button keys
ld [rJOYP], a
rept 10
ld a, [rJOYP]
endr
cpl
and %1111
or b
ld [hJoyInput], a
ld a, 1 << 4 + 1 << 5 ; deselect keys
ld [rJOYP], a
ret
Joypad::
; Update the joypad state variables:
; [hJoyReleased] keys released since last time
; [hJoyPressed] keys pressed since last time
; [hJoyHeld] currently pressed keys
homecall _Joypad
ret
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