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ReadJoypad_:: ; c000 (3:4000)
; Poll joypad input.
; Unlike the hardware register, button
; presses are indicated by a set bit.
ld a, [hDisableJoypadPolling]
and a
ret nz
ld a, 1 << 5 ; select direction keys
;ld c, 0
ld [rJOYP], a
ld a, [rJOYP]
ld a, [rJOYP]
cpl
and %1111
swap a
ld b, a
ld a, 1 << 4 ; select button keys
ld [rJOYP], a
rept 6
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:: ; c02d (3:402d)
; hJoyReleased: (hJoyLast ^ hJoyInput) & hJoyLast
; hJoyPressed: (hJoyLast ^ hJoyInput) & hJoyInput
ld a, [hJoyInput]
ld b,a
and $4F
cp A_BUTTON + B_BUTTON + SELECT + START ; soft reset
jp z, TrySoftReset
ld a, [hJoyLast]
ld e, a
xor b
ld d, a
and e
ld [hJoyReleased], a
ld a, d
and b
ld [hJoyPressed], a
ld a, b
ld [hJoyLast], a
ld a, [wd730]
bit 5, a
jr nz, DiscardButtonPresses
ld a, [hJoyLast]
ld [hJoyHeld], a
ld a, [wJoyIgnore]
and a
ret z
cpl
ld b, a
ld a, [hJoyHeld]
and b
ld [hJoyHeld], a
ld a, [hJoyPressed]
and b
ld [hJoyPressed], a
ret
DiscardButtonPresses:
xor a
ld [hJoyHeld], a
ld [hJoyPressed], a
ld [hJoyReleased], a
ret
TrySoftReset:
call DelayFrame
; deselect (redundant)
ld a, $30
ld [rJOYP], a
ld hl, hSoftReset
dec [hl]
jp z, SoftReset
jp Joypad
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