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61 lines
828 B
NASM
61 lines
828 B
NASM
_Joypad::
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; hJoyReleased: (hJoyLast ^ hJoyInput) & hJoyLast
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; hJoyPressed: (hJoyLast ^ hJoyInput) & hJoyInput
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ld a, [hJoyInput]
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cp A_BUTTON + B_BUTTON + SELECT + START ; soft reset
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jp z, TrySoftReset
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ld b, a
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ld a, [hJoyLast]
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ld e, a
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xor b
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ld d, a
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and e
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ld [hJoyReleased], a
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ld a, d
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and b
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ld [hJoyPressed], a
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ld a, b
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ld [hJoyLast], a
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ld a, [wd730]
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bit 5, a
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jr nz, DiscardButtonPresses
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ld a, [hJoyLast]
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ld [hJoyHeld], a
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ld a, [wJoyIgnore]
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and a
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ret z
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cpl
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ld b, a
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ld a, [hJoyHeld]
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and b
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ld [hJoyHeld], a
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ld a, [hJoyPressed]
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and b
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ld [hJoyPressed], a
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ret
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DiscardButtonPresses:
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xor a
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ld [hJoyHeld], a
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ld [hJoyPressed], a
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ld [hJoyReleased], a
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ret
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TrySoftReset:
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call DelayFrame
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; deselect (redundant)
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ld a, $30
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ld [rJOYP], a
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ld hl, hSoftReset
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dec [hl]
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jp z, SoftReset
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jp Joypad
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