ref: 1b9540cc49f76626445d2cb5744be1e81c709ca8
dir: /engine/joypad.asm/
_Joypad:: ; hJoyReleased: (hJoyLast ^ hJoyInput) & hJoyLast ; hJoyPressed: (hJoyLast ^ hJoyInput) & hJoyInput ldh a, [hJoyInput] cp A_BUTTON + B_BUTTON + SELECT + START ; soft reset jp z, TrySoftReset ld b, a ldh a, [hJoyLast] ld e, a xor b ld d, a and e ldh [hJoyReleased], a ld a, d and b ldh [hJoyPressed], a ld a, b ldh [hJoyLast], a ld a, [wd730] bit 5, a jr nz, DiscardButtonPresses ldh a, [hJoyLast] ldh [hJoyHeld], a ld a, [wJoyIgnore] and a ret z cpl ld b, a ldh a, [hJoyHeld] and b ldh [hJoyHeld], a ldh a, [hJoyPressed] and b ldh [hJoyPressed], a ret DiscardButtonPresses: xor a ldh [hJoyHeld], a ldh [hJoyPressed], a ldh [hJoyReleased], a ret TrySoftReset: call DelayFrame ; deselect (redundant) ld a, $30 ldh [rJOYP], a ld hl, hSoftReset dec [hl] jp z, SoftReset jp Joypad