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