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77 lines
918 B
NASM
77 lines
918 B
NASM
; LCD handling
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Unreferenced_Function547::
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ld a, [hLCDCPointer]
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cp rSCX - $ff00
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ret nz
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ld c, a
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ld a, [wLYOverrides]
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ld [$ff00+c], a
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ret
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LCD::
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push af
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ld a, [hLCDCPointer]
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and a
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jr z, .done
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; At this point it's assumed we're in WRAM bank 5!
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push bc
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ld a, [rLY]
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ld c, a
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ld b, HIGH(wLYOverrides)
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ld a, [bc]
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ld b, a
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ld a, [hLCDCPointer]
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ld c, a
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ld a, b
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ld [$ff00+c], a
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pop bc
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.done
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pop af
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reti
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DisableLCD::
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; Turn the LCD off
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; Don't need to do anything if the LCD is already off
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ld a, [rLCDC]
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bit rLCDC_ENABLE, a
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ret z
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xor a
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ld [rIF], a
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ld a, [rIE]
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ld b, a
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; Disable VBlank
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res 0, a ; vblank
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ld [rIE], a
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.wait
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; Wait until VBlank would normally happen
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ld a, [rLY]
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cp LY_VBLANK + 1
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jr nz, .wait
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ld a, [rLCDC]
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and $ff ^ (1 << rLCDC_ENABLE)
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ld [rLCDC], a
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xor a
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ld [rIF], a
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ld a, b
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ld [rIE], a
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ret
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EnableLCD::
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ld a, [rLCDC]
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set rLCDC_ENABLE, a
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ld [rLCDC], a
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ret
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