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82 lines
960 B
NASM
82 lines
960 B
NASM
; LCD handling
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Function547:: ; 547
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; Unreferenced
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ld a, [hLCDCPointer]
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cp rSCX - $ff00
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ret nz
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ld c, a
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ld a, [LYOverrides]
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ld [$ff00+c], a
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ret
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; 552
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LCD:: ; 552
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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, LYOverrides >> 8
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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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; 568
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DisableLCD:: ; 568
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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 7, a ; lcd enable
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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 145
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jr nz, .wait
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ld a, [rLCDC]
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and %01111111 ; lcd enable off
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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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; 58a
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EnableLCD:: ; 58a
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ld a, [rLCDC]
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set 7, a ; lcd enable
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ld [rLCDC], a
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ret
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; 591
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