pokecrystal-board/engine/lcd.asm
2013-08-29 18:52:26 -04:00

82 lines
947 B
NASM

; LCD handling
Function547: ; 547
ld a, [hLCDStatCustom]
cp rSCX & $ff
ret nz
ld c, a
ld a, [LYOverrides]
ld [$ff00+c], a
ret
; 552
LCD: ; 552
push af
ld a, [hLCDStatCustom]
and a
jr z, .done
; At this point it's assumed we're in WRAM bank 5!
push bc
ld a, [rLY]
ld c, a
ld b, LYOverrides >> 8
ld a, [bc]
ld b, a
ld a, [hLCDStatCustom]
ld c, a
ld a, b
ld [$ff00+c], a
pop bc
.done
pop af
reti
; 568
DisableLCD: ; 568
; Turn the LCD off
; Don't need to do anything if the LCD is already off
ld a, [rLCDC]
bit 7, a ; lcd enable
ret z
xor a
ld [rIF], a
ld a, [rIE]
ld b, a
; Disable VBlank
res 0, a ; vblank
ld [rIE], a
.wait
; Wait until VBlank would normally happen
ld a, [rLY]
cp 145
jr nz, .wait
ld a, [rLCDC]
and %01111111 ; lcd enable off
ld [rLCDC], a
xor a
ld [rIF], a
ld a, b
ld [rIE], a
ret
; 58a
EnableLCD: ; 58a
ld a, [rLCDC]
set 7, a ; lcd enable
ld [rLCDC], a
ret
; 591