mirror of https://github.com/pret/pokecrystal.git
223 lines
2.4 KiB
NASM
223 lines
2.4 KiB
NASM
Reset:: ; 150
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di
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call SoundRestart
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xor a
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ld [$ffde], a
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call ClearPalettes
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xor a
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ld [rIF], a
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ld a, 1 ; VBlank int
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ld [rIE], a
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ei
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ld hl, wcfbe
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set 7, [hl]
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ld c, 32
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call DelayFrames
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jr Init
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; 16e
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_Start:: ; 16e
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cp $11
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jr z, .asm_175
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xor a
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jr .asm_177
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.asm_175
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ld a, $1
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.asm_177
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ld [hCGB], a
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ld a, $1
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ld [$ffea], a
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; 17d
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Init:: ; 17d
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di
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xor a
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ld [rIF], a
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ld [rIE], a
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ld [rRP], a
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ld [rSCX], a
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ld [rSCY], a
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ld [rSB], a
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ld [rSC], a
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ld [rWX], a
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ld [rWY], a
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ld [rBGP], a
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ld [rOBP0], a
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ld [rOBP1], a
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ld [rTMA], a
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ld [rTAC], a
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ld [$d000], a
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ld a, %100 ; Start timer at 4096Hz
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ld [rTAC], a
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.wait
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ld a, [rLY]
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cp 145
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jr nz, .wait
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xor a
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ld [rLCDC], a
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; Clear WRAM bank 0
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ld hl, $c000
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ld bc, $d000 - $c000
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.asm_1b1
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ld [hl], 0
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inc hl
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dec bc
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ld a, b
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or c
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jr nz, .asm_1b1
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ld sp, Stack
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; Clear HRAM
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ld a, [hCGB]
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push af
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ld a, [$ffea]
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push af
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xor a
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ld hl, $ff80
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ld bc, $ffff - $ff80
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call ByteFill
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pop af
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ld [$ffea], a
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pop af
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ld [hCGB], a
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call ClearWRAM
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ld a, 1
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ld [rSVBK], a
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call ClearVRAM
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call ClearSprites
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call Function270
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ld a, BANK(LoadPushOAM)
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rst Bankswitch
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call LoadPushOAM
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xor a
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ld [$ffde], a
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ld [hSCX], a
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ld [hSCY], a
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ld [rJOYP], a
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ld a, $8 ; HBlank int enable
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ld [rSTAT], a
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ld a, $90
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ld [hWY], a
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ld [rWY], a
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ld a, 7
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ld [hWX], a
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ld [rWX], a
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ld a, %11100011
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; LCD on
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; Win tilemap 1
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; Win on
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; BG/Win tiledata 0
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; BG Tilemap 0
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; OBJ 8x8
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; OBJ on
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; BG on
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ld [rLCDC], a
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ld a, -1
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ld [$ffcb], a
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callba Function9890
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ld a, VBGMap1 / $100
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ld [hBGMapAddress + 1], a
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xor a ; VBGMap1 % $100
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ld [hBGMapAddress], a
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callba StartClock
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xor a
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ld [MBC3LatchClock], a
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ld [MBC3SRamEnable], a
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ld a, [hCGB]
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and a
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jr z, .asm_22b
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call NormalSpeed
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.asm_22b
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xor a
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ld [rIF], a
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ld a, %1111 ; VBlank, LCDStat, Timer, Serial interrupts
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ld [rIE], a
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ei
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call DelayFrame
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predef Function9853
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call SoundRestart
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xor a
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ld [wMapMusic], a
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jp GameInit
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; 245
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ClearVRAM:: ; 245
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; Wipe VRAM banks 0 and 1
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ld a, 1
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ld [rVBK], a
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call .clear
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xor a
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ld [rVBK], a
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.clear
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ld hl, VTiles0
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ld bc, $2000
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xor a
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call ByteFill
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ret
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; 25a
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ClearWRAM:: ; 25a
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; Wipe swappable WRAM banks (1-7)
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ld a, 1
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.asm_25c
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push af
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ld [rSVBK], a
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xor a
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ld hl, $d000
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ld bc, $1000
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call ByteFill
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pop af
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inc a
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cp 8
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jr nc, .asm_25c
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ret
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; 270
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Function270:: ; 270
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ld a, $0
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call GetSRAMBank
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ld hl, $a000
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ld bc, $0020
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xor a
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call ByteFill
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call CloseSRAM
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ret
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; 283
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