mirror of https://github.com/pret/pokecrystal.git
215 lines
2.7 KiB
NASM
215 lines
2.7 KiB
NASM
Reset::
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di
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call MapSetup_Sound_Off
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xor a
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ldh [hMapAnims], a
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call ClearPalettes
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xor a
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ldh [rIF], a
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ld a, 1 ; VBlank int
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ldh [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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_Start::
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cp $11
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jr z, .cgb
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xor a
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jr .load
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.cgb
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ld a, $1
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.load
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ldh [hCGB], a
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ld a, $1
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ldh [hSystemBooted], a
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Init::
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di
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xor a
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ldh [rIF], a
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ldh [rIE], a
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ldh [rRP], a
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ldh [rSCX], a
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ldh [rSCY], a
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ldh [rSB], a
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ldh [rSC], a
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ldh [rWX], a
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ldh [rWY], a
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ldh [rBGP], a
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ldh [rOBP0], a
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ldh [rOBP1], a
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ldh [rTMA], a
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ldh [rTAC], a
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ld [WRAM1_Begin], a
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ld a, %100 ; Start timer at 4096Hz
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ldh [rTAC], a
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.wait
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ldh a, [rLY]
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cp LY_VBLANK + 1
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jr nz, .wait
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xor a
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ldh [rLCDC], a
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; Clear WRAM bank 0
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ld hl, WRAM0_Begin
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ld bc, WRAM0_End - WRAM0_Begin
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.ByteFill:
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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, .ByteFill
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ld sp, wStack
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; Clear HRAM
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ldh a, [hCGB]
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push af
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ldh a, [hSystemBooted]
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push af
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xor a
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ld hl, HRAM_Begin
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ld bc, HRAM_End - HRAM_Begin
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call ByteFill
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pop af
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ldh [hSystemBooted], a
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pop af
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ldh [hCGB], a
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call ClearWRAM
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ld a, 1
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ldh [rSVBK], a
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call ClearVRAM
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call ClearSprites
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call ClearsScratch
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ld a, BANK(WriteOAMDMACodeToHRAM)
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rst Bankswitch
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call WriteOAMDMACodeToHRAM
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xor a
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ldh [hMapAnims], a
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ldh [hSCX], a
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ldh [hSCY], a
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ldh [rJOYP], a
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ld a, $8 ; HBlank int enable
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ldh [rSTAT], a
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ld a, $90
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ldh [hWY], a
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ldh [rWY], a
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ld a, 7
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ldh [hWX], a
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ldh [rWX], a
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ld a, LCDC_DEFAULT ; %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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ldh [rLCDC], a
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ld a, CONNECTION_NOT_ESTABLISHED
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ldh [hSerialConnectionStatus], a
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farcall InitCGBPals
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ld a, HIGH(vBGMap1)
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ldh [hBGMapAddress + 1], a
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xor a ; LOW(vBGMap1)
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ldh [hBGMapAddress], a
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farcall 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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ldh a, [hCGB]
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and a
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jr z, .no_double_speed
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call NormalSpeed
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.no_double_speed
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xor a
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ldh [rIF], a
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ld a, %1111 ; VBlank, LCDStat, Timer, Serial interrupts
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ldh [rIE], a
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ei
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call DelayFrame
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predef InitSGBBorder ; SGB init
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call MapSetup_Sound_Off
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xor a
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ld [wMapMusic], a
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jp GameInit
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ClearVRAM::
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; Wipe VRAM banks 0 and 1
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ld a, 1
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ldh [rVBK], a
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call .clear
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xor a ; 0
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ldh [rVBK], a
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.clear
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ld hl, VRAM_Begin
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ld bc, VRAM_End - VRAM_Begin
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xor a
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call ByteFill
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ret
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ClearWRAM::
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; Wipe swappable WRAM banks (1-7)
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; Assumes CGB or AGB
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ld a, 1
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.bank_loop
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push af
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ldh [rSVBK], a
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xor a
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ld hl, WRAM1_Begin
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ld bc, WRAM1_End - WRAM1_Begin
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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, .bank_loop ; Should be jr c
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ret
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ClearsScratch::
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; Wipe the first 32 bytes of sScratch
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ld a, BANK(sScratch)
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call GetSRAMBank
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ld hl, sScratch
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ld bc, $20
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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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