Game Boy Color >> Assembly
VBLANK
參考資訊：
1. bgb
2. rgbds
3. gambatte
4. DMGreport
暫存器
main.s
SCX equ $ff43
IE equ $ffff
IEF_VBLANK equ %00000001
LCDC equ $ff40
LCDCF_ON equ %10000000
section "vblank", rom0[$0040]
reti
section "lcdc", rom0[$0048]
reti
section "timer", rom0[$0050]
reti
section "serial", rom0[$0058]
reti
section "joypad", rom0[$0060]
reti
section "entry", rom0[$0100]
nop
jp _start
section "header", rom0[$0104]
db $ce, $ed, $66, $66, $cc, $0d, $00, $0b, $03, $73, $00, $83, $00, $0c, $00, $0d
db $00, $08, $11, $1f, $88, $89, $00, $0e, $dc, $cc, $6e, $e6, $dd, $dd, $d9, $99
db $bb, $bb, $67, $63, $6e, $0e, $ec, $cc, $dd, $dc, $99, $9f, $bb, $b9, $33, $3e
db "0123456789abcde"
db $80
db 0, 0
db 0
db 0
db 0
db 0
db 1
db $33
db 0
db 0
dw 0
_start:
di
ld sp, $ffff
ld a, IEF_VBLANK
ld [IE], a
ei
ld d, 32
ld bc, tile
ld hl, $8000
copy_tile:
ld a, [bc]
ld [hl+], a
inc bc
dec d
jr nz, copy_tile
ld b, 0
ld hl, color
copy_palette:
ld a, b
ld [$ff68], a
ld a, [hl]
ld [$ff69], a
inc hl
inc b
ld a, b
cp 8
jr nz, copy_palette
ld a, 1
ld [$9800], a
loop:
halt
ld a, [SCX]
inc a
ld [SCX], a
jp loop
color:
dw $7fff
dw $001f
dw $03e0
dw $7c00
tile:
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
db %11111111
db %00000000
執行halt指令後，CPU進入省電模式，待VBLANK中斷發生後，才繼續往下執行，每發一次VBLANK中斷，移動x捲軸一次
完成
