掌機 - Game Boy Color - Assembly - Palette(BG)



參考資訊:
https://bgb.bircd.org/
https://github.com/gbdev/rgbds
https://github.com/sinamas/gambatte
https://github.com/lancekindle/DMGreport

每個像素使用2bits表示(4個顏色)


每一個Palette有4個顏色可以設定,共有8個Palette可以使用


每個顏色由15bits組成


設定的方式則是透過BCPS(設定位址)、BCPD(設定資料)


main.s

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 a, 0
    ld [$ff68], a
    ld a, $1f
    ld [$ff69], a
    ld a, 1
    ld [$ff68], a
    ld a, $00
    ld [$ff69], a
    jp @

設定Palette0的第1組(共4組)顏色為0x001f(紅色),而預設開機的第1個Tile,內容都是0,因此,顯示為紅色

完成