ref: 4ee4bf035129567b1e411f063a3cf2d9221ea0ea
dir: /constants/hardware_constants.asm/
; Graciously derived from:
; https://gbdev.io/pandocs/
; https://github.com/gbdev/hardware.inc
; http://gameboy.mongenel.com/dmg/asmmemmap.html
; memory map
DEF VRAM_Begin EQU $8000
DEF VRAM_End EQU $a000
DEF SRAM_Begin EQU $a000
DEF SRAM_End EQU $c000
DEF WRAM0_Begin EQU $c000
DEF WRAM0_End EQU $d000
DEF WRAM1_Begin EQU $d000
DEF WRAM1_End EQU $e000
; hardware registers $ff00-$ff80 (see below)
DEF HRAM_Begin EQU $ff80
DEF HRAM_End EQU $ffff
; MBC3
DEF MBC3SRamEnable EQU $0000
DEF MBC3RomBank EQU $2000
DEF MBC3SRamBank EQU $4000
DEF MBC3LatchClock EQU $6000
DEF MBC3RTC EQU $a000
DEF SRAM_DISABLE EQU $00
DEF SRAM_ENABLE EQU $0a
DEF NUM_SRAM_BANKS EQU 4
DEF RTC_S EQU $08 ; Seconds 0-59 (0-3Bh)
DEF RTC_M EQU $09 ; Minutes 0-59 (0-3Bh)
DEF RTC_H EQU $0a ; Hours 0-23 (0-17h)
DEF RTC_DL EQU $0b ; Lower 8 bits of Day Counter (0-FFh)
DEF RTC_DH EQU $0c ; Upper 1 bit of Day Counter, Carry Bit, Halt Flag
; Bit 0 Most significant bit of Day Counter (Bit 8)
; Bit 6 Halt (0=Active, 1=Stop Timer)
; Bit 7 Day Counter Carry Bit (1=Counter Overflow)
; interrupt flags
DEF VBLANK EQU 0
DEF LCD_STAT EQU 1
DEF TIMER EQU 2
DEF SERIAL EQU 3
DEF JOYPAD EQU 4
DEF IE_DEFAULT EQU (1 << SERIAL) | (1 << TIMER) | (1 << LCD_STAT) | (1 << VBLANK)
; OAM attribute flags
DEF OAM_TILE_BANK EQU 3
DEF OAM_OBP_NUM EQU 4 ; non CGB Mode Only
DEF OAM_X_FLIP EQU 5
DEF OAM_Y_FLIP EQU 6
DEF OAM_PRIORITY EQU 7 ; 0: OBJ above BG, 1: OBJ behind BG (colors 1-3)
; BG Map attribute flags
DEF PALETTE_MASK EQU %111
DEF VRAM_BANK_1 EQU 1 << OAM_TILE_BANK ; $08
DEF OBP_NUM EQU 1 << OAM_OBP_NUM ; $10
DEF X_FLIP EQU 1 << OAM_X_FLIP ; $20
DEF Y_FLIP EQU 1 << OAM_Y_FLIP ; $40
DEF PRIORITY EQU 1 << OAM_PRIORITY ; $80
; Hardware registers
DEF rJOYP EQU $ff00 ; Joypad (R/W)
DEF rSB EQU $ff01 ; Serial transfer data (R/W)
DEF rSC EQU $ff02 ; Serial Transfer Control (R/W)
DEF rSC_ON EQU 7
DEF rSC_CGB EQU 1
DEF rSC_CLOCK EQU 0
DEF rDIV EQU $ff04 ; Divider Register (R/W)
DEF rTIMA EQU $ff05 ; Timer counter (R/W)
DEF rTMA EQU $ff06 ; Timer Modulo (R/W)
DEF rTAC EQU $ff07 ; Timer Control (R/W)
DEF rTAC_ON EQU 2
DEF rTAC_4096_HZ EQU %00
DEF rTAC_262144_HZ EQU %01
DEF rTAC_65536_HZ EQU %10
DEF rTAC_16384_HZ EQU %11
DEF rIF EQU $ff0f ; Interrupt Flag (R/W)
DEF rNR10 EQU $ff10 ; Channel 1 Sweep register (R/W)
DEF rNR11 EQU $ff11 ; Channel 1 Sound length/Wave pattern duty (R/W)
DEF rNR12 EQU $ff12 ; Channel 1 Volume Envelope (R/W)
DEF rNR13 EQU $ff13 ; Channel 1 Frequency lo (Write Only)
DEF rNR14 EQU $ff14 ; Channel 1 Frequency hi (R/W)
DEF rNR21 EQU $ff16 ; Channel 2 Sound Length/Wave Pattern Duty (R/W)
DEF rNR22 EQU $ff17 ; Channel 2 Volume Envelope (R/W)
DEF rNR23 EQU $ff18 ; Channel 2 Frequency lo data (W)
DEF rNR24 EQU $ff19 ; Channel 2 Frequency hi data (R/W)
DEF rNR30 EQU $ff1a ; Channel 3 Sound on/off (R/W)
DEF rNR31 EQU $ff1b ; Channel 3 Sound Length
DEF rNR32 EQU $ff1c ; Channel 3 Select output level (R/W)
DEF rNR33 EQU $ff1d ; Channel 3 Frequency's lower data (W)
DEF rNR34 EQU $ff1e ; Channel 3 Frequency's higher data (R/W)
DEF rNR41 EQU $ff20 ; Channel 4 Sound Length (R/W)
DEF rNR42 EQU $ff21 ; Channel 4 Volume Envelope (R/W)
DEF rNR43 EQU $ff22 ; Channel 4 Polynomial Counter (R/W)
DEF rNR44 EQU $ff23 ; Channel 4 Counter/consecutive; Inital (R/W)
DEF rNR50 EQU $ff24 ; Channel control / ON-OFF / Volume (R/W)
DEF rNR51 EQU $ff25 ; Selection of Sound output terminal (R/W)
DEF rNR52 EQU $ff26 ; Sound on/off
DEF rWave_0 EQU $ff30
DEF rWave_1 EQU $ff31
DEF rWave_2 EQU $ff32
DEF rWave_3 EQU $ff33
DEF rWave_4 EQU $ff34
DEF rWave_5 EQU $ff35
DEF rWave_6 EQU $ff36
DEF rWave_7 EQU $ff37
DEF rWave_8 EQU $ff38
DEF rWave_9 EQU $ff39
DEF rWave_a EQU $ff3a
DEF rWave_b EQU $ff3b
DEF rWave_c EQU $ff3c
DEF rWave_d EQU $ff3d
DEF rWave_e EQU $ff3e
DEF rWave_f EQU $ff3f
DEF rLCDC EQU $ff40 ; LCD Control (R/W)
DEF rLCDC_BG_PRIORITY EQU 0 ; 0=Off, 1=On
DEF rLCDC_SPRITES_ENABLE EQU 1 ; 0=Off, 1=On
DEF rLCDC_SPRITE_SIZE EQU 2 ; 0=8x8, 1=8x16
DEF rLCDC_BG_TILEMAP EQU 3 ; 0=9800-9BFF, 1=9C00-9FFF
DEF rLCDC_TILE_DATA EQU 4 ; 0=8800-97FF, 1=8000-8FFF
DEF rLCDC_WINDOW_ENABLE EQU 5 ; 0=Off, 1=On
DEF rLCDC_WINDOW_TILEMAP EQU 6 ; 0=9800-9BFF, 1=9C00-9FFF
DEF rLCDC_ENABLE EQU 7 ; 0=Off, 1=On
DEF LCDC_DEFAULT EQU (1 << rLCDC_ENABLE) | (1 << rLCDC_WINDOW_TILEMAP) | (1 << rLCDC_WINDOW_ENABLE) | (1 << rLCDC_SPRITES_ENABLE) | (1 << rLCDC_BG_PRIORITY)
DEF rSTAT EQU $ff41 ; LCDC Status (R/W)
DEF rSCY EQU $ff42 ; Scroll Y (R/W)
DEF rSCX EQU $ff43 ; Scroll X (R/W)
DEF rLY EQU $ff44 ; LCDC Y-Coordinate (R)
DEF LY_VBLANK EQU 144
DEF rLYC EQU $ff45 ; LY Compare (R/W)
DEF rDMA EQU $ff46 ; DMA Transfer and Start Address (W)
DEF rBGP EQU $ff47 ; BG Palette Data (R/W) - Non CGB Mode Only
DEF rOBP0 EQU $ff48 ; Object Palette 0 Data (R/W) - Non CGB Mode Only
DEF rOBP1 EQU $ff49 ; Object Palette 1 Data (R/W) - Non CGB Mode Only
DEF rWY EQU $ff4a ; Window Y Position (R/W)
DEF rWX EQU $ff4b ; Window X Position minus 7 (R/W)
DEF rLCDMODE EQU $ff4c
DEF rKEY1 EQU $ff4d ; CGB Mode Only - Prepare Speed Switch
DEF rVBK EQU $ff4f ; CGB Mode Only - VRAM Bank
DEF rBLCK EQU $ff50
DEF rHDMA1 EQU $ff51 ; CGB Mode Only - New DMA Source, High
DEF rHDMA2 EQU $ff52 ; CGB Mode Only - New DMA Source, Low
DEF rHDMA3 EQU $ff53 ; CGB Mode Only - New DMA Destination, High
DEF rHDMA4 EQU $ff54 ; CGB Mode Only - New DMA Destination, Low
DEF rHDMA5 EQU $ff55 ; CGB Mode Only - New DMA Length/Mode/Start
DEF rRP EQU $ff56 ; CGB Mode Only - Infrared Communications Port
DEF rRP_LED_ON EQU 0
DEF rRP_RECEIVING EQU 1
DEF rRP_ENABLE_READ_MASK EQU %11000000
DEF rBGPI EQU $ff68 ; CGB Mode Only - Background Palette Index
DEF rBGPI_AUTO_INCREMENT EQU 7 ; increment rBGPI after write to rBGPD
DEF rBGPD EQU $ff69 ; CGB Mode Only - Background Palette Data
DEF rOBPI EQU $ff6a ; CGB Mode Only - Sprite Palette Index
DEF rOBPI_AUTO_INCREMENT EQU 7 ; increment rOBPI after write to rOBPD
DEF rOBPD EQU $ff6b ; CGB Mode Only - Sprite Palette Data
DEF rOPRI EQU $ff6c ; CGB Mode Only - Object Priority Mode
DEF rSVBK EQU $ff70 ; CGB Mode Only - WRAM Bank
DEF rPCM12 EQU $ff76 ; Channel 1 & 2 Amplitude (R)
DEF rPCM34 EQU $ff77 ; Channel 3 & 4 Amplitude (R)
DEF rIE EQU $ffff ; Interrupt Enable (R/W)