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#author("2023-05-24T00:01:51+09:00","","")
#author("2023-05-25T13:27:14+09:00","","")
* I/Oレジスタ [#hfd6c6db]
GBAはメモリを読み書きする感覚でハードウェアを操作することが可能です。アドレスは0x4000000から順次並んでいて、機能の順番としては「液晶ディスプレイ、サウンド、DMA(データ転送)、タイマー、SIO1(外部入出力)、キー入力、SIO2、その他」となっています。I/Oの意味を知ってしまえばGBAに何ができて、何が出来ないのかを理解したも当然です。1つ1つのビットの意味はGBATEKを参照してみることが大事になります。ただGBATEKは日本語の広辞苑というのか、辞書みたいなものなので頭から読むものではありません。必要になったら部分的に参照します。もしGBATEKが難しいと感じるようならば、このWikiのチュートリアルを一通りやれば自然と読み解く方法が身につくと思います。~
GBAは変数を読み書きする感覚でハードウェアを操作することが可能です。アドレスは0x4000000から順次並んでいて、機能の順番としては「液晶ディスプレイ、サウンド、DMA(データ転送)、タイマー、SIO1(外部入出力)、キー入力、SIO2、その他」となっています。I/Oの意味を知ってしまえばGBAに何ができて、何が出来ないのかを理解したも当然です。1つ1つのビットの意味はGBATEKを参照してみることが大事になります。ただGBATEKは日本語の広辞苑というか、辞書みたいなものなので頭から読むものではありません。必要になったら部分的に参照します。もしGBATEKが難しいと感じるようならば、このWikiのチュートリアルを一通りやれば自然と読み解く方法が身につくと思います。~
エミュレータは「Tools -> IO Viewer」で参照可能です。リアルタイムで変更できたりします。
#ref(1.png,nolink)
I/O Map
Forward
The base address for GBA I/O ports is 04000000h -
all address below are actually meant to be locat ed at 04000NNNh in memory rather than at NNNh.
LCD I/O Registers
000h R/W DISPCNT LCD Control
002h R/W - Undocumented - Green Swap
004h R/W DISPSTAT General LCD Status (STAT,LYC)
006h R VCOUNT Vertical Counter (LY)
008h R/W BG0CNT BG0 Control
00Ah R/W BG1CNT BG1 Control
00Ch R/W BG2CNT BG2 Control
00Eh R/W BG3CNT BG3 Control
010h W BG0HOFS BG0 X-Offset
012h W BG0VOFS BG0 Y-Offset
014h W BG1HOFS BG1 X-Offset
016h W BG1VOFS BG1 Y-Offset
018h W BG2HOFS BG2 X-Offset
01Ah W BG2VOFS BG2 Y-Offset
01Ch W BG3HOFS BG3 X-Offset
01Eh W BG3VOFS BG3 Y-Offset
020h W BG2PA BG2 Rotation/Scaling Parameter A (dx)
022h W BG2PB BG2 Rotation/Scaling Parameter B (dmx)
024h W BG2PC BG2 Rotation/Scaling Parameter C (dy)
026h W BG2PD BG2 Rotation/Scaling Parameter D (dmy)
028h-02Ah W BG2X BG2 Reference Point X-Coordinate
02Ch-02Eh W BG2Y BG2 Reference Point Y-Coordinate
030h W BG3PA BG3 Rotation/Scaling Parameter A (dx)
032h W BG3PB BG3 Rotation/Scaling Parameter B (dmx)
034h W BG3PC BG3 Rotation/Scaling Parameter C (dy)
036h W BG3PD BG3 Rotation/Scaling Parameter D (dmy)
038h-03Ah W BG3X BG3 Reference Point X-Coordinate
03Ch-03Eh W BG3Y BG3 Reference Point Y-Coordinate
040h W WIN0H Window 0 Horizontal Dimensions
042h W WIN1H Window 1 Horizontal Dimensions
044h W WIN0V Window 0 Vertical Dimensions
046h W WIN1V Window 1 Vertical Dimensions
048h R/W WININ Control Inside of Window(s)
04Ah R/W WINOUT Control Outside of Windows & Inside of OBJ Window
04Ch W MOSAIC Mosaic Size
04Eh - - Not used
050h R/W BLDCNT Color Special Effects Selection (formerly BLDMOD)
052h W BLDALPHA Alpha Blending Coefficients (formerly COLEV)
054h W BLDY Brightness (Fade-In/Out) Coefficient(formerly COLY)
056h-05Eh - - Not used
Sound Registers
060h R/W SOUND1CNT_L Channel 1 Sweep register (SG10_L)(NR10)
062h R/W SOUND1CNT_H Channel 1 Duty/Length/Envelope (SG10_H)(NR11, NR12)
064h R/W SOUND1CNT_X Channel 1 Frequency/Control (SG11) (NR13, NR14)
066h - - Not used -
068h R/W SOUND2CNT_L Channel 2 Duty/Length/Envelope (SG20) (NR21, NR22)
06Ah - - Not used -
06Ch R/W SOUND2CNT_H Channel 2 Frequency/Control (SG21) (NR23, NR24)
06Eh - - Not used -
070h R/W SOUND3CNT_L Channel 3 Stop/Wave RAM select (SG30_L)(NR30)
072h R/W SOUND3CNT_H Channel 3 Length/Volume (SG30_H)(NR31, NR32)
074h R/W SOUND3CNT_X Channel 3 Frequency/Control (SG31) (NR33, NR34)
076h - - Not used -
078h R/W SOUND4CNT_L Channel 4 Length/Envelope (SG40) (NR41, NR42)
07Ah - - Not used -
07Ch R/W SOUND4CNT_H Channel 4 Frequency/Control (SG41) (NR43, NR44)
07Eh - - Not used -
080h R/W SOUNDCNT_L Control Stereo/Volume/Enable (SGCNT0_L)(NR50, NR51)
082h R/W SOUNDCNT_H Control Mixing/DMA Control (SGCNT0_H)
084h R/W SOUNDCNT_X Control Sound on/off (SGCNT1) (NR52)
086h - - Not used
088h BIOS SOUNDBIAS Sound PWM Control (SG_BIAS)
08Ah-08Eh - - Not used
090h-09Eh R/W WAVE_RAM Channel 3 Wave Pattern RAM (2 banks!!) (SGWR)
0A0h-0A2h W FIFO_A Channel A FIFO, Data 0-3 (SGFIFOA)
0A4h-0A6h W FIFO_B Channel B FIFO, Data 0-3 (SGFIFOB)
0A8h-0AEh - - Not used
DMA Transfer Channels
0B0h-0B2h W DMA0SAD DMA 0 Source Address
0B4h-0B6h W DMA0DAD DMA 0 Destination Address
0B8h W DMA0CNT_L DMA 0 Word Count
0BAh R/W DMA0CNT_H DMA 0 Control
0BCh-0BEh W DMA1SAD DMA 1 Source Address
0C0h-0C2h W DMA1DAD DMA 1 Destination Address
0C4h W DMA1CNT_L DMA 1 Word Count
0C6h R/W DMA1CNT_H DMA 1 Control
0C8h-0CAh W DMA2SAD DMA 2 Source Address
0CCh-0CEh W DMA2DAD DMA 2 Destination Address
0D0h W DMA2CNT_L DMA 2 Word Count
0D2h R/W DMA2CNT_H DMA 2 Control
0D4h-0D6h W DMA3SAD DMA 3 Source Address
0D8h-0DAh W DMA3DAD DMA 3 Destination Address
0DCh W DMA3CNT_L DMA 3 Word Count
0DEh R/W DMA3CNT_H DMA 3 Control
0E0h-0FEh - - Not used
Timer Registers
100h R/W TM0CNT_L Timer 0 Counter/Reload (formerly TM0D)
102h R/W TM0CNT_H Timer 0 Control (formerly TM0CNT)
104h R/W TM1CNT_L Timer 1 Counter/Reload (formerly TM1D)
106h R/W TM1CNT_H Timer 1 Control (formerly TM1CNT)
108h R/W TM2CNT_L Timer 2 Counter/Reload (formerly TM2D)
10Ah R/W TM2CNT_H Timer 2 Control (formerly TM2CNT)
10Ch R/W TM3CNT_L Timer 3 Counter/Reload (formerly TM3D)
10Eh R/W TM3CNT_H Timer 3 Control (formerly TM3CNT)
110h-11Eh - - Not used
Serial Communication (1)
120h-122h R/W SIODATA32 SIO Data (Normal-32bit Mode) (shared with below!)
120h R/W SIOMULTI0 SIO Data 0 (Parent) (Multi-Player Mode) (SCD0)
122h R/W SIOMULTI1 SIO Data 1 (1st Child) (Multi-Player Mode) (SCD1)
124h R/W SIOMULTI2 SIO Data 2 (2nd Child) (Multi-Player Mode) (SCD2)
126h R/W SIOMULTI3 SIO Data 3 (3rd Child) (Multi-Player Mode) (SCD3)
128h R/W SIOCNT SIO Control Register (SCCNT_L)
12Ah R/W SIOMLT_SEND SIO Data (Local of Multi-Player) (shared below)
12Ah R/W SIODATA8 SIO Data (Normal-8bit and UART Mode) (SCCNT_H)
12Ch-12Eh - - Not used
Keypad Input
130h R KEYINPUT Key Status (formerly P1)
132h R/W KEYCNT Key Interrupt Control (formerly P1CNT)
Serial Communication (2)
134h R/W RCNT SIO Mode Select/General Purpose Data (formerly R)
136h - IR Ancient - Infrared Register (Prototypes only)
138h-13Eh - - Not used
140h R/W JOYCNT SIO JOY Bus Control (formerly HS_CTRL)
142h-14Eh - - Not used
150h-152h R/W JOY_RECV SIO JOY Bus Receive Data (formerly JOYRE)
154h-156h R/W JOY_TRANS SIO JOY Bus Transmit Data (formerly JOYTR)
158h R/? JOYSTAT SIO JOY Bus Receive Status (formerly JSTAT)
15Ah-1FEh - - Not used
Interrupt, Waitstate, and Power-Down Control
200h R/W IE Interrupt Enable Register
202h R/W IF Interrupt Request Flags / IRQ Acknowledge
204h R/W WAITCNT Game Pak Waitstate Control (formerly WSCNT)
206h - - Not used
208h R/W IME Interrupt Master Enable Register
20Ah-2FFh - - Not used
300h R/W HALTCNT Undocumented - Power Down Control
302h-40Fh - - Not used
410h ? ? Undocumented - Purpose Unknown ??? 0FFh
411h-7FFh - - Not used
800h-802h R/W ? Undocumented - Internal Memory Control (R/W)
804h-FFFFh - - Not used
** 履歴 [#me8f6046]
- 2023/04/12
- 2007/09/17
![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
