「システム - パワーマネジメント」の編集履歴（バックアップ）一覧に戻る
システム - パワーマネジメント - (2007/06/18 (月) 08:45:07) のソース
POWER_CR (0x04000304:16) ARM9
bit name
15 LCD picker
14..10 -
9 Power 2D Core B
8 -
7..3 -
3 Power Geometry Engine
2 Power Rasterizer Engine
1 Power 2D Core A
0 Power screens
Bits marked - read as zero, and have no effect when written.
LCD picker:
* 0: 2D Core B displays on the top LCD, and 2D Core A on the bottom LCD.
* 1: 2D Core A displays on the top LCD, and 2D Core B on the bottom LCD.
Each power bit controls a single device:
* 0: off
* 1: on
POWER_CR (0x04000304:16) ARM7
bit name
15..2 Read as zero, writes ignored
1 Power Wifi
0 Power Speakers
Each power bit controls a single device:
* 0: off
* 1: on
There is also a power management IC on the ARM7 SPI bus. Commands:
0x00 Write control register
0x80 Read control register
You write the command, then the argument (or 0 for a read).
The format of the control register is:
7 Needs to be tested
6 DS power (0: on, 1: shut down!)
5..4 LED control
3 Top LCD backlight (0: off, 1: on)
2 Bottom LCD backlight (0: off, 1: on)
1 Volume slider (1: enabled, 0: disabled)
0 Power sound hardware (1: on, 0: off)
When the volume slider is disabled, sound output is at full volume.
HALT_CR (0x04000300:16)
bit name
15 ?
14 GBA mode (but aparently can't be set from user code)
1 Dunno
0 First boot bit maybe
Write HALT_CR with the BIOS appropriate bios function.
ARM9: 0003 retained with ffff write, 0001 always (write 0000 and it reads 0001)
ARM7: 8001 retained with ffff or 0000 write, hmm
PROTECTION_CR (0x1204) reads 0x1204, cannot be written to, so sad. (ARM7 bios writes 0x1205 to it, low bit must be latch and never allow to be modified)
