LCD Registers

Registers

NAME	PHYSICAL ADDRESS	PROCESS VIRTUAL ADDRESS	KERNEL VIRTUAL ADDRESS	WIDTH
REG_LCDCOLORFILLMAIN	0x10202204	0x1ED02204	0xFFFD6204	4
REG_LCDCOLORFILLSUB	0x10202A04	0x1ED02A04	0xFFFD6A04	4

REG_*MAIN registers are used for the top LCD, while SUB is used for the bottom LCD. The registers for the main LCD is located at 0x1EF00400, while the sub LCD registers are located at 0x1EF00500.

REG_LCDCOLORFILL

Bit	Description
7-0	Red component intensity
15-8	Green component intensity
23-16	Blue component intensity
24	Enable
31-25	?

When the enable bit is set, the specified solid color is displayed on the LCD instead of the framebuffer.

0x1EF00X5C

Bit	Description
15-0	Framebuffer width
31-16	Framebuffer height

This controls the displayed LCD framebuffer dimensions.

0x1EF00X70

Bit	Description
15-0	Framebuffer format
31-16	?

Framebuffer format

Bit	Description
2-0	Color format
3	?
4	Unused?
5	Set when the main screen 3D right framebuffer address is set.
6	1 = main screen, 0 = sub screen. However if bit5 is set, this bit is cleared.
7	?
9-8	Value 1 = unknown: get rid of rainbow strip on top of screen, 3 = unknown: black screen.
15-10	Unused?

GSP module only allows the LCD stereoscopy to be enabled when bit5=1 and bit6=0 here. When GSP module updates this register, GSP module will automatically disable the stereoscopy if those bits are not set for enabling stereoscopy.

Framebuffer color formats

Value	Description	Actual color components ordering
0	GL_RGBA8_OES
1	GL_RGB8_OES	BGR
2	GL_RGB565_OES	RGB
3	GL_RGB5_A1_OES
4	GL_RGBA4_OES

0x1EF00X78

Bit	Description
0	LCD framebuffer to display (0=first, 1=second)
7-1	?
31-8	Unused

0x1EF00X90

Bit	Description
31-0	Framebuffer width * pixel byte-size.

Framebuffers

Process Virtual Address	Kernel Virtual Address	Physical Address	Description
0x1EF00468	0xFFFCE468	0x10400468	Main LCD, first framebuffer for 3D left
0x1EF0046C	0xFFFCE46C	0x1040046C	Main LCD, second framebuffer for 3D left
0x1EF00494	0xFFFCE494	0x10400494	Main LCD, first framebuffer for 3D right
0x1EF00498	0xFFFCE498	0x10400498	Main LCD, second framebuffer for 3D right
0x1EF00568	0xFFFCE568	0x10400568	Sub LCD, first framebuffer
0x1EF0056C	0xFFFCE56C	0x1040056C	Sub LCD, second framebuffer
0x1EF00594	0xFFFCE594	0x10400594	Sub LCD, unused first framebuffer
0x1EF00598	0xFFFCE598	0x10400598	Sub LCD, unused second framebuffer

The above framebuffer registers contains the physical address for each framebuffer, normally located in FCRAM in the application's GSP heap. When other processes use GSP as well, the framebuffers for the process is stored in VRAM instead.

These LCD framebuffers normally contain the last rendered frames from the GPU. The framebuffers are drawn from left-to-right, instead of top-to-bottom.(Thus the beginning of the framebuffer is drawn starting at the left side of the screen)

Both of the 3D screen left/right framebuffers are displayed regardless of the 3D slider's state, however when the 3D slider is set to "off" the 3D effect is disabled. Normally when the 3D slider's state is set to "off" the left/right framebuffer addresses are set to the same physical address. When the 3D effect is disabled and the left/right framebuffers are set to separate addresses, the LCD seems to alternate between displaying the left/right framebuffer each frame.