Difference between revisions of "Cameras"

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(document camera registers)
 
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[[Image:DSiCameraSampleImage.jpg|200px|thumb|right|A picture taken with the DSi's camera.]]
 
[[Image:DSiCameraSampleImage.jpg|200px|thumb|right|A picture taken with the DSi's camera.]]
 +
 +
Aptina MT9V113
  
 
* 0.3 Megapixel  
 
* 0.3 Megapixel  
 
* 640*480 VGA
 
* 640*480 VGA
 
* No zoom and no flash.
 
* No zoom and no flash.
−
* Photos saved in JPG format (saved in [[DCIM/]] folder on the SD/SDHC or in the internal memory)
 
  
 
== Applications/Games compatible ==
 
== Applications/Games compatible ==
Line 25: Line 26:
 
* Classic Word Games
 
* Classic Word Games
 
* Cooking Coach
 
* Cooking Coach
 +
* Foto Showdown (DSi Exclusive)
 
* Pop SuperStar : Road To Celebrity (DSiWare)
 
* Pop SuperStar : Road To Celebrity (DSiWare)
 
* Real Football 2009  (DSiWare)
 
* Real Football 2009  (DSiWare)
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* Photo Dojo (DSiWare)
 
* Photo Dojo (DSiWare)
  
−
== Camera registers ==
+
=== Homebrew ===
 +
* [[dsi-camera]]
 +
* [[dsidl]]
  
−
The cameras are controlled and initialized with [[I2C_Bus#Cameras|I2C]]. The below registers are accessed by the arm9.
+
== Camera registers (ARM7) ==
 +
 
 +
The cameras are controlled and initialized with [[I2C_Bus#Cameras|I2C Bus]] on ARM7 side.
 +
 
 +
== Camera registers (ARM9) ==
 +
 
 +
The actual data transfers are done on ARM9 side with below registers.
  
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
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|  0x04004200
 
|  0x04004200
 
|  2
 
|  2
−
|  REG_CAMRST
+
|  REG_CAM_MCNT
 
|-
 
|-
 
|  0x04004202
 
|  0x04004202
 
|  2
 
|  2
−
|  REG_CAMCNT
+
|  REG_CAM_CNT
 
|-
 
|-
 
|  0x04004204
 
|  0x04004204
 
|  4
 
|  4
−
|  REG_CAMDATA
+
|  REG_CAM_DATA
 +
|-
 +
|  0x04004210
 +
|  4
 +
|  REG_CAM_SOFS
 +
|-
 +
|  0x04004214
 +
|  4
 +
|  REG_CAM_EOFS
 
|}
 
|}
  
−
=== REG_CAMRST ===
+
=== REG_CAM_MCNT ===
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
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!  DESCRIPTION
 
!  DESCRIPTION
 
|-
 
|-
−
| 15-0
+
| 15-8
−
| ?
+
| unused
 +
|-
 +
| 7
 +
| INI
 +
|-
 +
| 6
 +
| V28 rail enable
 +
|-
 +
| 5
 +
| VIO (1.8V IO voltage) rail enable
 +
|-
 +
| 4
 +
| V18 (1.8V core voltage) rail enable
 +
|-
 +
| 3
 +
| IRCLK
 +
|-
 +
| 2
 +
| SYNC
 +
|-
 +
| 1
 +
| RST
 +
|-
 +
| 0
 +
| STDBY
 
|}
 
|}
  
−
Used for resetting cameras/DSP. Once cameras/DSP are reset by poking this register, all three 0x0400420X camera registers return all-zero on reads. This might mean the DSP fw bin was unloaded?
+
Used for resetting cameras. Once cameras are reset by poking this register, all three 0x0400420X camera registers are set to zero.
  
 
=== REG_CAMCNT ===
 
=== REG_CAMCNT ===
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|-
 
|-
 
| 0-3
 
| 0-3
−
| ?
+
| NLINES
 
|-
 
|-
 
| 4
 
| 4
−
| IRQ error flag
+
| IRQ FIFO-error flag
 
|-
 
|-
 
| 5
 
| 5
−
| Resets cameras/DSP when set?
+
| flush
 
|-
 
|-
 
| 7-6
 
| 7-6
 
| ?
 
| ?
 
|-
 
|-
−
| 9-8
+
| 8-9
−
| Set to 2(bit9 set) during init, cleared to zero on shutdown
+
| IREQVS
 
|-
 
|-
 
| 10
 
| 10
−
| Set to 1 during init, 0 on cameras/DSP shutdown
+
| IREQBE: Set to 1 during init, 0 on cameras shutdown
 
|-
 
|-
 
| 11
 
| 11
−
| Set to 1 during init, 0 on cameras/DSP shutdown
+
| IE: Set to 1 during init, 0 on cameras shutdown
 
|-
 
|-
 
| 12
 
| 12
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|-
 
|-
 
| 13
 
| 13
−
| Set during initialization?
+
| YUV2RGB
 
|-
 
|-
 
| 14
 
| 14
−
| Cleared during initialization?
+
| TRIMEN
 
|-
 
|-
 
| 15
 
| 15
−
| Enable
+
| data transfer enable
 
|}
 
|}
  
−
When the IRQ error flag is set when the cameras [[Interrupts|IRQ]] handler is executing, the cameras are shut off.
+
When the IRQ error flag is set when the cameras [[Interrupts|IRQ]] handler is executing, the cameras are shut off. The cameras I2C devices are powered off until cameras are initialized via this register.
  
 
=== REG_CAMDATA ===
 
=== REG_CAMDATA ===
 +
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
−
! BIT
+
!
−
! DESCRIPTION
+
! BIT
 +
! DESCRIPTION
 +
|-
 +
! rowspan=4 | YUV422
 +
| 0-7
 +
| First pixel's luminance (Y)
 +
|-
 +
| 8-15
 +
| Both pixels' blue (U)
 +
|-
 +
| 16-23
 +
| Second pixel's luminance (Y)
 +
|-
 +
| 24-31
 +
| Both pixels' red (V)
 +
|-
 +
! rowspan=8 | RGB555
 +
| 0-4
 +
| First pixel's red
 +
|-
 +
| 5-9
 +
| First pixel's green
 +
|-
 +
| 10-14
 +
| First pixel's blue
 +
|-
 +
| 15
 +
| First pixel's alpha (always 1)
 +
|-
 +
| 16-20
 +
| Second pixel's red
 +
|-
 +
| 21-25
 +
| Second pixel's green
 +
|-
 +
| 26-30
 +
| Second pixel's blue
 
|-
 
|-
−
| 31-0
+
| 31
−
| RGB555 video data converted by DSP
+
| Second pixel's alpha (always 1)
 
|}
 
|}
  
−
For retrieving camera video data, [[NDMA]] with arm9 startup mode 11(camera) is used with this src register. The NDMA frame transfer is started when the cameras [[Interrupts|IRQ]] was thrown. Supported DSP final resolutions are 256x192 and 640x480, the corresponding frame transfer lengths are 0x18000 and 0x96000.(The 256x192 final resolution is converted by the DSP from the camera resolution)
+
For retrieving camera video data, [[NDMA]] with arm9 startup mode 11(camera) is used with this src register. The NDMA frame transfer is started when the cameras [[Interrupts|IRQ]] was thrown. Supported internal-cameras DSP final resolutions are 256x192 and 640x480, the corresponding frame transfer lengths are 0x18000 and 0x96000. (The 256x192 final resolution is converted by the internal-cameras DSP from the camera resolution)
  
−
The DSP is a proprietary CEVA DSP, since this ISA is proprietary fw binaries can't be compiled for it. Thus homebrew can't use cameras unless it's possible to initialize cameras without poking REG_CAMRST,(which seems to unload the proprietary DSP fw bin) which might not be possible.
+
The video data can be transferred as the camera's native YUV422 for higher quality or automatically converted to the same RGB555 as the 2D engine bitmap format. No official program uses the YUV mode, but it has been used in the homebrew [[dsi-camera]].
  
 
== See also ==
 
== See also ==

Latest revision as of 20:03, 9 August 2023

This article is a stub. You can help DSiBrew by expanding it.

The Nintendo DSi contains two cameras. The cameras can be used in the Nintendo DSi Camera application or DSi games that are compatible.

Specifications

A picture taken with the DSi's camera.

Aptina MT9V113

  • 0.3 Megapixel
  • 640*480 VGA
  • No zoom and no flash.

Applications/Games compatible

Applications

Games

  • Asphalt 4 : Elite Racing (DSiWare)
  • Brain Challenge (DSiWare)
  • Classic Word Games
  • Cooking Coach
  • Foto Showdown (DSi Exclusive)
  • Pop SuperStar : Road To Celebrity (DSiWare)
  • Real Football 2009 (DSiWare)
  • WarioWare : Snapped! (DSiWare)
  • iCarly
  • Pokemon Black,White (2010,JP)
  • Castle of Magic (DSiWare)
  • Photo Dojo (DSiWare)

Homebrew

Camera registers (ARM7)

The cameras are controlled and initialized with I2C Bus on ARM7 side.

Camera registers (ARM9)

The actual data transfers are done on ARM9 side with below registers.

ADDRESS WIDTH NAME
0x04004200 2 REG_CAM_MCNT
0x04004202 2 REG_CAM_CNT
0x04004204 4 REG_CAM_DATA
0x04004210 4 REG_CAM_SOFS
0x04004214 4 REG_CAM_EOFS

REG_CAM_MCNT

BIT DESCRIPTION
15-8 unused
7 INI
6 V28 rail enable
5 VIO (1.8V IO voltage) rail enable
4 V18 (1.8V core voltage) rail enable
3 IRCLK
2 SYNC
1 RST
0 STDBY

Used for resetting cameras. Once cameras are reset by poking this register, all three 0x0400420X camera registers are set to zero.

REG_CAMCNT

BIT DESCRIPTION
0-3 NLINES
4 IRQ FIFO-error flag
5 flush
7-6 ?
8-9 IREQVS
10 IREQBE: Set to 1 during init, 0 on cameras shutdown
11 IE: Set to 1 during init, 0 on cameras shutdown
12 ?
13 YUV2RGB
14 TRIMEN
15 data transfer enable

When the IRQ error flag is set when the cameras IRQ handler is executing, the cameras are shut off. The cameras I2C devices are powered off until cameras are initialized via this register.

REG_CAMDATA

BIT DESCRIPTION
YUV422 0-7 First pixel's luminance (Y)
8-15 Both pixels' blue (U)
16-23 Second pixel's luminance (Y)
24-31 Both pixels' red (V)
RGB555 0-4 First pixel's red
5-9 First pixel's green
10-14 First pixel's blue
15 First pixel's alpha (always 1)
16-20 Second pixel's red
21-25 Second pixel's green
26-30 Second pixel's blue
31 Second pixel's alpha (always 1)

For retrieving camera video data, NDMA with arm9 startup mode 11(camera) is used with this src register. The NDMA frame transfer is started when the cameras IRQ was thrown. Supported internal-cameras DSP final resolutions are 256x192 and 640x480, the corresponding frame transfer lengths are 0x18000 and 0x96000. (The 256x192 final resolution is converted by the internal-cameras DSP from the camera resolution)

The video data can be transferred as the camera's native YUV422 for higher quality or automatically converted to the same RGB555 as the 2D engine bitmap format. No official program uses the YUV mode, but it has been used in the homebrew dsi-camera.

See also

Retrieved from "https://dsibrew.org/w/index.php?title=Cameras&oldid=2099856"