Difference between revisions of "Cameras"

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(Camera registers)
(removed CEVA DSP info for now since that doesn't seem to be used for cameras, until proven otherwise.)
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== Camera registers ==
 
== Camera registers ==
  
The cameras are controlled and initialized with [[I2C_Bus#Cameras|I2C]]. The below registers are accessed by the arm9.
+
The cameras are controlled and initialized with [[I2C_Bus#Cameras|I2C]]. The below registers are accessed by the ARM9.
  
 
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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?
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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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|-
 
|-
 
| 5
 
| 5
| Resets cameras/DSP when set?
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| Resets cameras when set?
 
|-
 
|-
 
| 7-6
 
| 7-6
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|-
 
|-
 
| 10
 
| 10
| Set to 1 during init, 0 on cameras/DSP shutdown
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| Set to 1 during init, 0 on cameras shutdown
 
|-
 
|-
 
| 11
 
| 11
| Set to 1 during init, 0 on cameras/DSP shutdown
+
| Set to 1 during init, 0 on cameras shutdown
 
|-
 
|-
 
| 12
 
| 12
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|}
 
|}
  
When the IRQ error flag is set when the cameras [[Interrupts|IRQ]] handler is executing, the cameras are shut off.
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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 ===
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|-
 
|-
 
| 31-0
 
| 31-0
| RGB555 video data converted by DSP
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| RGB555 video data converted by internal-cameras DSP
 
|}
 
|}
  
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.
 
  
 
== See also ==
 
== See also ==

Revision as of 09:08, 4 November 2011

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.
  • 0.3 Megapixel
  • 640*480 VGA
  • 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

  • Asphalt 4 : Elite Racing (DSiWare)
  • Brain Challenge (DSiWare)
  • Classic Word Games
  • Cooking Coach
  • 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)

Camera registers

The cameras are controlled and initialized with I2C. The below registers are accessed by the ARM9.

ADDRESS WIDTH NAME
0x04004200 2 REG_CAMRST
0x04004202 2 REG_CAMCNT
0x04004204 4 REG_CAMDATA

REG_CAMRST

BIT DESCRIPTION
15-0 ?

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 ?
4 IRQ error flag
5 Resets cameras when set?
7-6 ?
9-8 Set to 2(bit9 set) during init, cleared to zero on shutdown
10 Set to 1 during init, 0 on cameras shutdown
11 Set to 1 during init, 0 on cameras shutdown
12 ?
13 Set during initialization?
14 Cleared during initialization?
15 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
31-0 RGB555 video data converted by internal-cameras DSP

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)

See also