Cameras
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The Nintendo DSi contains two cameras. The cameras can be used in the Nintendo DSi Camera application or DSi games that are compatible.
Specifications
- 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/DSP.
REG_CAMCNT
| BIT | DESCRIPTION |
|---|---|
| 0-3 | ? |
| 4 | ? |
| 5 | Resets cameras/DSP 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/DSP shutdown |
| 11 | Set to 1 during init, 0 on cameras/DSP shutdown |
| 12 | ? |
| 13 | Set during initialization? |
| 14 | Cleared during initialization? |
| 15 | Enable |
REG_CAMDATA
| BIT | DESCRIPTION |
|---|---|
| 31-0 | RGB555 video data converted by DSP |
For retrieving camera video data, NDMA with arm9 startup mode 11(camera) is used with this src register. Transfer lengths used are 0x18000 and 0x96000. The former is 256x192(actual camera resolution to final video data resolution conversion is handled by DSP) and the latter is 640x480.
The DSP fw binary still seems to be loaded after cameras were used in the exploited title, as reading this register(with cameras reinitialized prior to that) results in changing data rather than fixed data. The DSP is a proprietary CEVA DSP, since this ISA is proprietary fw binaries can't be compiled for it. Thus homebrew could potentially only use cameras when the exploited title can use cameras and cameras were used in the title prior to running hax.