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
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.