Cameras: Difference between revisions

← Older edit

@@ Line 6: / Line 6: @@
 [[Image:DSiCameraSampleImage.jpg|200px|thumb|right|A picture taken with the DSi's camera.]]
+Aptina MT9V113
 * 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 ==
@@ Line 25: / Line 26: @@
 * Classic Word Games
 * Cooking Coach
+* Foto Showdown (DSi Exclusive)
 * Pop SuperStar : Road To Celebrity (DSiWare)
 * Real Football 2009  (DSiWare)
@@ Line 33: / Line 35: @@
 * Photo Dojo (DSiWare)
-== Camera registers ==
+=== Homebrew ===
+* [[dsi-camera]]
+* [[dsidl]]
+== Camera registers (ARM7) ==
+The cameras are controlled and initialized with [[I2C_Bus#Cameras|I2C Bus]] on ARM7 side.
+== Camera registers (ARM9) ==
-The cameras are controlled and initialized with [[I2C_Bus#Cameras|I2C]]. The below registers are accessed by the arm9.
+The actual data transfers are done on ARM9 side with below registers.
 {| class="wikitable" border="1"
@@ Line 45: / Line 55: @@
 |  0x04004200
 |  2
-|  REG_CAMUNK
+|  REG_CAM_MCNT
 |-
 |  0x04004202
 |  2
-|  REG_CAMCNT
+|  REG_CAM_CNT
 |-
 |  0x04004204
 |  4
-|  REG_CAMDATA
+|  REG_CAM_DATA
+|-
+|  0x04004210
+|  4
+|  REG_CAM_SOFS
+|-
+|  0x04004214
+|  4
+|  REG_CAM_EOFS
 |}
-=== REG_CAMUNK ===
+=== REG_CAM_MCNT ===
 {| class="wikitable" border="1"
 |-
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 !  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. Once cameras are reset by poking this register, all three 0x0400420X camera registers are set to zero.
 === REG_CAMCNT ===
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 !  DESCRIPTION
 |-
-| 13-0
+| 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
-| Frame transfer enable
+| data transfer enable
 |}
+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 ===
 {| 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
-| Video data
+| Second pixel's alpha (always 1)
 |}
-For retrieving camera video data, [[NDMA]] with arm9 startup mode 11(camera) is used with this src register. Transferred length varies per resolution. In the video data, each pixel is 2 bytes.
+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 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 ==