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Line 129: − + − + − − 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.
→Camera registers
* Photo Dojo (DSiWare)
* Photo Dojo (DSiWare)
== Camera registers ==
== Camera registers (ARM7) ==
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 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"
| 4
| 4
| REG_CAMDATA
| REG_CAMDATA
|-
| 0x04004210
| 4
| REG_CAM_?
|-
| 0x04004214
| 4
| REG_CAM_?
|}
|}
|}
|}
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 ===
|-
|-
| 5
| 5
| Resets cameras/DSP when set?
| Resets cameras when set?
|-
|-
| 7-6
| 7-6
|-
|-
| 10
| 10
| Set to 1 during init, 0 on cameras/DSP shutdown
| 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
|}
|}
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 ===
|-
|-
| 31-0
| 31-0
| RGB555 video data converted by DSP
| 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)
== See also ==
== See also ==