N900 Hardware Flash Torch
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| - | =Hardware= | + | ==Hardware== |
| - | The flash torch on the [[Nokia N900|N900]] is a two LED flash, which has several modes. It can flash brightly for a maximum of 0. | + | |
| + | The flash torch on the [[Nokia N900|N900]] is a [http://www.analog.com/en/power-management/display-and-lighting/adp1653/products/product.html ADP1653] two LED flash, which has several modes. It can flash brightly for a maximum of 0.5 s, with an LED current of no more than 320 mA, or be in torch mode, at a current of no more than 50 mA. | ||
Exceeding these values will cause hardware damage. | Exceeding these values will cause hardware damage. | ||
| - | The brightness of the LED in flashlight mode is approximately | + | The brightness of the LED in flashlight mode is approximately 20 lux at 1 m at the brightest spot in the beam. |
It also contains a red indicator light, to indicate video is being recorded. | It also contains a red indicator light, to indicate video is being recorded. | ||
| - | =Software= | + | |
| + | ==Software== | ||
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(See kernel source ./arch/arm/mach-omap2/board-rx51-camera.c for details) | (See kernel source ./arch/arm/mach-omap2/board-rx51-camera.c for details) | ||
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This is used by the built-in camera application, and a [https://garage.maemo.org/projects/flashlight-appl/ third party flashlight application], as well as being controllable by a [http://maemo.org/packages/view/lfocus/ live focus application which can also control the LEDs]. | This is used by the built-in camera application, and a [https://garage.maemo.org/projects/flashlight-appl/ third party flashlight application], as well as being controllable by a [http://maemo.org/packages/view/lfocus/ live focus application which can also control the LEDs]. | ||
| - | + | [[Category:N900 Hardware]] | |
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[[Category:N900]] | [[Category:N900]] | ||
Revision as of 13:33, 10 June 2010
Hardware
The flash torch on the N900 is a ADP1653 two LED flash, which has several modes. It can flash brightly for a maximum of 0.5 s, with an LED current of no more than 320 mA, or be in torch mode, at a current of no more than 50 mA.
Exceeding these values will cause hardware damage.
The brightness of the LED in flashlight mode is approximately 20 lux at 1 m at the brightest spot in the beam.
It also contains a red indicator light, to indicate video is being recorded.
Software
(See kernel source ./arch/arm/mach-omap2/board-rx51-camera.c for details)
The controls of the device are apparently presented as video4linux ioctls related to the main camera device - /dev/video0 usually, and should show up in a suitable 'webcam' type viewer that can show arbitrary video4linux controls.
The driver is in drivers/media/video/adp1653.c
This is used by the built-in camera application, and a third party flashlight application, as well as being controllable by a live focus application which can also control the LEDs.