Re: [Gumstix-users] How to change Register values of the Caspa FS

[Neil M. <ne...@gu...>]

On Wed, Oct 19, 2011 at 9:10 AM, es10m024 <es1...@te...> wrote:
>
> Hello.
>
> First, sry! My english is really bad.
>
> I'm using following HW:
> 1) Tobi Expansion Board
> 2) Camera: Caspa FS
> 3) Overo Air COM
>
> I used these instructions for setting up the Gumstix
> "http://paparazzi.enac.fr/wiki/Dev/Caspa"
> I'm able to capture frames with my own opencv programs. But i want to change
> the values of the Caspa FS registers. Honestly, i don't know how to set or
> get the values of the registers. And i want to trigger the Capture process
> myself, but i don't know how to do it!
> Caspa FS is using a Aptina 1/3 inch wide VGA CMOS Digital image sensor.
> Datasheet: "http://www.1stvision.com/cameras/sensor_specs/MT9V032_DS_D.pdf"
> The Sensor is snapshot able => But they do not mention how to set this Mode?
>
> I have searched for answers (different forums and internet sites), but no
> post or forum explains how to set or get the register values.
>
> My Questions:
> 1) Which API i need for setting the snapshot mode (??v4l2??)?
> 2) How to set and get value of the sensor register?
> 3) How to work with the mt9v032 driver?
> 4) How to trigger a capture process on my own?
>

Unfortunately, snapshot mode requires access to the exposure pin which
is unavailable on current Caspa models.

There are a number of workflows available for modifying the driver.
Scott Ellis has an excellent article to guide you here:
http://www.jumpnowtek.com/index.php?option=com_content&view=article&id=46&Itemid=54

Once the kernel has been patched, the driver you want is at
drivers/media/video/mt9v032.c

Hope this helps.

-
Neil