[Community] [Gta04-owner] [News] GTA04 Camera

[Denis Shulyaka]

This is a really great news! Now I regret I didn't participate in the
GTA04A4 group tour...

2013/4/9 Dr. H. Nikolaus Schaller <hns at goldelico.com>:
> Hi,
> the camera is finally starting to work!
>
> Here is a short video made with the GTA04 camera:
>
>         <http://youtu.be/lFWvVXThAGk>
>
> Quality is not yet optimized and exact frame position isn't as well.
>
> And the frame rate is quite limited by mplayer / mencoder running (unaccelerated?)
> on the GTA04.
>
> But I think we have reached a major milestone and I encourage to compile your own camera
> driver and let us all know about patches and improvements.
>
> Source of the V4L2 subdevice driver is here:
>
>         <http://git.goldelico.com/?p=gta04-kernel.git;a=blob;f=drivers/media/i2c/ov9655.c;hb=HEAD>
>         <http://git.goldelico.com/?p=gta04-kernel.git;a=blob;f=include/media/ov9655.h;hb=HEAD>
>
> and of course the matching board file entries (to load and configure camera and ISP capture interface):
>
>         <http://git.goldelico.com/?p=gta04-kernel.git;a=blob;f=arch/arm/mach-omap2/board-omap3gta04.c;hb=HEAD>
>
> The working camera demo (only works as "camera-demo sxga") is here:
>
>         <http://git.goldelico.com/?p=gta04-rootfs.git;a=blob;f=debian/config/root/camera-demo;hb=HEAD>
>
> And frame capture by C code:
>
>         <http://git.goldelico.com/?p=gta04-rootfs.git;a=blob;f=debian/config/root/capture.c;hb=HEAD>
>
> Finally, the media-ctl comes as a precompiled (armel) debian package here:
>
>         <http://download.goldelico.com/gta04/debian/dists/stable/main/binary-armel/>
>
> So what is working?
> * initialization
> * capture interface
> * SXGA resolution (specified for 15fps)
> * capture through mplayer or C code
> * media-ctl to set-up the OMAP3 ISP
>
> What is not working?
> * hsync/vsync position
> * VGA, QVGA, CIF does not set pixel clock etc. correctly
> * only understands UYVY although the camera can provide (raw or cooked) RGB
> * frame rate (?)
> * more settings (black/white level, AGC)
> * flashlight driver and connection between drivers
> * picture is a little speckled (green and magenta spots)
> * the driver code still has spoils from the original driver it was forked from, i.e. needs code clean-up
> * overclocking of the camera - it is specified to run up to 48 MHz which would theoretically allow 30fps @ SXGA
>
> What were the key challenges?
> * understanding how V4L2 subdevices work
> * understanding that both the camera and the OMAP3 have a signal processor
> * understanding the media-ctl command to bypass the OMAP3 ISP
> * understanding format encoding in the kernel drivers
>
> Happy experimenting!
>
> Now as the basics are here, I am curious which distro will be the first to come with a camera application :)
>
> Nikolaus
>
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