[Gta04-owner] GTA04(A5) Camera (OV9655)

tgrauss tgrauss at f-gp.eu
Fri Jan 20 14:10:06 CET 2017


Hi,

I am interested for a camera module for my future GTA04.

Regards

Thierry

On 20/01/2017 12:53, H. Nikolaus Schaller wrote:
> Hi,
> I took the time while we still have to wait for GTA04A5 production
> to continue to take another look into the camera driver.
> 
> This time I soldered 5 tiny wires to the camera connector and did
> check the signals.
> 
> I have seen:
> * XCLK: 40ns ~25 MHz
> * PCLK: 80ns 12.5 MHz
> * HS: negative going impulses (being constantly "L" while VS) with 
> 250µs
> * VS: positive impulses with 270ms
> * D8: one data line shows random bit patterns which change if I hold a
> finger on the lens
> 
> XCLK should be 24 MHz according to the device tree setup, so OMAP ISP
> setup is ok!
> 
> Since the OV9655 still runs in default initialization (because the
> ov9650 driver would write some wrong register values), PCLK is just 
> half
> of the required frequency.
> 
> Next, I get HS : PCLK = 1 : 3125, which is 1262.5 if we assume 2 bytes
> per pixel.
> 
> And VS : HS = 1 : 1080.
> 
> The camera has an image sensor array with 1300 x 1028 active area.
> Therefore, all this looks fine inside the precision of my measurements!
> 
> This also means that we are just missing correct setup of the camera 
> chip
> (clock and sync polarity and XCLK divider :1).
> 
> That needs just some trial and error steps... And a comparison with our 
> old
> ov9655 driver.
> 
> Since this runs on one of the 3 working GTA04A5 preproduction units, I
> think we can now order more camera modules without wasting money...
> 
> What I would need is some indication of demand.
> 
> BR,
> Nikolaus
> 
> _______________________________________________
> Gta04-owner mailing list
> Gta04-owner at goldelico.com
> http://lists.goldelico.com/mailman/listinfo.cgi/gta04-owner


More information about the Gta04-owner mailing list