Re: Why is the Y12 support 12-bit grey formats at the CCDC input (Y12) is truncated to Y10 at the CCDC output?

[Michael Jones <michael.jones@matrix-vision.de>]

Hi James,

On 12/15/2011 08:14 AM, James wrote:
> Hi all,
>
> I'm using an OMAP3530 board and a monochrome 12-bit grey sensor.
>
> Can anyone enlighten me why is the 12-bit grey formats at the CCDC
> input (Y12) is truncated to Y10 at the CCDC output?

There are 2 CCDC outputs: CCDC_PAD_SOURCE_OF and CCDC_PAD_SOURCE_VP. 
Only the VP (video port) truncates data to 10 bits, and it does that 
because the subdevs it feeds can only handle 10 bits max.

>
> I need to read the entire RAW 12-bit grey value from the CCDC to
> memory and the data does not pass through other OMAP3ISP sub-devices.
>
> I intend to use Laurent's yavta to capture the data to file to verify
> its operation for the moment.
>
> Can this 12-bit (Y12) raw capture be done?

Yes. If you are writing the 12-bit gray value directly into memory, you 
will use SOURCE_OF and can write the full 12-bits into memory.  You need 
to set up your media pipeline to do sensor->CCDC->OMAP3 ISP CCDC output.

>
> Thank you in adv.
>
> --
> Regards,
> James

-Michael

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