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Ycrcb 4:2:2 formats from C6748 Raster

Avi Tal
Expert 1120 points
Other Parts Discussed in Thread: OMAPL138

Dear friends,

 

I would like to output Ycrcb 4:2:2 format from c6748 Raster.

My questions are:

1. Is this possible? If yes, how? The examples always convert to RGB 565.

2. If the answer to 1 is yes, will I be able to view it on a standard display connected to the VGA connector?

3. Is it possible to output 8 bit (with double clock rate) to Raster and not only 16 bit?

4. Another question not directly related to the last 3: Is it possible to have a video loopback from in-to-out without using the DDR?

            I mean, for example, to take a single row of video from the VPIF and send it directly to the Raster without using the DDR to capture complete frames.

 

Your answers are much appreciated.

 

Thanks,

Avi Tal.

 

  • 0
    TI__Mastermind 35645 points

    Hi,

    Thanks for your post.

    Usually, the VPIF code in LCDK configures the port in Interlaced mode and the format in which the frame data is received is in form of Top YUV 422 field and Bottom YUV422 which is explained in the TRM below in section 36.2.3. The input can be configured to semi planar format which should make it easy for you to process the luma portion as only the chrominance values will be interleaved.

    http://www.ti.com/lit/ug/spruh92b/spruh92b.pdf

    Basically, LCDC controller, which when configured in Raster mode, can interface to a TFT LCD/Display and can be used to display static images with the help of a graphics library. Only one mode (either Raster mode/LIDD mode) would be active at a time in LCDC controller.

    Refer Section 2.5, Table 4 for the supported operating modes for raster controller & Section 3.8, Table 18 for LCD raster control register fields from the LCDC user guide below:

    http://www.ti.com/lit/ug/sprufm0b/sprufm0b.pdf

    Please refer the below source file for raster display configuration to interface TFT-LCD:

    ~\OMAPL138_StarterWare_1_10_03_03\examples\evmOMAPL138\raster\rasterDisplay.c

    Please refer the programming sequence for the raster controller as below:

    http://processors.wiki.ti.com/index.php/StarterWare_LCDC

    Thanks & regards,

    Sivaraj K

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