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DM365evm+THS8200 Daughtercard VGA 720P output

bolin chen
Intellectual 445 points
Other Parts Discussed in Thread: THS8200

Hello everyone,

     My platform is DM365evm+THS8200 Daughtercard, I used the DVSDK2.10. I want to let graphic display in  PC monitor via VGA port, so i modified "davinci_platform.c ->davinci_enc_set_720p()"

and ths8200_encoder.c.

Now i can get the DM365 internal colorbars as the follow:

and i also can get THS8200 internal colorbars as follow:

DM365 and THS8200 internal colorbars seems all right,

but when i want to display my UI (by QT4.5), there has a problem .the UI can't  filled the entire screen. Just like the follow:


I think my ths8200 driver will be right, if not i can't get the DM365 internal colorbars output correctly.

I don't know where did we go wrong. 

 Any help would be appreciated.

 

Berlin Chen

2011.11.07

  • 0
    Intellectual 445 points

    Hi ,

        I have got the VGA output now,there were something wrong with my framebuffer settings.

    and now i have another question, could i have graphic both from VGA and BNC output at the same time?  what should I do?

    BR

    Berlin Chen

    2011.11.09

  • 0 in reply to bolin chen
    TI__Mastermind 30150 points

    Berlin Chen said:
    now i have another question, could i have graphic both from VGA and BNC output at the same time?  what should I do?

     

    - I assume that your question is related to the EVM and daughter specifically. Then you need to check the schematics of both to see how are the video signals routed:
    http://support.spectrumdigital.com/boards/evmdm365/revf/


    - Regarding DM365 device itself the Digital output and the internal video DACs can both output the same video but since the video DACs do only support TV standard then you can not use it for PC graphics like VGA. So you can only use the digital interface for VGA.

    - Also make sure to look at the V4L2 and FBdev Linux drivers document that are located in the DVSDK_2_xxx/PSP_2xx.xx/documentation folder.

    Hope it helps.

    Anthony

  • 0 in reply to AnBer
    Intellectual 445 points

    Hi AnBer,

        Thank you for your replies. Our video signals route as the follow:

    We want our video signals output via both BNC and VGA at the same time. As you say DACs do only support TV standard, so i want output PAL mode from DACs.And what should i do for my VGA output?  Should i set ths8200 as 720p settings ?or i need to set ths8200 with new settings .

    My English is too poor, hope to see what I mean

    BR
    Berlin Chen
    2011.11.10

  • 0 in reply to bolin chen
    Intellectual 445 points

    Hi,

            I have modified davinci_platform.c ,in davinci_enc_set_pal() i add the bt656 digital video output, and at the ths8200 CLKIN pin can get 27MHZ clock,and the Hsnyc is 15KHZ, the Vsync is 50HZ, i  also can get 8bits signals on GY2-GY9 pins. If i want graphics output via VGA what should i do for the THS8200 settings? 

    BR

    Berlin Chen

    2011.11.12