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Last Post 03 Oct 2007 02:46 AM by  arjun.kv@7lf-tech.com
Interfacing LQ035Q7DB03
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arjun.kv@7lf-tech.com
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03 Sep 2007 07:22 AM
    Hi,

    I interfaced LQ035Q7DB03 to litekit. And I am not able to do any operation on the LCD in losh. The backlight seems to work fine. I can see some flicker on the screen when i do a video-open. Other tests like draw-test or video-clear dont seem to work at all. There are no failure messages on the shell.
    What voltage should be given to the VEE and VDD on the LCD, right now I am connecting LCD_VEEEN and LCD_VDDEN from the board.
    It will be great if someone can provide the connection schematic for the interfacing.

    Regards,
    Arjun
    motraat
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    03 Sep 2007 10:09 AM
    Is this LQ035Q7DB03 or LQ035Q7DB02 LCD ??
    arjun.kv@7lf-tech.com
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    03 Sep 2007 11:13 PM
    This is LQ035Q7DB03 LCD which is nothing but LQ035Q7DB02 without touchscreen capability. So basically LQ035Q7DB02 interfacing would match the one we are doing.
    motraat
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    04 Sep 2007 01:52 AM
    firt try to do

    #losh> video-open 8 16

    #losh> draw-test

    You should be able to see test image on screen. Then see another post where I have mailed settings for framebuffer driver in linux environment.

    cheers
    ajit
    arjun.kv@7lf-tech.com
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    04 Sep 2007 02:27 AM
    I tried this before:
    #losh> video-open 8 16

    #losh> draw-test

    But I dont see any response on the LCD after draw-test or video-clear commands. Also when i do a video-init or video-open I dont get a clear screen, it is somewhat distorted with lines of different colours. And the screen responds for no other command. Thats why I asked what voltage should be given to the VEE and VDD on the LCD. For which right now I am connecting LCD_VEEEN and LCD_VDDEN(both 3v) from the board.

    regards,
    arjun
    motraat
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    04 Sep 2007 05:32 AM
    "Also when i do a video-init or video-open I dont get a clear screen, it is somewhat distorted with lines of different colours." Looks ok to me. I too see same when I do video-open 8 16. But draw-test has effect in my case.

    Another thing, I got LCD from logic itself. It comes with a colorful connector "wire-band". I just had to put this in proper slot on my board and it worked.
    arjun.kv@7lf-tech.com
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    04 Sep 2007 07:02 AM
    I think the problem for us is the power supply unit for LCD, since we are interfacing on our own.
    motraat
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    05 Sep 2007 05:03 AM
    can u give ur personal id?
    arjun.kv@7lf-tech.com
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    05 Sep 2007 05:09 AM
    Feel free to contact me at arjun.kv@7lf-tech.com
    motraat
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    06 Sep 2007 03:00 AM
    did u check my mail?
    arjun.kv@7lf-tech.com
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    29 Sep 2007 05:47 AM
    Is LQ035Q7DB03 supported by LoLo? Because I am only able to video-open the lcd and then nothing works. All connections look to be alright and power supplies are proper.

    losh> config v
    dev_config->screen[0]: test x: 320 y: 240
    SDC_COM_CONF: 00000201
    SDC_GB_POS: 0020000b
    SDC_HOR_CONF: 35120000
    SDC_VER_CONF: 094c0001
    SDC_SHARP_CONF_1: 00000000
    SDC_SHARP_CONF_2: 00000000
    DI_DISP_IF_CONF: 00000000
    DI_DISP_SIG_POL: 04000000
    DI_DISP3_TIME_CONF: 02c00140
    Frame Buffer: deadbeef
    dev_config->screen[1]: available
    dev_config->screen[2]: available
    dev_config->screen[3]: available
    dev_config->screen[4]: available
    dev_config->screen[5]: available
    dev_config->screen[6]: available
    dev_config->screen[7]: available

    I get the above message.
    Any help would be really appreciated.
    richard.laborde@logicpd.com
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    01 Oct 2007 08:41 AM
    Arjun.KV,

    Both the LQ035Q7DB02-10 and -20 are supported in LoLo on the i.MX31.

    The -10 is display #6 and the -20 is display #8. The -20 has an ASIC as can be seen by typing "help video-open".

    Please verify which version you have w/o the touchscreen.

    Thanks

    Richard
    arjun.kv@7lf-tech.com
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    03 Oct 2007 02:46 AM
    I am able to run under the display #6. The problem i was facing was related to wiring.

    Thanks
    Arjun
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