• State
  • Locked Locked
  • Replies 8 replies
  • Subscribers 97 subscribers
  • Views 882 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

10'' LCD Parameters on DM385(TI81xx)

Ramesh071
Intellectual 620 points
Other Parts Discussed in Thread: DM385, DS90C385A

Dear all,

I'm using the DM385 evm with  ti-ezsdk_dm814x-evm_5_05_02_00 SDK.

In our EVK, we are planning to use 5'' and 10'' LCD. 5'' LCD is working with default configuration. But 10'' is not working.

I have changed lcd configuration as follows, but no o/p.

Trial 1

====

configure_lcd()
{
    echo "Configuring fb0 to LCD"
    echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes
    echo 0 > /sys/devices/platform/vpss/display1/enabled
    echo 83460,1280/64/200/136, 800/1/24/3/,1 > /sys/devices/platform/vpss/display0/timings
    echo triplediscrete,rgb888 > /sys/devices/platform/vpss/display1/output
    echo 1 > /sys/devices/platform/vpss/display1/enabled
    fbset -xres 1280 -yres 800 -vxres 1280 -vyres 800
}

Trial 2

======

configure_lcd()
{
    echo "Configuring fb0 to LCD"
    echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes
    echo 0 > /sys/devices/platform/vpss/display1/enabled
    echo 72500,1280/48/80/32, 800/3/14/6,1 > /sys/devices/platform/vpss/display0/timings
    echo triplediscrete,rgb888 > /sys/devices/platform/vpss/display1/output
    echo 1 > /sys/devices/platform/vpss/display1/enabled
    fbset -xres 1280 -yres 800 -vxres 1280 -vyres 800
}

Help to resolve this issue...!

Thanks & Regards

Ramappa

  • 0
    TI__Guru* 80190 points

    Hello,

    What you are observing when you set this resolution?

    Are you seeing any errors?

    Ramesh071 said:
    But 10'' is not working.

    Is this LCD supports 1280x800 resolution?

    Could you verify, that this LCD is working when doesn't connected to the board.

    Best Regards,

    Margarita

  • 0 in reply to Margarita Gashova
    Intellectual 620 points

    Hello Margarita,

    Thanks for your reply..!

    Yes, Our LCD is supporting the 1280X800 resolution. For your information we are using the following LCD Panel.

    TFT1280800-7-E.

    And I have checked the LCD and it's back light. It is working properly.

    I need the specific Timing parameters for this resolution. whatever parameters i have used, it is from NET.

     

    Thanks & Regards

    Ramappa

  • 0 in reply to Ramesh071
    TI__Guru* 80190 points

    Hello,

    Ramesh071 said:
    I need the specific Timing parameters for this resolution. whatever parameters i have used, it is from NET.

    You could try with:

    echo 83500,1280/72/200/128,800/3/22/6,1 > /sys/devices/platform/vpss/display1/timings

    or

    echo 79500,1280/48/80/32,800/3/14/6,1 > /sys/devices/platform/vpss/display1/timings

    Best Regards,

    Margarita

  • 0 in reply to Margarita Gashova
    Intellectual 620 points

    Hello,

    Thanks for your reply..!

    We will test these Parameters.

    Thanks & Regards

    Ramappa

  • 0 in reply to Ramesh071
    TI__Guru**** 477195 points

    Hi Ramesh,

     

    timing information is dependent on the LCD. If timing information provided by Margarita does not work, you will really need to look into LCD specs and get the information.

     

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Intellectual 620 points

    Hello Brijesh,

    I'm using the lvds connector between processor and the LCD Panel. It is similar to the following case.

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/245213/859569.aspx

    I'm using DS90C385A lvds transmitter and TFT1280800-7-V1-E LCD Panel. I have gone through these data sheets

    For 1280x800 i got pixel clock as 71MHz. But LVDS transmitter needs the clock  as 87.5 MHz.

    Which one i need to use, and why...?  Please give some clarity on this.

    Thanks in advance..!

    Thanks & Regards

    Ramappa



  • 0 in reply to Ramesh071
    TI__Guru* 80190 points

    Hello,

    Here is example for timing configuration:

    echo 148500,1920/88/148/44,1080/4/36/5,1 > /sys/devices/platform/vpss/display0/timings

    where:
148500: display pixel clock(KHz) 
    1920: display width
    88: horizontal front porch 
    148: horizontal back porch 
    44: horizontal sync width 
    1080: display height 
    4: vertical front porch 
    36: vertical back porch 
    5: vertical sync width 
    1: progressive output

    Best Regards,
    Margarita
  • 0
    TI__Guru* 80190 points

    Hello,

    Ramesh071 said:
        echo "Configuring fb0 to LCD"
        echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes
        echo 0 > /sys/devices/platform/vpss/display1/enabled
        echo 83460,1280/64/200/136, 800/1/24/3/,1 > /sys/devices/platform/vpss/display0/timings
        echo triplediscrete,rgb888 > /sys/devices/platform/vpss/display1/output
        echo 1 > /sys/devices/platform/vpss/display1/enabled
        fbset -xres 1280 -yres 800 -vxres 1280 -vyres 800

    Refer to:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/261971.aspx

    Best Regards,

    Margarita