DM814x-EVM and a new (different) LCD

Hi,

Answers inline,

Nicholas said:

How can I change the LCD characteristics to support a different LCD (the one that we are going to use)? A manual I saw here has some directions, but they do not work on this system. For example, when I enter 'echo 0 >   /sys/devices/platform/vpss/display1/enabled' it gives an error "failed to disable dvo2 venc".

You are on correct path. You need to stop all the FBDEV applications before you can change mode. I think QT is running on your system.

Nicholas said:

Edit: Would stopping (or 'killing') the demo program allow me to disable the dvo2 venc?

Yes, You should stop demo program.

Nicholas said:

Do we need to use vpss? For our application we do not need any 'video', just some simple graphics, framebuffers, and such;

Yes, VPSS is must for any display/capture application. even FBDEV.

Nicholas said:

How can we remove this demo program from executing? is it somewhere in the menuconfig?  (Edit) Or somewhere in the init.d folder?

I think you can stop it. Can you please refer to EZSDK user guide to see how to stop it. I am not the correct person to comment on EZSDK.

Regards,

Hardik Shah

Thanks for your reply. Things are a bit clearer now, but still I cannot see anything on this new LCD we have. When I load the image on this board, there is this script file in the /etc/init.d folder:  load-hd-firmware.sh. If this is not executed, then the /dev/fb0 is not created.

Now, in this script file, there are these commands:

-------------------------------------------------------------------------------------------------

PATH=$PATH:/usr/share/ti/ti-media-controller-utils
HDVICP2_ID=1
HDVPSS_ID=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 33500,800/164/89/10,480/10/23/10,1 > /sys/devices/platform/vpss/display1/timings
    echo triplediscrete,rgb888 > /sys/devices/platform/vpss/display1/output
    echo 1 > /sys/devices/platform/vpss/display1/enabled
    fbset -xres 800 -yres 480 -vxres 800 -vyres 480
}

case "$1" in
    start)
        echo "Loading HDVICP2 Firmware"
        prcm_config_app s
        modprobe syslink
        until [[ -e /dev/syslinkipc_ProcMgr && -e /dev/syslinkipc_ClientNotifyMgr ]]
        do
            sleep 0.5
        done
        firmware_loader $HDVICP2_ID /usr/share/ti/ti-media-controller-utils/dm814x_hdvicp.xem3 start
        echo "Loading HDVPSS Firmware"
        firmware_loader $HDVPSS_ID /usr/share/ti/ti-media-controller-utils/dm814x_hdvpss.xem3 start
        modprobe vpss sbufaddr=0xBFB00000 mode=hdmi:720p-60 debug=1
        modprobe ti81xxfb vram=0:24M,1:16M,2:6M
        configure_lcd
        modprobe ti81xxhdmi
        modprobe tlc59108
      ;;
    stop) 
        <stopping script>
        ....................

    .................................................................................................................

I know I have to change the numbers above in /sys/devices/platform/vpss/display1/timings. I put <25175,640/144/30/10,480/35/3/10,1> but it did not help (I also changed the fbset resolution to 640,480). One more point is the setting above 'rgb888'. The LCD we use (OSD057T0679-29TS) uses 6 pixels per colour (18 bits data signal). I tried something with the .../video1/trans_key_xxx, but to no avail. If somebody can help with the timing values above, here is a picture with this LCD's timings.  Thanks