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omap-L138 LCD driver

li yaohua
Prodigy 50 points

Other Parts Discussed in Thread: OMAP-L138, DA8XX

when I  connect  omap-l138 with UI board ,I build the kernel and config the driver  like this URL

http://processors.wiki.ti.com/index.php/CSG:_Building_software_components for omap-L1#Rebuilding_the_linux_kernel

when I set up the evm ,I  input " echo "hello" >dev/lcd " , the lcd of UI board has no response, while it is light.

is there  lcd driver in the kernel that supports the UI board LCD , why does it have no response?

 

 

  • 0
    TI__Expert 5170 points

    I assume you are following the instrcutions at http://processors.wiki.ti.com/index.php/GSG:_Building_Software_Components_for_OMAP-L1#Character_LCD to enable the character LCD. Also some times you need to adjust the pot just beside the Chatacter LCD (R104) to get characters on the LCD.

    Thanks, Sudhakar

  • 0 in reply to Sudhakar Rajashekhara
    Prodigy 50 points

    I rebuild the kernel and adjuest the pot ,and then input  echo "hello" > /dev/lcd  many times, when  I adjust one angle ，one line is white ,one line is black.

    when I set up the evm ,I can see

    Panel driver version 0.9.5 not yet registered                                                                                                    
    da8xx_lcdc da8xx_lcdc.0: attached parallel port driver    

     from the minicom

    I cannot find the .ko module which is used for lcd ,

    can you  give me some advice

  • 0 in reply to Sudhakar Rajashekhara
    Prodigy 50 points

    today I go to a URL :

    http://processors.wiki.ti.com/index.php/DaVinci_PSP_03.20.00.06_Release_Notes

    find a character LCD patch which is need to re-sumbission to LKML

    https://patchwork.kernel.org/patch/45047/

    I do as it says ,when I set up evm

    I find

    Panel driver version 0.9.5 registered on parport0 (io=0xfee13000).
    Error: Driver 'da8xx_lcdc' is already registered, aborting...

    do you think I  am in a right way ??

  • 0 in reply to Sudhakar Rajashekhara
    Prodigy 50 points

    http://processors.wiki.ti.com/index.php/DaVinci_GIT_Linux_Kernel#Video_Display

    I find character lcd

    Patch adding dummy parallel port driver to support this has been rejected in LKML. Need to rework based on review received. Basically means cleaning up the panel.c driver before adding new support.

    does it mean omp-L138 not  supporting characterLCD driver