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How to enable touchscreen in beagleboard xm under android by using controller tsc2007?

embedded zhang
Prodigy 30 points
Other Parts Discussed in Thread: TSC2007, ADS7846, AM1808

Hi,

I am currently using a 7 inch touchscreen with tsc2007 controller under android jb environment for bb xm.

I did some research and find some instructions for ads7846 controller, e.g.,  http://processors.wiki.ti.com/index.php/TI-Android-GingerBread-2.3.4-DevKit-2.1_PortingGuides#Touchscreen, and http://e2e.ti.com/support/embedded/android/f/509/t/128893.aspx. Unfortunately, I have not found any info. regarding tsc2007 controller, or how to modify the file 'board-omap3evm.c'.

Can anybody be helpful for this?

  • 0
    TI__Expert 7220 points

    Hello,

    We have not tried tsc2007 touchscreen integration. However I found a useful guide for tsc2007 driver integration to a similar board based on AM1808 http://calixtosystems.googlecode.com/files/Note%20on%20Enabling%20Touch%20Screen%20on%20AM1808%20SOM%20and%20EVM%20using%20TSC2007.pdf

    Regards,

    Arun

  • 0 in reply to Arun Joseph
    Prodigy 30 points

    Hi, Arun,

    Thanks for your reply. First please forgive me if I ask stupid questions since I am a newbie. I looked through the document you suggested and figured out that the doc contains the following steps:

    1. gedit ~/rowboat-android/kernel/arch/arm/mach-davinci/include/mach/mux.h

    add DA850_GPIO8_12 for lcd PIN MUX

    2. geany ~/rowboat-android/kernel/arch/arm/mach-davinci/da850.c

    add the PIN-MUX configuration of GPIO8_12

    3. Modify board-da850-evm.c

    Unfortunately, I find the following problems:

    1. there is no lcd pin mux in mux.h under mach-omap2 folder

    2. there is no file similar to da850.c under mach-omap2 folder

    3. the only similar file I can find is the evm file, which is the board-da850-evm.c file. But I am not sure whether it is enough to modify only this file?

    In addition, after the modification of the kernel, I need only update the uImage file without re-build the android rootfs, is there right?

    Your prompt assistance is greatly appreciated.

  • 0 in reply to embedded zhang
    TI__Expert 7220 points

    Hello,

    You can find the corresponding files for mach-omap2

    mux34xx.h and board-omap3beagle.c

    You just need to modify kernel uImage for integrating this touchscreen.

    Regards,

    Arun

  • 0 in reply to Arun Joseph
    Prodigy 30 points

    Hi, Arun,

    Unfortunately I find a lot of difference between the files you provided and the files in the pdf file.

    I bet it could be difficult for me to successfully enable the tsc2007 touch function from davinci to omap3. 

    I happened to find the following patch for a tsc2007 based touchscreen under android ics for bb xm：

    http://code.google.com/p/rowboat/issues/attachmentText?id=135&aid=1350001000&name=ulcd-esc-boston-2011-110925.patch&token=MHQbk2FiQtN1O0K-5ygHun8Uct0%3A1380840269606

    Here is the plan I want to have a try. Can you please give me some suggestion for me to avoid stupid mistake?

    I want to change the  

    /kernel/arch/arm/mach-omap2/board-omap3beagle.c file following the patch which is provided between line 971 and line  1230 in the above patch, since it is the only file in the directory kernel/arch/arm.

    Can you please be helpful to 

    1. take a look at line 971 and line  1230 in the patch

    http://code.google.com/p/rowboat/issues/attachmentText?id=135&aid=1350001000&name=ulcd-esc-boston-2011-110925.patch&token=MHQbk2FiQtN1O0K-5ygHun8Uct0%3A1380840269606

    to see whether there is something I need to take extra care for?

    2. search '+++' and highlight all in the patch to see whether there is other file I need to change as well?

    3. whether my plan is feasible for a newbie?

    Thank you so much.

  • 0 in reply to embedded zhang
    TI__Expert 7220 points

    Hello,

    Go ahead with your plan. Take only tsc2007 specific for now.

    Regards,

    Arun