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Accessing gpio pins using c program in omapl138

Mohamed EL BAB
Prodigy 60 points
Other Parts Discussed in Thread: OMAPL138

hi,

I would like to know is exist a method that we can access gpio pins by my board omapL138 using linux. and how can i configuring the GPIO module in this platform.

thanks in Adv

Mohamed

  • Expert 1665 points

    You can find all needed information of how to export GPIO to user space here : <kernel_dir>/Documentation/gpio.txt

    You can't control behavior of this PIN. Pls, see TRM Table 18-713. CONTROL_WKUP_PAD0_SYS_NRESPWRON_PAD1_SYS_NRESWARM

  • in reply to Grygorii Strashko50
    Expert 1665 points

    Sorry, drop second section re -send

    You can find all needed information of how to export GPIO to user space here : <kernel_dir>/Documentation/gpio.txt

  • in reply to Grygorii Strashko50
    Prodigy 60 points

    I want to compile the module for an example by this command :

    make -C <kernel directory> M=`pwd` ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-

    but I don't know exactly what the path of <kernel directory>, i was trying  /lib/modules/`uname -r`/build


    and i was trying :

    make -C /home/manyo/DaVinci-PSP-SDK-03.20.00.14/src/kernel/linux-03.20.00.14/ M=`pwd` ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-

    he gave me an error in my target, he was not working in board omapl138 , making insmod  mon_module.ko :

    insmod: error inserting 'mon_module.ko': -1 Invalid parameters

             
    root@arago:/Module-GPIO#           

    Thanks in adv                                                        

    Mohamed

  • in reply to Mohamed EL BAB
    Prodigy 60 points

    Hi,

    How can I to add a button / buttons to map OMAPL138 to apply them in a QT application or Program C, knowing that it is just a button called power in (S5 RST).

    And an other thing I still do not know the position of GPIOs with their Number on the map like DA850_GPIO6_12.

    Thks in Advs

    Mohamed