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Problem in blinking LED on OMAPL137 EVM board

lokesh kumar65677
Intellectual 550 points

Other Parts Discussed in Thread: DA8XX

Hi all,

I am using the OMAPL137 EVM board  and i am trying to glow the leds DS1 to DS4, which are connected to GPIO's.

I wrote the program in which i am taking care for configuring the PINMUX to GPIO's, and i am setting the direction and then making the GPIO pin high and low.

But the LED doesn't  glow at all, i was suspecting a problem with the PINMUX...

So, when i tried the DEVMEM command to change the value of PINMUX and GPIO, i was unable to see the changes i made to PINMUX.....

I am using kernel version 2.6.32-rc6...

 

If some one can help me out, like is the problem and how to correct it......

 

Thanks,

Lokesh

 

 

  • 0
    Prodigy 190 points

    How are you setting the PINMUX?  And are you using sysfs or a kernel module to access the GPIO interface?

  • 0 in reply to nickb
    Intellectual 550 points

     

    I am using the external kernel module and also i tried using the devmem command for the PINMUX enabling....

    am i doing correctly or is their any mistake......

    Please assist me....

    Thanks,

    Lokesh

     

  • 0 in reply to lokesh kumar65677
    Prodigy 190 points

    I can't comment on whether /dev/mem should work for pinmuxing because I haven't tried it yet.  When I set my pinmux I just modified the kernel directly.  Just add another function call to da8xx_pinmux_setup in the function da830_env_init which is in arch/arm/mach-davinci/board-da830-evm.c.  I passed the function an array of the gpio pins that I created in da830.c.  If you go that route, you'll have to make a forward declaration of the array in da8xx.h

    After rebuilding with that method, I was able to control the LEDs using the /dev/user_gpio from the module as well as through sysfs. 

  • 0 in reply to nickb
    Intellectual 550 points

    Hi,

    Ya... that will work and worked for me too.... but as i will be using pins for different uses i need PINMUX to be working when i insert the external module...

    The primary purpose of blinking the LED is that am i able to make changes by using the external module.....

    Please if you can tell me how that will be working for me....

     

    Thanks,

    Lokesh