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Software Application Development Microzed LED using Linux
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Microzed LED using Linux

Former Member
Former Member over 8 years ago

Hi guys,

 

Im using Microzed, ubuntu 16.04 and buildroot.

Im just trying to turn on and off the LED using this command :

  echo 906 > /sys/class/gpio/export           //I tried echo 47 but I had an Invalid GPIO 47

  echo out > /sys/class/gpio/gpio906/direction

  echo 1   > /sys/class/gpio/gpio906/value

 

but nothing happens!

 

Any help? Thx

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  • zedhed
    0 zedhed over 8 years ago

    Hi fourat,

    Getting the GPIO numbering is a bit tricky since the numbering scheme keeps changing on us as Linux evolves.

    Do you have Debug FS option turned on in your Ubuntu kernel?  If so, you may be able to see which GPIO controllers are available by evaluating /sys/kernel/debug/gpio as seen in this tutorial here:

    http://falsinsoft.blogspot.com/2012/11/access-gpio-from-linux-user-space.html

    This has helped me track down GPIO issues in the past so perhaps it will also work for you.

    Regards,

    -Kevin

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  • Former Member
    0 Former Member over 8 years ago in reply to zedhed

    Hi zedhed,

    thank you for your prompt reply.

    I tried to do as you said but when I access /sys/kernel/ I dont see debug the only things there are the following:

    fscaps   notes                           uevent_helper

    mm       rcu_expidited             uevent_segnum

     

    any help?

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  • Former Member
    0 Former Member over 8 years ago

    Hi,

    I think I have solved.

    You have to export gpio953 to turn the led on and off.

    Good luck

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