Beagone Black Internall pull-up / pull-down on GPIO

[Denys Trofymenko]

Hi, I know (from BBB documentation) that we can configure internall pull-ups or pull-downs.

Is this implemented in the libbouldog library? if yes, how can i use it.

thanks

[Hannes]

Not your request answer, but:

For all who work with device trees:

http://kilobaser.com/blog/2014-07-28-beaglebone-black-devicetreeoverlay-generator#dtogenerator

Very helpful!

Not sure if libbulldog overwrite this settings ... or you can call this after.

[Datenheld]

Thanks Hannes.

This feature (pullup/pulldown) is currently not implemented but I might add it in a future release. Currently, it is questionable wether this project will be continued or be part of another project that is somewhat bigger. That's why development is currently on hold - until the other projects develops some pace or is abandoned. Let's see next year. Either way, it will be a win-win situation for users.

[Denys Trofymenko]

Thanks Datenheld and Hannes,

I am not an expert in Embedded Linux or device tree, and how the OS kernel is related with Hw, etc.

I found this post that explains how to use gpio on BBB via sysfs (shell command line) in linux.

http://stackoverflow.com/questions/12025119/beaglebone-gpio-input-not-working

the example is like this: 

echo 7 > /sys/kernel/debug/omap_mux/gpmc_ad6
echo 38 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio38/direction
cat /sys/class/gpio/gpio38/value

do you think i could use this in the linux boot to set up my gpio pull up / pull down input pin (only the first line where I set the pin mode, direction and pull up/down)? or I should better use the method proposed by Hannes and compile device tree?

thanks very much, I know that its not very related to the libbouldog but I really appreciate if you give me your opinion.

Denys