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Old 01-17-2017, 05:01 AM   #1
Snaidy1
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Registered: Sep 2012
Posts: 8

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GPIO Btn read from Linux userspacce application


Hi Guyz,
I want to read the gpio status from my Linux application (user space) where an push button is connected.I want to know what are the method (Interrupt/ polling/ file read) I can make use to do it.

how I can get the interrupter from Linux GPIO driver to userspace ? is there a way ?

which is the best method to recognize & handle GPIO btn press in linux

Thanks,
Snaidy
 
Old 01-25-2017, 03:58 AM   #2
eSelix
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Registered: Oct 2009
Location: Wroclaw, Poland
Distribution: Arch, Kubuntu
Posts: 1,261

Rep: Reputation: 315Reputation: 315Reputation: 315Reputation: 315
In user space you can use sysfs interface, for example in shell:
Code:
# for using gpio no. 5
echo 5 > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio5/direction
cat /sys/class/gpio/gpio5/value
# and when you end
echo 5 > /sys/class/gpio/unexport
Most embedded devices uses device tree to describe its hardware, then you can use kernel modules for handling buttons: gpio-keys-polled or gpio-keys. More info at GPIO kernel documentation
 
  


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