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A20 GPIO Interruption





I need to use an IRQ interruption with a button. I mean, I push a button, and then a code is executed.


Some information: The PIN is PH19, EINT19. and the board A20 SOM. Armbian SO, kernel 4.13


Firstly i configure the digital pin and IRQ from user space:

echo 243 > /sys/class/gpio/export

echo "in" > /sys/class/gpio/gpio243/direction

echo "falling" > /sys/class/gpio/gpio243/edge


Now, when I push the button, I can monitoring the IRQ and the counter related to

cat /proc/interrupts


But now, how can I run a program when the interruption event happens ? 


I have seen this useful link



How can i use it? I think there is very few information about this issue.


I executed a bash script with while true , and polling the digital pin, but the disadvantage is that it consumes a lot of cpu.


I hope you can help me. Thank you very much in advance







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Thank you martinayotte for your answer.


However i have found an alternative solution in PHP language that works pretty well. It barely consumes CPU. The code is very simple. Anyway I will try the code in c language that you indicated in your previous post. I imagine that the internal functioning will be similar in both solutions.


If anyone is interested, check the following link:





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