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At first remote terminal you should read a message similar like this:
<pre>poll() GPIO 157 interrupt occurred </pre>
=== How to chek an GPIO ===
The gpio-int-test.c program shows one way of using the sysfs file /sys/class/gpio/gpioXX/value to block program execution using poll() until the input level on GPIOXX changes.
[[File:GPIO_TEST.tar]]
