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* Only for C-program example it also needed:
** Add shortcircuit cable between J990:20 and J990:22 pins. By default, GPIO 156 (J990:20) and GPIO 157 (J990:22) are available on these J990 pins.
Another boards tested:
*IGEP COM MODULE
*IGEP COM AQUILA
== 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]]
== Bash commandline ==
Basic gpio operations could be done using bash and sysfs :
* Export GPIOs <pre>echo "GPIO number NN" > /sys/class/gpio/export</pre>
** For example: '''echo "156" > /sys/class/gpio/export'''<br><br>
* Unexport GPIOs <pre>echo "GPIO number NN" > /sys/class/gpio/unexport</pre>
* Set GPIO direction <pre>echo "out" > /sys/class/gpio/gpioNN/direction</pre>
** For example: '''echo "out" > /sys/class/gpio/gpio156/direction'''<br><br>
* Set GPIO value <pre>echo "1" > /sys/class/gpio/gpioNN/value</pre>
* Get GPIO value <pre>cat /sys/class/gpio/gpioNN/value</pre>
At first remote terminal you should read a message similar like this:
<pre>poll() GPIO 157 interrupt occurred </pre>
