Advantech ROM-5780, Руководство пользователя

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ROM-5780 User Manual 28
Export GPIO then you can use control GPIO from user space through sysfs.
Export GPIO0
Set GPIO direction to in/out
Set GPIO value 0/1 if GPIO pin define is output
Used as IRQ signal
Note: You have to configure GPIO to input
Unexport GPIO0
GPIO 0 and GPIO 1 are taken as an example:
Connect GPIO 0 and GPIO 1
Export GPIO 0 and GPIO 1
Set GPIO 1 to output
Set GPIO 2 to input
Change GPIO 0 to 1 and read GPIO 2 value
GPIO10 GPIO2_A3 67
GPIO11 GPIO4_C5 149