Sysfs Interface. I Can't Export Gpio Pins in a Xilinx's Board (Zybo and Other)

SysFs interface. I can't export gpio pins in a Xilinx's Board (Zybo and other)

I faced the same problem. The solution is to add 906 as a "base" of the "address-gpio". For example, if you want to manage the pin of the PS connected to MIO 7, you should do something like this:

zynq> echo 913 > /sys/class/gpio/export
zynq> echo out > /sys/class/gpio/gpio913/direction
zynq> echo 1 > /sys/class/gpio/gpio913/value

(where 906+7=913 of course).

Or, if you want to switch it off:

 zynq> echo 0 > /sys/class/gpio/gpio913/value

How do I find this value? Well, in my case I was just lucky: if you have a look in

ls /sys/class/gpio

you can see that it already exists gpiochip906. Go inside this directory and have a look inside the file base (using "less" for example): there is only the value 906 of course

How to set a gpio pin to high and make it visible in /sys/class/gpio?

Well I did this with the example given here

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