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Please have a look at WiringX, which also supports the Hummingboard:

http://wiringx.org/

Manual

• The external GPIOs are available under the /sys/class/gpio folder in Linux.

• To control on the GPIO pins you need to calculate the GPIO number XX (*) and run the commands below:

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• IMX6 Software Development/Drivers

• IMX6 Som Documents

• wiringHB

• http://wiringx.org/