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Problem GPIO PH5





I get an error when i try to use the PH5 pin as digital output.


PH5 is the number 229 according to the following equation:  (8-1)*32+5 = 229


echo 229 > /sys/class/gpio/export

-bash: echo: write error: Device or resource busy 


If i use other pins like PH13, PH19, PH20 or PH21, all work correctly. For example, for PH13 as digital output:

echo 237 > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio237/direction
echo "1" > /sys/class/gpio/gpio237/value
echo "0" > /sys/class/gpio/gpio237/value
echo 237 > /sys/class/gpio/unexport


I get the same error in the Cubieboard2 and the Lime A20 board.


Can someone help me ?

Thanks in advance





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