Problem GPIO PH5

[OpenglMan]

Hello,

 

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

 

 

 

 

[martinayotte]

Probably on most boards, PH5 is USB0-VBUSDET, at least on Olimex ones.

 

 

[OpenglMan]

Thanks martinayotte for your answer. Yes, It seems this pin is being used. I will use another pin.

 

Thanks anyway