====== Basics of 30pin Port ======
The **ODROID-XU3** provides 30Pin GPIOs.

{{http://dn.odroid.com/homebackup/201310211158488480.jpg}}


** You need to enter into super-user mode first to run below commands !! **\\
<code> sudo su </code>
\\ \\ \\

**Easy to use GPIOs**\\
First, you refer to below link.\\
You check Export number that you want to use GPIO.\\
[[en:xu3_hardware&#expansion_connectors | Pin description]]

Create a GPIO file access.\\
You can access GPIOs using sysfs interface.
  echo 29 > /sys/class/gpio/export
Configure the pin direction (in/out)
  echo in > /sys/class/gpio/gpio29/direction
Read a value
  cat /sys/class/gpio/gpio29/value

{{http://dn.odroid.com/homebackup/201310211155385344.jpg}}\\
[[http://www.hardkernel.com/main/products/prdt_info.php?g_code=G138232136481|Expansion Board]]



** LED ON/OFF example **\\
If you want to use LED ON/OFF, first you check the NET name in Expansion Board.\\
For example, The NET name of D1 is INT23.\\
According to below link, The Export GPIO number is #31.\\
[[en:xu3_hardware&#expansion_connectors | Pin description]]

  echo 31 > /sys/class/gpio/export
  echo out > /sys/class/gpio/gpio31/direction
LED ON
  echo 1 > /sys/class/gpio/gpio31/value
LED OFF
  echo 0 > /sys/class/gpio/gpio31/value