====== GPIO on Radxa ======
 
  * [[http://radxa.com/Rock/extension_header|Headers schema]]
  * [[http://android.serverbox.ch/?p=972|Android APP that read GPIO]]

Power on blue led
<code bash>
echo default-on > /sys/class/leds/blue/trigger
</code>

Power off
<code bash>
echo none > /sys/class/leds/blue/trigger
</code>

Header J8
|1|2|
|3|4| 
|5|6|
|7 OUT|8|
|9 IN|10|
|11|12|

^name^n^pin^header^
|0_A7|167|7|J8|
|0_B1|169|9|J8|
|PWM2|285|11|J8|

Input on pin 169 (GPIO0_B1) (pin n°9 su J8)
<code bash>
# input on pin 9
echo 169 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio169/direction
echo rising > /sys/class/gpio/gpio169/edge
cat /sys/class/gpio/gpio169/value

# output on pin 7
echo 167 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio167/direction

# on
echo 1 > /sys/class/gpio/gpio167/value

# off
echo 0 > /sys/class/gpio/gpio167/value
</code>