--- wikisrc/ports/evbarm/odroid-c1.mdwn	2015/04/03 20:23:55	1.14
+++ wikisrc/ports/evbarm/odroid-c1.mdwn	2015/04/25 14:50:13	1.15
@@ -20,13 +20,13 @@
    - RTL8211F PHY
  - Hardware random number generator
  - RTC
+ - GPIO
 
 # TODO
  - USB device mode
  - Simultaneous SD card and eMMC usage
  - SD/MMC UHS-I support (needs sdmmc(4) changes)
  - IR receiver
- - GPIO
  - I2C
  - Audio
 
@@ -147,6 +147,27 @@ Setting *scale* to 100 disables scaling,
 
 To set this value at boot, you can add **fb.scale=95** to the kernel cmdline options in *boot.ini*.
 
+# SYS_LED
+
+The blue SYS_LED on the board is wired to GPIOAO_13. To control the LED from userland, set **gpio=YES** in rc.conf and add this to */etc/gpio.conf*:
+
+[[!template  id=programlisting text="""
+gpio4 13 set out sys_led
+"""]]
+
+After rebooting, the LED state can be controlled with [[!template id=man name="gpioctl" section="8"]].
+
+[[!template  id=programlisting text="""
+# turn the light on
+gpioctl gpio4 sys_led on
+
+# turn the light off
+gpioctl gpio4 sys_led off
+
+# toggle the light state
+gpioctl gpio4 sys_led toggle
+"""]]
+
 # Documentation
 
 Amlogic S805 datasheet: <http://dn.odroid.com/S805/Datasheet/S805_Datasheet%20V0.8%2020150126.pdf>