RTC on the Odroid W

This page details how to setup the RTC Odroid W on the Raspbian “wheezy” image from http://www.raspberrypi.org/downloads

• Odroid W
• uSD-Card ⇒ over 2GB or eMMC Module
• RTC Backup battery

1. Building the kernel
   Please refer to Kernel compilation for odroid-w
2. With your Odroid W insert a RTC Backup Battery into the battery connector which is BT1.
3. Enable I2C by running:

   sudo vi /etc/modprobe.d/raspi-blacklist.conf

   Find the I2C line where the i2c is black listed

   blacklist i2c-bcm2708

   Comment it out by replacing it with the line below

   #blacklist i2c-bcm2708

4. Now you have the RTC Odroid W running with the current date and time the next step is to make it load when the Odroid W boots.
   Edit the modules file:

    sudo vi /etc/modules 

   Add rtc-rc5t619 at the end of the file and save it.

5. Next you want to add the RTC Odroid W at boot by editing /etc/rc.local.
   sudo vi /etc/rc.local
   Add the following at the bottom of the page above exit 0.

    echo rc5t619 0x32 > /sys/class/i2c-adapter/i2c-0/new_device 
    hwclock -s 

   Save the file and reboot your Odroid W.

   sudo reboot

   If everything worked correctly the RTC Odroid W should be initialised on boot and the current date and time will be loaded into Linux.

6. You can check the current time on the RTC Odroid W with:

    sudo hwclock -r

   If this is the first time you have run the RTC Odroid W it will display a date of July 17th 2014.

7. If the Odroid W is connected to the internet the correct date and time should be set automatically otherwise you can set the current date and time using:

   sudo date -s "17 JUL 2014 18:00:00" 

   You can check the current linux date with the command (date).

8. To save the date onto the RTC Odroid W use the following command:

    sudo hwclock -w 

   Verify the date has been saved onto the RTC Odroid W with:

   sudo hwclock -r