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How to PCF8563 RTC Module on the Odroid C2

Preparations

  • ODROID-C2
  • uSD-Card ⇒ over 8GB or eMMC Module
  • PCF8563 RTC Module
  • Linux Kernel 3.14.65-66 or higher.how-to-update-kernel

Configuration

Ubuntu

  1. With your ODROID-C2 insert a PCF8563 RTC Module as the following picture.
  2. Enable RTC Shield
    odroid@odroid:~$ sudo apt install device-tree-compiler
    odroid@odroid:~$ sudo fdtput -t s /media/boot/meson64_odroidc2.dtb /i2c@c1108500/pcf8563@51 status "okay"
    odroid@odroid:~$ 
  3. Now you have the RTC on ODROID-C2 running with the current date and time the next step is to make it load when the ODROID-C2 boots.
    Edit the modules file:
    odroid@odroid:~$ echo "aml_i2c"|sudo tee -a /etc/modules 
    odroid@odroid:~$ cat /etc/modules 
    aml_i2c 
    odroid@odroid:~$

    Add aml_i2c at the end of the file.

  4. Next you want to add the RTC on ODROID-C2 at boot by editing /etc/rc.local.
    odroid@odroid:~$ sudo nano /etc/rc.local
    
    if [ -f /aafirstboot ]; then /aafirstboot start ; fi
    
    hwclock -s
    
    exit 0
    
    ^G Get Help  ^O Write Out ^W Where Is  ^K Cut Text  ^J Justify   ^C Cur Pos
    ^X Exit      ^R Read File ^\ Replace   ^U Uncut Text^T To Linter ^_ Go To Line 
    odroid@odroid:~$

    Add the following at the bottom of the page above exit 0. ^x exit and save the file. Reboot your ODROID-C2.

    odroid@odroid:~$ sudo reboot

    If everything worked correctly the RTC on ODROID-C2 should be initialised on boot and the current date and time will be loaded into Linux. You need to check the existence of “rtc-pcf8563” in the output of “lsmod” command when the HW RTC doesn't work correctly.

  5. You can check the current time on the RTC on ODROID-C2 with:
    odroid@odroid:~$ sudo hwclock -r

    If this is the first time you have run the RTC on ODROID-C2 it will display a date of APR 20th 2016.

  6. If the ODROID-C2 is connected to the internet the correct date and time should be set automatically otherwise you can set the current date and time using:
    odroid@odroid:~$ sudo date -s "20 APR 2016 18:00:00" 

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

  7. To save the date into the RTC chip on ODROID-C2 use the following command:
    odroid@odroid:~$ sudo hwclock -w 

    Verify the date has been saved onto the RTC on ODROID-C2 with:

    odroid@odroid:~$ sudo hwclock -r

Android

This guide works on Android 5.1 V2.8 and V2.9 images only.

Open File Manager app.

Edit /storage/internal/boot.ini like this. (near end of file).

Before edit.

movi read dtb 0 ${dtbaddr}
# load kernel from vat or boot partition.
movi read boot 0 ${loadaddr}
#fatload mmc 0:1 ${loadaddr} Image
booti ${loadaddr} - ${dtbaddr}

After edit.

movi read dtb 0 ${dtbaddr}
# load kernel from vat or boot partition.
#movi read boot 0 ${loadaddr}
fatload mmc 0:1 ${loadaddr} Image
booti ${loadaddr} - ${dtbaddr}

Load kernel image from vfat partition built rtc module.

If you could not find 'fatload' command, remove /storage/internal/boot.ini file and reboot system.

Don't use NTP service

Update
If your network firewall is blocking the ntp service or no internet connection, you must stop the ntp service. Once the NTP failed, the RTC value could be reset !!!


Credit:
This instruction was made by phaseshifter (our forum member).
Original Post

To stop ntpd:

 sudo /etc/init.d/ntp stop 

or

 sudo service ntp stop 

To prevent it from starting at boot:

 sudo update-rc.d -f ntp remove 
en/pcf8563rtc.1484540256.txt.gz · Last modified: 2017/01/16 12:47 by odroid
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