Odroid C2, Android OS - How to change RTC date and time

[OdoroidAndroid26]

I have the PCF8563 RTC Shield on my odroid board, and I’m trying to change the date and time of the RTC.
I’ve tried using the Android terminal emulator, to do things such as “date -s” or just “date”, however it only changes the system time and date, not the RTC’s time and date.

Any idea how to do this?

[tobetter]

I have the PCF8563 RTC Shield on my odroid board, and I’m trying to change the date and time of the RTC.
I’ve tried using the Android terminal emulator, to do things such as “date -s” or just “date”, however it only changes the system time and date, not the RTC’s time and date.

Any idea how to do this?

Can you run this command in terminal and show me how it is?

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$ ls -l /dev/rtc*


[OdoroidAndroid26]

I have the PCF8563 RTC Shield on my odroid board, and I’m trying to change the date and time of the RTC.
I’ve tried using the Android terminal emulator, to do things such as “date -s” or just “date”, however it only changes the system time and date, not the RTC’s time and date.

Any idea how to do this?

Can you run this command in terminal and show me how it is?

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$ ls -l /dev/rtc*


Of course, this is what was displayed:

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crw-r----- system    system    252,    0 2018-06-21 10:58 rtc0


[rooted]

Use:

sudo hwclock -w

[OdoroidAndroid26]

Use:

sudo hwclock -w

I presume you mean trying

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 su

and then

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 hwclock -w

Since I'm using the android terminal emulator,
however it get the following back:

hwclock: failed: No such file or directory

[rooted]

Oh I somehow missed you were on Android, I'm not sure how it works here. Sorry about that.

[tobetter]

If only /dev/rtc0 is there, it should work. Is your Android version is the latest one? Even the time is not set from Settings?

[OdoroidAndroid26]

If only /dev/rtc0 is there, it should work. Is your Android version is the latest one? Even the time is not set from Settings?

/dev/rtc0 Is the only one there. And I have Android Marshmallow (v4.2) installed to the odroid c2 device.

Using the

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date

along with a string representing the date and time command, does change the system time.

i.e

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date 1111111111.11

outputs Fri Nov 11 11:11:11 GMT 2011,
and the command

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date

will return the newly set date.

However

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hwclock

will still return whatever the date and time previously was on the rtc. So when the device is powered off and back on, the system reverts to this date again.

The same applies if I change the time/date through settings.

[tobetter]

Can you try if you can see these?

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root@odroidc2:/ # ls /sys/class/rtc/rtc0/ -l                                   
-r--r--r-- root     root         4096 2018-08-24 13:38 date
-r--r--r-- root     root         4096 2018-08-24 13:38 dev
lrwxrwxrwx root     root              2018-08-24 13:38 device -> ../../../1-0051
-r--r--r-- root     root         4096 2018-06-26 13:35 hctosys
-rw-r--r-- root     root         4096 2018-08-24 13:38 max_user_freq
-r--r--r-- root     root         4096 2018-08-24 13:38 name
drwxr-xr-x root     root              2018-06-26 13:35 power
-r--r--r-- root     root         4096 2018-08-24 13:38 since_epoch
lrwxrwxrwx root     root              2018-08-24 13:38 subsystem -> ../../../../../class/rtc
-r--r--r-- root     root         4096 2018-08-24 13:38 time
-rw-r--r-- root     root         4096 2018-06-26 13:35 uevent


Also, try to run # cat /sys/class/rtc/rtc0/date. If it shows errors like these, I2C is not working with RTC module or RTC module itself could have a problem.

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[   83.062566@0] i2c i2c-1: [aml_i2c_xfer] error ret = -5 (-EIO)
[   83.062674@0] i2c i2c-1: token 1, master_no(1) 300K addr 0x51
[   83.068465@0] i2c i2c-1: [aml_i2c_xfer] error ret = -5 (-EIO)
[   83.074121@0] i2c i2c-1: token 1, master_no(1) 300K addr 0x51
[   83.079840@0] i2c i2c-1: [aml_i2c_xfer] error ret = -5 (-EIO)
[   83.085482@0] i2c i2c-1: token 1, master_no(1) 300K addr 0x51
[   83.091151@0] rtc-pcf8563 1-0051: pcf8563_get_datetime: read erro


Maybe you could post a picture how you connected the RTC module.

[OdoroidAndroid26]

Can you try if you can see these?

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root@odroidc2:/ # ls /sys/class/rtc/rtc0/ -l                                   
-r--r--r-- root     root         4096 2018-08-24 13:38 date
-r--r--r-- root     root         4096 2018-08-24 13:38 dev
lrwxrwxrwx root     root              2018-08-24 13:38 device -> ../../../1-0051
-r--r--r-- root     root         4096 2018-06-26 13:35 hctosys
-rw-r--r-- root     root         4096 2018-08-24 13:38 max_user_freq
-r--r--r-- root     root         4096 2018-08-24 13:38 name
drwxr-xr-x root     root              2018-06-26 13:35 power
-r--r--r-- root     root         4096 2018-08-24 13:38 since_epoch
lrwxrwxrwx root     root              2018-08-24 13:38 subsystem -> ../../../../../class/rtc
-r--r--r-- root     root         4096 2018-08-24 13:38 time
-rw-r--r-- root     root         4096 2018-06-26 13:35 uevent


Also, try to run # cat /sys/class/rtc/rtc0/date. If it shows errors like these, I2C is not working with RTC module or RTC module itself could have a problem.

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[   83.062566@0] i2c i2c-1: [aml_i2c_xfer] error ret = -5 (-EIO)
[   83.062674@0] i2c i2c-1: token 1, master_no(1) 300K addr 0x51
[   83.068465@0] i2c i2c-1: [aml_i2c_xfer] error ret = -5 (-EIO)
[   83.074121@0] i2c i2c-1: token 1, master_no(1) 300K addr 0x51
[   83.079840@0] i2c i2c-1: [aml_i2c_xfer] error ret = -5 (-EIO)
[   83.085482@0] i2c i2c-1: token 1, master_no(1) 300K addr 0x51
[   83.091151@0] rtc-pcf8563 1-0051: pcf8563_get_datetime: read erro


Maybe you could post a picture how you connected the RTC module.

The rtc module is connected the same way as in the image linked below:
https://www.hardkernel.com/main/_Files/ ... 375783.jpg

I got the same output as you when running the command

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ls /sys/class/rtc/rtc0/ -l

And running

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cat /sys/class/rtc/rtc0/date

returned no errors, it simply returned the rtcs set date.

[tobetter]

If that's the case, ODROID-C2 can talk with RTC shield, but RTC is not ticking??
Did you see time changes whenever you run hwclock?
Can you run the command hwclock -f /dev/rtc0 if it is still same?
Could you try to run Ubuntu for ODROID-C2 and do the same using hwclock in order to check RTC Shield is ok or not?