RTC IS NOT WORKING PROPERLY...

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RTC IS NOT WORKING PROPERLY...

Unread postby truerad » Tue Nov 28, 2017 7:50 pm

Hi....

We have purchased many of these products (more than 50) in the last 2 years for use on our products.
Our product is a Muslim prayer software for Muslims, where RTC is an important component to support the product.
And we chose to use C1 + because it has RTC feature.

However, for almost a year now, we have received many complaints from our buyers of our products, because the RTC is not working properly.
Every time the power supply is disconnected, then reconnected after a certain amount of time, the clock is always late for about 2-3 minutes. and this will accumulate into very much the time difference with real time.

Many of our products have been returned by buyers to us because they are disappointed. and we can not do anything except return their money.

And we are very disappointed and traumatized with C1 +

Is there a specific solution from hardkernel to the problem we are facing right now? we ask for help and wisdom.

Regards,
Ryan Andrian D
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Re: RTC IS NOT WORKING PROPERLY...

Unread postby odroid » Tue Nov 28, 2017 9:56 pm

Sorry to hear the bad situation.
As far as I know, the RTC block in S805 SoC CPU has two issues.
1. RTC time draft could be up to several minutes per month due to the bad reference clock time counter.
2. RTC power consumption is much higher than our estimation(3~5 years). The coin cell can run the RTC only 1~2 years.

This external RTC shield can be used with C1+ board. Its time draft should be less than 1 minute per month. It RTC battery life must be longer than 5 years or more.
http://www.hardkernel.com/main/products ... 6000366985
But it works with C2 board only at this moment. We need to port the RTC driver to C1+ kernel it may take a couple of weeks for the development.
Which OS do you use with C1+? Android? or Ubuntu/Linux?
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Re: RTC IS NOT WORKING PROPERLY...

Unread postby truerad » Tue Nov 28, 2017 10:52 pm

Hi...
Thanks to your quick response...
We use android (selfinstall-odroidc-eng-s805_4.4.4_master-452-v3.5) for the OS.
We really hope that soon there is a solution for RTC problems in Odroid C1+

Please accelerate the development process, and please inform us immediately if there is a solution.
Because we have a responsibility to immediately replace products that our customers have purchased with better one.

Regards,
RAD
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Re: RTC IS NOT WORKING PROPERLY...

Unread postby odroid » Wed Nov 29, 2017 12:03 pm

We will send you a trial firmware update within a couple of days.
Prepare some RTC Shield board for your test.
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Re: RTC IS NOT WORKING PROPERLY...

Unread postby odroid » Wed Nov 29, 2017 5:35 pm

We've uploaded a trial C1+ Android KitKat image for your test.
https://dn.odroid.com/S805/Android/test/kitkat/

We disabled the internal RTC and enabled the external RTC shield.
We installed it on our C1+ and attached the RTC-shield to the C1+ board.

We turned the C1+ on and made a sync with Internet time.
Unplug the network cable and turn it off.
After one hour, we turned it on and checked the time and there was no time draft.
And turned it off for one hour and turn it on again.
We repeated the cycle 5~6 times and the RTC draft is still less than 1 second.
We'll turn it off and check the RTC draft again tomorrow morning.

I hope this solution will be helpful for you and your customers.
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Re: RTC IS NOT WORKING PROPERLY...

Unread postby odroid » Thu Dec 07, 2017 11:29 am

We've updated the Android to support the external RTC board officially.
https://wiki.odroid.com/odroid-c1/os_im ... droid/v3.8

If you have any test result, please share it.
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