RTC on BBB

Hi Guys,

I got a BBB rev C. (w debian). I have connected an esternal battery on the right PMIC inputs, I setting the date/hour, but the processors doesn't remember them. I cannot use an external RTC.

Can You help me.

Thanks a lot

Enrico

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0 fvan over 10 years ago

What do you mean by "I cannot use an external RTC" ?

As far as I know, the BBB does not have an onboard RTC. There is a guide on Adafruit on how to add an external RTC: https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/overview

Other alternatives are to configure NTP in case the BBB is connected to the internet via wifi or ethernet.

Frederick
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0 Former Member over 10 years ago in reply to fvan

Hi Frederick,

I want to use the RTC present on AM3358 (see DS http://www.ti.com/lit/ds/symlink/am3358.pdf) processors.
From the BBB schematic I can see that can use a battery pack, through PMIC, for maintain the RTC in "live" mode....
I tried it but, after reboot, the system has a bad date/time....
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0 Former Member over 10 years ago in reply to fvan

Hi Frederick,

I want to use the RTC present on AM3358 (see DS http://www.ti.com/lit/ds/symlink/am3358.pdf) processors.
From the BBB schematic I can see that can use a battery pack, through PMIC, for maintain the RTC in "live" mode....
I tried it but, after reboot, the system has a bad date/time....
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0 shabaz over 10 years ago in reply to Former Member

Hi Enrico,

The AM335x does have a built-in RTC, but what driver did you use to try to program it and use it? Does the Angstrom or Debian releases support it?
I don't know anyone who has tried to use it on the BBB.
Also, I know a LiPo battery can be used with the BBB's PMIC, but I don't know if a Lithium coin cell is supported - I've not checked the schematic.
I think you'll find an external RTC is way easier, otherwise you'll probably be the one trailblazing here - depends how much time you have.
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