Date set / get

Hardware
1

I am designing a timer board needs precise time and calendar functions regardless of Internet availability. There is a particular case, where an IMP can reboot and wake up to a dead  Internet connection (thus no time capabilities). 


I can use a rather cheap RTC + Xtal, but it seems that I am not able to set the date back into the IMP.

What is the correct way to deal with such problems?

Thanks!
2

That’s not currently possible. If the imp has power, it will retain the RTC regardless of whether it’s awake or not - and if you have power for the external RTC, don’t you have power for the imp?


3

Thank you for the suggestion. 


>and if you have power for the external RTC, don’t you have power for the imp?
I have a CR2032 backup battery, if I consume > 20mA battery will get damaged. 

I can detect falling PSU, but is there a very fast method to put the IMP to sleep? Can the wakeup pin be configured for sleep function as well?  :)

I need something that reacts very fast (few ms at most)…




4

Sorry to bring up an old thread, but is it yet possible to set the date/time of the imp to an RTC date/time? Thanks!

5

No, but if you have an RTC attached to your imp, you can just read that as your timebase and calculate an offset to add to/subtract from any time-based calls you make to the imp API, eg. server.sleepuntil()