B4R Question ESP8266: TimeNIST + RTC timer + DeepSleep ~ clock

[peacemaker]

HI, All

Is it possible to have not-super-sharp-clock using TimeNIST (get time, say, one time per week) and RTC timer and memory to calculate the current time after DeepSleep ?
Experimenting with RTC-memory read-write i found that "RTC time" from system_get_rtc_time() function after returning from DeepSleep is always Get rtc time around values of 12000......16000.
I cannot understand - if the module is power up, but use DeepSleep periodically - the RTC timer should go on all the time, and return bigger values ...
Or i do not understand something... how to use correctly DeepSleep and calculate time of this sleeping ?

 

[tigrot]

I never tested internal rtc. Normally the rtc must be Initialized, then started. The last operation starts rtc count. I think this is true for your case as well.

 

[peacemaker]

But why RTC time after DeepSleep is not proportionally bigger than before ? No more than ~16000.
I guessed, it should tick all the time while powered up. And if 1 min in DeepSleep - after resume the value should be > 60 seconds

 

[tigrot]

Found. Esp8266 doesn' t have an internal rtc.

 

[tigrot]

https://www.b4x.com/android/forum/threads/8266-rtc-memory-other-information.107753/
May help you.

 

[peacemaker]

I used exactly this code to try. Many articles on the internet describe that RTC exists, but coplex.... But cannot be found normal example.
OK, i will use just a incremental counter in this RTC memory...

But here is interesting site: https://nodemcu.readthedocs.io/en/release/modules/rtctime/#rtctimedsleep

 

[tigrot]

Tried to use in online C?

 

[peacemaker]

Hmmm, yes, as in those example, how another, most of native functions in B4R we use via inline C.

 

[derez]

You can get time from NIST with the limit that it must be not less than once in 4 seconds. I have a clock running with getting time from Nist every few minutes and a timer of 1 second to advance the time, not RTC. After wake up get time from NIST and continue.

 

[peacemaker]

not less than once in 4 seconds

Thanks for info. But for batch of devices under shared WiFi IP address it will be rather often anyway, devices are asyncronouse..