Time.h with millisecond support for my NTP-Server?

Projects Programming
1

Hi,

i've build my own (S)NTP-Server with an Arduino Mega and and external RF-Timecode Module
that receives EFR-Timecode that is much more accurate than a DCF-Timesignal. So, the time is
accurate down to 1/256s.

I use the Time-Library from the Playground so i have a software-RTC, and do a sync with the
RF-Module every 10 seconds. I need the software RTC to do some other stuff in the background,
the arduino itself has also some other things to do. And i can't request the current time not every
second from the external module, so i need a software RTC...

I also implemented a NTP-Server that receives request from clients and sends back the correct
time with "Daylight saving" (its called summertime here in europe), so all my NTP-Clients allways
have the right time. (i hate that summertime thing) :slight_smile:

So, currently when i receive the actuall time from the rf-module, i took the Subsecond-Information,
do a little delay with that, and than updating the Software-RTC at the next Full Second.

Is there any other Time library out, that can handle Subsecond/Milliseconds too?

Because of this resolution limitation of a second in the current library, i have to delay also my NTP
responses to the client to be in sync with a full second change.

It would be awesome when there would be a library similar to the Time.h, but also with a Subsecond
parameter...

Thanks!

With best regards,
Martin Lang

2

I need the software RTC to do some other stuff in the background,

What background? The Arduino is a single process system. There is no "background".

i took the Subsecond-Information,
do a little delay with that

How is that better than doing nothing if it isn't time. Hint: it ISN'T.

It would be awesome when there would be a library similar to the Time.h, but also with a Subsecond
parameter...

The Time library keeps track of time to better than one second resolution. It simply has no method to report that. So, add one.

3

I tried it, but i can figured it out to work correctly... so maybe someone has still a running Time-Library with subsecond support???

4

I got it, thanks for the hint...

5

I'd be interested if you make any mods to the Time library to support millisecond resolution, I've been thinking along similar lines.

6

Two years later... I added adjustTimeMS() It appears to work fine, but if someone else wants to try it, that would be great.

Time.cpp (9.02 KB)

TimeLib.h (6.51 KB)