I have a machine with an RTC.
For the sake of..... (something), I compare it to the software one at regular intervals.
(Say 20 seconds)
To help keep things simple with the maths (and size of numbers) I resolve it down to "Seconds past midnight.
This may have a problem when Daylight savings kicks in, but more on that later.
Usually I am not seeing much of a problem, but nowadays I have recently hooked up an LED (physical one) and when a disparity is detected the LED comes on.
Of course there is the bad side to that. It seems to come on a fair bit.
I have the drift/acceptable slip set at 60000 and that seems to keep things happy most of the time.
But this morning when I got up there was an NTP SLIP indication.
{"sw_time":966047,"rtc_time":1002016,"difference":35969,"_msgid":"1fce9e63.9c74a2","time":"2020-09-05 03:21:28","ttl":0,"_queuetimestamp":1599240098742,"_queueCount":1}
But I am needing someone to help me scale these numbers.
How much is 1002016?
How much is 60000?
Yeah probably easy questions. But I feel I have to ask.
Thanks in advance.
Further research is that it is milliseconds.
So: 60000 is 6 seconds - yes?
1002016 is about 16 minutes - yes?
