Re: [ts-7000] Re: 983.04 Khz timer

["Don W. Carr" <>]

I have been running my 7260 now for about 8 hours since setting both the system clock with date, and the battery backed real-time clock with hwclock to my atomic clock that synchronizes every night. It appears that the battery-backed real-time clock is right on, but the system clock has lost about 4 seconds in 8 hours (not good). I have an application where I need to know with max 1 second error when a train crosses a sensor.

Below you can see I ran hwclock and date at the same time, right at the top of the minute.

$ hwclock ; date
Mon Apr 17 20:10:00 2006  0.000000 seconds
Mon Apr 17 20:09:56 UTC 2006
$

When I started the test, they both read exactly the same.

Any ideas on how to keep the system clock in better sync? I would like these systems to stay within 1 second even if they are disconnected from the net for 24 hours.

Don.

On 4/17/06, Yan Seiner <> wrote:

--- In "Don W. Carr" <> wrote: 
> 

> Well, yes, for most applications the computers will be network 
> attached and I can use ntp. But, that brings up the other 
question, 
> should I periodically run "hwclock --systohc" so if the computer 
> reboots, it will come up at the right time? Or does ntp handle 
that? 
 

Well, I was thinking of reference clocks....  But I see from reading 
the ntp docs that it's not what I thought.... 
 
What is really needed is an ntp refclock driver for the TS RTC....  
I have no idea how hard it would be to implement one... But seeing 
as you can use NMEA messages and a pulse for refclocks it should not 
be impossible.  Basically make it emulate a GPS signal. 

 
>  
> Does anybody have the ntp client compiled for the Arm boards 
(TS-Linux)? 
 

Not yet.... 
 
--Yan 

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Dr. Don W. Carr
J. G. Montenegro 2258
Guadalajara, Mexico
+52-333-630-0704
+52-333-836-4500 ext 2930

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