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ntpd versus rtc
OpenQNX Forum Index » General » QNX Newsgroups » qnx.rtos
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txdoesker
Post subject: ntpd versus rtc  PostPosted: Jan 24, 2008 - 03:34 PM
New Member


Joined: Dec 11, 2007
Posts: 2
Hi all,

is it possible to let qnx ntpd interact with rtc?

My QNX System is not connected to the web all the time.
If ntpd has synchronized the system time from a time server in the web,
I want to set the rtc with this accurate time.
If the system is offline, I want to synchronize the system time with the
rtc.

Is this possible?
If yes, how to connect the rtc to the ntpd?
Must I provide a resource manager, providing something like "/dev/rtc"?

Thanks in advance
Michael
 
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Mario Charest
Post subject: Re: ntpd versus rtc  PostPosted: Jan 31, 2008 - 02:03 AM
Guest
"Michael Tasche" <michael.tasche@esd-electronics.com> wrote in message
news:gpnm65-l7p.ln1@comm.esd...
Quote:
Hi all,

is it possible to let qnx ntpd interact with rtc?

My QNX System is not connected to the web all the time.
If ntpd has synchronized the system time from a time server in the web, I
want to set the rtc with this accurate time.
If the system is offline, I want to synchronize the system time with the
rtc.

Is this possible?
If yes, how to connect the rtc to the ntpd?
Must I provide a resource manager, providing something like "/dev/rtc"?


I'm not familliar with nptd but just setup a cron job to call "rtc -s hw" at
regular interval.

Quote:
Thanks in advance
Michael
 
   
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Kevin Miller
Post subject: Re: ntpd versus rtc  PostPosted: Feb 01, 2008 - 08:40 PM
Guest
ntpd will "discipline" the system clock when the time server is not
available. It calculates the local clock error, and corrects for it in
between synchronizations. However, it does not do anything with the
hardware clock, which is why you have to do "rtc -s hw" periodically.

Mario Charest wrote:
Quote:
"Michael Tasche" <michael.tasche@esd-electronics.com> wrote in message
news:gpnm65-l7p.ln1@comm.esd...
Hi all,

is it possible to let qnx ntpd interact with rtc?

My QNX System is not connected to the web all the time.
If ntpd has synchronized the system time from a time server in the web, I
want to set the rtc with this accurate time.
If the system is offline, I want to synchronize the system time with the
rtc.

Is this possible?
If yes, how to connect the rtc to the ntpd?
Must I provide a resource manager, providing something like "/dev/rtc"?


I'm not familliar with nptd but just setup a cron job to call "rtc -s hw" at
regular interval.

Thanks in advance
Michael

 
   
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