On Sun, January 13, 2008 3:13 pm, John Shaffer, PhD wrote:
> I'm having similar trouble with the real-time-clock as some other posts
> but the suggestions there did not fix the problem. I did indeed order
> the 7800 with the RTC option. I'm guessing its the black component
> labeled 23676 on the board.
Maybe your eyes are better then mine, but I don't see any components
labeled "23676"... (oh, and most of the components are black :-)
The RTC would be much taller then all the other chips on the board; it is
almost as tall as the RS-232 DB9 connector. It should be labelled
"M48T86PC1 REAL-TIME CLOCK". Here is an image without the RTC:
http://www.embeddedarm.com/images/7800stcllw.jpg (the RTC goes where the
open holes near the DB9 connector)
> I see no battery and thus assume its inside
> that box. I also downloaded the updated rtc7800 utility and used that
> version ( md5 sig: 9f8c7d100956fc649d5acfe6653ccff3 )
>
> Symptoms:
>
> * rtc7800 (with or without -s option) returns with /Register A was:
> 20/
This suggests the RTC is present and running.
> * hwclock --show returns /The Hardware Clock registers contain
> values that are either invalid (e.g. 50th day of month) or beyond
> the range we can handle (e.g. Year 2095)./
> * The above happens even after ==># rtc7800 -s -- Seems like
> rtc7800 has no effect...ever
rtc7800 should be used instead of hwclock, hwclock will not work on the 7800.
> * /ntpdate ntp.server.wherever/ works and sets time properly
> (tzselect works as well)
> * a subsequent call to ntpdate after 1 minute shows a correction of
> about 2 seconds. Yes, 2 s for every minute of wall clock time.
> * /hwclock --systohc/ seems to have no effect -- same as /rtc7800/
> * Contents of /etc/adjtime (if its useful);-/0.152558 1200190483
> 0.000000
> 1200190483
> UTC/
> * old //usr/local/bin/rtc7800/ (has md5sum:
> c3ca375b3c8d7c852fd99fcd16b97bfb -- sarge install) behaves ame as
> the new one
The only difference between the two is that the new one checks to make
sure the RTC has been activated at the start of each run.
> It behaves as if there is no RTC on board. However, the utility does
> *not* complain of "no RTC found", seems it finds it OK (see Reg A
> retval). Its almost as if the RTC is just plain broken.
>
> Anyone have any similar experiences with the RTC on 7800 or can point me
> to something I may have missed?
Can you run the following commands and send the output?
date
ntpdate ntp.server.wherever (obviously modify as needed to make it work)
date
rtc7800 -s
reboot
rtc7800
date
> Thanks,
> John
> ------------------------------------------------------------------------
> John H Shaffer PhD
> Managing Partner
> 507-252-8927
>
> Lakota Innovations LLC
> 2015 Valkyrie Dr NW
> Rochester, MN 55901
>
> ------------------------------------------------------------------------
______ Best Regards,
|__ __/ Michael Schmidt
|| Software Engineer
||echnologic Systems (EmbeddedARM.com)
|| (480) 16610 East Laser Drive #10
|/ 837-5200 Fountain Hills, AZ 85268
http://oz.embeddedarm.com/~michael
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|
