To answering myself: I think nothing wrong with DS32XX. I hooked up GPS
1PPS output to the same timer (different channel) where I have 1PPS from
RTC. Now I see something like this.
# Delta GPS: 7330, Delta RTC: 7330
# Delta GPS: 7330, Delta RTC: 7329
# Delta GPS: 7330, Delta RTC: 7329
# Delta GPS: 7330, Delta RTC: 7330
# Delta GPS: 7330, Delta RTC: 7330
# Delta GPS: 405, Delta RTC: 705
# Delta GPS: 405, Delta RTC: 705
# Delta GPS: 7330, Delta RTC: 7330
Definitely something wrong with my code or the way how MCU handle
different events (interrupts).
Reggards,
V.P.
On 2014-02-25 17:32, Tom Van Baak wrote:
I would like to ask if somebody did measurement for that Dallas DS32XX
series chips. Is that 1PPS (1HZ square wave) stable there or it has
some
issues ? I am thinking that "burp" in my tests could be because of my
poor code or may be because of DS32XX doing temperature conversion
every
second, which cause an impact to the 1HZ output. I would be interested
to hear any information about. From the datasheet of DS3231m , that
1HZ
from DS32XX should be stable.
Both the GPS and DS32XX 1PPS should be fine. Are your free-run
counters really free? It looks like a simple bug in your code.
All this is very easy to debug if you have even the most basic
frequency or time interval counter available to independently validate
the GPS or the DS32XX 1PPS interval.
/tvb
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--
WBW,
V.P.
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