[ECOS] Re: Time problem: Clock running slow
Fri Sep 3 14:21:00 GMT 2010
thanks very much for the comments (and sorry for not answering every
Meanwhile we found the reason. =) Special thanks to Frank.
Yes, we use a crystal (Dallas-chip) RTC which works fine. When I query it
directly for getting the current time it is always correct (no delay after
many hours). But since access is (too) slow (I2C) we use that
So the problem must have been on the target.. It was a wrong CPU I/O bus
speed, it is not 266 but 264 MHz. Since this value is used for calculating
the real-time clock period we got 66500 instead of 66000. This was exactly
the range of the time drift.
So everything was fine with interrupts.
(The timer should be a bit more precise since our machines can have uptimes of
months or more - and that delay would lead to an error of nearly 2,5 days per
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