low gitter timer
 

Hi,

I started some days ago on Mini2440 (arm) running debian 2.6.29 and loaded with Qtopia 2.2. I would like to design program with precise timer(milli to 10 milli seconds step) with low gitter. Have somebody example or recommandations?

Happy new year to all.

If you mean jitter, spell it that way in the title, otherwise people will assume this post is about something else that they have never heard of.

Depending on how big jitter could be acceptable on you system, if you can afford a good precision most of the time and sometime a big shift, what is the cpu usage, do you need an absolute accuracy of the period or just regularity...
For a reasonable need, if hpet are availables, you could have a 'not too bad' regularity (something like 100us most of the time under low CPU usage). If you want to have an absolute timing interval, add a PPS support (you'll need a GPS or other hardware), you can try PTP or even NTP.
If you cant afford glitches, an hard real time scheduler will be necessary, adeos-xenomai looks like the way to go if you still want a linux system...