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Old 01-10-2010, 03:26 AM   #1
icoms
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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.
 
Old 01-11-2010, 04:20 AM   #2
salasi
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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.
 
Old 01-11-2010, 03:33 PM   #3
jf.argentino
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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...
 
  


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