Review your favorite Linux distribution.
Go Back > Forums > Linux Forums > Linux - Mobile
User Name
Linux - Mobile This forum is for the discussion of all topics relating to Mobile Linux. This includes Android, Tizen, Firefox OS, Sailfish OS, Maemo, MeeGo, Ubuntu Mobile, WebOS, Open Mobile Alliance and other similar projects and products.
A reminder that LQ now has a dedicated Android sister site:


  Search this Thread
Old 01-10-2010, 03:26 AM   #1
LQ Newbie
Registered: Jan 2010
Posts: 1

Rep: Reputation: 0
low gitter timer


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
Senior Member
Registered: Jul 2007
Location: Directly above centre of the earth, UK
Distribution: SuSE, plus some hopping
Posts: 4,064

Rep: Reputation: 893Reputation: 893Reputation: 893Reputation: 893Reputation: 893Reputation: 893Reputation: 893
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
Registered: Apr 2008
Location: Toulon (France)
Distribution: FEDORA CORE
Posts: 493

Rep: Reputation: 50
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...


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
make a command in bash with low priority ( low server load) m_abdelfattah Linux - Newbie 1 07-25-2009 09:29 AM
How can I get LAPIC timer to run instead of the PIT timer? sixerjman Linux - Kernel 1 10-16-2007 09:59 PM
Multimedia timer (SMP friendly timer) bigqueso Linux - Kernel 0 03-15-2007 03:49 PM
"System timer resolution is set too low..."any help out there? Thanks ubuntuuser1 Linux - Software 8 03-03-2007 05:16 PM
LXer: NCS Introduces Ultra-Compact, Low-Cost, Low-Power and Super-Quiet Set-top Server Appliance Platforms LXer Syndicated Linux News 0 01-29-2006 08:01 PM > Forums > Linux Forums > Linux - Mobile

All times are GMT -5. The time now is 05:57 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration