Community/Discussion/QNX4 Community Support (EOL)/ClockPeriod questions about arguments/List of Posts
 
Forum Topic - ClockPeriod questions about arguments: (3 Items)
   
Update
gheroghe vintila
03/27/2010 9:12 AM
post50619
ClockPeriod questions about arguments   
How small could I make the clock period and what consequences can arise from setting a smaller that 1ms clock? And if i 
set  a clock of 500 microseconds does that make the jitter smaller, for a gpio toggle of 1 milisecond done with timers.
Thanks,
George Vintila
Mario Charest
03/27/2010 2:23 PM
post50629
RE: ClockPeriod questions about arguments   

> -----Original Message-----
> From: gheroghe vintila [mailto:community-noreply@qnx.com]
> Sent: March 27, 2010 9:12 AM
> To: qnx4-community
> Subject: ClockPeriod questions about arguments
> 
> How small could I make the clock period and what consequences can arise
> from setting a smaller that 1ms clock?

Increase CPU usage.

> And if i set  a clock of 500
> microseconds does that make the jitter smaller, for a gpio toggle of 1
> milisecond done with timers.

Depends what causes the jitter and how your program is designed.

> Thanks,
> George Vintila
> 
> 
> 
> _______________________________________________
> 
> QNX4 Community Support
> http://community.qnx.com/sf/go/post50619
>
gheroghe vintila
03/28/2010 8:54 AM
post50641
Re: RE: ClockPeriod questions about arguments   
First off all thanks for help, and secondly i want to give more information about the program:
The program settings are explained in my other post :    http://community.qnx.com/sf/discussion/do/listPosts/projects.
community/discussion.qnx4_community_support.topc12867  

What are the possible causes of the jitter after applying the settings described in the other post? I must be missing 
something because i cant believe that the jitter is normal.

Does it reduce the jitter if i set the timer period to the period of the signal that i want to put on the GPIO PIN?

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