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Post subject: Update trend data on vertical refresh or retrace?
 Posted: Mar 25, 2007 - 05:04 PM
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New Member
Joined: Jun 18, 2003
Posts: 7
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I have a thread pulling in several channels of cardiac like data that I'd like to update on the screen in a scrolling window - like a standard EKG (ECG) display.
The most efficient thing to do is to just update the trend data every screen refresh - any faster is a waste - and causes extra overhead. I have found no references to attaching a handler to the vertical retrace interrupt. Is this possible with a standard x86 type system with an ATI Radeon graphics card. Is it possible? If not, I guess that I could just run of a timer at the refresh rate (say 60 Hz).
Is it possible to get the trend data smooth scrolling? I.e. new data comes in on the right, and pushes the old data off to the left.
Thanks! |
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Post subject: RE: Update trend data on vertical refresh or retrace?
Posted: Mar 25, 2007 - 07:44 PM
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QNX Master
Joined: Sep 01, 2002
Posts: 2831
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| To my knowledge there is no facility in Photon that provides this features. |
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Post subject: RE: Update trend data on vertical refresh or retrace?
Posted: Mar 26, 2007 - 07:47 PM
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New Member
Joined: Jun 18, 2003
Posts: 7
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Thanks Mario - I assume you are referring to attaching to the vertical retrace interrupt  |
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Post subject: RE: Update trend data on vertical refresh or retrace?
Posted: Mar 26, 2007 - 08:08 PM
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QNX Master
Joined: Sep 01, 2002
Posts: 2831
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