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iepie
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Post subject: rising / faling edge detection  Posted: Sat Jan 28, 2012 11:28 am |
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Joined: Thu Mar 31, 2011 8:07 pm
Posts: 5
Location: The Netherlands
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Hello,
I am trying to detect a rising edge of an input.
Normally when i use PLC controls there is a commando to detect a edge.
how is this done in C or C++ language?
Are there any examples?
thanks in advance.
Patrick
Edit by Admin: Thread moved, obviously wrong Forum.
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Valen
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Post subject: Re: rising / faling edge detection Posted: Sat Jan 28, 2012 1:12 pm |
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Joined: Thu Oct 16, 2008 1:08 pm
Posts: 190
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It depends on the electronics/microprocessor involved. What product are you talking about? Is it one of the robots, or the Arexx measurement products?
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Arexx-Henk
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Post subject: Re: rising / faling edge detection Posted: Sun Jan 29, 2012 8:57 pm |
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Joined: Thu Jun 23, 2005 10:52 am
Posts: 693
Location: Zwolle
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hi,
you will always have to remember the last state.
if current-state is 1 and last-state is 0 then (remember current-state as last-state) a rising-edge has occurred.
if current-state is 0 and last-state is 1 then (remember current-state as last-state) a falling-edge has occurred.
if current-state unequals last-state then (remember current-state as last-state) an edge is detected.
Henk
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