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Warning related Question

 
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bells_electronics



Joined: 05 Dec 2009
Posts: 40

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Warning related Question
PostPosted: Fri Apr 08, 2011 12:47 pm     Reply with quote
hey guys

when i use float variables in interrupt i get this warning

Quote:

>>>Warning 216"Bells.c" Line 410(0,1): Interrupts disabled during call to prevent re-entrancy: (@FLT)
Memory usage: ROM=15% RAM=6% - 9%
0 Errors, 1 Warnings



is it OK
???? what does it means ??
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 08, 2011 1:17 pm     Reply with quote
http://www.ccsinfo.com/forum/viewtopic.php?t=43264
http://www.ccsinfo.com/forum/viewtopic.php?t=30539
Ttelmah



Joined: 11 Mar 2010
Posts: 19499

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PostPosted: Fri Apr 08, 2011 2:37 pm     Reply with quote
Add the points about _time_. Float arithmetic is slow, you really don't want this sort of time delay in an interrupt. see if you can consider using scaled integer arithmetic instead (still need to duplicate the arithmetic library to avoid the error, but a much better chance of things not going wrong....).
In the manual 'Common questions and answers;, 'How much time to math operations take', and then scream gently, when thinking about handling things in interrupts.....

Best Wishes
temtronic



Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario

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PostPosted: Sat Apr 09, 2011 5:47 am     Reply with quote
Poor little PICs, seems everyone wants them to 'do the near impossible','yesterday','faster than a speeding bullit'...
They really weren't originally designed for this life !
But, they do math faster than me with pencil and paper when 3 phones are ringing off the hook ! It's all a matter of perspective.
Interrrupts ? Get in, set a flag(or 2), get out, end of ISR code......
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