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floating point problems with pic24F

 
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hexfet13



Joined: 03 Jul 2009
Posts: 8

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floating point problems with pic24F
PostPosted: Sat Aug 29, 2009 4:49 pm     Reply with quote
Hi,
I need to write a simple code with some float variable on a PIC24F but just with a simple assignment in mplab sim appears some strange values.
For example this code ....
Code:

#include <24FJ16GA002.h>
#use delay(clock=8000000)

void main()
{ 
   float a;
   a=-1;
   a=1;
   a=0;
}

... produces these results (value column, on watch window in mplab sim):
a=-1 ==> 4.61853961e-041
a=1 ==> 4.60060299e-041
I've tried to declare float32 instead of float, but with the same strange results.


With a PIC18F everything works fine, then...where is the problem?
My compiler version is 4.072

Thanks!!
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Sat Aug 29, 2009 5:07 pm     Reply with quote
It's a MPLAB watch window issue only, see http://www.ccsinfo.com/forum/viewtopic.php?t=39486
hexfet13



Joined: 03 Jul 2009
Posts: 8

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PostPosted: Sun Aug 30, 2009 6:07 am     Reply with quote
Thanks for your reply but there's a chance to set the appropriate floating point format in the "value" column in watch window? (sprintf works fine but is uncomfortable to use it)
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Sun Aug 30, 2009 7:02 am     Reply with quote
As I reported in the linked thread, I was able to set the correct format in MPLAB V8.20. It either doesn't work in some MPLAB versions, or the original poster didn't manage to find the setting. As I have no problems with displaying float watches, I didn't try to clarify the issue. If there's an MPLAB problem, you should contact Microchip.
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