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compiler question

 
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compiler question
PostPosted: Thu Aug 09, 2007 9:15 am     Reply with quote

Is there an arbitrary do not exceed number for data objects?
specifically a structure called test of size say 20 bytes declared as such


const struct test[size];

is there a limit to size ? other than the obvious memory constraints.
are there page boundary issues?
SherpaDoug



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PostPosted: Thu Aug 09, 2007 10:47 am     Reply with quote

Any function or data object must fit in one memory page. The size of a page depends on the PIC you choose.
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ckielstra



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PostPosted: Thu Aug 09, 2007 11:51 am     Reply with quote

SherpaDoug wrote:
Any function or data object must fit in one memory page. The size of a page depends on the PIC you choose.
This is true for PIC16 and smaller processors, also note that for these chips not all pages are the same size.

PIC18 chips are much more relaxed in this respect and as far as I know the only limit is the amount of free RAM. My largest array is 512 bytes and this works great. The first PIC18 compiler versions had a size limit of 256 bytes and this was in the manuals for a long time even after it was fixed (before I started using this compiler, i.e. before v3.187).
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