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Very large (>64k) constant data table in program memory

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Bill

Joined: 19 Aug 2005
Posts: 2

Very large (>64k) constant data table in program memory

Posted: Fri Aug 19, 2005 10:54 am

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I am trying to put a 54k pixel x 16 bit image into the PIC18F6722, (which has 128kb program memory).
I have attempted to do this using the #ORG and #ROM statement as follows:

Code:

#ORG 0x0400, 0xFFFE {}
#ORG 0x10000, 01BFFE {}
#ROM 0x400={0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800}
#ROM 0x420={0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800, 0x0000, 0xf800}
etc.

but a compiler limit is reached. I'm using version 3.230.

I've also tried doing it in bytes using

Code:

#ROM int8 0x400={00, 00,
etc..

which behaved differently, compiled, but missed out part of the image from the hex file.

I'm using #ROM rather than a c array, because the implementation of const c arrays is odd, and unsuitable for the purpose.

The code (thousands of lines), needless to say, is auto-generated. I could generate it as a hex file and add it to the hex file generated by the compiler, but I'd like the compiler to do some of the work!

Any ideas, anyone?

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Fri Aug 19, 2005 11:46 am

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Quote:

but a compiler limit is reached. I'm using version 3.230.

What is the exact error message ?

Bill

Joined: 19 Aug 2005
Posts: 2

Posted: Tue Aug 23, 2005 2:39 am

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PCM programmer wrote:

Quote:

but a compiler limit is reached. I'm using version 3.230.

What is the exact error message ?

Thanks for your reply.
The error message is:
Error[113] C:\My Documents\code\8199_project\composite9.h 1093 : Internal compiler limit reached

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