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Out of rom error on 16f877a

 
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TIMT



Joined: 02 Sep 2005
Posts: 49
Location: Nottingham, UK

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Out of rom error on 16f877a
PostPosted: Thu Oct 13, 2005 3:07 am     Reply with quote
Any suggestions? I'm using 88% of rom on my 16f877a project. If I add just one more call to a function i get an "out of rom error" I've seen this mentioned before on the forum. I added #seperate before the function and its prototype as was suggested but now get an error message "invalid pre-processor directive memcpy" I'm moving up to a 18f452 with more memory, hopefully this will cure the problem but it may not... Anyone know a quick fix? I have a lot of fairly large functions and the main is fairly big. Most of my functions are called only once at the moment, so are probably inline, if I start calling them more than once and are placed seperate could this cause further stack/memory problems? Confused

Code:

 main
  Seg 01000-017FF, 0406 left, need 072F
   0000
  Seg 01800-01FFF, 0800 left, need 0889
   0000
  Seg 00000-00003, 0000 left, need 0889
   0000
  Seg 00004-007FF, 000A left, need 0889
   0000
  Seg 00800-00FFF, 0036 left, need 0889
   0000
  Seg 01000-017FF, 0406 left, need 0889
   0000

*** Error 71 "C:\Program Files\PICC\TIM1.c" Line 1333(0,1): Out of ROM, A segment or the program is too large   delay_ms
Halting build on first failure as requested.
BUILD FAILED: Thu Oct 13 09:42:59 2005


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Tim
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PostPosted: Thu Oct 13, 2005 3:15 am     Reply with quote
this link might help
TIMT



Joined: 02 Sep 2005
Posts: 49
Location: Nottingham, UK

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out of rom error
PostPosted: Thu Oct 13, 2005 3:35 am     Reply with quote
Thanks for your reply, I am using a lot of short seperate printf("ABC"). I think this may the best place to start economising. After that, I think it's probably best to move up to a 18f452. Do you think using a 18f452 will cure the problem or will I have code which will not fit into one segment?
Thanks again for your help.
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Tim
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