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kenho
Joined: 28 Jun 2013
Posts: 5
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| #ROM |
 Posted: Fri Jun 28, 2013 9:54 am |
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Hi Everyone, first time here! 
I get a warning after the second #ROM 'Memory not available at the requested location'. Should I just ignore it? Any suggestions?
| Code: | #include <24EP512GU810.h>
#include <stdlib.h>
#include <math.h>
#fuses NOWDT,PUT64,NOBROWNOUT,ICSP1,NOJTAG,NODEBUG,NOAWRT,NOAPROTECT
#fuses NOWRT,NOPROTECT,FRC_PLL,PR_PLL,NOIESO,NOPR,NOCKSNOFSM
#use delay(clock=58960000)
void main()
{
int8 ii = 0;
setup_oscillator(OSC_INTERNAL);
if(ii == 0) #ROM char 0x55000 = {'R','C','O'}
else #ROM char 0x55000 = {'r','C','O'}
} |
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stinky
Joined: 05 Mar 2012
Posts: 99
Location: Central Illinois
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| Posted: Fri Jun 28, 2013 10:26 am |
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| I don't have experience with this part, but I'd probably check the data sheet to see if that address is in fact open to use. |
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kenho
Joined: 28 Jun 2013
Posts: 5
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| Posted: Fri Jun 28, 2013 10:41 am |
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Thanks Stinky!
It does appear as writable program memory in the data sheet. I do not get the warning if I use the #ROM at that address just once, only when repeated in the code.
It is a warning and not an error so perhaps the warning algorithm only looks for repeats but does not take context into account. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19569
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| Posted: Fri Jun 28, 2013 10:41 am |
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The problem is what you are doing.....
#ROM, is _not_ a program instruction. It can't be executed at run time.
It is a preprocessor directive, executed when the code is compiled.
You can't change #ROM at runtime.
You can have two versions changed when you compile:
| Code: |
#define II
#ifdef II
#ROM char 0x55000 = {'R','C','O'}
#else
#ROM char 0x55000 = {'r','C','O'}
#endif
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If you rem out the define, the second ROM directive will get compiled, but if you leave it defined, then the first will get compiled.
Best Wishes |
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kenho
Joined: 28 Jun 2013
Posts: 5
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| Posted: Fri Jun 28, 2013 2:12 pm |
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Thanks Ttelmah!
Understood.  |
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