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Static values in ROM

 
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ckrusen



Joined: 09 Feb 2009
Posts: 12

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Static values in ROM
PostPosted: Tue Feb 10, 2009 10:44 am     Reply with quote
I'm brand new to the PIC and CCSC tools (I have over 20 years with Moto hc05 & hc11, and Cosmic compilers), so please excuse these newbie questions.

How can I store a string (that won't ever get used) in ROM? With other compilers a simple

Code:
const char copyright[]="XYZ (C) 2009";


would do the trick. But the CCSC compiler "optimizes" the code and doesn't include it in the final HEX output.

Using

Code:
#ROM 0x1ff0={'X, 'Y', 'Z', ' ', '(', 'C', ')', ' ', '2', '0', '0', '9'}


causes 4 bytes per character to be stored in ROM.

Any advice would be appreciated,
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Calvin
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Feb 10, 2009 12:51 pm     Reply with quote
Use the 'rom' qualifier instead of const. Example:
Code:
#include <18F452.h>
#fuses XT,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=4000000) 

int8 rom array[] = {"123456"};
   
//====================================
void main()
{

while(1);     
}

The data is placed in high memory, at the end of ROM:
Quote:

:020000040000FA
:1000000002EF00F0F86AD09EEA6AE96AC180C18214
:08001000C184C196FFD7030073
:077FF800313233343536004D
:020000040030CA
:0E00000000210E0E000181000FC00FE00F4026
:00000001FF
;PIC18F452
;CRC=7CD5 CREATED="10-Feb-09 10:37"
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