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lookup table

 
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mojsa2000



Joined: 18 May 2010
Posts: 78

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lookup table
PostPosted: Sun Oct 16, 2011 3:12 am     Reply with quote
Hi
I want to make a look up table with 201 numbers. By CONST definition I made it but only 128 numbers is returned in main program. Please help me about maximum of look up table's elements.
My chip is PIC16f877 with 256 x 8 bytes of EEPROM Data Memory
Code:

int16 const num[]={               
0,0,0,0,1,1,2,2,3,4,5,6,7,8,10,11,13,14,16,18,20,22,24,26,28
,30,33,35,38,41,44,46,49,53,56,59,62,66,69,73,76,80,84,88,92
,96,100,104,108,113,117,122,126,131,135,140,145,150,155,160
,165,170,175,180,186,191,196,202,207,213,218,224,230,235,241
,247,253,
259,265,270,276,282,288,294,301,307,313,319,325,331,337,344,350,
356,362,369,375,381,387,394,400,406,413,419,425,431,438,444,450,
456,463,469,475,481,487,493,499,506,512,518,524,535,541,547,553,
559,565,570,576,582,587,593,598,604,609,614,620,625,630,635,640,
645,650,655,660,665,669,674,678,683,687,692,696,700,704,708,712,
716,720,724,727,731,734,738,741,744,747,751,754,756,759,762,765,
767,770,772,774,776,778,780,782,784,786,787,789,790,792,793,794,
795,796,797,798,798,799,799,800,800,800,800};

thanks
temtronic



Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario

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PostPosted: Sun Oct 16, 2011 6:39 am     Reply with quote
Have you the following line...

#device PIC16F877 *=16


The '*=16' allows 16 bit pointers....which may allow the table to be accessed ( page boundary issues).
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Oct 16, 2011 2:13 pm     Reply with quote
Quote:
int16 const num[]={

Please help me about maximum of look up table's elements.
My chip is PIC16f877 with 256 x 8 bytes of EEPROM Data Memory

Your table is stored in Flash program memory. This is what the 'const'
declaration does. It is not stored in data eeprom.

Next, there is a limit in the 16F compiler of 256 bytes per const array.
You are trying to make a large array of int16 values and that is causing
the error message.

These threads discuss the problem and explain a solution:
http://www.ccsinfo.com/forum/viewtopic.php?t=36068
http://www.ccsinfo.com/forum/viewtopic.php?t=36847
http://www.ccsinfo.com/forum/viewtopic.php?t=29898


Quote:
#device PIC16F877 *=16

This applies to RAM, not to Flash program memory. It doesn't affect
const arrays.
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