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how to make look up table

 
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butterfly



Joined: 04 Jun 2006
Posts: 35

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how to make look up table
PostPosted: Tue Jun 06, 2006 2:49 am     Reply with quote

�'m new in CCS.
I WANT TO MAKE A LOOKUP TABLE. LIKE THAT ASEMBLY.

Saltprog
BANKSEL SSAYICI
MOVFW SSAYICI
Addwf PCL,F
RETLW 0xFF
RETLW 0xFF
RETLW 0xFF
RETLW 0xFF
RETLW 0xFF
RETLW 0xFF
RETLW 0xFF
RETLW 0xFF


ANY ADVICE YOU CAN GIVE ME??
Ttelmah
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PostPosted: Tue Jun 06, 2006 4:37 am     Reply with quote

const int8 val[] = {1,2,3,5,6,7,8};

Then if you access 'val[n]' where 'n' is 0 to 6 in the example given, you get the value requested (you would need '0xff' in each location for the example you show). This generates exactly the version shown in your assembler, for a PIC 12/16 chip (on the 18 chips, the ability to directly access the program memory is used instead, allowing two bytes to be packed per instruction).

Best Wishes
butterfly



Joined: 04 Jun 2006
Posts: 35

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PostPosted: Tue Jun 06, 2006 6:36 am     Reply with quote

i have write

BYTE CONST TABLE [10]= {9,8,7,6,5,4,3,2,1,0};

that error mesaje happen:

a numaric expression must appear here

i could not understand why?

thanks for help
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Tue Jun 06, 2006 6:48 am     Reply with quote

Code:
BYTE CONST TABLE [10]= {9,8,7,6,5,4,3,2,1,0};

change to
Code:
const BYTE TABLE[10]= {9,8,7,6,5,4,3,2,1,0};
Ttelmah
Guest







PostPosted: Tue Jun 06, 2006 6:49 am     Reply with quote

There is nothing wrong with the line as typed. It is probably something on the line(s) in front.
Remember this a 'declaration', and wants to be either outside the code, or at the start of a routine.

Best Wishes
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