What's the maximum number of elements in a table?

I need to store approx 300 words elements (600 bytes) in a table.

It looks like Lookup2 craps out at 256 words, and Lookup does the same at 256 bytes.

Any workarounds? (That EXT modifier looks kinda scary)

Quote:

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Originally Posted by J. Mark Wolf

I need to store approx 300 words elements (600 bytes) in a table.

It looks like Lookup2 craps out at 256 words, and Lookup does the same at 256 bytes.

Any workarounds? (That EXT modifier looks kinda scary)

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One work around is to use two lookup2 statements. Placed one right after the other.

Example, 150 in each words table,

Code:

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Gosub MYTABLE


MYTABLE:

        If INDEX > 150 then MYTABLE2

        LOOKUP2 INDEX, [1,....150],VAR

        goto endtable

MYTABLE2:
                INDEX = INDEX - 150

        LOOKUP2 INDEX,[151...300],VAR

endtable:

        Return

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Quote:

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Originally Posted by mark_s

One work around is to use two lookup2 statements. Placed one right after the other.

Example, 150 in each words table,

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Thanks Mark_S

I was able to re-scale the table down into 253 words and LOOKUP2 is fine with it.

So, is 256 words a hard limit for PB Pro?

The holy manual says "Up to 255 (1024 for pic18fxxx) constants are allowed in the list" thats for Lookup.

Lookup2 it states "Up to 85(1024 for pic18fxxx) values are allowed in the list"

So, I guess it depends on what pic you are using 18f or 16f?

Quote:

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Originally Posted by mark_s

The holy manual says "Up to 255 (1024 for pic18fxxx) constants are allowed in the list" thats for Lookup.

Lookup2 it states "Up to 85(1024 for pic18fxxx) values are allowed in the list"

So, I guess it depends on what pic you are using 18f or 16f?

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I saw that also, after creating my LOOKUP2 table, but I'm using the new 16F1827, and the compiler didn't start balking until I got over 255 or 256 words (can't remember which).

I whittled the table down to 253 words, and it's compiling fine. I figured there'd been an "undocumented capacity update" since the manual was last printed.

I haven't yet down loaded any code to the device so we will see what happens then.

Quote:

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Originally Posted by mark_s

The holy manual says "Up to 255 (1024 for pic18fxxx) constants are allowed in the list" thats for Lookup.

Lookup2 it states "Up to 85(1024 for pic18fxxx) values are allowed in the list"

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I posed the question to tech support.

According to Darrel, the limit for LOOKUP2 and 16F parts has been bumped to 256 elements.

That's good news for my application!