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CRC tables

 
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Eeprom_programmer



Joined: 07 Aug 2007
Posts: 24

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CRC tables
PostPosted: Thu Aug 23, 2007 2:29 pm     Reply with quote

Need help!

I am currently busy implementing MODBUS, but when I include my CRC tables I get a error - not enough ram available.

I am using the pic16f883
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Aug 23, 2007 3:00 pm     Reply with quote

When you ask a question like this, you need to:

1. Tell us what Modbus driver you're using. Post the filename.
Tell us if it's the CCS driver or the one from the Code Library.
If you found it on the net, then post the link.

2. Post the first line of the CRC table declaration, that shows the size
of the elements (int8, or int16, etc.) and the number of elements
in the table.

3. Tell us if you have already enabled 16-bit RAM pointers in your
PCM compiler program (not needed for PCH). This is done with
the following statement placed just after the #include <16F883.h>:
Quote:
#device *=16


4. Tell us your compiler version.

In other words, if you're asking a detailed question, you need to give us
detailed information about the problem, and do it up front in your 1st post.
Eeprom_programmer



Joined: 07 Aug 2007
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PostPosted: Fri Aug 24, 2007 2:56 am     Reply with quote

I am not using a modbus driver, I wrote my own modbus code.
Compiler version is v4.033. I am declaring it as a static unsigned char, is there a possiblity that is can save it in the program memory?

// High Order Byte Table


static unsigned char crcTable[256] =
{
}

[/code]
Foppie



Joined: 16 Sep 2005
Posts: 138
Location: The Netherlands

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PostPosted: Fri Aug 24, 2007 7:49 am     Reply with quote

Eeprom_programmer wrote:
I am declaring it as a static unsigned char, is there a possiblity that is can save it in the program memory?

Yes, declare it as const and it will be stored in ROM.

Cheers, Jos
Eeprom_programmer



Joined: 07 Aug 2007
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PostPosted: Fri Aug 24, 2007 9:44 am     Reply with quote

thanks alot it fixed the problem
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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PostPosted: Fri Aug 24, 2007 11:14 am     Reply with quote

This thread is somewhat informative.

http://www.ccsinfo.com/forum/viewtopic.php?t=18922&highlight=crc
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