AVR eeprom access

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Ben Stuyts

• September 11, 2009 15:39

Hi,

 

What's the best way to access the on-chip eeprom of an atmega128? I have some iar and gcc examples, but they don't work directly on CrossWorks (v2). Looking through the documentation I can't find any references an eeprom section. Do I need to go through the EE registers, or is there a more elegant way?

 

Thanks,

Ben

 

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  Paul Curtis

  • September 14, 2009 10:02

  __eeprom int x;

  x = 1;

  ++x;

  I think this is what you probably want.

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  Ben Stuyts

  • September 14, 2009 11:23

  Thanks Paul, that was exactly what I was looking for. I see it also takes care that any initialized data is put in the .eep file.

  I could not find this in the documentation anywhere. Is this an omission or am I just looking in the wrong place? Are there any other of these handy features?

  Ben

   

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  Paul Curtis

  • September 14, 2009 13:17

  It's not really documented at present, but will be when we get the next set of documentation out the door which is generated frlom our own format.

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  Ben Stuyts

  • September 14, 2009 14:03

  Cool, thanks!

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  Akos Buzogany

  • September 18, 2009 18:48

  I tried it for XMega, but it says "undefined symbol ___uint16_eeprom_store". Is it because XMega handles EEPROM quite differently than its predecessors, or is it because I am darn to stupid to understand some elementary features of the compiler?

  Are there EEPROM handling functions for XMega, or should I use the code found on Atmel's website?

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