Re: [avr-chat] ?Optimized eeprom?

[Bob Paddock]

> The only reliable, repeatable and maintainable (i.e., without manually
> specifying each address) way to get consistent addresses is to put all  
> your eeprom data into a single struct.  It's best to make sure that any  
> padding involved is explicit (using the "-wpadded" warning).

Use offsetof() in stddef.h:

"Almost never used, the offsetof() macro can actually be a helpful  
addition to your bag of tricks.
Here are a couple of places in embedded systems where the macro is  
indispensable?packing data
structures and describing how EEPROM data are stored."

see

"Learn a new trick with the offsetof() macro":
http://www.embedded.com/showArticle.jhtml?articleID=18312031

and

"Data formats change over time. To make upgrades easier,
track these changes with version numbers.":
http://www.embedded.com/shared/printableArticle.jhtml?articleID=9900199