saving struct values in eeprom

[soundscu]

Hi all.

I need to backup values in a complex struct to/from eeprom. The easiest way, I think, would be to access the individual bytes of the struct like the elements of an array. The struct uses a total of 43 bytes, consisting of various int8s, int32s, and 32-bit floats.

Are the bytes of a struct kept contiguous by the compiler?

Is there an easy way to do this in c?

Thanks for your help and/or suggestions.

Sincerely,
Jim

[PCM programmer]

See this post, regarding a union between an array and other structure
elements.
http://www.ccsinfo.com/forum/viewtopic.php?t=18729

That method depends upon CCS packing all structure elements on a
1-byte boundary, with no padding. I believe they do that.

The reason for the delay in answering was that I kept searching the
archives for an old post, where I state that. I couldn't find it, so I
just finally re-stated it above.

[soundscu]

Your suggestion has led to a working routine! The syntax for using a struct in a union isn't quite what I thought it was.

Incidentally, my application is a touch more complicated because I use a 7-element array of the struct I defined. Evenso, success!

Thanks very much.

But now I have a new problem... see my new subject "write_eeprom not working with PIC18F6722". :(

[Pret]

Personally i have similar question. Is there any way to declare a data structure directly in EEPROM using #rom directive? Something like: