Does the newest datapoint *have* to be in location 10? If not, then you
could just keep an index that pointed to the current memory location, and
have it wrap back to 0. something like:

        index = 0;
        while (recording)
        {
                WriteMemory(index, measurement)
                (index^9)?index++:index=0;              //increment index,
but wrap to zero if index==9
        }


        where WriteMemory() is whatever function you use to store your data
that specifies address and measurement to store. I guess you get the idea.
You can re-read the data newest to oldest just by knowing the value of
<index>, since that was the last address you stored. when re-reading, you
would just have to decrement the index, and wrap from 0 to 9. Same
principle, though.

hope that makes sense

> -----Original Message-----
> From: Mccauley, Daniel H [mailto:daniel.h.mccauley@LMCO.COM]
> Sent: Friday, May 16, 2003 10:22 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: Storing 10 Sets of Data to EEPROM and performing
> revolving updates ? ? ?
>
>
> For my project I wish to do the following:
>
> For each measurement I take with this electronic timing device (my PIC
> controlled device), I want to store the result as following:
>
> Measurement 1 - Result 1
>
> For the next measurement, the data would be stored in:
>
> Measurement 2 - Result 2
>
> This would go so on until 10 Results are stored.  Since I am
> only storing 10
> results, for the 11th measurement, I want to discard the oldest
> datapoint and store the new datapoint at location Result 10.
>
> So basically I'm only storing the last 10 Results and always
> dropping the
> oldest to allow room for the newest result.
>
> My question is, what is the best way to code this??? (I'm using CCS C
> compiler)  Do I move actual data through EEPROM everytime
> the 11th, 12th, so on results are being stored, or is it
> better to change
> the actual EEPROM storage address.
>
> Any help appreciated!!!
>
> D
>
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>

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