[En-Nut-Discussion] Non-Volatile user data

[Kowalsky, Richard]

 Hello,

I have a custom ATMEGA-128 board I am using with 64K of external battery backed up RAM attached and Ethernut 3.9.8.

In my application I have a lot of variables that hold user data. For example, in my main source file I declare global space for user specified analog alarm limits and messages as shown:

#include "stuff"
/* Declare an analog limit structure for each of the posible analog channels */
ANALOG_MONITOR aMon[MAX_ANALOG_ALARMS];
/* Declare a digital monitor structure for each possible digital monitor bits */
DIGITAL_MONITOR dMon[MAX_DIGITAL_ALARMS];
/* Storage for canned messages */
char message[MAX_MSGS][MAX_MSG_LEN];
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My question is, how can I set things up so that if my application is restarted, the global variables retain any values that were previously stored in them?  I guess, on thinking about it more, if they are stored in the battery backed up external RAM, they are automatically non-volatile. (unless you change the battery).
Does that sound correct?   Obviously I need to make sure that those variables are stored off-chip in the backed-up external RAM.  How do I do that?
Any thought would be appreciated.  I Love Ethernut, it's really cool!.
Richard


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