How to define constants that specify eeprom addresses

[Darrel Taylor]

EEPROM allocation only increments.

And whether you're counting from end up or top down, you still need to know where the original program's highest EEPROM location is, and how many bytes you need now.

Going from end-up will make it longer before you overwrite locations, but it won't keep you from doing it.
If you start from the end of previous eeprom usage and add more as needed, then the compiler will let you know when you've run out.

But anyhow, if you know how many bytes you are adding(EEusedNow), and you know how many bytes are available ...

MaxEEPROM    CON 255
EEusedNow    CON 65

DATA  @MaxEEPROM - EEusedNow + 1

ee_patnum    DATA 2
ee_stepnum   DATA 0
ee_bright    DATA 255
ee_xfade     DATA 254

;... etc. ...

[DwayneR]

I think that will work quite nicely.

I know how many system variables that I have (not many) and I will certainly keep track of the user variables.

This does exactly what I want: provides me with a single place where I can specify the eeprom size.

Many thanks!

dwayne