Need help with variable space

clloyd

I am using one of the STAMP microcontrollers however the program I am putting on it seems to need a lot of variable space, well it would be a lot more convenient than attempting to consistently use temporary variables. I was wondering if there was an easy way to either have an external memory with easy access to these variables or a way to access more variables through another method or something. The model we have is a B2SE. Any help for this would be greatly appreciated.

SRLM

Have you used the Scratch Pad RAM? The BS2e has 63 bytes available. You can't add any external RAM, but you can add external EEPROM. Also, have you considered using the onboard EEPROM?

clloyd

I had thought the EEPROM was only usable for constants and the program itself, maybe I misunderstood, where and how would I declared a variable in EEPROM?

Mike Green

The EEPROM can be used for storing variable data using the READ and WRITE statements. You can't declare a variable in EEPROM. It's treated differently. Also, there's a limit on the number of times the value can be changed. It's around 100,000 times. After that, the location starts to wear out and can't be rewritten.

Best is to use the scratchpad RAM unless you want the values to "survive" a power failure.

SRLM

You don't use the EEPROM for variables. That is the exclusive domain of RAM. The EEPROM is useful for reading and writing long term data. See the READ and WRITE command in the Basic Stamp Reference and Syntax Manual, availble for free download from Parallax.

Edit: Why, oh why do I take so long to post? Mike beat me... Until we meet again, good sir!

Post Edited (SRLM) : 10/23/2008 3:32:44 AM GMT