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Forum Index : Microcontroller and PC projects : var eeprom saving when reprogramming

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lizby
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Joined: 17/05/2016
Location: United States
Posts: 3464
Posted: 03:53am 06 Mar 2017
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Is there a way to preserve the contents of the eeprom (VAR saved variables) when downloading a new program?

The manual says "saved variables will be automatically cleared by the NEW command or when a new program is loaded."

I often just want to make a small change in a program while preserving variable values saved in eeprom. Is there a way to do this?
PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed
 
jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711
Posted: 08:22am 06 Mar 2017
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Hi

Why not use the built in editor to make the small changes that way all VAR save variables will be intact

Regards
Jman
 
CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2171
Posted: 08:36am 06 Mar 2017
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bit more involved but it is easy to add a EEPROM or FRAM chip and then store your variables in that - safe from everything then.
 
lizby
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Joined: 17/05/2016
Location: United States
Posts: 3464
Posted: 08:46am 06 Mar 2017
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Yes, I have eeprom on a ds3132 module, and can use that, but would have to write the functional equivalent of var save and var restore.
PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed
 
CaptainBoing

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Posted: 10:03am 06 Mar 2017
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does this help?

http://www.thebackshed.com/forum/forum_posts.asp?TID=6917
Edited by CaptainBoing 2017-03-07
 
lizby
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Joined: 17/05/2016
Location: United States
Posts: 3464
Posted: 11:53am 06 Mar 2017
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Yes, I saw and noted that nice library. I was hoping for something like the PICAXE directive, "#no_data", which causes eeprom to be preserved when the program is re-flashed. Something like

OPTION SAVE EEPROM

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