Arduino: Dictionaries extending in EEPROM

[mitra42]

Idea is to have dictionaries extend in EEPROM rather than RAM -

• JS: extend the Mem classes to have an EEPROM reserved write area
• C: extend code that decides ROM v RAM to have EEPROM area as well
• Use EEPROM.build(xx) to reserve some of that area
• Instead of switching pointers to Ram, switch to EEPROM on startup -
• Allow switching pointers dynamically, so can test in Ram, then go back to EEPROM and write, then test more in RAM
• Figure out how to know have EEPROM initialized
• Make sure to test with EEPROMSIZE 0 or undefined e.g. for Arduino

See

• one of the comments on https://www.facebook.com/groups/FORTHarduino/permalink/803501973853713/
• https://diyprojects.io/esp8266-how-read-write-erase-the-eeprom-calculate-space-needed
• https://arduino-esp8266.readthedocs.io/en/latest/libraries.html#eeprom
• ??? for Arduino which is different from ESP8266

[mitra42]

• Think through design - issues ...
  • Phase 1: Writing to ROM, variables in RAM
  • Phase 2: Writing to EEPROM, variables in RAM
    • independent of whether EEPROM has been committed or not.
  • Phase 3:
    • Operating after booting with EEPROM

[mitra42]

JS build - on separate branch

• Add extra memory Eeprom - like Ram and Rom
• Extend Mem class to check it
• define useEprom, like useRam