Ok. What about input selector switch itawlf, does it contains sections, related to this processor? Can it rotate 360 degrees, or just 270 , and change direction?
Why. not stored in EEPROM. When changed it goes look first. When turned on it goes look. Unless you change it manually. Then you need feedback on every thing controlled by hand.
Write every movement to eeprom is a good memory killer. Proper software writes last state when doing power off.
Good lord is EEProm that fragile these days. Bummer. How many R/W cycles kills EEPROM in reality. I cannot remember that R/W killed any EEPROM in 20 odd years making several million products. I think the EEPROM will outlast this product. Even the relays has limited life, The switches and potentiometer also. For integrity you can save the settinbgs in two or more address locations, Never the less, nothing lives forever.
At work we had several problems,.related to eeprom failure. 1. Automotive air conditioner controllers , several pieces, after year or two usage, failed to remember temperature set. Had no external eeprom, no standby voltage, no battery, no voltage on electrolytic capacitors left while turning off, tested good unit too. Only one , who stores settings, is processor with internal eeprom, datasheet says 1000 rw cycles. 2. Old soldering station with m24c01 chip, after replacement memory functionality restored. So eeprom is over- trusted i would say, by saving few cents on external memory chip, they make device useless while eeprom fails.
My watch becomes useless when the battery fails. So what will you suggest would never fail. Papyrus scroll written on with goose quill?
I'm saying that choice of using internal eeprom is not good, if that eeprom is rewritten too frequently. But nobody cares how long their creation will be usable or work properly and i don't like such choice.