More than one EEPROM instance

Using Arduino Programming Questions
1

Hi all.
I am using Arduino IDE and ESP32.
Is it possible to define more than one EEPROM instances.

Like:
#define dogs EEPROM_1
#define cats EEPROM_2

dogs.begin(EEPROM_SIZE);
cats.begin(EEPROM_SIZE);

dogs.writeByte(location,breed);
cats.writeByte(location,breed);

so that i can independent storage.

Regards

2

EEPROM emulation is deprecated on the ESP32.
Use Preferences instead.

https://espressif-docs.readthedocs-hosted.com/projects/arduino-esp32/en/latest/api/preferences.html

3

Hi

Thank you for the info.
However I am now half way in my programming.
I prefer to continue with EEPROM.

Any idea about my question?
Regards

4

What happened when you tried?

Remember EEPROM on the ESP32 has been deprecated. It has been deprecated for 2 ESP32 core updates. You may find that the API may be now incompatible with EEPROM at some point, and you may run into issues.

5

yes, but as you are just half the way through, I would recommend that you use preferences and not flogging a dead horse.

6

Hi.
I had a go at the documentation, and some examples.
I found them a little confusing.
For example, take look at the code below.
It is very simple and easy to understand.

#EEPROM_SIZE 20
EEPROM.begin(EEPROM_SIZE);
void save_mydata()
{
   
  for (int address = 0; address < 12; address++)
  {
      EEPROM.writeByte(address, someData );
   }
}

I was not able to convert it to 'Preferences'.
Maybe because the terminology does not reflect the task.
But, definitely, i lack the experience in C++.
I do accept any help though.

Regards

7

all your lines above are needed to do a simple

  #include <Preferences.h>
  preferences.begin("my-app", false);
  preferences.putUInt("meaningfulVariableName", someData);

the example "Preferences / StartCounter" in the IDE is a very short example how to "write" (put) and "read" (get) a variable from your preference storage.

You should really give it a try.

if you want to provide a short compileable example with meaningful variable names, one could give you an example with preferences.

But honestly - I don't think you will need that - start with the example "Preferences / StartCounter" and the documentation and you will get lucky.

8

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