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Posted: **19 Nov 2021 13:57**

Hi,

using Z-Uno2 3.0.7, I have simple program that writes data to EEPROM, then reads out then compare it to verify if the write operation was successfull.

I use mainly read and write bulk operations, like put and get. I can confirm that the data has been written correctly to the EEPROM. the only issue is that the put and get functions always return 0, which results to false checks in my code. This behaviour is NOT compatible with Z-Uno first GEN.

Here's a code snippet:

Code: Select all

if (EEPROM.put(addr, &write_array, asize))
    Serial.println("Flashing success");
  else {
    Serial.println("Flashing failed");
  }

....

  if (EEPROM.get(addr, &read_array, asize*usize))
    Serial.println("EEPROM Read: success");
  else {
    Serial.println("EEPROM Read: failure");
    return;
  }

Same behaviour in 3.0.8beta

Posted: **19 Nov 2021 19:36**

An example looks like this, but is equal to the V1.

Code: Select all

    Serial.println("Reading buffer from EEPROM...");
    res = EEPROM.get(addr, &read_data, sizeof(read_data));
    Serial.print("Read ");
    Serial.print(res);
    Serial.println(" Bytes");

    // write data to a specific address
    res = EEPROM.put(addr, &some_data, sizeof(some_data));

Posted: **21 Nov 2021 15:01**

Hi joergm6,

what is the output of the code snippet above?

In my case it is:

Code: Select all

13:04:57.218 -> Reading 128 Bytes one by one from EEPROM...
13:04:57.218 -> AA BB CC DD EE FF FF FF FF FF FF FF FF FF FF FF FF
13:04:57.218 -> FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 3C
13:04:57.251 -> 0 64 0 0 55 0 0 55 0 0 0 0 55 0 0 55
13:04:57.251 -> 55 0 0 55 0 0 0 0 55 0 0 55 55 0 0 55
13:04:57.251 -> 0 0 0 0 55 0 0 55 55 0 0 55 0 0 0 0
13:04:57.251 -> 55 0 0 55 55 0 0 55 0 0 0 0 55 0 0 55
13:04:57.251 -> 55 0 0 55 0 0 0 0 55 0 0 55 55 0 0 0
13:04:57.251 -> 0 0 55 0 0 0 0 0 55 0 0 0 0 0 0 
13:04:57.251 -> Reading buffer from EEPROM...
13:04:57.285 -> Read 0 Bytes

compared to Zuno 1G, the results look lie this:

Code: Select all

13:11:53.740 -> Reading 128 Bytes one by one from EEPROM...
13:11:53.740 -> AA BB CC DD EE 55 11 26 55 12 25 54 13 24 54 14 23
13:11:53.740 -> 53 15 22 52 16 21 52 17 20 51 17 1F 51 18 1E 3C
13:11:53.778 -> 0 64 0 0 55 0 0 55 0 0 0 0 55 0 0 55
13:11:53.778 -> 55 0 0 55 0 0 0 0 55 0 0 55 55 0 0 55
13:11:53.815 -> 0 0 0 0 55 0 0 55 55 0 0 55 0 0 0 0
13:11:53.815 -> 55 0 0 55 55 0 0 55 0 0 0 0 55 0 0 55
13:11:53.815 -> 55 0 0 55 0 0 0 0 55 0 0 55 55 0 0 0
13:11:53.851 -> 0 0 55 0 0 0 0 0 55 0 0 0 0 0 0 
13:11:53.851 -> Reading buffer from EEPROM...
13:11:53.851 -> Read 1 Bytes

It seems that the function return 1 instead of 0. what does this `1` mean is something that the creators should be able to answer

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EEPROM functions always return 0

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