ESP8266 Community Forum

- Mon Nov 11, 2019 4:19 am #84510 Hi, I'm trying to break the eeprom of an esp8266 to do some tests, but after more than a million writings it still works. I do not understand the technical sheet of the eeprom is 100,000 writings.

- Mon Nov 11, 2019 5:13 am #84512 The 100,000 number applies to program erase cycles. This is not the same as writes. In the erased state bits are '1'. When you write from an erased state it just changes those '1' to '0' that it needs to. Bits can only be set from '0' back to '1' by erasing the whole block of cells. So when you write into a previous written location then that may or may not trigger an erase cycle depending on the actual data content. If you write into different locations then that can lower the occurence of an erase happening. So, for example, you could write all 4MB of an erased 4MB chip without causing a single erase.

If you test on a single location then you can force a high erase rate by alternating '1' and '0'writes.

Even with this you may get considerably more than 100,000 erases as that is normally regarded as a conservative minimum number which is also taking into account other factors like the operating temperature of the chip.

- Mon Nov 11, 2019 5:49 am #84513 Thank you for your response, this is my code

Code: Select allvoid loop()
{
EEPROM.write(10, 1);
EEPROM.commit();
      
EEPROM.write(10, 0);
EEPROM.commit();
}