ESP8266 Community Forum

Hi,

I have a project running on generic esp8266 module.
In that module, each time I lose connectivity to wifi network I save my data in EEPROM and once connectivity is back, I send that data to gateway and hence EEPROM read and writes are quite frequent in my ESP due to frequent reconnects to the wifi network.

Now after some time of use, my EEPROM write has failed.
I am encountering the following error:



Please tell what this Exception decode status means.
I erased all the flash content, still, my EEPROM is not working on the freshly programmed board.

I have answered this question almost exactly the same within the last week...

The watchdog gets active when the "SDK base code" hasn't been called for some time. This code handles Wifi and a few other low-level stuff. It can't work if it doesn't get called timely. Also the watchdog prevents the Wifi from being jabbered when some user code crashes.

The stack, that you supplied, does not give any useful information in this case.

Here is the thing: you can't call the SDK base code directly. This is code that is started automatically at boot and then it calls your code. So the only way to make it run, is to return to that code. In practice this means you should only run small parts of code and use timers and events to run them.

A program consisting of "for(;;) do_someting();" will not work and the watchdog will intervene.

Of course this all about programming the native SDK, it's not about arduino. I assumed native SDK as you did not specify what SDK you're using.

Looks like we have the same issue. But I was able to fix it.

I also have watch dog timer WDT, Exception errors (1) (28) (9). You name it all crashes are there.
So I tried to a different board, it never crashes. So the issue is not software but hardware.
I can see you are using generic ESP8266 which is the same as mine.
I compared my two boards and the difference is the electrolytic capacitor that I installed for the 3.3VDC power supply of the ESP8266. That solved my problem.

Also the more program you have the more energy it requires so it seems. When I install basic blinker it does not crash. But when I installed the 47uF capacitor, my big program 679 lines is not crashing anymore.

For your case try buying a kit first like WEMOS D1. So that you don't have to deal with the power supply.
How did you power up your ESP8266?