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[GH-ISSUE #1092] Code is wrecking my ESP8266s? #932

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opened 2026-02-28 01:27:44 +03:00 by kerem · 5 comments

kerem commented

2026-02-28 01:27:44 +03:00

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Originally created by @ZebNZ on GitHub (Jul 8, 2020).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1092

Hi all,

I am running the Auto Connect code with some custom parameters.

For testing I include the " wifiManager.resetSettings();" line, but after about 20 times of powering on and setting up my credentials the ESP8266 will just reboot and reboot with error:

mounting FS...
mounted file system
reading config file
opened config file
{"mqtt_server":"","mqtt_port":"8080","blynk_token":"rt"}
parsed json

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

Exception (28):
epc1=0x4021e868 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffd60 end: 3fffffc0 offset: 0190
3ffffef0:  3fff09ec 3fffff4c 3ffeef90 4020144a  
3fffff00:  3fff09ec 3fffff4c 3ffeef90 4020224e  
3fffff10:  402199a0 00000000 000003e8 4020cbfc  
3fffff20:  3fff098c 3fff09d4 00000000 00000000  
3fffff30:  3ffef240 3ffeef90 00000038 3fff0a17  
3fffff40:  feefef0a feefeffe feefeffe 40219860  
3fffff50:  feefeffe 3fff0a2c 00000200 feefeffe  
3fffff60:  feefeffe feefeffe feefeffe feefeffe  
3fffff70:  feefeffe feefeffe feefeffe feefeffe  
3fffff80:  00000000 feefeffe feefeffe feefeffe  
3fffff90:  feefeffe feefeffe feefeffe 3ffef0c0  
3fffffa0:  3fffdad0 00000000 3ffef080 4020e97c  
3fffffb0:  feefeffe feefeffe 3ffe8530 40100dbd  
<<<stack<<<

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

 ets Jan  8 2013,rst cause:2, boot mode:(3,7)

load 0x4010f000, len 3664, room 16 
tail 0
chksum 0xee
csum 0xee
v39c79d9b
~ld

I then plug in another ESP8266 and the code works fine for about another 20 cycles, before doing the same thing!

I have tried clearing the EEPROM but no success in restoring my ESP8266s!

Any ideas on what's going wrong? I can provide all code if that's helpful? (it is just the Auto Connect code with some custom parameters and works great for around 20 cycles......)

Originally created by @ZebNZ on GitHub (Jul 8, 2020). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1092 Hi all, I am running the Auto Connect code with some custom parameters. For testing I include the " wifiManager.resetSettings();" line, **but after about 20 times of powering on and setting up my credentials the ESP8266 will just reboot and reboot with error**: ``` mounting FS... mounted file system reading config file opened config file {"mqtt_server":"","mqtt_port":"8080","blynk_token":"rt"} parsed json --------------- CUT HERE FOR EXCEPTION DECODER --------------- Exception (28): epc1=0x4021e868 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000 >>>stack>>> ctx: cont sp: 3ffffd60 end: 3fffffc0 offset: 0190 3ffffef0: 3fff09ec 3fffff4c 3ffeef90 4020144a 3fffff00: 3fff09ec 3fffff4c 3ffeef90 4020224e 3fffff10: 402199a0 00000000 000003e8 4020cbfc 3fffff20: 3fff098c 3fff09d4 00000000 00000000 3fffff30: 3ffef240 3ffeef90 00000038 3fff0a17 3fffff40: feefef0a feefeffe feefeffe 40219860 3fffff50: feefeffe 3fff0a2c 00000200 feefeffe 3fffff60: feefeffe feefeffe feefeffe feefeffe 3fffff70: feefeffe feefeffe feefeffe feefeffe 3fffff80: 00000000 feefeffe feefeffe feefeffe 3fffff90: feefeffe feefeffe feefeffe 3ffef0c0 3fffffa0: 3fffdad0 00000000 3ffef080 4020e97c 3fffffb0: feefeffe feefeffe 3ffe8530 40100dbd <<<stack<<< --------------- CUT HERE FOR EXCEPTION DECODER --------------- ets Jan 8 2013,rst cause:2, boot mode:(3,7) load 0x4010f000, len 3664, room 16 tail 0 chksum 0xee csum 0xee v39c79d9b ~ld ``` I then plug in another ESP8266 and the code **works fine for about another 20 cycles, before doing the same thing!** I have tried **clearing the EEPROM** but no success in restoring my ESP8266s! Any ideas on what's going wrong? I can provide all code if that's helpful? (it is just the Auto Connect code with some custom parameters and works great for around 20 cycles......)

kerem closed this issue

2026-02-28 01:27:44 +03:00

kerem commented

2026-02-28 01:27:45 +03:00

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Owner

@ZebNZ commented on GitHub (Jul 8, 2020):

The other interesting thing is that if I upload some new code (new parameters) it uploads to the board fine, but in the Serial Output it says
{"mqtt_server":"","mqtt_port":"8080","blynk_token"}

This is the output of some older code with my new code it should display:
{"datanow_username":"user23","datanow_password":"12345678"}

Would this indicate that the code is not uploading correctly? Or there is a problem with the EEPROM? If I upload the code to a brand new ESP8266 it displays what it should so code seems to be written correctly!

@ZebNZ commented on GitHub (Jul 8, 2020): The other interesting thing is that if I upload some new code (new parameters) it uploads to the board fine, but in the Serial Output it says `{"mqtt_server":"","mqtt_port":"8080","blynk_token"}` This is the output of some older code with my new code it should display: `{"datanow_username":"user23","datanow_password":"12345678"}` Would this indicate that the code is not uploading correctly? Or there is a problem with the EEPROM? If I upload the code to a brand new ESP8266 it displays what it should so code seems to be written correctly!

kerem commented

2026-02-28 01:27:45 +03:00

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Owner

@tablatronix commented on GitHub (Jul 8, 2020):

erase flash

@tablatronix commented on GitHub (Jul 8, 2020): erase flash

kerem commented

2026-02-28 01:27:45 +03:00

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Owner

@ZebNZ commented on GitHub (Jul 8, 2020):

Hi @tablatronix

I have flashed this code and then flashed my original code again and still no success!
https://github.com/kentaylor/EraseEsp8266Flash

Any other ideas?

@ZebNZ commented on GitHub (Jul 8, 2020): Hi @tablatronix I have flashed this code and then flashed my original code again and still no success! https://github.com/kentaylor/EraseEsp8266Flash Any other ideas?

kerem commented

2026-02-28 01:27:45 +03:00

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Owner

@ZebNZ commented on GitHub (Jul 8, 2020):

I have tried running a small but of code with a Serial.println and it works fine, I then upload my WiFiManager code and I get the same error (OP).

void setup() {
  Serial.begin(115200);
}

void loop() {
  Serial.println("test");
  delay(1000);
}

I have tried clearing the EEPROM again and the flashing my original code but still no success!

#include <EEPROM.h>

void setup() {
  Serial.begin(115200);
  EEPROM.begin(512);
  // write a 0 to all 512 bytes of the EEPROM
  for (int i = 0; i < 512; i++) {
    EEPROM.write(i, 0);
  }

  // turn the LED on when we're done
  pinMode(13, OUTPUT);
  digitalWrite(13, HIGH);
  EEPROM.end();
}

void loop() {
  Serial.println("done");
  delay(1000);
}

@ZebNZ commented on GitHub (Jul 8, 2020): I have tried running a small but of code with a Serial.println and it works fine, I then upload my WiFiManager code and I get the same error (OP). ``` void setup() { Serial.begin(115200); } void loop() { Serial.println("test"); delay(1000); } ``` I have tried clearing the EEPROM again and the flashing my original code but still no success! ``` #include <EEPROM.h> void setup() { Serial.begin(115200); EEPROM.begin(512); // write a 0 to all 512 bytes of the EEPROM for (int i = 0; i < 512; i++) { EEPROM.write(i, 0); } // turn the LED on when we're done pinMode(13, OUTPUT); digitalWrite(13, HIGH); EEPROM.end(); } void loop() { Serial.println("done"); delay(1000); } ```

kerem commented

2026-02-28 01:27:45 +03:00

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Owner

@ZebNZ commented on GitHub (Jul 9, 2020):

Fixed!

Go to your Arduino IDE then Tools > Flash > Erase Flash and tick the checkbox that says "All Flash Contents" and flash the code.

Once the code has finished flashing you can set this option back to "Only Sketch".

Thanks,

Zeb

@ZebNZ commented on GitHub (Jul 9, 2020): Fixed! Go to your Arduino IDE then Tools > Flash > Erase Flash and tick the checkbox that says "All Flash Contents" and flash the code. ![ESP8266 Erase All Flash Contents](https://user-images.githubusercontent.com/51018316/86983450-07727c80-c1e0-11ea-9e51-070870222d15.jpg) Once the code has finished flashing you can set this option back to "Only Sketch". Thanks, Zeb