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[GH-ISSUE #184] Strange error when booting. #145

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opened 2026-02-28 01:23:41 +03:00 by kerem · 10 comments
kerem commented 2026-02-28 01:23:41 +03:00
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Originally created by @dnnagy on GitHub (Jun 20, 2016).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/184

When I try to boot my device I get an exception before WM connects. Yesterday it worked well, however today I can not boot up my device. I made sure, the device gets enough power. I'm sure , the wiring is correct because WiFiScan example works. I wish to know how to debug exceptions like this. This is the output to the serial:

*WM: settings invalidated
*WM: THIS MAY CAUSE AP NOT TO START UP PROPERLY. YOU NEED TO COMMENT IT OUT AFTER ERASING THE DATA.
*WM: 
*WM: AutoConnect
*WM: Connecting as wifi client...
*WM: Using last saved values, should be faster
*WM: Connection result: 
*WM: 0

Exception (29):
epc1=0x4000e1c3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000018 depc=0x00000000

ctx: cont 
sp: 3fff07c0 end: 3fff0c30 offset: 01a0

>>>stack>>>
3fff0960:  3fff23b8 00000001 0000000d ffffff80  
3fff0970:  40236f9e 4021fad8 00000018 3fff1e88  
3fff0980:  00000001 3fff2350 3fff2350 40237184  
3fff0990:  3fff2350 3fff1e88 3ffefac3 00000000  
3fff09a0:  3ffef004 3ffeeea8 1271094c 3ffefac3  
3fff09b0:  40243308 00000064 f934fe1a fffeffff  
3fff09c0:  00000018 0000ffff 00000000 00000001  
3fff09d0:  3fff09e8 40233740 3ffeed94 3fff1e88  
3fff09e0:  f934fe1a 3fff5e2b 00000000 00000000  
3fff09f0:  00000000 00000000 00000000 00000000  
3fff0a00:  00000000 00000000 00000000 00000000  
3fff0a10:  00000000 00000000 40234437 3fff1e88  
3fff0a20:  3ffefac3 3fff1e88 3fff1e88 4023447f  
3fff0a30:  0000000c 3ffeeea8 3ffe9cbc 00000000  
3fff0a40:  40218909 00000003 00000003 3ffefac3  
3fff0a50:  40218a21 00000003 00000003 4020ca69  
3fff0a60:  00000001 40218a7a 00000003 3ffefac3  
3fff0a70:  40206cb0 3ffefac3 3ffe86e3 3ffefac3  
3fff0a80:  40206cde 3ffe86e3 3ffefac3 40206d04  
3fff0a90:  00000003 00000000 3fff0b30 4020ad11  
3fff0aa0:  3fff1ec8 0000000f 3fff0b30 4020b9c7  
3fff0ab0:  40206cc0 3ffefac3 3fff0af0 4020e6ae  
3fff0ac0:  40107158 3fff0b30 3fff0af0 4020e6fc  
3fff0ad0:  3ffe9001 4024229d 3fff0c80 00000000  
3fff0ae0:  00000000 3ffe86e3 3fff0b30 4020bb49  
3fff0af0:  3fff1ea8 0000000f 00000000 3fff1e88  
3fff0b00:  0000000f 00000000 3fff0c80 4020a3fe  
3fff0b10:  0001c200 3fff0c80 3fff0b30 3ffefc04  
3fff0b20:  3fffdc20 3fff0c80 3ffe86e3 40206998  
3fff0b30:  00000000 00000000 3ffe8ea4 00000000  
3fff0b40:  3fff1e48 0000000f 00000000 3fff1e68  
3fff0b50:  0000000f 00000000 00000000 00000000  
3fff0b60:  00000000 3ffe92c0 00000000 3ffe92c0  
3fff0b70:  00000000 3ffe92c0 00000000 3ffe92c0  
3fff0b80:  00000000 3ffe92c0 00000000 3ffe92c0  
3fff0b90:  00000000 00000000 ffffffff 00000001  
3fff0ba0:  3ffe9001 00000000 00010035 402068f4  
3fff0bb0:  00000000 00000000 00000000 00000000  
3fff0bc0:  00000000 00000000 00000000 00000000  
3fff0bd0:  00000000 00000000 00000000 00000000  
3fff0be0:  00000000 00000000 00000000 00000000  
3fff0bf0:  00000000 00000000 00000000 00000000  
3fff0c00:  00000000 00000000 00000000 00000000  
3fff0c10:  00000000 00000000 3ffefbfc 4020c096  
3fff0c20:  00000000 00000000 3ffefc10 40100114  
<<<stack<<<

 ets Jan  8 2013,rst cause:2, boot mode:(1,3)
Originally created by @dnnagy on GitHub (Jun 20, 2016). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/184 When I try to boot my device I get an exception before WM connects. Yesterday it worked well, however today I can not boot up my device. I made sure, the device gets enough power. I'm sure , the wiring is correct because WiFiScan example works. I wish to know how to debug exceptions like this. This is the output to the serial: ``` *WM: settings invalidated *WM: THIS MAY CAUSE AP NOT TO START UP PROPERLY. YOU NEED TO COMMENT IT OUT AFTER ERASING THE DATA. *WM: *WM: AutoConnect *WM: Connecting as wifi client... *WM: Using last saved values, should be faster *WM: Connection result: *WM: 0 Exception (29): epc1=0x4000e1c3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000018 depc=0x00000000 ctx: cont sp: 3fff07c0 end: 3fff0c30 offset: 01a0 >>>stack>>> 3fff0960: 3fff23b8 00000001 0000000d ffffff80 3fff0970: 40236f9e 4021fad8 00000018 3fff1e88 3fff0980: 00000001 3fff2350 3fff2350 40237184 3fff0990: 3fff2350 3fff1e88 3ffefac3 00000000 3fff09a0: 3ffef004 3ffeeea8 1271094c 3ffefac3 3fff09b0: 40243308 00000064 f934fe1a fffeffff 3fff09c0: 00000018 0000ffff 00000000 00000001 3fff09d0: 3fff09e8 40233740 3ffeed94 3fff1e88 3fff09e0: f934fe1a 3fff5e2b 00000000 00000000 3fff09f0: 00000000 00000000 00000000 00000000 3fff0a00: 00000000 00000000 00000000 00000000 3fff0a10: 00000000 00000000 40234437 3fff1e88 3fff0a20: 3ffefac3 3fff1e88 3fff1e88 4023447f 3fff0a30: 0000000c 3ffeeea8 3ffe9cbc 00000000 3fff0a40: 40218909 00000003 00000003 3ffefac3 3fff0a50: 40218a21 00000003 00000003 4020ca69 3fff0a60: 00000001 40218a7a 00000003 3ffefac3 3fff0a70: 40206cb0 3ffefac3 3ffe86e3 3ffefac3 3fff0a80: 40206cde 3ffe86e3 3ffefac3 40206d04 3fff0a90: 00000003 00000000 3fff0b30 4020ad11 3fff0aa0: 3fff1ec8 0000000f 3fff0b30 4020b9c7 3fff0ab0: 40206cc0 3ffefac3 3fff0af0 4020e6ae 3fff0ac0: 40107158 3fff0b30 3fff0af0 4020e6fc 3fff0ad0: 3ffe9001 4024229d 3fff0c80 00000000 3fff0ae0: 00000000 3ffe86e3 3fff0b30 4020bb49 3fff0af0: 3fff1ea8 0000000f 00000000 3fff1e88 3fff0b00: 0000000f 00000000 3fff0c80 4020a3fe 3fff0b10: 0001c200 3fff0c80 3fff0b30 3ffefc04 3fff0b20: 3fffdc20 3fff0c80 3ffe86e3 40206998 3fff0b30: 00000000 00000000 3ffe8ea4 00000000 3fff0b40: 3fff1e48 0000000f 00000000 3fff1e68 3fff0b50: 0000000f 00000000 00000000 00000000 3fff0b60: 00000000 3ffe92c0 00000000 3ffe92c0 3fff0b70: 00000000 3ffe92c0 00000000 3ffe92c0 3fff0b80: 00000000 3ffe92c0 00000000 3ffe92c0 3fff0b90: 00000000 00000000 ffffffff 00000001 3fff0ba0: 3ffe9001 00000000 00010035 402068f4 3fff0bb0: 00000000 00000000 00000000 00000000 3fff0bc0: 00000000 00000000 00000000 00000000 3fff0bd0: 00000000 00000000 00000000 00000000 3fff0be0: 00000000 00000000 00000000 00000000 3fff0bf0: 00000000 00000000 00000000 00000000 3fff0c00: 00000000 00000000 00000000 00000000 3fff0c10: 00000000 00000000 3ffefbfc 4020c096 3fff0c20: 00000000 00000000 3ffefc10 40100114 <<<stack<<< ets Jan 8 2013,rst cause:2, boot mode:(1,3) ```
kerem closed this issue 2026-02-28 01:23:41 +03:00
kerem commented 2026-02-28 01:23:41 +03:00
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@dnnagy commented on GitHub (Jun 20, 2016):

Here is my setup code:

//Main setup
void setup() {
  // put your setup code here, to run once:
  Serial.begin(BAUD_RATE);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  DEBUGLN("Trying to connect to WiFi...");
  WiFiManager wifiManager;

  wifiManager.resetSettings();


  //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
  wifiManager.setAPCallback(configModeCallback);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect(UUID)) {
    DEBUGLN("failed to connect and hit timeout");
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(1000);
  }

  //if you get here you have connected to the WiFi
  DEBUGLN("Connected to WiFi");


  return;
}
<!-- gh-comment-id:227209533 --> @dnnagy commented on GitHub (Jun 20, 2016): Here is my setup code: ``` //Main setup void setup() { // put your setup code here, to run once: Serial.begin(BAUD_RATE); //WiFiManager //Local intialization. Once its business is done, there is no need to keep it around DEBUGLN("Trying to connect to WiFi..."); WiFiManager wifiManager; wifiManager.resetSettings(); //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode wifiManager.setAPCallback(configModeCallback); //fetches ssid and pass and tries to connect //if it does not connect it starts an access point with the specified name //here "AutoConnectAP" //and goes into a blocking loop awaiting configuration if (!wifiManager.autoConnect(UUID)) { DEBUGLN("failed to connect and hit timeout"); //reset and try again, or maybe put it to deep sleep ESP.reset(); delay(1000); } //if you get here you have connected to the WiFi DEBUGLN("Connected to WiFi"); return; } ```
kerem commented 2026-02-28 01:23:41 +03:00
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@tueddy commented on GitHub (Jun 21, 2016):

Hello,

same here on booting:

Exception (29):
epc1=0x4000e1b2 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

ctx: cont
sp: 3fff0bc0 end: 3fff0ff0 offset: 01a0

I'm sure this was working before. Tried version 0.11.0 & 0.12.0.
Tried also format the filesystem.

Best regards
Dirk

<!-- gh-comment-id:227382640 --> @tueddy commented on GitHub (Jun 21, 2016): Hello, same here on booting: Exception (29): epc1=0x4000e1b2 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000 ctx: cont sp: 3fff0bc0 end: 3fff0ff0 offset: 01a0 I'm sure this was working before. Tried version 0.11.0 & 0.12.0. Tried also format the filesystem. Best regards Dirk
kerem commented 2026-02-28 01:23:41 +03:00
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@dnnagy commented on GitHub (Jun 21, 2016):

The AutoConnect example also crashes with the same exception. I found that the code possibly crashes at this line.

<!-- gh-comment-id:227468140 --> @dnnagy commented on GitHub (Jun 21, 2016): The AutoConnect example also crashes with the same exception. I found that the code possibly crashes at [this line](https://github.com/tzapu/WiFiManager/blob/master/WiFiManager.cpp#L247).
kerem commented 2026-02-28 01:23:41 +03:00
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@tzapu commented on GitHub (Jun 21, 2016):

hi, could you confirm what esp8266 core lib you are using and what arduino ide?
also, did you set the flash size to the proper size in arduino ide?

<!-- gh-comment-id:227473928 --> @tzapu commented on GitHub (Jun 21, 2016): hi, could you confirm what esp8266 core lib you are using and what arduino ide? also, did you set the flash size to the proper size in arduino ide?
kerem commented 2026-02-28 01:23:41 +03:00
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@dnnagy commented on GitHub (Jun 21, 2016):

Hi! I think I use version 1.0.0 of the esp8266 library. I install the compiled binary using esptool.py in Terminal.

<!-- gh-comment-id:227496211 --> @dnnagy commented on GitHub (Jun 21, 2016): Hi! I think I use version 1.0.0 of the esp8266 library. I install the compiled binary using esptool.py in Terminal.
kerem commented 2026-02-28 01:23:41 +03:00
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@tzapu commented on GitHub (Jun 23, 2016):

hi, try and update to the latest esp8266 core please
https://github.com/esp8266/Arduino#installing-with-boards-manager

or at least to 2.2.0

cheers

<!-- gh-comment-id:228166549 --> @tzapu commented on GitHub (Jun 23, 2016): hi, try and update to the latest esp8266 core please https://github.com/esp8266/Arduino#installing-with-boards-manager or at least to 2.2.0 cheers
kerem commented 2026-02-28 01:23:41 +03:00
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@tueddy commented on GitHub (Jun 24, 2016):

Hello, same problem after updating.

Ardunio IDE 1.6.9
ESP8266 package: 2.3.0
Wifi-Manager:0.12.0

tested with different new boards: Witty Cloud, Wimos.

<!-- gh-comment-id:228284860 --> @tueddy commented on GitHub (Jun 24, 2016): Hello, same problem after updating. Ardunio IDE 1.6.9 ESP8266 package: 2.3.0 Wifi-Manager:0.12.0 tested with different new boards: Witty Cloud, Wimos.
kerem commented 2026-02-28 01:23:41 +03:00
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@tzapu commented on GitHub (Jun 25, 2016):

hi, thanks for letting me know.
i did not test with 2.3.0 myself yet. does this happen on a simple AutoConnect example?
i'm quite swamped currently, but hope to get a bit more time next week and hopefully attend to this
sorry for any inconvenience

<!-- gh-comment-id:228528043 --> @tzapu commented on GitHub (Jun 25, 2016): hi, thanks for letting me know. i did not test with 2.3.0 myself yet. does this happen on a simple AutoConnect example? i'm quite swamped currently, but hope to get a bit more time next week and hopefully attend to this sorry for any inconvenience
kerem commented 2026-02-28 01:23:41 +03:00
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@dnnagy commented on GitHub (Jun 25, 2016):

Yes, it happens with AutoConnect example. But on my chip the WiFiScan example works, so the wiring and power supply has to be correct.

<!-- gh-comment-id:228544944 --> @dnnagy commented on GitHub (Jun 25, 2016): Yes, it happens with AutoConnect example. But on my chip the WiFiScan example works, so the wiring and power supply has to be correct.
kerem commented 2026-02-28 01:23:41 +03:00
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@kentaylor commented on GitHub (Jun 30, 2016):

You could have corrupted flash. Try erasing the flash with this sketch https://github.com/kentaylor/EraseEsp8266Flash .

<!-- gh-comment-id:229544295 --> @kentaylor commented on GitHub (Jun 30, 2016): You could have corrupted flash. Try erasing the flash with this sketch https://github.com/kentaylor/EraseEsp8266Flash .
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