CODEWITHSUNDEEP
iotesp32arduino-esp32
Rania Choura
Rania Choura

Reputation: 1

Error: Core 0 panic'ed (LoadProhibited). Esp32 arduino IDE

I tried to get data from the database mysql using http protocol in esp32 using arduino IDE there is no error but the monitor show this behavior This is the error i had when i run the serial monitor:

Core  0 register dump:

PC      : 0x4014fd01  PS      : 0x00060030  A0      : 0x80005fdd  A1      : 0x3ffcaa60  

A2      : 0x3ffcaa92  A3      : 0x3ffcaa90  A4      : 0x00000000  A5      : 0x00001ffe  

A6      : 0x00000000  A7      : 0x3ffc8d37  A8      : 0x00001ffe  A9      : 0x00000fff  

A10     : 0x3ffcaa70  A11     : 0x00006bf5  A12     : 0x00000fff  A13     : 0x00000fff

A14     : 0x24221f1c  A15     : 0x2e2c2927  SAR     : 0x00000000  EXCCAUSE: 0x0000001c  

EXCVADDR: 0x80005fe1  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0x00000000   ``

this is the code :

//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Test Database Access 

//======================================== Including the libraries.

#include <WiFi.h>

#include <Arduino.h>

#include <HTTPClient.h>

#include <Arduino_JSON.h>

//======================================== 

// Defines the Digital Pin of the "On Board LED".

#define ON_Board_LED 2 

//======================================== SSID and Password of your WiFi router.

//const char* ssid = "hola";

//const char* password = "12345678";

//======================================== 

//======================================== Variables for HTTP POST request data.

String postData = ""; //--> Variables sent for HTTP POST request data.

String payload = "";  //--> Variable for receiving response from HTTP POST.

//======================================== 

 

//_____________________ Subroutine to control LEDs after successfully fetching data from database.

void control_LEDs() {

  Serial.println();

  Serial.println("---------------control_LEDs()");

  JSONVar myObject = JSON.parse(payload);

  // JSON.typeof(jsonVar) can be used to get the type of the var

  if (JSON.typeof(myObject) == "undefined") {

    Serial.println("Parsing input failed!");

    Serial.println("---------------");

    return;

  }

  if (myObject.hasOwnProperty("Name")) {

    Serial.print("myObject[\"Name\"] = ");

    Serial.println(myObject["Name"]);

  }

  if (myObject.hasOwnProperty("RFID")) {

    Serial.print("myObject[\"RFID\"] = ");

    Serial.println(myObject["RFID"]);

  }

  Serial.println("---------------");

}

//________________________________________________________________________________ 

//______________________________ VOID SETUP()

void setup() {

  // put your setup code here, to run once:

  

  Serial.begin(115200); //--> Initialize serial communications with the PC.

  pinMode(ON_Board_LED,OUTPUT); //--> On Board LED port Direction output.

  delay(2000);

  //---------------------- Make WiFi on ESP32 in "STA/Station" mode and start connecting to WiFi Router/Hotspot.

  WiFi.mode(WIFI_STA);

  WiFi.begin("hola", "12345678");

  //---------------------------------------- 

  

  Serial.println();

  Serial.println("-------------");

  Serial.print("Connecting");

  //------------------------- The process of connecting the WiFi on the ESP32 to the WiFi Router/Hotspot.

  // The process timeout of connecting ESP32 with WiFi Hotspot / WiFi Router is 20 seconds.

  // If within 20 seconds the ESP32 has not been successfully connected to WiFi, the ESP32 will restart.

  // I made this condition because on my ESP32, there are times when it seems like it can't connect to WiFi, so it needs to be restarted to be able to connect to WiFi.

  int connecting_process_timed_out = 20; //--> 20 = 20 seconds.

  connecting_process_timed_out = connecting_process_timed_out * 2;

  while (WiFi.status() != WL_CONNECTED) {

    Serial.print(".");

    //................... Make the On Board Flashing LED on the process of connecting to the wifi router.

    /*digitalWrite(ON_Board_LED, HIGH);

    delay(250);

    digitalWrite(ON_Board_LED, LOW);

    delay(250);*/

    //........................................ 

    //........................................ Countdown "connecting_process_timed_out".

    if(connecting_process_timed_out > 0) connecting_process_timed_out--;

    if(connecting_process_timed_out == 0) {

      delay(1000);

      ESP.restart();

    }

    //........................................ 

  }

  //---------------------------------------- 

  

  //digitalWrite(ON_Board_LED, LOW); //--> Turn off the On Board LED when it is connected to the wifi router.

  

  //---------------------------------------- If successfully connected to the wifi router, the IP Address that will be visited is displayed in the serial monitor

  Serial.println();

  Serial.print("Successfully connected to : ");

  //Serial.print("IP address: ");

  //Serial.println(WiFi.localIP());

  Serial.println("-------------");

  //---------------------------------------- 

}

//________________________________________________________________________________ 

//________________________________________________________________________________ VOID LOOP()

void loop() {

  // put your main code here, to run repeatedly

  //---------------------------------------- Check WiFi connection status.

  if(WiFi.status()== WL_CONNECTED) {

    HTTPClient http;  //--> Declare object of class HTTPClient.

    int httpCode;     //--> Variables for HTTP return code.

    

    //........................................ Process to get LEDs data from database to control LEDs.

    postData = "id=200035";

    

    payload = "";

  

    digitalWrite(ON_Board_LED, HIGH);

    Serial.println();

    Serial.println("---------------getdata.php");

    // In this project I use local server or localhost with XAMPP application.

    // So make sure all PHP files are "placed" or "saved" or "run" in the "htdocs" folder.

    // I suggest that you create a new folder for this project in the "htdocs" folder.

    // The "htdocs" folder is in the "xampp" installation folder.

    // The order of the folders I recommend:

    // xampp\htdocs\your_project_folder_name\phpfile.php

    //

    // ESP32 accesses the data bases at this line of code: 

    // http.begin("http://REPLACE_WITH_YOUR_COMPUTER_IP_ADDRESS/REPLACE_WITH_PROJECT_FOLDER_NAME_IN_htdocs_FOLDER/getdata.php");

    // REPLACE_WITH_YOUR_COMPUTER_IP_ADDRESS = there are many ways to see the IP address, you can google it. 

    //                                         But make sure that the IP address used is "IPv4 address".

    // Example : http.begin("http://192.168.0.0/ESP32_MySQL_Database/Test/getdata.php");

    http.begin("http://192.168.43.88/Mysql_database/Test/getRFIDdata.php");  //--> Specify request destination

    http.addHeader("Content-Type", "application/x-www-form-urlencoded");        //--> Specify content-type header

   

    httpCode = http.POST(postData); //--> Send the request

    payload = http.getString();     //--> Get the response payload

  

    Serial.print("httpCode : ");

    Serial.println(httpCode); //--> Print HTTP return code

    Serial.print("payload  : ");

    Serial.println(payload);  //--> Print request response payload

    

    http.end();  //--> Close connection

    Serial.println("---------------");

    digitalWrite(ON_Board_LED, LOW);

    //........................................ 

    // Calls the control_LEDs() subroutine.

    control_LEDs();
    delay(1000);

  }

}

Upvotes: 0

Views: 534

Answers (1)

PMF
PMF

Reputation: 17278

You should use https://github.com/me-no-dev/EspExceptionDecoder to decode the stack trace. The tool presents a window where you can paste the exception stack (the line in the core dump that starts with Backtrace) and creates an user-readable stack dump. That should help you to get an idea where things went wrong.

Upvotes: 0

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