ESP32 Guru Meditation error

Projects General Guidance
1

Hello, I'm using esp32 mcu to set up 2 different tasks, both via wifi. Task1 obtains and displays data in the serial monitor, whereas task2 controls a relay ON/OFF-wise. here is the code:

#include <WiFi.h>
#include <HTTPClient.h>
#include <HX711_ADC.h>
#if defined(ESP8266) || defined(ESP32) || defined(AVR)
#include <EEPROM.h>
#endif

WiFiServer server(80);

TaskHandle_t Task1;
TaskHandle_t Task2;

const int HX711_dat = 18;
const int HX711_clk = 19;               
HX711_ADC LoadCell(HX711_dat, HX711_clk); 

const int relay_pin = 26;  // 
const char* wifi_name = "**********";  // 
const char* wifi_pass = "*********";         // 

WiFiClient client;

void Task1code(void* pvParameters);  // 
void Task2code(void* pvParameters);

void setup() {
  Serial.begin(57600);
  delay(100); 
  pinMode(relay_pin, OUTPUT); 

  Serial.print("Connecting to ");
  Serial.println(wifi_name);
  WiFi.begin(wifi_name, wifi_pass);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);   
  }

  Serial.println("Connection Successful");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println("Type the above IP address into the browser search bar");

  server.begin(); 

  float calibrationValue;
  calibrationValue = 23.09; 

  LoadCell.begin();                 
  unsigned long stabilizingtime = 2000; 
  boolean _tare = true;
  LoadCell.start(stabilizingtime, _tare); 
  if (LoadCell.getTareTimeoutFlag()) {
    Serial.println("Timeout, check MCU>HX711 wiring and pin designations");
  } else {
    LoadCell.setCalFactor(calibrationValue);
    Serial.println("Startup is complete");
  }

  xTaskCreatePinnedToCore(
    Task1code, 
    "Task1",   
    10000,  
    NULL,      
    1,       
    &Task1, 
    0        
  );

  xTaskCreatePinnedToCore(
    Task2code,
    "Task2",  
    10000,    
    NULL,     
    1,        
    &Task2,  
    1       
  );

  delay(150);  
}

void loop() {
}

void Task1code(void* pvParameters) {
  static unsigned long t = 0;
  static boolean newDataReady = 0;
  const int serialPrintInterval = 30;  //increase value to slow down serial print activity

  // check for new data/start next conversion:
  if (LoadCell.update()) newDataReady = true;

  // get smoothed value from the dataset:
  if (newDataReady) {
    if (millis() > t + serialPrintInterval) {
      float i = LoadCell.getData();
      Serial.print("Load_cell output val: ");
      Serial.println(i);
      newDataReady = 0;
      t = millis();
    }
  }

  // receive command from serial terminal, send 't' to initiate tare operation:
  if (Serial.available() > 0) {
    char inByte = Serial.read();
    if (inByte == 't') LoadCell.tareNoDelay();
  }

  // check if last tare operation is complete:
  if (LoadCell.getTareStatus() == true) {
    Serial.println("Tare complete");
  }
}



void Task2code(void* pvParameters) {
  Serial.print("Task2 running on core ");
  Serial.println(xPortGetCoreID()); 
  WiFiClient client;
  while (1) {
    client = server.available(); 

    if (client) {                  
      String currentLine = "";     
      while (client.connected()) {
        if (client.available()) {  
          char c = client.read();  
          if (c == '\n') {         
            if (currentLine.length() == 0) {
              client.println("HTTP/1.1 200 OK");
              client.println("Content-type:text/html");
              client.println();
              client.println("<!DOCTYPE HTML>");
              client.println("<html><body><center><h2>ESP32 Web Server</h2>");
              client.println("<h3>Click to turn ON/OFF the Relay</h3>");
              client.println("<a href=\"/RELAYON\"><button>RELAY ON</button></a>");
              client.println("<a href=\"/RELAYOFF\"><button>RELAY OFF</button></a>");
              client.println("</center></body></html>");
              break;
            } else {
              currentLine = "";
            }
          } else if (c != '\r') {
            currentLine += c;
          }
          if (currentLine.endsWith("GET /RELAYON")) {  // Changed from "/LEDON" to "/RELAYON"
            digitalWrite(relay_pin, HIGH);
          }
          if (currentLine.endsWith("GET /RELAYOFF")) {  // Changed from "/LEDOFF" to "/RELAYOFF"
            digitalWrite(relay_pin, LOW);
          }
        }
      }
      client.stop();
    }
  }
}

the problem is that I'm receiving this error in the serial monitor:

Type the above IP address into the browser search bar
Startup is complete
Guru Meditation Error: Core 0 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x400d2aa4: 2502adf5 f01d0284 a1004136
Core 0 register dump:
PC : 0x400d2aaa PS : 0x00060030 A0 : 0x00000000 A1 : 0x3ffcef30
A2 : 0x3ffc4164 A3 : 0x3ffc3f84 A4 : 0x3ffc3f50 A5 : 0x00000000
A6 : 0x00000000 A7 : 0x00000000 A8 : 0x800d2aa0 A9 : 0x3ffcef10
A10 : 0x00000000 A11 : 0x00000000 A12 : 0x00000014 A13 : 0x00000000
A14 : 0x3ffb8188 A15 : 0x80000001 SAR : 0x0000000a EXCCAUSE: 0x00000000
EXCVADDR: 0x00000000 LBEG : 0x4008576d LEND : 0x40085775 LCOUNT : 0x00000027

Backtrace: 0x400d2aa7:0x3ffcef30

ELF file SHA256: 52d10e35e48d70b2

Rebooting...
how can I fix this?

2

Don't use any Arduino library (including the core libraries inside mbed OS tasks. Many Arduino libraries aren't programmed to be executed in parallel. You might be doing calculations in one task but always use the main task to execute Arduino library code.

1 Like
3

Thank you!

4

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