ESP32 Forum

Posted: **Mon Jan 22, 2024 10:30 pm**

Hello
this is my arduino code for an esp32 which just setups wifi and then runs the setGoogleCalendar() function forever:

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#include <WiFi.h>
#include <HTTPClient.h>
#include "time.h"
 
// Replace with your network credentials
const char* ssid = "FRITZ!Box 6490 Cable";
const char* password = "xxxx";
 
// NTP server to request epoch time
const char* ntpServer = "fritz.box";
 
const String gooleAppsScriptUrl = "https://script.google.com/macros/s/xxxxxxxxxxxx/exec";
 
RTC_DATA_ATTR int bootCount = 0;
 
//Multithreading
TaskHandle_t googleCalendar;
 
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {             
    if(millis() < 12000){
      Serial.print('.');
      delay(1000);
    }
    else {
      ESP.restart();
    }
  }
  Serial.println(WiFi.localIP());
}
 
void loop() {
  // put your main code here, to run repeatedly:
  if (googleCalendar == NULL){
    xTaskCreate(
    setGoogleCalendar
    ,  "Google calendar request"
    ,  20000  // Stack size
    ,  NULL  // When no parameter is used, simply pass NULL
    ,  1  // Priority
    ,  &googleCalendar // With task handle we will be able to manipulate with this task.
    );
  }
}
 
void setGoogleCalendar(void *pvParameters) {
  (void) pvParameters;
  
  HTTPClient http;
  http.begin(gooleAppsScriptUrl.c_str());
  http.setFollowRedirects(HTTPC_STRICT_FOLLOW_REDIRECTS);
  String payload = "";
  int httpStatus = http.GET();
 
  Serial.println("this is the last thing that gets printed in the second run");
 
  if (httpStatus == 200){
    Serial.println("this will not get printed in the second run");
    delay(500);
    payload = http.getString();
  }
  else {
    Serial.println("failed google calendar http request: " + httpStatus);
    return;
  }
  
  Serial.println(payload);
 
  http.end();
  googleCalendar = NULL;
  vTaskDelete(NULL);
}

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when i run the setGoogleCalendar function once everything works as it should. However the second time it only runs until the first Serial.println and spits out this error:

Guru Meditation Error: Core 0 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x400d29ec: 00250602 afa2f01d f0a0223c
Core 0 register dump:
PC : 0x400d29f0 PS : 0x00060130 A0 : 0x00000000 A1 : 0x3fffc790
A2 : 0xa38d7f39 A3 : 0x3fffc880 A4 : 0x00000000 A5 : 0x00000000
A6 : 0x00000000 A7 : 0x00000000 A8 : 0xa38d7f39 A9 : 0x3fffc770
A10 : 0x3fffc7bc A11 : 0x400d4d78 A12 : 0xa38d7f39 A13 : 0x00000000
A14 : 0x3fffc828 A15 : 0x3fffc838 SAR : 0x00000017 EXCCAUSE: 0x00000000
EXCVADDR: 0x00000000 LBEG : 0x400899bc LEND : 0x400899c7 LCOUNT : 0x00000000

Backtrace: 0x400d29ed:0x3fffc790

ELF file SHA256: a313233634d34ef3

when i put it in the stack trace decoder i get this result:

0x400d29ec: setGoogleCalendar(void*) at C:\Users\johan\OneDrive\Dokumente\Arduino\Freertostestwithtask_copy_20240122224400\Freertostestwithtask_copy_20240122224400.ino:76
0x400d29f0: setGoogleCalendar(void*) at C:\Users\johan\OneDrive\Dokumente\Arduino\Freertostestwithtask_copy_20240122224400\Freertostestwithtask_copy_20240122224400.ino:76
0x400d4d78: TLSTraits::~TLSTraits() at C:\Users\johan\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\libraries\HTTPClient\src\HTTPClient.cpp:64
0x400d29ed: setGoogleCalendar(void*) at C:\Users\johan\OneDrive\Dokumente\Arduino\Freertostestwithtask_copy_20240122224400\Freertostestwithtask_copy_20240122224400.ino:76

Due to the error occuring in the last line with only a bracket i expected it to have something to do with rtos tasks not being closed but according to espressif documentation this error should not occur.
Now i have noticed that core 0 panics which runs the wifi functions? and occurs in the http library. However this error only happens when i set the function as a seperate task and does not happen when i let it run normaly.
How is this behaviour possible?

Thank you for your help in advance

Posted: **Tue Jan 23, 2024 4:03 am**

Not sure if it's the issue, but there's a 'return' in your task (when httpStatus is not 200). You cannot do that; that'll panic; you need to do the vTaskDelete(NULL) there as well.

ESP32 Forum

FreeRTOS http only working once (IllegalInstruction)

FreeRTOS http only working once (IllegalInstruction)

Re: FreeRTOS http only working once (IllegalInstruction)