Guru Meditation Error: Core 0 panic'ed

fester225 · April 25, 2024, 2:37am

Apple Mac OS 14.4.1
Firefox 125.0.1
Arduino IDE 2.3.2  
Arduino Nano ESP32
Arduino C++
AsyncUDP

I got my program to compile, and even load! The point is to prove I can communicate between microcontrollers using UDP. When one receives a packet, it responds by returning another packet to the source. Everything was fine until a little while after I turned on the second processor. It responded with a Guru Meditation Error: Core 0 panic'ed. (I presume this is when the two processors started to communicate.) What happened? Is this a problem with AsyncUDP?
(So far the verbose error codes, on upload, have not shown where the copy of AsyncUDP.h IDE is using is.)
(There are three more truly inconsequential sections I'm leaving out. Everything interesting is below.)

//client/main

#include <WiFi.h>
#include <AsyncUDP.h>
#include <UniversalTimer.h>
#include <arduino_secrets.h>

#define LED_BUILTIN 2 // The built-in LED is connected to pin 2

//const char ssid[] = "ABCD";
//const char password[] = "123456";

UniversalTimer WiFi_transmit_start(5000, false);
UniversalTimer WiFi_transmit_delay(2000, false);
UniversalTimer blink_on(250, false);
IPAddress ip(192, 168, 1, 143);
IPAddress remoteIP(192, 168, 1, 54);
uint16_t IPport = 57400;
uint8_t sensorValue;
uint32_t remote_IP;
uint8_t data_in = 0;
uint8_t data_out = 0;

void read_incoming();
void write_outgoing();

//WiFiClass WiFi;
AsyncUDP udp;
AsyncUDPPacket *packet;

void setup() {
  Serial.begin(115200);
  delay(2000);

  // Set ADC resolution (optional)
  analogReadResolution(8); // 8-bit resolution

  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);


  //listen(const IPAddress addr, uint16_t port)
  udp.listen(ip, IPport);

  udp.onPacket([](AsyncUDPPacket packet) {

    read_incoming();

    Serial.println("end of lambda");
  }); //udp.onPacket([](AsyncUDPPacket packet)

  WiFi_transmit_delay.start();

  Serial.println("end of setup()");
  delay(10);

} //void setup()



void loop() {

  //Serial.println("start loop()");

    //this ensures somebody starts transmitting
  if (!WiFi_transmit_start.isRunning()) WiFi_transmit_start.start();

  //Serial.print("UniversalTimer = ");
  //Serial.println(WiFi_transmit_start.getTimerValue());


    //.check() indicates timeout has expired
    if (WiFi_transmit_delay.check() | WiFi_transmit_start.check()) {
      Serial.println("pre-write_outgoing()");
      //returns data_out
      write_outgoing();
   
      //size_t write(uint8_t): Writes a single byte to the current packet.

      //udp.writeTo((uint8_t *)message, strlen(message), remoteIp, remotePort)
      udp.writeTo(&data_out, 1, remoteIP, IPport);

      WiFi_transmit_delay.resetTimerValue();
      WiFi_transmit_start.resetTimerValue();

      data_out = 0;

      //udp.flush(); //Stops the UDP connection and cleans up resources.

    } //if (WiFi_transmit_delay.check() | WiFi_transmit_start.check()) 

  //Serial.println("pre-blink()");

  //blink();

  data_in = 0;

  //Serial.println("end of loop()");

} //void loop()


15:38:36.395 -> pre-write_outgoing()

15:38:36.395 -> data_out = 121

15:38:41.386 -> pre-write_outgoing()

15:38:41.386 -> data_out = 168

15:38:46.393 -> pre-write_outgoing()

15:38:46.393 -> data_out = 236

15:38:51.120 -> Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

15:38:51.121 -> 

15:38:51.121 -> Core  0 register dump:

15:38:51.121 -> PC      : 0x400d286e  PS      : 0x00060330  A0      : 0x800d29c7  A1      : 0x3ffcdaf0  

15:38:51.121 -> A2      : 0x3ffc3b28  A3      : 0x3ffcdbcc  A4      : 0x3ffcdf28  A5      : 0x0000e038  

15:38:51.155 -> A6      : 0x9cdf29b3  A7      : 0x00000000  A8      : 0x800d2869  A9      : 0x3ffcdad0  

15:38:51.155 -> A10     : 0x00000000  A11     : 0x3ffcdc24  A12     : 0x00000004  A13     : 0x3ffcdb84  
15:38:51.155 -> A14     : 0x9cdf29b3  A15     : 0x00000000  SAR     : 0x00000000  EXCCAUSE: 0x0000001c  

15:38:51.155 -> EXCVADDR: 0x00000000  LBEG    : 0x400898b8  LEND    : 0x400898ce  LCOUNT  : 0xffffffff  

15:38:51.186 -> 

15:38:51.186 -> 

15:38:51.186 -> Backtrace: 0x400d286b:0x3ffcdaf0 0x400d29c4:0x3ffcdb20 0x400d3f99:0x3ffcdbb0 0x400d3fea:0x3ffcdc50

15:38:51.186 -> 
15:38:51.186 -> 

15:38:51.186 -> 

15:38:51.186 -> 

15:38:51.186 -> ELF file SHA256: c4c651b5651fd826

15:38:51.186 -> 

15:38:51.449 -> Rebooting...

15:38:51.449 -> ets Jul 29 2019 12:21:46

15:38:51.449 -> 

15:38:51.449 -> rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

15:38:51.449 -> configsip: 0, SPIWP:0xee

15:38:51.449 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00

15:38:51.449 -> mode:DIO, clock div:1

15:38:51.449 -> load:0x3fff0030,len:1344

15:38:51.449 -> load:0x40078000,len:13964

15:38:51.449 -> load:0x40080400,len:3600

15:38:51.449 -> entry 0x400805f0

15:38:53.815 -> end of setup()

15:38:55.818 -> pre-write_outgoing()

15:38:55.818 -> data_out = 123

15:38:56.114 -> Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

15:38:56.146 -> 
15:38:56.146 -> Core  0 register dump:

15:38:56.146 -> PC      : 0x400d286e  PS      : 0x00060330  A0      : 0x800d29c7  A1      : 0x3ffcdaf0  

15:38:56.146 -> A2      : 0x3ffc3b28  A3      : 0x3ffcdbcc  A4      : 0x3ffcdec8  A5      : 0x0000e038  

15:38:56.146 -> A6      : 0x9cdf29b3  A7      : 0x00000000  A8      : 0x800d2869  A9      : 0x3ffcdad0  

15:38:56.146 -> A10     : 0x00000000  A11     : 0x3ffcdc24  A12     : 0x00000004  A13     : 0x3ffcdb84  

15:38:56.178 -> A14     : 0x9cdf29b3  A15     : 0x00000000  SAR     : 0x00000000  EXCCAUSE: 0x0000001c  

15:38:56.178 -> EXCVADDR: 0x00000000  LBEG    : 0x400898b8  LEND    : 0x400898ce  LCOUNT  : 0xffffffff  

15:38:56.178 -> 

15:38:56.178 -> 

15:38:56.178 -> Backtrace: 0x400d286b:0x3ffcdaf0 0x400d29c4:0x3ffcdb20 0x400d3f99:0x3ffcdbb0 0x400d3fea:0x3ffcdc50

15:38:56.178 -> 

15:38:56.178 -> 

15:38:56.178 -> 

15:38:56.178 -> 

15:38:56.178 -> ELF file SHA256: c4c651b5651fd826

15:38:56.178 -> 
15:38:56.441 -> Rebooting...

15:38:56.441 -> ets Jul 29 2019 12:21:46

15:38:56.441 -> 

15:38:56.441 -> rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

15:38:56.441 -> configsip: 0, SPIWP:0xee

15:38:56.441 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00

15:38:56.472 -> mode:DIO, clock div:1

15:38:56.473 -> load:0x3fff0030,len:1344

15:38:56.473 -> load:0x40078000,len:13964

15:38:56.473 -> load:0x40080400,len:3600

15:38:56.473 -> entry 0x400805f0

15:38:58.843 -> end of setup()

15:39:00.819 -> pre-write_outgoing()

15:39:00.819 -> data_out = 123

15:39:01.081 -> Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.

15:39:01.081 -> 

15:39:01.081 -> Core  0 register dump:

15:39:01.081 -> PC      : 0x400d286e  PS      : 0x00060330  A0      : 0x800d29c7  A1      : 0x3ffcdaf0  

15:39:01.081 -> A2      : 0x3ffc3b28  A3      : 0x3ffcdbcc  A4      : 0x3ffce270  A5      : 0x0000e038  

15:39:01.081 -> A6      : 0x9cdf29b3  A7      : 0x00000000  A8      : 0x800d2869  A9      : 0x3ffcdad0  

15:39:01.113 -> A10     : 0x00000000  A11     : 0x3ffcdc24  A12     : 0x00000004  A13     : 0x3ffcdb84  

15:39:01.113 -> A14     : 0x9cdf29b3  A15     : 0x00000000  SAR     : 0x00000000  EXCCAUSE: 0x0000001c  

15:39:01.113 -> EXCVADDR: 0x00000000  LBEG    : 0x400898b8  LEND    : 0x400898ce  LCOUNT  : 0xffffffff  

15:39:01.113 -> 

15:39:01.113 -> 

15:39:01.113 -> Backtrace: 0x400d286b:0x3ffcdaf0 0x400d29c4:0x3ffcdb20 0x400d3f99:0x3ffcdbb0 0x400d3fea:0x3ffcdc50

15:39:01.146 -> 

15:39:01.146 ->

horace · April 25, 2024, 5:16am

have a read of how-to-get-the-best-out-of-this-forum
in particular you don't appear to have included the code definitions for

void read_incoming();
void write_outgoing();

problem sounds like an array overrun, memory corruption etc

DrDiettrich · April 25, 2024, 8:57am

Show that code.

fester225 · April 25, 2024, 1:36pm

The code for the second processor is identical to the first, with the exception that the addresses for ip and remoteIP are reversed.

DrDiettrich · April 25, 2024, 1:40pm

How do you know which code is for which core?

qubits-us · April 25, 2024, 1:54pm

Congratulations!!
Now the real fun begins..
I see you making the Guru mad..
exception address is 0 probably touching something that doesn't exist..

You know when people say this, it's usually where the issue resides..

glad you're uploading..

good luck.. ~q

qubits-us · April 25, 2024, 3:00pm

Guessing.. You be using this inside of read_incoming()..

probably should pass in the packet..

   void read_incoming(AsyncUDPPacket packet);

and then in setup, something like this maybe..

 udp.onPacket([](AsyncUDPPacket packet) {
    read_incoming(packet);
  });

good luck.. ~q

system · October 22, 2024, 3:01pm

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