NO LOOPBACK IN LIBRARY WITH CALLBACK EXAMPLE WITH ESP32

[waged]

- always shows Guru Meditation Error: Core 1 panic'ed when trying to send CAN MESSAGE inside the onReceive function### ``(InstrFetchProhibited).

here is the onReceive method:

void onReceive(int packetSize)
{
  long CAN_ID;
  int cmd_time_gateway[8];
  uint8_t count = 0;

  // received a packet
  Serial.print("Received ");
  Serial.print("packet with id : 0x");
  //// (11 Bits Messsage ID) 2 bits MSG CMD  + 9 bits CAN ID.

  CAN_ID = CAN.packetId();
  CAN_ID &= 0x1FF;
  Serial.print(CAN_ID, HEX);
  Serial.print(" = ");
  Serial.print(CAN_ID);
  Serial.print(" and length ");
  Serial.println(packetSize);

  // only print packet data for non-RTR packets
  while (CAN.available())
  {
    // (8 Bytes data) 1 byte CMD 4 bytes timestamp 3 bytes Gateway.
    cmd_time_gateway[count] = CAN.read();
    Serial.print(cmd_time_gateway[count], HEX);
    count++;
  }
 
  switch (cmd_time_gateway[0])
  {
  case 0xFF:
    /* code for send own id  (response of request all id) */
    Serial.println(" - SEND REQUEST ALL ID RESPONSE(SEND OWN ID)");
    confirmSpecificNewID(CAN_ID);
    Serial.println(" - CAN ID CONFIRMED)");
    break;

  case 0xF0:
    /* code for confirmation of ID from rfid node */
    Serial.println(" - send confirmation request");
    break;

  case 0x0F:
    /* code for heartbeat */
    Serial.println(" - HEART BEAT");
    break;

  default:
    /* code for detection of RFID  module */
    Serial.println(" - CARD DETECTION");
    break;
  }
  Serial.println(" - ENDED");
}

after finishing the onReceive function and execute this

 void confirmSpecificNewID(long confirmedID)
{
  int id = confirmedID | 0x200;
  CAN.beginPacket(id, 8);
  CAN.write(confirmSpecificIDBuffer, 8);
  CAN.endPacket();
}

Take in note that nothing happens it just works brilliantly if i removed confirmSpecificNewID() which for me that onReceive unable to operate functions inside ??

[Petros144]

i am also getting the same error.

In my Loop() I need to send some Can data to recive it in the callback. I made some tests and if i Isolate the Can bus readings into a New Task, without the callback function it works (slowly...). & I need the speed...

But for now, This is my Error that I get:

rst:0xc (SW_CPU_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff0018,len:4 load:0x3fff001c,len:1100 load:0x40078000,len:10088 load:0x40080400,len:6380 entry 0x400806a4 Guru Meditation Error: Core 1 panic'ed (Coprocessor exception) Core 1 register dump: PC : 0x400d1adb PS : 0x00060031 A0 : 0x800d7bb8 A1 : 0x3ffbe9b0
A2 : 0x3ffc55b4 A3 : 0x00000001 A4 : 0x80093912 A5 : 0x00000000
A6 : 0x00000001 A7 : 0x3ffbaca0 A8 : 0x00000000 A9 : 0x000b4103
A10 : 0x000007e8 A11 : 0x000000fd A12 : 0x0ffdac00 A13 : 0x0000abab
A14 : 0x3ffb9a30 A15 : 0x00000000 SAR : 0x00000019 EXCCAUSE: 0x00000004
EXCVADDR: 0x00000000 LBEG : 0x400df614 LEND : 0x400df676 LCOUNT : 0x00000003
Core 1 was running in ISR context: EPC1 : 0x400d1adb EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x40082941

Backtrace: 0x400d1adb:0x3ffbe9b0 0x400d7bb5:0x3ffbea90 0x400d7bc1:0x3ffbeab0 0x40081819:0x3ffbead0 0x4000bfed:0x00000000

Rebooting...