Rcswitch endless reboot on esp cam with "Guru Meditation Error: Core 1 panic'ed (LoadProhibited)" error

[nathalizator]

I'm succesfully using rcswich with a RF receiver and ESP32-cam but when i just try to merge the receiver demo with an esp cam server code it cause a endless reboot of my esp with an error message. The esp cam server code is working well before merging and it starts rebooting with a error message as soon as i add this part :

  Serial.print("Ready to receive.");
  mySwitch.enableReceive(RXD2);
  delay(1000);

I've seen someone with a similar problem but not sure how to implement the solution with my code. Any help would be appreciated if you think this case is related : https://github.com/espressif/esp-who/issues/90#issuecomment-518010560

The error message

:10:12.211 -> rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
10:10:12.211 -> configsip: 0, SPIWP:0xee
10:10:12.211 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
10:10:12.211 -> mode:DIO, clock div:2
10:10:12.211 -> load:0x3fff0018,len:4
10:10:12.211 -> load:0x3fff001c,len:1216
10:10:12.211 -> ho 0 tail 12 room 4
10:10:12.245 -> load:0x40078000,len:9720
10:10:12.245 -> ho 0 tail 12 room 4
10:10:12.245 -> load:0x40080400,len:6364
10:10:12.245 -> entry 0x400806b8
10:10:12.940 -> 
10:10:13.941 -> Ready to receive.Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
10:10:15.047 -> Core 1 register dump:
10:10:15.047 -> PC      : 0x401584a3  PS      : 0x00060833  A0      : 0x801362bf  A1      : 0x3ffb1e50  
10:10:15.047 -> A2      : 0x00000000  A3      : 0x3ffb8058  A4      : 0x00000001  A5      : 0x00000001  
10:10:15.047 -> A6      : 0x00060820  A7      : 0x00000000  A8      : 0x80135bf1  A9      : 0x3ffb1e20  
10:10:15.081 -> A10     : 0x02000000  A11     : 0x401357ac  A12     : 0x3ffb1e38  A13     : 0x00000001  
10:10:15.081 -> A14     : 0x00060a20  A15     : 0x00000000  SAR     : 0x00000007  EXCCAUSE: 0x0000001c  
10:10:15.081 -> EXCVADDR: 0x00000000  LBEG    : 0x4000c46c  LEND    : 0x4000c477  LCOUNT  : 0x00000000  
10:10:15.081 -> 
10:10:15.081 -> Backtrace: 0x401584a3:0x3ffb1e50 0x401362bc:0x3ffb1e70 0x40138020:0x3ffb1ea0 0x4013819f:0x3ffb1ed0 0x400d2482:0x3ffb1f00 0x400d585b:0x3ffb1fb0 0x4008bc19:0x3ffb1fd0
10:10:15.115 -> 

Interpretation of the error with Exception Decoder :

PC: 0x401584a3: esp_intr_get_cpu at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/intr_alloc.c line 780
EXCVADDR: 0x00000000

Decoding stack results
0x401584a3: esp_intr_get_cpu at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/intr_alloc.c line 780
0x401362bc: gpio_isr_handler_add at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/driver/gpio.c line 389
0x40138020: camera_init at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/components/esp32-camera/driver/camera.c line 1205
0x4013819f: esp_camera_init at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/components/esp32-camera/driver/camera.c line 1268
0x400d2482: setup() at /Users/admin/Downloads/Code_Security_Camera_ESP32CAM_Blynk_02/Code_Security_Camera_ESP32CAM_Blynk_02.ino line 116
0x400d585b: loopTask(void*) at /Users/admin/Library/Arduino15/packages/esp32/hardware/esp32/1.0.4/cores/esp32/main.cpp line 14
0x4008bc19: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

Here is the complete code:

#define CAMERA_MODEL_AI_THINKER // Has PSRAM

#include "camera_pins.h"

#define BTN 13
#define PHOTO 14
#define LED 4

#include <RCSwitch.h>
RCSwitch mySwitch = RCSwitch();
#define RXD2 2

#include "config.h"
const char* ssid = secret_ssid;
const char* password = secret_pwd;
char auth[] = secret_auth;  //sent by Blynk

String local_IP;

void startCameraServer();

void takePhoto()
{
  digitalWrite(LED, HIGH);
  delay(200);
  uint32_t randomNum = random(50000);
  Serial.println("http://" + local_IP + "/capture?_cb=" + (String)randomNum);
  Blynk.setProperty(V1, "urls", "http://" + local_IP + "/capture?_cb=" + (String)randomNum);
  digitalWrite(LED, LOW);
  delay(1000);
}

void setup() {
  Serial.begin(115200);
  pinMode(RXD2, INPUT);
  pinMode(LED, OUTPUT);
  pinMode(BTN, INPUT_PULLUP);
  Serial.setDebugOutput(true);
  Serial.println();
  delay(1000);

Serial.print("Ready to receive.");
  mySwitch.enableReceive(RXD2);
  delay(1000);

  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = Y2_GPIO_NUM;
  config.pin_d1 = Y3_GPIO_NUM;
  config.pin_d2 = Y4_GPIO_NUM;
  config.pin_d3 = Y5_GPIO_NUM;
  config.pin_d4 = Y6_GPIO_NUM;
  config.pin_d5 = Y7_GPIO_NUM;
  config.pin_d6 = Y8_GPIO_NUM;
  config.pin_d7 = Y9_GPIO_NUM;
  config.pin_xclk = XCLK_GPIO_NUM;
  config.pin_pclk = PCLK_GPIO_NUM;
  config.pin_vsync = VSYNC_GPIO_NUM;
  config.pin_href = HREF_GPIO_NUM;
  config.pin_sscb_sda = SIOD_GPIO_NUM;
  config.pin_sscb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;

  // if PSRAM IC present, init with UXGA resolution and higher JPEG quality
  //                      for larger pre-allocated frame buffer.
  if (psramFound()) {
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 2;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }

  // camera init
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }

  sensor_t * s = esp_camera_sensor_get();
  // initial sensors are flipped vertically and colors are a bit saturated
  if (s->id.PID == OV3660_PID) {
    s->set_vflip(s, 1); // flip it back
    s->set_brightness(s, 1); // up the brightness just a bit
    s->set_saturation(s, -2); // lower the saturation
  }
  // drop down frame size for higher initial frame rate
  s->set_framesize(s, FRAMESIZE_QVGA);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  startCameraServer();

  Serial.print("Camera Ready! Use 'http://");
  Serial.print(WiFi.localIP());
  local_IP = WiFi.localIP().toString();
  Serial.println("' to connect");
  Blynk.begin(auth, ssid, password);

}

void loop() {
  Serial.println(BTN);
  // put your main code here, to run repeatedly:
  Blynk.run();

  if (digitalRead(BTN) == LOW) {
    Serial.println("Send Notification");
    Blynk.notify("Il y a une personne à la porte!");
    Serial.println("Capture Photo");
    Serial.println(BTN);
    takePhoto();
    delay(3000);
  } else if (digitalRead(BTN) == HIGH) { };

  /*
    if (mySwitch.available()) {

    Serial.print(mySwitch.getReceivedValue());
    unsigned long int num = mySwitch.getReceivedValue();
    Serial.println(num);

    mySwitch.resetAvailable();
    }
  */

}

[me-no-dev]

please decode the backtrace with ESPExceptionDecoder so that we can see where the issue happens.

[nathalizator]

please decode the backtrace with ESPExceptionDecoder so that we can see where the issue happens.

you can see it in my original message above but here it is again:

PC: 0x401584a3: esp_intr_get_cpu at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/intr_alloc.c line 780
EXCVADDR: 0x00000000

Decoding stack results
0x401584a3: esp_intr_get_cpu at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp32/intr_alloc.c line 780
0x401362bc: gpio_isr_handler_add at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/driver/gpio.c line 389
0x40138020: camera_init at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/components/esp32-camera/driver/camera.c line 1205
0x4013819f: esp_camera_init at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/components/esp32-camera/driver/camera.c line 1268
0x400d2482: setup() at /Users/admin/Downloads/Code_Security_Camera_ESP32CAM_Blynk_02/Code_Security_Camera_ESP32CAM_Blynk_02.ino line 116
0x400d585b: loopTask(void*) at /Users/admin/Library/Arduino15/packages/esp32/hardware/esp32/1.0.4/cores/esp32/main.cpp line 14
0x4008bc19: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

[me-no-dev]

If RCSwitch is using GPIO Interrupts, then it's having a conflict with the camera driver. There is currently no workaround for this situation, but one is planned for near future.

[nathalizator]

Hello ! it means that we can't have 2 interrupt on the esp cam ? Also, can you be more specific on "near future", does it means 1 week, 1 month, 1 year ? Just to see if i should look for another solution or wait for the fix. Thanks! @me-no-dev

[nathalizator]

@me-no-dev Hello again, any update on this ?

[nathalizator]

@me-no-dev Hello, any news ?

[AndyFBs]

I've encountered this well over 100 times. It always comes down to the same thing. The ESP32-CAM is a duel core module. There is Core 0 and Core 1. When the module appears to constantly reboot after about 1 second it, in my case, has always been due to the following either in my code, or a library that I am using that has been written with single core in mind.

I consider it an issue with the Arduino IDE compiler. Here is a tiny code fragment showing the issue....

Explaination of code: I have some data stored in the EEPROM, and at is shown in a webpage.

If 'char * wchtml=' is used, then memcpy will fail in setup with this Core 1 panic issue. If 'char wchtml[366]=' is used, then memcpy will be fine in setup.

---

` // With the following the EEPROM.get is done in Core 0. The memcpy in the setup function is on Core 1. // wchtml is not initialised prior to the memcpy ergo CRASH.

struct uEepromData { uint8_t Ver; uint8_t Mode; char MID[5]; char OtherData[500]; };

char host[14] = "ABCDABC_xxxxx"; uEepromData EPData;

// the following line is the difference. This causes an issue for Core 1 when altering in setup char * wchtml="<!DOCTYPE html>...";

void setup(){
EEPROM.begin(sizeof(uEepromData)); EEPROM.get(0, EPData);

memcpy(&wchtml[59],EPData.MID,5); // The line crash happens

memcpy(&host[8],EPData.MID,5); host[13]=0;
}

void loop(){

}

---

// With the following Core 0 does the EEPROM.get. Core 1 does the initialisation of wchtml and the memcpy.

struct uEepromData { uint8_t Ver; uint8_t Mode; char MID[5]; char OtherData[500]; };

char host[14] = "ABCDABC_xxxxx"; uEepromData EPData;

// the following line is the difference. This works char wchtml[366]="<!DOCTYPE html>...365 characters in total";

void setup(){ EEPROM.begin(sizeof(uEepromData)); EEPROM.get(0, EPData);

memcpy(&wchtml[59],EPData.MID,5);

memcpy(&host[8],EPData.MID,5); host[13]=0;
}

void loop(){

}`

[me-no-dev]

char * wchtml="<script>var ABSerial='xxxxx';var FwVer='yyy';</script>..."; must be const! This is a pointer to where const char wchtml_data[] = "<script>var ABSerial='xxxxx';var FwVer='yyy';</script>...365 characters in total"; is located.

that is why declaring it as array works. There is nothing wrong with the compiler.