Random restarts of the M5Stack Core 2 (code/backtrace included)



  • Hi! I am building a tower light. It has the following features:

    • Battery (AXP125)
    • 3 x 12 5050 Neopixel rings
    • Enclosure that fits the M5Stack Core 2
    • OOB, it goes into config mode (AP mode) and has a web interface to 'scan' and join a WiFi network as a client
    • RESTful API for controlling the lights

    I've been having random reboots of the M5Stack Core 2 using tasks. I've stripped down 99% of my code to a simple example. Any ideas how I can figure out whats causing the restarts?

    Also, M5.BtnA.wasPressed() doesn't work either when the button is pressed.

    My code:

    #include <Arduino.h>
    #include <M5Core2.h>
    #include <Adafruit_NeoPixel.h>
    #include "logo.h"
    
    // create a couple task handles
    TaskHandle_t TaskBtnScr;
    TaskHandle_t Task2;
    
    //BtnScrController: Displays sprite output and looks for button presses
    void BtnScrController( void * pvParameters ){
      for(;;){ // emulate a void loop()
        M5.update();
        if (M5.BtnA.wasPressed()) {
          Serial.println("Button was pressed.");
          delay(1000);
        }    
      } 
    }
    
    //Task2code: blinks an LED every 700 ms
    void Task2code( void * pvParameters ){
      Serial.print("Task2 running on core ");
      Serial.println(xPortGetCoreID());
    
      for(;;){
        M5.Lcd.clearDisplay();
        M5.Lcd.setCursor(0, 0);
        M5.Lcd.setTextColor(WHITE);
        M5.Lcd.println("task 2 code");
        delay(2500);
      }
    }
    
    
    void setup() {
      M5.begin(true, true, false, true, kMBusModeOutput);
      Serial.begin(115200);
    
      // logo
      M5.Lcd.pushImage(0, 0, 320, 240, (uint16_t *)gImage_logo);
      delay(2500);
      M5.Lcd.clearDisplay();
      M5.Lcd.setCursor(0, 0);
      M5.Lcd.setTextColor(WHITE);
    
      //create a task that will be executed in the Task1code() function, with priority 1 and executed on core 0
      xTaskCreatePinnedToCore(
                        BtnScrController,   /* Task function. */
                        "ButtonScreenController",     /* name of task. */
                        10000,       /* Stack size of task */
                        NULL,        /* parameter of the task */
                        1,           /* priority of the task */
                        &TaskBtnScr,      /* Task handle to keep track of created task */
                        0);          /* pin task to core 0 */                  
      delay(500); 
    
        //create a task that will be executed in the Task2code() function, with priority 1 and executed on core 1
      xTaskCreatePinnedToCore(
                        Task2code,   /* Task function. */
                        "Task2",     /* name of task. */
                        10000,       /* Stack size of task */
                        NULL,        /* parameter of the task */
                        1,           /* priority of the task */
                        &Task2,      /* Task handle to keep track of created task */
                        1);          /* pin task to core 1 */
        delay(500); 
    }
    
    void loop() {
      
    }
    

    Terminal:

    
    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:2
    load:0x3fff0018,len:4
    load:0x3fff001c,len:1044
    load:0x40078000,len:10124
    load:0x40080400,len:5828
    entry 0x400806a8
    [E][sd_diskio.cpp:194] sdCommand(): Card Failed! cmd: 0x00
    [E][sd_diskio.cpp:775] sdcard_mount(): f_mount failed: (3) The physical drive cannot work
    [E][sd_diskio.cpp:194] sdCommand(): Card Failed! cmd: 0x00
    Task2 running on core 1
    E (19249) task_wdt: Task watchdog got triggered. The following tasks did not reset the watchdog in time:
    E (19249) task_wdt:  - IDLE0 (CPU 0)
    E (19249) task_wdt: Tasks currently running:
    E (19249) task_wdt: CPU 0: ButtonScreenCon
    E (19249) task_wdt: CPU 1: loopTask
    E (19249) task_wdt: Aborting.
    abort() was called at PC 0x400e7717 on core 0
    
    ELF file SHA256: 0000000000000000
    
    Backtrace: 0x4008a490:0x3ffbe4f0 0x4008a709:0x3ffbe510 0x400e7717:0x3ffbe530 0x40086195:0x3ffbe550 0x4000cffa:0x3ffb4600 0x40081573:0x3ffb4620 0x400d1d70:0x3ffb4640 0x400d1ee5:0x3ffb4690 0x400d15f5:0x3ffb46b0 0x400d14ca:0x3ffb46d0 0x4008b70e:0x3ffb46f0
    
    Rebooting...
    ets Jul 29 2019 12:21:46
    
    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:2
    load:0x3fff0018,len:4
    load:0x3fff001c,len:1044
    load:0x40078000,len:10124
    load:0x40080400,len:5828
    entry 0x400806a8
    [E][sd_diskio.cpp:194] sdCommand(): Card Failed! cmd: 0x00
    [E][sd_diskio.cpp:775] sdcard_mount(): f_mount failed: (3) The physical drive cannot work
    [E][sd_diskio.cpp:194] sdCommand(): Card Failed! cmd: 0x00
    Task2 running on core 1
    E (19249) task_wdt: Task 
    


  • Hello @JackRazors

    to avoid the crash add a delay(1) into the for loop of the BtnScrController() task function. This allows the system to reset the watchdog.

    Thanks
    Felix



  • I don't know if you got this sorted, but we're not really supposed to user core 0, as this can cause panics. That's advice from Espressif. Also, adding in a delay @felmue said should really help in allowing the thread to free-up some cycles.