ESP32 Forum

Posted: **Mon Jul 31, 2023 3:59 pm**

I am running the following code, and getting an exception randomly on line 17 below (line 136 in source).

Code: [Select all] [Expand/Collapse]

if (millis() >= nextCheck)
    {
      nextCheck = millis() + 1215;
      CANEnabled = false;
 
      CAN.end();
      if (getChipRevision() <= 1)
      {
        Serial.println("Starting CAN for REV1 ESP32");
        if (!CAN.begin(250E3))
        {
          Serial.println("Starting CAN failed!");
        }
      }
      else
      {
      if (!CAN.begin(500E3))
        {
          Serial.println("Starting CAN failed!");
        }
        else
        {
          Serial.println("Restarted CAN!");
        }
      }
      CANEnabled = true;
    }

GeSHi © Codebox Plus Extension

This is a CAN library code, and the line inside that is causing the exception is gpio_set_direction(_rxPin, GPIO_MODE_INPUT);

Code: [Select all] [Expand/Collapse]

Guru Meditation Error: Core  0 panic'ed (LoadProhibited). Exception was unhandled.
 
Core  0 register dump:
PC      : 0x400f8fe0  PS      : 0x00060130  A0      : 0x800f9921  A1      : 0x3ffbd020
A2      : 0xc00fffff  A3      : 0x00000000  A4      : 0x00000001  A5      : 0x00060123  
A6      : 0x00000000  A7      : 0x00000000  A8      : 0xffffffff  A9      : 0x00000001
A10     : 0x00013ffc  A11     : 0x00000000  A12     : 0x00000004  A13     : 0x3ffb21e4  
A14     : 0x00000003  A15     : 0x00060023  SAR     : 0x00000008  EXCCAUSE: 0x0000001c
EXCVADDR: 0xffffffff  LBEG    : 0x4000c46c  LEND    : 0x4000c477  LCOUNT  : 0xffffffff  
 
Backtrace: 0x400f8fdd:0x3ffbd020 0x400f991e:0x3ffbd050 0x400e9ee1:0x3ffbd080 0x400d3fda:0x3ffbd0a0 0x4008d50d:0x3ffbd0d0
 
  #0  0x400f8fdd:0x3ffbd020 in gpio_ll_input_enable at C:\Users\cmeyer\.platformio\packages\framework-espidf\components\hal\esp32\include/hal/gpio_ll.h:319
      (inlined by) gpio_input_enable at C:\Users\cmeyer\.platformio\packages\framework-espidf\components\driver/gpio.c:191
  #1  0x400f991e:0x3ffbd050 in gpio_set_direction at C:\Users\cmeyer\.platformio\packages\framework-espidf\components\driver/gpio.c:284
  #2  0x400e9ee1:0x3ffbd080 in ESP32SJA1000Class::begin(long) at .pio/libdeps/esp32dev/CAN/src/ESP32SJA1000.cpp:59
  #3  0x400d3fda:0x3ffbd0a0 in TaskCANloop(void*) at src/ACC_Comm/canbus.cpp:136
  #4  0x4008d50d:0x3ffbd0d0 in vPortTaskWrapper at C:\Users\cmeyer\.platformio\packages\framework-espidf\components\freertos\port\xtensa/port.c:142
 
 
 
 
ELF file SHA256: 7a7d73fa1820f810

What can I do to prevent these random exceptions?

ESP32 Forum

ESP32 Exception when reseting CAN controller

ESP32 Exception when reseting CAN controller