ESP32 Stack configuration (reloaded)

maxgerhardt · April 26, 2021, 2:49pm

As for the ESP32, a FreeRTOS task is created that runs setup() and loop(). That task has a certain stack size.

espressif/arduino-esp32/blob/7856de7a57420e494176c16c5138174fe2c1dad0/cores/esp32/main.cpp#L44-L52


      
          extern "C" void app_main()
          {
          #if ARDUINO_SERIAL_PORT //Serial used for USB CDC
              USB.begin();
          #endif
              loopTaskWDTEnabled = false;
              initArduino();
              xTaskCreateUniversal(loopTask, "loopTask", CONFIG_ARDUINO_LOOP_STACK_SIZE, NULL, 1, &loopTaskHandle, ARDUINO_RUNNING_CORE);
          }

The CONFIG_ARDUINO_LOOP_STACK_SIZE comes from the preconfigured ESP-IDF base

github.com

espressif/arduino-esp32/blob/5d9b98c9b04e591044078ac2304da95e8c7e997b/tools/sdk/esp32/include/config/sdkconfig.h#L66-L66


      
          #define CONFIG_ARDUINO_LOOP_STACK_SIZE 8192

So unfortunately you can’t override it with build_flags = -D CONFIG_ARDUINO_LOOP_STACK_SIZE=16384 in the platformio.ini because this define hardcodes it without checking if it’s previously defined.

So you should first try and edit it C:\Users\<user>\.platformio\packages\framework-arduinoespressif32\tools\sdk\include\config\sdkconfig.h, recompile the application and see if it still fails. If it works, you can manage it more cleanly with a on-the-fly patch and a tiny bit of scripting.