##########################
Frequently Asked Questions
##########################

How to modify an sdkconfig option in Arduino?
---------------------------------------------

Arduino-esp32 project is based on ESP-IDF. While ESP-IDF supports configuration of various compile-time options (known as "Kconfig options" or "sdkconfig options") via a "menuconfig" tool, this feature is not available in Arduino IDE.

To use the arduino-esp32 core with a modified sdkconfig option, you need to use ESP-IDF to compile Arduino libraries. Please see :doc:`esp-idf_component` and :doc:`lib_builder` for the two solutions available.

Note that modifying ``sdkconfig`` or ``sdkconfig.h`` files found in the arduino-esp32 project tree **does not** result in changes to these options. This is because ESP-IDF libraries are included into the arduino-esp32 project tree as pre-built libraries.

How to compile libs with different debug level?
-----------------------------------------------

The short answer is ``esp32-arduino-lib-builder/configs/defconfig.common:44``. A guide explaining the process can be found here <guides/core_debug>

SPIFFS mount failed
-------------------
When you come across and error like this:

.. code-block:: shell

   E (588) SPIFFS: mount failed, -10025
   [E][SPIFFS.cpp:47] begin(): Mounting SPIFFS failed! Error: -1

Try enforcing format on fail in your code by adding ``true`` in the ``begin`` method such as this:

.. code-block:: c++

   SPIFFS.begin(true);

See the method prototype for reference: ``bool begin(bool formatOnFail=false, const char * basePath="/spiffs", uint8_t maxOpenFiles=10, const char * partitionLabel=NULL);``