In the .cpp file change
to
In the .h file change
to

Try adding a dummy return value to following function in IS31FL3733.cpp or better yet, make it a void : uint8_t IS31FL3733::set_page(uint8_t page) { write_reg(0xFE, 0xC5); write_reg(0xFD, page); } I had this exact same problem after moving to 2.0.11 ESP32 Arduino. See https://esp32.com/viewtopic.php...

I've just made a major leap in versions of the ESP32 libraries. And Arduino IDE (1.8.19) Raspberry Pi 64 bit Bullseye distro. I linked my code to a library. In that library there was a function that was declared as returning a value. However, there was a path in the code where a value was not return...

As it does not find any WAV files, wav is not initialised.
You then try and access it in loop().
I'm pretty sure this will cause the core panic.
As for why it's not seeing any files, I don't know the answer.

This is a very abbreviated form of the code I use. Hopefully it will show you what I am doing. I don't know if this will compile. I've not got my system to hand. And it is MOST DEFINITELY NOT the most elegant of code. #include <Arduino.h> #include "SdFat.h" SdFat _sd; File _myFile; #define MAX_RECOR...

I do something very similar. I log GPS/MEMS/BME/Bluetooth OBD/Timestamp every 100mS and store to an SD card. I found that most writes to the SD card took <5mS. Sometimes however they took approx 320mS. This is due to the way the blocks are written to the SD card at a low level and can't be changed (...

I use one of those adapters that comes with every MicroSD card. I solder header pins to it so it will fit onto a Veroboard.
Works on the ESP32 @ 3v3 no problem as there's no electronics on the adapter...

I use the 1.0.0.4 Arduino libraries. I have an ESP32 datalogger (to SD card). It connects to a BLE OBD2 scanner amongst other devices. When logging is stopped I want to email the file to myself. However, I could NEVER get this working. Either the WiFi would crash or the Bluetooth re-connection would...

I've just upgraded from 1.0.2 libraries to 1.0.4. My application (On a HELTEC kit32 with OLED) talks to a BLE OBD sensor. It is configured as a large app (No OTA). It also has an SD card attached, a GPS on serial, a BME280 and a 9DOF device on I2C and finally an IR sensor with remote keypad. It all ...