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libraries/audio-tools/examples/examples-communication/a2dp/player-sdfat-a2dp/README.md

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+# A Simple SdFat Audio Player
+
+The example demonstrates how to implement an __MP3 Player__: which provides the data from a SD drive and provides the audio via A2DP (e.g. to a Bluetooth Speaker): The __AudioSourceSdFat class__ builds on the [SdFat Library](https://github.com/greiman/SdFat) from Bill Greiman which provides FAT16/FAT32 and exFAT support. 
+
+## SD Card
+
+Here is the information how to wire the SD card to the ESP32
+
+| SD    | ESP32 
+|-------|-----------------------
+| CS    | VSPI-CS0 (GPIO 05) 
+| SCK   | VSPI-CLK (GPIO 18) 
+| MOSI  | VSPI-MOSI (GPIO 23) 
+| MISO  | VSPI-MISO (GPIO 19) 
+| VCC   | VIN (5V) 
+| GND   | GND 
+
+![SD](https://www.pschatzmann.ch/wp-content/uploads/2021/04/sd-module.jpeg)
+
+
+
+
+## Dependencies
+
+- https://github.com/pschatzmann/arduino-audio-tools
+- https://github.com/pschatzmann/arduino-libhelix
+- https://github.com/greiman/SdFat
+- https://github.com/pschatzmann/ESP32-A2DP

libraries/audio-tools/examples/examples-communication/a2dp/player-sdfat-a2dp/player-sdfat-a2dp.ino

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+/**
+ * @file player-sdfat-a2dp.ino
+ * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-player/player-sdfat-a2dp/README.md
+ * 
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+//remove this, to find issues regarding mp3 decoding
+#define HELIX_LOGGING_ACTIVE false
+
+#include "AudioTools.h"
+#include "AudioTools/Communication/A2DPStream.h"
+#include "AudioTools/Disk/AudioSourceSDFAT.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+
+const char *startFilePath="/";
+const char* ext="mp3";
+AudioSourceSDFAT source(startFilePath, ext); // , PIN_AUDIO_KIT_SD_CARD_CS);
+A2DPStream out;
+MP3DecoderHelix decoder;
+AudioPlayer player(source, out, decoder);
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // setup player
+  // Setting up SPI if necessary with the right SD pins by calling 
+  // SPI.begin(PIN_AUDIO_KIT_SD_CARD_CLK, PIN_AUDIO_KIT_SD_CARD_MISO, PIN_AUDIO_KIT_SD_CARD_MOSI, PIN_AUDIO_KIT_SD_CARD_CS);
+  player.setVolume(0.1);
+  player.begin();
+
+  // setup output - We send the test signal via A2DP - so we conect to a Bluetooth Speaker
+  auto cfg = out.defaultConfig(TX_MODE);
+  cfg.silence_on_nodata = true; // prevent disconnect when there is no audio data
+  cfg.name = "LEXON MINO L";  // set the device here. Otherwise the first available device is used for output
+  //cfg.auto_reconnect = true;  // if this is use we just quickly connect to the last device ignoring cfg.name
+  out.begin(cfg);
+
+
+}
+
+void loop() {
+  player.copy();
+}