ESP32 and the Adafruit Music Maker FeatherWing without Interrupts

feather_player.ino

// Adafruit Sample Sketch modified to not use Interrupts
// Documented here: https://randomerrors.dev/posts/2023/esp32-and-the-adafruit-music-maker-featherwing/

// Specifically for use with the Adafruit Feather, the pins are pre-set here!

// include SPI, MP3 and SD libraries
#include <SPI.h>
#include <SD.h>
#include <Adafruit_VS1053.h>

// These are the pins used
#define VS1053_RESET -1  // VS1053 reset pin (not used!)

// Feather ESP8266
#if defined(ESP8266)
#define VS1053_CS 16   // VS1053 chip select pin (output)
#define VS1053_DCS 15  // VS1053 Data/command select pin (output)
#define CARDCS 2       // Card chip select pin
#define VS1053_DREQ 0  // VS1053 Data request, ideally an Interrupt pin

// Feather ESP32
#elif defined(ESP32) && !defined(ARDUINO_ADAFRUIT_FEATHER_ESP32S2)
#define VS1053_CS 32    // VS1053 chip select pin (output)
#define VS1053_DCS 33   // VS1053 Data/command select pin (output)
#define CARDCS 14       // Card chip select pin
#define VS1053_DREQ 15  // VS1053 Data request, ideally an Interrupt pin

// Feather Teensy3
#elif defined(TEENSYDUINO)
#define VS1053_CS 3    // VS1053 chip select pin (output)
#define VS1053_DCS 10  // VS1053 Data/command select pin (output)
#define CARDCS 8       // Card chip select pin
#define VS1053_DREQ 4  // VS1053 Data request, ideally an Interrupt pin

// WICED feather
#elif defined(ARDUINO_STM32_FEATHER)
#define VS1053_CS PC7     // VS1053 chip select pin (output)
#define VS1053_DCS PB4    // VS1053 Data/command select pin (output)
#define CARDCS PC5        // Card chip select pin
#define VS1053_DREQ PA15  // VS1053 Data request, ideally an Interrupt pin

#elif defined(ARDUINO_NRF52832_FEATHER)
#define VS1053_CS 30    // VS1053 chip select pin (output)
#define VS1053_DCS 11   // VS1053 Data/command select pin (output)
#define CARDCS 27       // Card chip select pin
#define VS1053_DREQ 31  // VS1053 Data request, ideally an Interrupt pin

// Feather RP2040
#elif defined(ARDUINO_ADAFRUIT_FEATHER_RP2040)
#define VS1053_CS 8    // VS1053 chip select pin (output)
#define VS1053_DCS 10  // VS1053 Data/command select pin (output)
#define CARDCS 7       // Card chip select pin
#define VS1053_DREQ 9  // VS1053 Data request, ideally an Interrupt pin

// Feather M4, M0, 328, ESP32S2, nRF52840 or 32u4
#else
#define VS1053_CS 6    // VS1053 chip select pin (output)
#define VS1053_DCS 10  // VS1053 Data/command select pin (output)
#define CARDCS 5       // Card chip select pin
// DREQ should be an Int pin *if possible* (not possible on 32u4)
#define VS1053_DREQ 9  // VS1053 Data request, ideally an Interrupt pin
#endif

int counter = 0;

Adafruit_VS1053_FilePlayer musicPlayer =
  Adafruit_VS1053_FilePlayer(VS1053_RESET, VS1053_CS, VS1053_DCS, VS1053_DREQ, CARDCS);

void setup() {
  Serial.begin(115200);

  // if you're using Bluefruit or LoRa/RFM Feather, disable the radio module
  //pinMode(8, INPUT_PULLUP);

  // Wait for serial port to be opened, remove this line for 'standalone' operation
  while (!Serial) { delay(1); }
  delay(500);
  Serial.println("\n\nAdafruit VS1053 Feather Test");

  if (!musicPlayer.begin()) {  // initialise the music player
    Serial.println(F("Couldn't find VS1053, do you have the right pins defined?"));
    while (1)
      ;
  }

  Serial.println(F("VS1053 found"));

  musicPlayer.sineTest(0x44, 500);  // Make a tone to indicate VS1053 is working

  if (!SD.begin(CARDCS)) {
    Serial.println(F("SD failed, or not present"));
    while (1)
      ;  // don't do anything more
  }
  Serial.println("SD OK!");

  // list files
  printDirectory(SD.open("/"), 0);

  // Set volume for left, right channels. lower numbers == louder volume!
  musicPlayer.setVolume(10, 10);

  // REMOVE THIS BECAUSE THIS ENABLES INTERRUPTS
  // #if defined(__AVR_ATmega32U4__)
  //   // Timer interrupts are not suggested, better to use DREQ interrupt!
  //   // but we don't have them on the 32u4 feather...
  //   musicPlayer.useInterrupt(VS1053_FILEPLAYER_TIMER0_INT); // timer int
  // #else
  //   // If DREQ is on an interrupt pin we can do background
  //   // audio playing
  //   musicPlayer.useInterrupt(VS1053_FILEPLAYER_PIN_INT);  // DREQ int
  // #endif

  // Play a file in the background, REQUIRES interrupts!
  // Serial.println(F("Playing full track 001"));
  // musicPlayer.playFullFile("/soundfile1.mp3");

  // Serial.println(F("Playing track 002"));
  // musicPlayer.startPlayingFile("/soundfile1.mp3");
}

void loop() {
  // Are we playing a sound file?
  if (musicPlayer.stopped()) {
    // No, then start a sound file
    Serial.println("\nStarting sound file");
    // =========================================
    // we can't play the file this way because it uses interrupts:
    // musicPlayer.playFullFile("/snore01.mp3");
    // =========================================
    // With this approach, it *starts* playing it only,
    // Then you use feedBuffer (below) to feed more sound
    // file data into the player.
    musicPlayer.startPlayingFile("/snore01.mp3");
  }

  // https://forums.adafruit.com/viewtopic.php?p=953823&hilit=music+maker+esp32#p953823
  musicPlayer.feedBuffer();
  
   // print a dot so we can tell the loop is executing
  Serial.print(".");
  // put a blank line every 25 periods
  counter += 1;
  if (counter > 25) {
    counter = 0;
    Serial.println();
  }
  
  delay(100);
}

/// File listing helper
void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry = dir.openNextFile();
    if (!entry) {
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}