Customization of Adafruit's music player for an alarm

alarm_player.ino

// 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 M0 or 32u4
#if defined(__AVR__) || defined(ARDUINO_SAMD_FEATHER_M0)
  #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

// Feather ESP8266
#elif 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)
  #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_FEATHER52)
  #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
#endif


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 BLE interface
  //pinMode(8, INPUT_PULLUP);

  // Wait for serial port to be opened, remove this line for 'standalone' operation
  while (!Serial) { delay(1); }

  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(4,4);
  
#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
#elif defined(ESP32)
  // no IRQ! doesn't work yet :/
#else
  // If DREQ is on an interrupt pin we can do background
  // audio playing
  musicPlayer.useInterrupt(VS1053_FILEPLAYER_PIN_INT);  // DREQ int
#endif
  
  alarm();
  
}

void alarm(){
  Serial.println(F("Playing full track 001"));
  musicPlayer.playFullFile("track001.mp3");
}

void loop() {
  Serial.print(".");
  // File is playing in the background
  if (musicPlayer.stopped()) {
    alarm();
  }
  
  delay(100);
}



/// File listing helper
void printDirectory(File dir, int numTabs) {
   while(true) {
     
     File entry =  dir.openNextFile();
     if (! entry) {
       // no more files
       //Serial.println("**nomorefiles**");
       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();
   }
}