teensy_sd_card.ino

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

#define BUTTON 1

AudioMixer4              mixer1;             // mixers to combine wav file and audio shield inputs
AudioMixer4              mixer2;
AudioPlaySdWav           playWav1;
AudioOutputI2S           audioOutput;

// wire up the interfaces between audio components with patch cords
// mixer inputs
AudioConnection          patchCord1(playWav1, 0, mixer1, 0);
AudioConnection          patchCord3(playWav1, 1, mixer2, 0);

// mixer outputs
AudioConnection          patchCord5(mixer1, 0, audioOutput, 0);
AudioConnection          patchCord6(mixer2, 0, audioOutput, 1);

AudioControlSGTL5000     sgtl5000_1;

// Use these with the Teensy Audio Shield
#define SDCARD_CS_PIN    10
#define SDCARD_MOSI_PIN  7
#define SDCARD_SCK_PIN   14


byte prevSong = 15;
int songCount = 0;


void setup() {
  pinMode(BUTTON, INPUT_PULLUP);
  analogReference(INTERNAL);
  analogReadResolution(12);
  randomSeed(analogRead(17)*analogRead(16));

  Serial.begin(9600);

  // Audio connections require memory to work.  For more
  // detailed information, see the MemoryAndCpuUsage example
  AudioMemory(8);

  // Comment these out if not using the audio adaptor board.
  // This may wait forever if the SDA & SCL pins lack
  // pullup resistors
  sgtl5000_1.enable();
  sgtl5000_1.volume(1);

  mixer1.gain(0, 1);
  mixer2.gain(0, 1);

  SPI.setMOSI(SDCARD_MOSI_PIN);
  SPI.setSCK(SDCARD_SCK_PIN);

  if (!(SD.begin(SDCARD_CS_PIN))) {
    // stop here, but print a message repetitively
    while (1) {
      Serial.println("Unable to access the SD card");
      delay(500);
    }
  }
}

void playFile(const char *filename)
{
  Serial.print("Playing file: ");
  Serial.println(filename);

  // Start playing the file.  This sketch continues to
  // run while the file plays.
  playWav1.play(filename);

  // A brief delay for the library read WAV info
  delay(5);

  // Simply wait for the file to finish playing.
  while (playWav1.isPlaying()) {

  }
}


void loop() {

  if (digitalRead(BUTTON) == LOW) {
    //Put a function in here to play if the button has been pressed
    playFile("SOUND1.WAV");
    //Removing the comment '//' lines below will add the functions to the program
    //playRandomFile();
    //playFileSequentially();
  }
}
























/*
  / ----------------------------OTHER FUNCTIONS----------------------------------------- /
*/
void playRandomFile() {

  int songSelection = random(5);
  Serial.println(songSelection);
  while (songSelection == prevSong) {
    songSelection = random(14);
  }

  switch (songSelection) {
    case 0:
      playFile("SOUND1.WAV");  // filenames are always uppercase 8.3 format
      break;
    case 1:
      playFile("SOUND2.WAV");
      break;
    case 2:
      playFile("SOUND3.WAV");
      break;
    case 3:
      playFile("SOUND4.WAV");
      break;
    case 4:
      playFile("SOUND5.WAV");
      break;

  }
  delay(1000);
  prevSong = songSelection;

}


void playFileSequentially() {
  Serial.println(songCount);

  if (songCount > 4) {
    songCount = 0;
  }

  switch (songCount) {
    case 0:
      playFile("SOUND1.WAV");  // filenames are always uppercase 8.3 format
      break;
    case 1:
      playFile("SOUND2.WAV");
      break;
    case 2:
      playFile("SOUND3.WAV");
      break;
    case 3:
      playFile("SOUND4.WAV");
      break;
    case 4:
      playFile("SOUND5.WAV");
      break;

  }
  delay(1000);
  soungCount++;
}