Update WavFilePlayer for I2S or S/PDIF or DAC

Audio.h

@@ -80,6 +80,7 @@
 #include "output_dac.h"
 #include "output_i2s.h"
 #include "output_pwm.h"
+#include "output_spdif.h"
 #include "play_memory.h"
 #include "play_queue.h"
 #include "play_sd_raw.h"

examples/WavFilePlayer/WavFilePlayer.ino

@@ -1,7 +1,24 @@
 // Simple WAV file player example
 //
-// Requires the audio shield:
-//   http://www.pjrc.com/store/teensy3_audio.html
+// Three types of output may be used, by configuring the code below.
+//
+//   1: Digital I2S - Normally used with the audio shield:
+//         http://www.pjrc.com/store/teensy3_audio.html
+//
+//   2: Digital S/PDIF - Connect pin 22 to a S/PDIF transmitter
+//         https://www.oshpark.com/shared_projects/KcDBKHta
+//
+//   3: Analog DAC - Connect the DAC pin to an amplified speaker
+//         http://www.pjrc.com/teensy/gui/?info=AudioOutputAnalog
+//
+// To configure the output type, first uncomment one of the three
+// output objects.  If not using the audio shield, comment out
+// the sgtl5000_1 lines in setup(), so it does not wait forever
+// trying to configure the SGTL5000 codec chip.
+//
+// The SD card may connect to different pins, depending on the
+// hardware you are using.  Uncomment or configure the SD card
+// pins to match your hardware.
 //
 // Data files to put on your SD card can be downloaded here:
 //   http://www.pjrc.com/teensy/td_libs_AudioDataFiles.html
@@ -13,27 +30,41 @@
 #include <SPI.h>
 #include <SD.h>
 
-// GUItool: begin automatically generated code
-AudioPlaySdWav           playWav1;       //xy=154,78
-AudioOutputI2S           i2s1;           //xy=334,89
-AudioConnection          patchCord1(playWav1, 0, i2s1, 0);
-AudioConnection          patchCord2(playWav1, 1, i2s1, 1);
-AudioControlSGTL5000     sgtl5000_1;     //xy=240,153
-// GUItool: end automatically generated code
+AudioPlaySdWav           playWav1;
+// Use one of these 3 output types: Digital I2S, Digital S/PDIF, or Analog DAC
+AudioOutputI2S           audioOutput;
+//AudioOutputSPDIF       audioOutput;
+//AudioOutputAnalog      audioOutput;
+AudioConnection          patchCord1(playWav1, 0, audioOutput, 0);
+AudioConnection          patchCord2(playWav1, 1, audioOutput, 1);
+AudioControlSGTL5000     sgtl5000_1;
+
+// Use these with the audio adaptor board
+#define SDCARD_CS_PIN    10
+#define SDCARD_MOSI_PIN  7
+#define SDCARD_SCK_PIN   14
+
+// Use these for the SD+Wiz820 or other adaptors
+//#define SDCARD_CS_PIN    4
+//#define SDCARD_MOSI_PIN  11
+//#define SDCARD_SCK_PIN   13
 
 void setup() {
   Serial.begin(9600);
 
   // Audio connections require memory to work.  For more
   // detailed information, see the MemoryAndCpuUsage example
-  AudioMemory(5);
+  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(0.5);
 
-  SPI.setMOSI(7);
-  SPI.setSCK(14);
-  if (!(SD.begin(10))) {
+  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");