//#include <SD.h>
#include <SPI.h>

//Add the SdFat Libraries
#include <SdFat.h>
#include <FreeStack.h>

//and the MP3 Shield Library
#include <SFEMP3Shield.h>

// Below is not needed if interrupt driven. Safe to remove if not using.
#if defined(USE_MP3_REFILL_MEANS) && USE_MP3_REFILL_MEANS == USE_MP3_Timer1
#include <TimerOne.h>
#elif defined(USE_MP3_REFILL_MEANS) && USE_MP3_REFILL_MEANS == USE_MP3_SimpleTimer
#include <SimpleTimer.h>
#endif

SdFat sd;

SFEMP3Shield MP3player;
int16_t last_ms_char; // milliseconds of last recieved character from Serial port.
int8_t buffer_pos; // next position to recieve character from Serial port.

char buffer[6]; // 0-35K+null

void setup() {

uint8_t result; //result code from some function as to be tested at later time.

Serial.begin(115200);

Serial.print(F(“F_CPU = “));
Serial.println(F_CPU);
Serial.print(F(“Free RAM = “)); // available in Version 1.0 F() bases the string to into Flash, to use less SRAM.
Serial.print(FreeStack(), DEC); // FreeRam() is provided by SdFatUtil.h
Serial.println(F(” Should be a base line of 1017, on ATmega328 when using INTx”));

//Initialize the SdCard.
if(!sd.begin(SD_SEL, SPI_FULL_SPEED)) sd.initErrorHalt();
// depending upon your SdCard environment, SPI_HAVE_SPEED may work better.
if(!sd.chdir(“/”)) sd.errorHalt(“sd.chdir”);

//Initialize the MP3 Player Shield
result = MP3player.begin();
//check result, see readme for error codes.
if(result != 0) {
Serial.print(F(“Error code: “));
Serial.print(result);
Serial.println(F(” when trying to start MP3 player”));
if( result == 6 ) {
Serial.println(F(“Warning: patch file not found, skipping.”)); // can be removed for space, if needed.
Serial.println(F(“Use the \”d\” command to verify SdCard can be read”)); // can be removed for space, if needed.
}
}

#if (0)
// Typically not used by most shields, hence commented out.
Serial.println(F(“Applying ADMixer patch.”));
if(MP3player.ADMixerLoad(“admxster.053”) == 0) {
Serial.println(F(“Setting ADMixer Volume.”));
MP3player.ADMixerVol(-3);
}
#endif

help();
last_ms_char = millis(); // stroke the inter character timeout.
buffer_pos = 0; // start the command string at zero length.
parse_menu(‘l’); // display the list of files to play

}

void loop() {

// Below is only needed if not interrupt driven. Safe to remove if not using.
#if defined(USE_MP3_REFILL_MEANS) \
&& ( (USE_MP3_REFILL_MEANS == USE_MP3_SimpleTimer) \
|| (USE_MP3_REFILL_MEANS == USE_MP3_Polled) )

MP3player.available();
#endif

char inByte;
if (Serial.available() > 0) {
inByte = Serial.read();
if ((0x20 <= inByte) && (inByte <= 0x126)) { // strip off non-ASCII, such as CR or LF
if (isDigit(inByte)) { // macro for ((inByte >= ‘0’) && (inByte <= ‘9’))
// else if it is a number, add it to the string
buffer[buffer_pos++] = inByte;
} else {
// input char is a letter command
buffer_pos = 0;
parse_menu(inByte);
}
buffer[buffer_pos] = 0; // update end of line
last_ms_char = millis(); // stroke the inter character timeout.
}
} else if ((millis() – last_ms_char) > 500 && ( buffer_pos > 0 )) {
// ICT expired and have something
if (buffer_pos == 1) {
// look for single byte (non-number) menu commands
parse_menu(buffer[buffer_pos – 1]);

} else if (buffer_pos > 5) {
// dump if entered command is greater then uint16_t
Serial.println(F(“Ignored, Number is Too Big!”));

} else {
// otherwise its a number, scan through files looking for matching index.
int16_t fn_index = atoi(buffer);
SdFile file;
char filename[13];
sd.chdir(“/”,true);
uint16_t count = 1;
while (file.openNext(sd.vwd(),O_READ))
{
file.getName(filename, sizeof(filename));
if ( isFnMusic(filename) ) {

if (count == fn_index) {
Serial.print(F(“Index “));
SerialPrintPaddedNumber(count, 5 );
Serial.print(F(“: “));
Serial.println(filename);
Serial.print(F(“Playing filename: “));
Serial.println(filename);
int8_t result = MP3player.playMP3(filename);
//check result, see readme for error codes.
if(result != 0) {
Serial.print(F(“Error code: “));
Serial.print(result);
Serial.println(F(” when trying to play track”));
}
char title[30]; // buffer to contain the extract the Title from the current filehandles
char artist[30]; // buffer to contain the extract the artist name from the current filehandles
char album[30]; // buffer to contain the extract the album name from the current filehandles
MP3player.trackTitle((char*)&title);
MP3player.trackArtist((char*)&artist);
MP3player.trackAlbum((char*)&album);

//print out the arrays of track information
Serial.write((byte*)&title, 30);
Serial.println();
Serial.print(F(“by: “));
Serial.write((byte*)&artist, 30);
Serial.println();
Serial.print(F(“Album: “));
Serial.write((byte*)&album, 30);
Serial.println();
break;
}
count++;
}
file.close();
}

}

//reset buffer to start over
buffer_pos = 0;
buffer[buffer_pos] = 0; // delimit
}

delay(100);
}

uint32_t millis_prv;

void parse_menu(byte key_command) {

uint8_t result; // result code from some function as to be tested at later time.

// Note these buffer may be desired to exist globably.
// but do take much space if only needed temporarily, hence they are here.
char title[30]; // buffer to contain the extract the Title from the current filehandles
char artist[30]; // buffer to contain the extract the artist name from the current filehandles
char album[30]; // buffer to contain the extract the album name from the current filehandles

Serial.print(F(“Received command: “));
Serial.write(key_command);
Serial.println(F(” “));

//if s, stop the current track
if(key_command == ‘s’) {
Serial.println(F(“Stopping”));
MP3player.stopTrack();

//if 1-9, play corresponding track
} else if(key_command >= ‘1’ && key_command <= ‘9’) {
//convert ascii numbers to real numbers
key_command = key_command – 48;

#if USE_MULTIPLE_CARDS
sd.chvol(); // assign desired sdcard’s volume.
#endif
//tell the MP3 Shield to play a track
result = MP3player.playTrack(key_command);

//check result, see readme for error codes.
if(result != 0) {
Serial.print(F(“Error code: “));
Serial.print(result);
Serial.println(F(” when trying to play track”));
} else {

Serial.println(F(“Playing:”));

//we can get track info by using the following functions and arguments
//the functions will extract the requested information, and put it in the array we pass in
MP3player.trackTitle((char*)&title);
MP3player.trackArtist((char*)&artist);
MP3player.trackAlbum((char*)&album);

//print out the arrays of track information
Serial.write((byte*)&title, 30);
Serial.println();
Serial.print(F(“by: “));
Serial.write((byte*)&artist, 30);
Serial.println();
Serial.print(F(“Album: “));
Serial.write((byte*)&album, 30);
Serial.println();
}

//if +/- to change volume
} else if((key_command == ‘-‘) || (key_command == ‘+’)) {
union twobyte mp3_vol; // create key_command existing variable that can be both word and double byte of left and right.
mp3_vol.word = MP3player.getVolume(); // returns a double uint8_t of Left and Right packed into int16_t

if(key_command == ‘-‘) { // note dB is negative
// assume equal balance and use byte[1] for math
if(mp3_vol.byte[1] >= 254) { // range check
mp3_vol.byte[1] = 254;
} else {
mp3_vol.byte[1] += 2; // keep it simpler with whole dB’s
}
} else {
if(mp3_vol.byte[1] <= 2) { // range check
mp3_vol.byte[1] = 2;
} else {
mp3_vol.byte[1] -= 2;
}
}
// push byte[1] into both left and right assuming equal balance.
MP3player.setVolume(mp3_vol.byte[1], mp3_vol.byte[1]); // commit new volume
Serial.print(F(“Volume changed to -“));
Serial.print(mp3_vol.byte[1]>>1, 1);
Serial.println(F(“[dB]”));

//if < or > to change Play Speed
} else if((key_command == ‘>’) || (key_command == ‘<‘)) {
uint16_t playspeed = MP3player.getPlaySpeed(); // create key_command existing variable
// note playspeed of Zero is equal to ONE, normal speed.

if(key_command == ‘>’) { // note dB is negative
// assume equal balance and use byte[1] for math
if(playspeed >= 254) { // range check
playspeed = 5;
} else {
playspeed += 1; // keep it simpler with whole dB’s
}
} else {
if(playspeed == 0) { // range check
playspeed = 0;
} else {
playspeed -= 1;
}
}
MP3player.setPlaySpeed(playspeed); // commit new playspeed
Serial.print(F(“playspeed to “));
Serial.println(playspeed, DEC);

} else if(key_command == ‘f’ || key_command == ‘F’) {
uint32_t offset = 0;
if (key_command == ‘F’) {
offset = 2000;
}

//create a string with the filename
char trackName[] = “track001.mp3”;

#if USE_MULTIPLE_CARDS
sd.chvol(); // assign desired sdcard’s volume.
#endif
//tell the MP3 Shield to play that file
result = MP3player.playMP3(trackName, offset);
//check result, see readme for error codes.
if(result != 0) {
Serial.print(F(“Error code: “));
Serial.print(result);
Serial.println(F(” when trying to play track”));
}

/* Display the file on the SdCard */
} else if(key_command == ‘d’) {
if(!MP3player.isPlaying()) {
// prevent root.ls when playing, something locks the dump. but keeps playing.
// yes, I have tried another unique instance with same results.
// something about SdFat and its 500byte cache.
Serial.println(F(“Files found (name date time size):”));
sd.ls(LS_R | LS_DATE | LS_SIZE);
} else {
Serial.println(F(“Busy Playing Files, try again later.”));
}

/* Get and Display the Audio Information */
} else if(key_command == ‘i’) {
MP3player.getAudioInfo();

} else if(key_command == ‘p’) {
if( MP3player.getState() == playback) {
MP3player.pauseMusic();
Serial.println(F(“Pausing”));
} else if( MP3player.getState() == paused_playback) {
MP3player.resumeMusic();
Serial.println(F(“Resuming”));
} else {
Serial.println(F(“Not Playing!”));
}

} else if(key_command == ‘t’) {
int8_t teststate = MP3player.enableTestSineWave(126);
if(teststate == -1) {
Serial.println(F(“Un-Available while playing music or chip in reset.”));
} else if(teststate == 1) {
Serial.println(F(“Enabling Test Sine Wave”));
} else if(teststate == 2) {
MP3player.disableTestSineWave();
Serial.println(F(“Disabling Test Sine Wave”));
}

} else if(key_command == ‘S’) {
Serial.println(F(“Current State of VS10xx is.”));
Serial.print(F(“isPlaying() = “));
Serial.println(MP3player.isPlaying());

Serial.print(F(“getState() = “));
switch (MP3player.getState()) {
case uninitialized:
Serial.print(F(“uninitialized”));
break;
case initialized:
Serial.print(F(“initialized”));
break;
case deactivated:
Serial.print(F(“deactivated”));
break;
case loading:
Serial.print(F(“loading”));
break;
case ready:
Serial.print(F(“ready”));
break;
case playback:
Serial.print(F(“playback”));
break;
case paused_playback:
Serial.print(F(“paused_playback”));
break;
case testing_memory:
Serial.print(F(“testing_memory”));
break;
case testing_sinewave:
Serial.print(F(“testing_sinewave”));
break;
}
Serial.println();

} else if(key_command == ‘b’) {
Serial.println(F(“Playing Static MIDI file.”));
MP3player.SendSingleMIDInote();
Serial.println(F(“Ended Static MIDI file.”));

#if !defined(__AVR_ATmega32U4__)
} else if(key_command == ‘m’) {
uint16_t teststate = MP3player.memoryTest();
if(teststate == -1) {
Serial.println(F(“Un-Available while playing music or chip in reset.”));
} else if(teststate == 2) {
teststate = MP3player.disableTestSineWave();
Serial.println(F(“Un-Available while Sine Wave Test”));
} else {
Serial.print(F(“Memory Test Results = “));
Serial.println(teststate, HEX);
Serial.println(F(“Result should be 0x83FF.”));
Serial.println(F(“Reset is needed to recover to normal operation”));
}

} else if(key_command == ‘e’) {
uint8_t earspeaker = MP3player.getEarSpeaker();
if(earspeaker >= 3){
earspeaker = 0;
} else {
earspeaker++;
}
MP3player.setEarSpeaker(earspeaker); // commit new earspeaker
Serial.print(F(“earspeaker to “));
Serial.println(earspeaker, DEC);

} else if(key_command == ‘r’) {
MP3player.resumeMusic(2000);

} else if(key_command == ‘R’) {
MP3player.stopTrack();
MP3player.vs_init();
Serial.println(F(“Reseting VS10xx chip”));

} else if(key_command == ‘g’) {
int32_t offset_ms = 20000; // Note this is just an example, try your own number.
Serial.print(F(“jumping to “));
Serial.print(offset_ms, DEC);
Serial.println(F(“[milliseconds]”));
result = MP3player.skipTo(offset_ms);
if(result != 0) {
Serial.print(F(“Error code: “));
Serial.print(result);
Serial.println(F(” when trying to skip track”));
}

} else if(key_command == ‘k’) {
int32_t offset_ms = -1000; // Note this is just an example, try your own number.
Serial.print(F(“moving = “));
Serial.print(offset_ms, DEC);
Serial.println(F(“[milliseconds]”));
result = MP3player.skip(offset_ms);
if(result != 0) {
Serial.print(F(“Error code: “));
Serial.print(result);
Serial.println(F(” when trying to skip track”));
}

} else if(key_command == ‘O’) {
MP3player.end();
Serial.println(F(“VS10xx placed into low power reset mode.”));

} else if(key_command == ‘o’) {
MP3player.begin();
Serial.println(F(“VS10xx restored from low power reset mode.”));

} else if(key_command == ‘D’) {
uint16_t diff_state = MP3player.getDifferentialOutput();
Serial.print(F(“Differential Mode “));
if(diff_state == 0) {
MP3player.setDifferentialOutput(1);
Serial.println(F(“Enabled.”));
} else {
MP3player.setDifferentialOutput(0);
Serial.println(F(“Disabled.”));
}

} else if(key_command == ‘V’) {
MP3player.setVUmeter(1);
Serial.println(F(“Use \”No line ending\””));
Serial.print(F(“VU meter = “));
Serial.println(MP3player.getVUmeter());
Serial.println(F(“Hit Any key to stop.”));

while(!Serial.available()) {
union twobyte vu;
vu.word = MP3player.getVUlevel();
Serial.print(F(“VU: L = “));
Serial.print(vu.byte[1]);
Serial.print(F(” / R = “));
Serial.print(vu.byte[0]);
Serial.println(” dB”);
delay(1000);
}
Serial.read();

MP3player.setVUmeter(0);
Serial.print(F(“VU meter = “));
Serial.println(MP3player.getVUmeter());

} else if(key_command == ‘T’) {
uint16_t TrebleFrequency = MP3player.getTrebleFrequency();
Serial.print(F(“Former TrebleFrequency = “));
Serial.println(TrebleFrequency, DEC);
if (TrebleFrequency >= 15000) { // Range is from 0 – 1500Hz
TrebleFrequency = 0;
} else {
TrebleFrequency += 1000;
}
MP3player.setTrebleFrequency(TrebleFrequency);
Serial.print(F(“New TrebleFrequency = “));
Serial.println(MP3player.getTrebleFrequency(), DEC);

} else if(key_command == ‘E’) {
int8_t TrebleAmplitude = MP3player.getTrebleAmplitude();
Serial.print(F(“Former TrebleAmplitude = “));
Serial.println(TrebleAmplitude, DEC);
if (TrebleAmplitude >= 7) { // Range is from -8 – 7dB
TrebleAmplitude = -8;
} else {
TrebleAmplitude++;
}
MP3player.setTrebleAmplitude(TrebleAmplitude);
Serial.print(F(“New TrebleAmplitude = “));
Serial.println(MP3player.getTrebleAmplitude(), DEC);

} else if(key_command == ‘B’) {
uint16_t BassFrequency = MP3player.getBassFrequency();
Serial.print(F(“Former BassFrequency = “));
Serial.println(BassFrequency, DEC);
if (BassFrequency >= 150) { // Range is from 20hz – 150hz
BassFrequency = 0;
} else {
BassFrequency += 10;
}
MP3player.setBassFrequency(BassFrequency);
Serial.print(F(“New BassFrequency = “));
Serial.println(MP3player.getBassFrequency(), DEC);

} else if(key_command == ‘C’) {
uint16_t BassAmplitude = MP3player.getBassAmplitude();
Serial.print(F(“Former BassAmplitude = “));
Serial.println(BassAmplitude, DEC);
if (BassAmplitude >= 15) { // Range is from 0 – 15dB
BassAmplitude = 0;
} else {
BassAmplitude++;
}
MP3player.setBassAmplitude(BassAmplitude);
Serial.print(F(“New BassAmplitude = “));
Serial.println(MP3player.getBassAmplitude(), DEC);

} else if(key_command == ‘M’) {
uint16_t monostate = MP3player.getMonoMode();
Serial.print(F(“Mono Mode “));
if(monostate == 0) {
MP3player.setMonoMode(1);
Serial.println(F(“Enabled.”));
} else {
MP3player.setMonoMode(0);
Serial.println(F(“Disabled.”));
}
#endif

} else if(key_command == ‘l’) {
if(!MP3player.isPlaying()) {
Serial.println(F(“Music Files found :”));
SdFile file;
char filename[13];
sd.chdir(“/”,true);
uint16_t count = 1;
while (file.openNext(sd.vwd(),O_READ))
{
file.getName(filename, sizeof(filename));
if ( isFnMusic(filename) ) {
SerialPrintPaddedNumber(count, 5 );
Serial.print(F(“: “));
Serial.println(filename);
count++;
}
file.close();
}
Serial.println(F(“Enter Index of File to play”));

} else {
Serial.println(F(“Busy Playing Files, try again later.”));
}

} else if(key_command == ‘h’) {
help();
}

// print prompt after key stroke has been processed.
Serial.print(F(“Time since last command: “));
Serial.println((float) (millis() – millis_prv)/1000, 2);
millis_prv = millis();
Serial.print(F(“Enter s,1-9,+,-,>,<,f,F,d,i,p,t,S,b”));
#if !defined(__AVR_ATmega32U4__)
Serial.print(F(“,m,e,r,R,g,k,O,o,D,V,B,C,T,E,M:”));
#endif
Serial.println(F(“,l,h :”));
}
void help() {
Serial.println(F(“Arduino SFEMP3Shield Library Example:”));
Serial.println(F(” courtesy of Bill Porter & Michael P. Flaga”));
Serial.println(F(“COMMANDS:”));
Serial.println(F(” [1-9] to play a track”));
Serial.println(F(” [f] play track001.mp3 by filename example”));
Serial.println(F(” [F] same as [f] but with initial skip of 2 second”));
Serial.println(F(” [s] to stop playing”));
Serial.println(F(” [d] display directory of SdCard”));
Serial.println(F(” [+ or -] to change volume”));
Serial.println(F(” [> or <] to increment or decrement play speed by 1 factor”));
Serial.println(F(” [i] retrieve current audio information (partial list)”));
Serial.println(F(” [p] to pause.”));
Serial.println(F(” [t] to toggle sine wave test”));
Serial.println(F(” [S] Show State of Device.”));
Serial.println(F(” [b] Play a MIDI File Beep”));
#if !defined(__AVR_ATmega32U4__)
Serial.println(F(” [e] increment Spatial EarSpeaker, default is 0, wraps after 4″));
Serial.println(F(” [m] perform memory test. reset is needed after to recover.”));
Serial.println(F(” [M] Toggle between Mono and Stereo Output.”));
Serial.println(F(” [g] Skip to a predetermined offset of ms in current track.”));
Serial.println(F(” [k] Skip a predetermined number of ms in current track.”));
Serial.println(F(”

[r] resumes play from 2s from begin of file”));
Serial.println(F(” [R] Resets and initializes VS10xx chip.”));
Serial.println(F(” [O] turns OFF the VS10xx into low power reset.”));
Serial.println(F(” [o] turns ON the VS10xx out of low power reset.”));
Serial.println(F(” [D] to toggle SM_DIFF between inphase and differential output”));
Serial.println(F(” [V] Enable VU meter Test.”));
Serial.println(F(” [B] Increament bass frequency by 10Hz”));
Serial.println(F(” [C] Increament bass amplitude by 1dB”));
Serial.println(F(” [T] Increament treble frequency by 1000Hz”));
Serial.println(F(” [E] Increament treble amplitude by 1dB”));
#endif
Serial.println(F(” [l] Display list of music files”));
Serial.println(F(” [0####] Enter index of file to play, zero pad! e.g. 01-65534″));
Serial.println(F(” [h] this help”));
}

void SerialPrintPaddedNumber(int16_t value, int8_t digits ) {
int currentMax = 10;
for (byte i=1; i<digits; i++){
if (value < currentMax) {
Serial.print(“0”);
}
currentMax *= 10;
}
Serial.print(value);
}