update Case

* Fix the bug that read cannot get the right result.
* Add USB support
* Add more example.

.travis.yml

@@ -0,0 +1,17 @@
+language: python
+python:
+    - "2.7"
+env:
+    - BOARD=uno
+    - BOARD=leonardo
+    - BOARD=esp01
+
+install:
+    - python -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio/master/scripts/get-platformio.py)"
+
+script:
+    - cd examples/FullFunction
+    - platformio ci -l ../.. FullFunction.ino --board=$BOARD
+    - cd ../GetStarted
+    - platformio ci -l ../.. getStarted.ino --board=$BOARD
+

DFRobotDFPlayerMini.cpp

@@ -7,7 +7,7 @@
  * @copyright	GNU Lesser General Public License
  *
  * @author [Angelo](Angelo.qiao@dfrobot.com)
- * @version  V1.0
+ * @version  V1.0.3
  * @date  2016-12-07
  */
 
@@ -24,21 +24,19 @@ void DFRobotDFPlayerMini::uint16ToArray(uint16_t value, uint8_t *array){
 
 uint16_t DFRobotDFPlayerMini::calculateCheckSum(uint8_t *buffer){
   uint16_t sum = 0;
-  for (int i=Stack::Version; i<Stack::CheckSum; i++) {
+  for (int i=Stack_Version; i<Stack_CheckSum; i++) {
     sum += buffer[i];
   }
   return -sum;
 }
 
 void DFRobotDFPlayerMini::sendStack(){
-  if (_sending[Stack::ACK]) {
+  if (_sending[Stack_ACK]) {  //if the ack mode is on wait until the last transmition
     while (_isSending) {
+      delay(0);
       available();
     }
   }
-  else{
-    delay(10);
-  }
 
 #ifdef _DEBUG
   Serial.println();
@@ -51,7 +49,11 @@ void DFRobotDFPlayerMini::sendStack(){
 #endif
   _serial->write(_sending, DFPLAYER_SEND_LENGTH);
   _timeOutTimer = millis();
-  _isSending = _sending[Stack::ACK];
+  _isSending = _sending[Stack_ACK];
+  
+  if (!_sending[Stack_ACK]) { //if the ack mode is off wait 10 ms after one transmition.
+    delay(10);
+  }
 }
 
 void DFRobotDFPlayerMini::sendStack(uint8_t command){
@@ -59,9 +61,9 @@ void DFRobotDFPlayerMini::sendStack(uint8_t command){
 }
 
 void DFRobotDFPlayerMini::sendStack(uint8_t command, uint16_t argument){
-  _sending[Stack::Command] = command;
+  _sending[Stack_Command] = command;
-  uint16ToArray(argument, _sending+Stack::Parameter);
+  uint16ToArray(argument, _sending+Stack_Parameter);
-  uint16ToArray(calculateCheckSum(_sending), _sending+Stack::CheckSum);
+  uint16ToArray(calculateCheckSum(_sending), _sending+Stack_CheckSum);
   sendStack();
 }
 
@@ -72,20 +74,30 @@ void DFRobotDFPlayerMini::sendStack(uint8_t command, uint8_t argumentHigh, uint8
 }
 
 void DFRobotDFPlayerMini::enableACK(){
-  _sending[Stack::ACK] = 0x01;
+  _sending[Stack_ACK] = 0x01;
 }
 
 void DFRobotDFPlayerMini::disableACK(){
-  _sending[Stack::ACK] = 0x00;
+  _sending[Stack_ACK] = 0x00;
 }
 
-bool DFRobotDFPlayerMini::waitAvailable(){
+bool DFRobotDFPlayerMini::waitAvailable(unsigned long duration){
-  _isSending = true;
+  unsigned long timer = millis();
-  while (!available());
+  if (!duration) {
-  return _handleType != HandleType::TimeOut;
+    duration = _timeOutDuration;
+  }
+  while (!available()){
+    if (millis() - timer > duration) {
+      return false;
+    }
+    delay(0);
+  }
+  return true;
 }
 
-bool DFRobotDFPlayerMini::begin(Stream &stream, bool isACK){
+bool DFRobotDFPlayerMini::begin(Stream &stream, bool isACK, bool doReset){
+  _serial = &stream;
+  
   if (isACK) {
     enableACK();
   }
@@ -93,16 +105,20 @@ bool DFRobotDFPlayerMini::begin(Stream &stream, bool isACK){
     disableACK();
   }
   
-  _serial = &stream;
+  if (doReset) {
-  _timeOutDuration += 3000;
+    reset();
-  reset();
+    waitAvailable(2000);
-  waitAvailable();
+    delay(200);
-  _timeOutDuration -= 3000;
+  }
-  delay(200);
+  else {
-  return (readType() == DFPlayerCardOnline) || !isACK;
+    // assume same state as with reset(): online
+    _handleType = DFPlayerCardOnline;
+  }
+
+  return (readType() == DFPlayerCardOnline) || (readType() == DFPlayerUSBOnline) || !isACK;
 }
 
-HandleType DFRobotDFPlayerMini::readType(){
+uint8_t DFRobotDFPlayerMini::readType(){
   _isAvailable = false;
   return _handleType;
 }
@@ -112,7 +128,7 @@ uint16_t DFRobotDFPlayerMini::read(){
   return _handleParameter;
 }
 
-bool DFRobotDFPlayerMini::handleMessage(HandleType type, uint16_t parameter){
+bool DFRobotDFPlayerMini::handleMessage(uint8_t type, uint16_t parameter){
   _receivedIndex = 0;
   _handleType = type;
   _handleParameter = parameter;
@@ -120,9 +136,10 @@ bool DFRobotDFPlayerMini::handleMessage(HandleType type, uint16_t parameter){
   return _isAvailable;
 }
 
-bool DFRobotDFPlayerMini::handleError(HandleType type, uint16_t parameter){
+bool DFRobotDFPlayerMini::handleError(uint8_t type, uint16_t parameter){
   handleMessage(type, parameter);
   _isSending = false;
+  return false;
 }
 
 uint8_t DFRobotDFPlayerMini::readCommand(){
@@ -131,33 +148,48 @@ uint8_t DFRobotDFPlayerMini::readCommand(){
 }
 
 void DFRobotDFPlayerMini::parseStack(){
-  _handleCommand = *(_received + Stack::Command);
+  uint8_t handleCommand = *(_received + Stack_Command);
-  _handleParameter =  arrayToUint16(_received + Stack::Parameter);
+  if (handleCommand == 0x41) { //handle the 0x41 ack feedback as a spcecial case, in case the pollusion of _handleCommand, _handleParameter, and _handleType.
+    _isSending = false;
+    return;
+  }
+  
+  _handleCommand = handleCommand;
+  _handleParameter =  arrayToUint16(_received + Stack_Parameter);
 
   switch (_handleCommand) {
     case 0x3D:
-      handleMessage(HandleType::DFPlayerPlayFinished, _handleParameter);
+      handleMessage(DFPlayerPlayFinished, _handleParameter);
       break;
     case 0x3F:
-      if (_handleParameter & 0x02) {
+      if (_handleParameter & 0x01) {
-        handleMessage(HandleType::DFPlayerCardOnline, _handleParameter);
+        handleMessage(DFPlayerUSBOnline, _handleParameter);
+      }
+      else if (_handleParameter & 0x02) {
+        handleMessage(DFPlayerCardOnline, _handleParameter);
+      }
+      else if (_handleParameter & 0x03) {
+        handleMessage(DFPlayerCardUSBOnline, _handleParameter);
       }
       break;
     case 0x3A:
-      if (_handleParameter & 0x02) {
+      if (_handleParameter & 0x01) {
-        handleMessage(HandleType::DFPlayerCardInserted, _handleParameter);
+        handleMessage(DFPlayerUSBInserted, _handleParameter);
+      }
+      else if (_handleParameter & 0x02) {
+        handleMessage(DFPlayerCardInserted, _handleParameter);
       }
       break;
     case 0x3B:
-      if (_handleParameter & 0x02) {
+      if (_handleParameter & 0x01) {
-        handleMessage(HandleType::DFPlayerCardRemoved, _handleParameter);
+        handleMessage(DFPlayerUSBRemoved, _handleParameter);
+      }
+      else if (_handleParameter & 0x02) {
+        handleMessage(DFPlayerCardRemoved, _handleParameter);
       }
       break;
     case 0x40:
-      handleMessage(HandleType::DFPlayerError, _handleParameter);
+      handleMessage(DFPlayerError, _handleParameter);
-      break;
-    case 0x41:
-      _isSending = false;
       break;
     case 0x3C:
     case 0x3E:
@@ -174,7 +206,7 @@ void DFRobotDFPlayerMini::parseStack(){
     case 0x4D:
     case 0x4E:
     case 0x4F:
-      _isAvailable = true;
+      handleMessage(DFPlayerFeedBack, _handleParameter);
       break;
     default:
       handleError(WrongStack);
@@ -190,20 +222,20 @@ uint16_t DFRobotDFPlayerMini::arrayToUint16(uint8_t *array){
 }
 
 bool DFRobotDFPlayerMini::validateStack(){
-  return calculateCheckSum(_received) == arrayToUint16(_received+Stack::CheckSum);
+  return calculateCheckSum(_received) == arrayToUint16(_received+Stack_CheckSum);
 }
 
 bool DFRobotDFPlayerMini::available(){
   while (_serial->available()) {
+    delay(0);
     if (_receivedIndex == 0) {
-      _received[Stack::Header] = _serial->read();
+      _received[Stack_Header] = _serial->read();
 #ifdef _DEBUG
       Serial.print(F("received:"));
       Serial.print(_received[_receivedIndex],HEX);
       Serial.print(F(" "));
 #endif
-      if (_received[Stack::Header] == 0x7E) {
+      if (_received[Stack_Header] == 0x7E) {
-        _isAvailable = false;
         _receivedIndex ++;
       }
     }
@@ -214,17 +246,17 @@ bool DFRobotDFPlayerMini::available(){
       Serial.print(F(" "));
 #endif
       switch (_receivedIndex) {
-        case Stack::Version:
+        case Stack_Version:
           if (_received[_receivedIndex] != 0xFF) {
             return handleError(WrongStack);
           }
           break;
-        case Stack::Length:
+        case Stack_Length:
           if (_received[_receivedIndex] != 0x06) {
             return handleError(WrongStack);
           }
           break;
-        case Stack::End:
+        case Stack_End:
 #ifdef _DEBUG
           Serial.println();
 #endif
@@ -235,9 +267,6 @@ bool DFRobotDFPlayerMini::available(){
             if (validateStack()) {
               _receivedIndex = 0;
               parseStack();
-              if (_isAvailable && !_sending[Stack::ACK]) {
-                _isSending = false;
-              }
               return _isAvailable;
             }
             else{
@@ -375,7 +404,12 @@ void DFRobotDFPlayerMini::disableDAC(){
 int DFRobotDFPlayerMini::readState(){
   sendStack(0x42);
   if (waitAvailable()) {
-    return read();
+    if (readType() == DFPlayerFeedBack) {
+      return read();
+    }
+    else{
+      return -1;
+    }
   }
   else{
     return -1;
@@ -392,11 +426,15 @@ int DFRobotDFPlayerMini::readVolume(){
   }
 }
 
-uint8_t DFRobotDFPlayerMini::readEQ(){
+int DFRobotDFPlayerMini::readEQ(){
   sendStack(0x44);
-  while (!available());
   if (waitAvailable()) {
-    return read();
+    if (readType() == DFPlayerFeedBack) {
+      return read();
+    }
+    else{
+      return -1;
+    }
   }
   else{
     return -1;
@@ -419,7 +457,12 @@ int DFRobotDFPlayerMini::readFileCounts(uint8_t device){
   }
   
   if (waitAvailable()) {
-    return read();
+    if (readType() == DFPlayerFeedBack) {
+      return read();
+    }
+    else{
+      return -1;
+    }
   }
   else{
     return -1;
@@ -441,7 +484,12 @@ int DFRobotDFPlayerMini::readCurrentFileNumber(uint8_t device){
       break;
   }
   if (waitAvailable()) {
-    return read();
+    if (readType() == DFPlayerFeedBack) {
+      return read();
+    }
+    else{
+      return -1;
+    }
   }
   else{
     return -1;
@@ -451,7 +499,27 @@ int DFRobotDFPlayerMini::readCurrentFileNumber(uint8_t device){
 int DFRobotDFPlayerMini::readFileCountsInFolder(int folderNumber){
   sendStack(0x4E, folderNumber);
   if (waitAvailable()) {
-    return read();
+    if (readType() == DFPlayerFeedBack) {
+      return read();
+    }
+    else{
+      return -1;
+    }
+  }
+  else{
+    return -1;
+  }
+}
+
+int DFRobotDFPlayerMini::readFolderCounts(){
+  sendStack(0x4F);
+  if (waitAvailable()) {
+    if (readType() == DFPlayerFeedBack) {
+      return read();
+    }
+    else{
+      return -1;
+    }
   }
   else{
     return -1;
@@ -459,11 +527,11 @@ int DFRobotDFPlayerMini::readFileCountsInFolder(int folderNumber){
 }
 
 int DFRobotDFPlayerMini::readFileCounts(){
-  readFileCounts(DFPLAYER_DEVICE_SD);
+  return readFileCounts(DFPLAYER_DEVICE_SD);
 }
 
 int DFRobotDFPlayerMini::readCurrentFileNumber(){
-  readCurrentFileNumber(DFPLAYER_DEVICE_SD);
+  return readCurrentFileNumber(DFPLAYER_DEVICE_SD);
 }
 
 

DFRobotDFPlayerMini.h

@@ -7,7 +7,7 @@
  * @copyright	GNU Lesser General Public License
  *
  * @author [Angelo](Angelo.qiao@dfrobot.com)
- * @version  V1.0
+ * @version  V1.0.3
  * @date  2016-12-07
  */
 
@@ -35,26 +35,35 @@
 
 //#define _DEBUG
 
-enum HandleType{
+#define TimeOut 0
-  TimeOut,
+#define WrongStack 1
-  WrongStack,
+#define DFPlayerCardInserted 2
-  DFPlayerCardInserted,
+#define DFPlayerCardRemoved 3
-  DFPlayerCardRemoved,
+#define DFPlayerCardOnline 4
-  DFPlayerCardOnline,
+#define DFPlayerPlayFinished 5
-  DFPlayerPlayFinished,
+#define DFPlayerError 6
-  DFPlayerError
+#define DFPlayerUSBInserted 7
-};
+#define DFPlayerUSBRemoved 8
+#define DFPlayerUSBOnline 9
+#define DFPlayerCardUSBOnline 10
+#define DFPlayerFeedBack 11
 
-enum DFPlayerErrorType{
+#define Busy 1
-  Busy = 1,
+#define Sleeping 2
-  Sleeping,
+#define SerialWrongStack 3
-  SerialWrongStack,
+#define CheckSumNotMatch 4
-  CheckSumNotMatch,
+#define FileIndexOut 5
-  FileIndexOut,
+#define FileMismatch 6
-  FileMismatch,
+#define Advertise 7
-  Advertise
-};
 
+#define Stack_Header 0
+#define Stack_Version 1
+#define Stack_Length 2
+#define Stack_Command 3
+#define Stack_ACK 4
+#define Stack_Parameter 5
+#define Stack_CheckSum 7
+#define Stack_End 9
 
 class DFRobotDFPlayerMini {
   Stream* _serial;
@@ -88,38 +97,26 @@ class DFRobotDFPlayerMini {
   
   uint8_t device = DFPLAYER_DEVICE_SD;
   
-  
-  enum Stack{
-    Header = 0,
-    Version = 1,
-    Length = 2,
-    Command = 3,
-    ACK = 4,
-    Parameter = 5,
-    CheckSum = 7,
-    End = 9
-  };
-  
   public:
   
-  HandleType _handleType;
+  uint8_t _handleType;
   uint8_t _handleCommand;
   uint16_t _handleParameter;
   bool _isAvailable = false;
   bool _isSending = false;
   
-  bool handleMessage(HandleType type, uint16_t parameter = 0);
+  bool handleMessage(uint8_t type, uint16_t parameter = 0);
-  bool handleError(HandleType type, uint16_t parameter = 0);
+  bool handleError(uint8_t type, uint16_t parameter = 0);
 
   uint8_t readCommand();
   
-  bool begin(Stream& stream, bool isACK = true);
+  bool begin(Stream& stream, bool isACK = true, bool doReset = true);
   
-  bool waitAvailable();
+  bool waitAvailable(unsigned long duration = 0);
   
   bool available();
   
-  HandleType readType();
+  uint8_t readType();
   
   uint16_t read();
   
@@ -185,7 +182,7 @@ class DFRobotDFPlayerMini {
   
   int readVolume();
   
-  uint8_t readEQ();
+  int readEQ();
   
   int readFileCounts(uint8_t device);
   
@@ -194,6 +191,8 @@ class DFRobotDFPlayerMini {
   int readFileCountsInFolder(int folderNumber);
   
   int readFileCounts();
+
+  int readFolderCounts();
   
   int readCurrentFileNumber();
   

README.md

@@ -1,6 +1,7 @@
 # DFPlayer - A Mini MP3 Player For Arduino
-DFPlayer - A Mini MP3 Player For Arduino
 
+
+DFPlayer - A Mini MP3 Player For Arduino
 https://www.dfrobot.com/index.php?route=product/product&product_id=1121
 
 This example shows the all the function of library for DFPlayer.
@@ -16,5 +17,4 @@ Notice and Trouble shooting
 
 1.Connection and Diagram can be found here
 https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram
-
+2.This code is tested on Arduino Uno, Leonardo, Mega boards.
-2.This code is tested on Arduino Uno, Leonardo, Mega boards.

examples/AdvancedSettingViaSerial1/AdvancedSettingViaSerial1.ino

@@ -0,0 +1,126 @@
+/***************************************************
+DFPlayer - A Mini MP3 Player For Arduino
+ <https://www.dfrobot.com/product-1121.html>
+ 
+ ***************************************************
+ This example shows the basic function of library for DFPlayer.
+ 
+ Created 2016-12-07
+ By [Angelo qiao](Angelo.qiao@dfrobot.com)
+ 
+ GNU Lesser General Public License.
+ See <http://www.gnu.org/licenses/> for details.
+ All above must be included in any redistribution
+ ****************************************************/
+
+/***********Notice and Trouble shooting***************
+ 1.Connection and Diagram can be found here
+ <https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
+ 2.This code is tested on Arduino Uno, Leonardo, Mega boards.
+ ****************************************************/
+
+#include "Arduino.h"
+#include "DFRobotDFPlayerMini.h"
+
+DFRobotDFPlayerMini myDFPlayer;
+void printDetail(uint8_t type, int value);
+
+void setup()
+{
+  Serial1.begin(9600);
+  Serial.begin(115200);
+  
+  Serial.println();
+  Serial.println(F("DFRobot DFPlayer Mini Demo"));
+  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
+  
+  if (!myDFPlayer.begin(Serial1)) {  //Use softwareSerial to communicate with mp3.
+    Serial.println(F("Unable to begin:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card!"));
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
+  }
+  Serial.println(F("DFPlayer Mini online."));
+  
+  myDFPlayer.volume(10);  //Set volume value. From 0 to 30
+  myDFPlayer.play(1);  //Play the first mp3
+}
+
+void loop()
+{
+  static unsigned long timer = millis();
+  
+  if (millis() - timer > 3000) {
+    timer = millis();
+    myDFPlayer.next();  //Play next mp3 every 3 second.
+  }
+  
+  if (myDFPlayer.available()) {
+    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
+  }
+}
+
+void printDetail(uint8_t type, int value){
+  switch (type) {
+    case TimeOut:
+      Serial.println(F("Time Out!"));
+      break;
+    case WrongStack:
+      Serial.println(F("Stack Wrong!"));
+      break;
+    case DFPlayerCardInserted:
+      Serial.println(F("Card Inserted!"));
+      break;
+    case DFPlayerCardRemoved:
+      Serial.println(F("Card Removed!"));
+      break;
+    case DFPlayerCardOnline:
+      Serial.println(F("Card Online!"));
+      break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
+    case DFPlayerPlayFinished:
+      Serial.print(F("Number:"));
+      Serial.print(value);
+      Serial.println(F(" Play Finished!"));
+      break;
+    case DFPlayerError:
+      Serial.print(F("DFPlayerError:"));
+      switch (value) {
+        case Busy:
+          Serial.println(F("Card not found"));
+          break;
+        case Sleeping:
+          Serial.println(F("Sleeping"));
+          break;
+        case SerialWrongStack:
+          Serial.println(F("Get Wrong Stack"));
+          break;
+        case CheckSumNotMatch:
+          Serial.println(F("Check Sum Not Match"));
+          break;
+        case FileIndexOut:
+          Serial.println(F("File Index Out of Bound"));
+          break;
+        case FileMismatch:
+          Serial.println(F("Cannot Find File"));
+          break;
+        case Advertise:
+          Serial.println(F("In Advertise"));
+          break;
+        default:
+          break;
+      }
+      break;
+    default:
+      break;
+  }
+  
+}
+

examples/AdvancedSettingWithoutACK/AdvancedSettingWithoutACK.ino

@@ -0,0 +1,128 @@
+/***************************************************
+DFPlayer - A Mini MP3 Player For Arduino
+ <https://www.dfrobot.com/product-1121.html>
+ 
+ ***************************************************
+ This example shows the basic function of library for DFPlayer.
+ 
+ Created 2016-12-07
+ By [Angelo qiao](Angelo.qiao@dfrobot.com)
+ 
+ GNU Lesser General Public License.
+ See <http://www.gnu.org/licenses/> for details.
+ All above must be included in any redistribution
+ ****************************************************/
+
+/***********Notice and Trouble shooting***************
+ 1.Connection and Diagram can be found here
+ <https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
+ 2.This code is tested on Arduino Uno, Leonardo, Mega boards.
+ ****************************************************/
+
+#include "Arduino.h"
+#include "SoftwareSerial.h"
+#include "DFRobotDFPlayerMini.h"
+
+SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
+DFRobotDFPlayerMini myDFPlayer;
+void printDetail(uint8_t type, int value);
+
+void setup()
+{
+  mySoftwareSerial.begin(9600);
+  Serial.begin(115200);
+  
+  Serial.println();
+  Serial.println(F("DFRobot DFPlayer Mini Demo"));
+  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
+  
+  if (!myDFPlayer.begin(mySoftwareSerial, false)) {  //Use softwareSerial to communicate with mp3.
+    Serial.println(F("Unable to begin:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card!"));
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
+  }
+  Serial.println(F("DFPlayer Mini online."));
+  
+  myDFPlayer.volume(10);  //Set volume value. From 0 to 30
+  myDFPlayer.play(1);  //Play the first mp3
+}
+
+void loop()
+{
+  static unsigned long timer = millis();
+  
+  if (millis() - timer > 3000) {
+    timer = millis();
+    myDFPlayer.next();  //Play next mp3 every 3 second.
+  }
+  
+  if (myDFPlayer.available()) {
+    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
+  }
+}
+
+void printDetail(uint8_t type, int value){
+  switch (type) {
+    case TimeOut:
+      Serial.println(F("Time Out!"));
+      break;
+    case WrongStack:
+      Serial.println(F("Stack Wrong!"));
+      break;
+    case DFPlayerCardInserted:
+      Serial.println(F("Card Inserted!"));
+      break;
+    case DFPlayerCardRemoved:
+      Serial.println(F("Card Removed!"));
+      break;
+    case DFPlayerCardOnline:
+      Serial.println(F("Card Online!"));
+      break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
+    case DFPlayerPlayFinished:
+      Serial.print(F("Number:"));
+      Serial.print(value);
+      Serial.println(F(" Play Finished!"));
+      break;
+    case DFPlayerError:
+      Serial.print(F("DFPlayerError:"));
+      switch (value) {
+        case Busy:
+          Serial.println(F("Card not found"));
+          break;
+        case Sleeping:
+          Serial.println(F("Sleeping"));
+          break;
+        case SerialWrongStack:
+          Serial.println(F("Get Wrong Stack"));
+          break;
+        case CheckSumNotMatch:
+          Serial.println(F("Check Sum Not Match"));
+          break;
+        case FileIndexOut:
+          Serial.println(F("File Index Out of Bound"));
+          break;
+        case FileMismatch:
+          Serial.println(F("Cannot Find File"));
+          break;
+        case Advertise:
+          Serial.println(F("In Advertise"));
+          break;
+        default:
+          break;
+      }
+      break;
+    default:
+      break;
+  }
+  
+}
+

examples/AdvancedSettingWithoutReset/AdvancedSettingWithoutReset.ino

@@ -0,0 +1,128 @@
+/***************************************************
+DFPlayer - A Mini MP3 Player For Arduino
+ <https://www.dfrobot.com/product-1121.html>
+ 
+ ***************************************************
+ This example shows the basic function of library for DFPlayer.
+ 
+ Created 2016-12-07
+ By [Angelo qiao](Angelo.qiao@dfrobot.com)
+ 
+ GNU Lesser General Public License.
+ See <http://www.gnu.org/licenses/> for details.
+ All above must be included in any redistribution
+ ****************************************************/
+
+/***********Notice and Trouble shooting***************
+ 1.Connection and Diagram can be found here
+ <https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
+ 2.This code is tested on Arduino Uno, Leonardo, Mega boards.
+ ****************************************************/
+
+#include "Arduino.h"
+#include "SoftwareSerial.h"
+#include "DFRobotDFPlayerMini.h"
+
+SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
+DFRobotDFPlayerMini myDFPlayer;
+void printDetail(uint8_t type, int value);
+
+void setup()
+{
+  mySoftwareSerial.begin(9600);
+  Serial.begin(115200);
+  
+  Serial.println();
+  Serial.println(F("DFRobot DFPlayer Mini Demo"));
+  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
+  
+  if (!myDFPlayer.begin(mySoftwareSerial, true, false)) {  //Use softwareSerial to communicate with mp3.
+    Serial.println(F("Unable to begin:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card!"));
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
+  }
+  Serial.println(F("DFPlayer Mini online."));
+  
+  myDFPlayer.volume(10);  //Set volume value. From 0 to 30
+  myDFPlayer.play(1);  //Play the first mp3
+}
+
+void loop()
+{
+  static unsigned long timer = millis();
+  
+  if (millis() - timer > 3000) {
+    timer = millis();
+    myDFPlayer.next();  //Play next mp3 every 3 second.
+  }
+  
+  if (myDFPlayer.available()) {
+    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
+  }
+}
+
+void printDetail(uint8_t type, int value){
+  switch (type) {
+    case TimeOut:
+      Serial.println(F("Time Out!"));
+      break;
+    case WrongStack:
+      Serial.println(F("Stack Wrong!"));
+      break;
+    case DFPlayerCardInserted:
+      Serial.println(F("Card Inserted!"));
+      break;
+    case DFPlayerCardRemoved:
+      Serial.println(F("Card Removed!"));
+      break;
+    case DFPlayerCardOnline:
+      Serial.println(F("Card Online!"));
+      break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
+    case DFPlayerPlayFinished:
+      Serial.print(F("Number:"));
+      Serial.print(value);
+      Serial.println(F(" Play Finished!"));
+      break;
+    case DFPlayerError:
+      Serial.print(F("DFPlayerError:"));
+      switch (value) {
+        case Busy:
+          Serial.println(F("Card not found"));
+          break;
+        case Sleeping:
+          Serial.println(F("Sleeping"));
+          break;
+        case SerialWrongStack:
+          Serial.println(F("Get Wrong Stack"));
+          break;
+        case CheckSumNotMatch:
+          Serial.println(F("Check Sum Not Match"));
+          break;
+        case FileIndexOut:
+          Serial.println(F("File Index Out of Bound"));
+          break;
+        case FileMismatch:
+          Serial.println(F("Cannot Find File"));
+          break;
+        case Advertise:
+          Serial.println(F("In Advertise"));
+          break;
+        default:
+          break;
+      }
+      break;
+    default:
+      break;
+  }
+  
+}
+

examples/FullFunction/FullFunction.ino

@@ -1,6 +1,6 @@
 /***************************************************
  DFPlayer - A Mini MP3 Player For Arduino
- <https://www.dfrobot.com/index.php?route=product/product&product_id=1121>
+ <https://www.dfrobot.com/product-1121.html>
  
  ***************************************************
  This example shows the all the function of library for DFPlayer.
@@ -115,7 +115,7 @@ void setup()
   Serial.println(myDFPlayer.readEQ()); //read EQ setting
   Serial.println(myDFPlayer.readFileCounts()); //read all file counts in SD card
   Serial.println(myDFPlayer.readCurrentFileNumber()); //read current play file number
-  Serial.println(myDFPlayer.readFileCountsInFolder(3)); //read fill counts in folder SD:/03
+  Serial.println(myDFPlayer.readFileCountsInFolder(3)); //read file counts in folder SD:/03
 }
 
 void loop()
@@ -149,6 +149,12 @@ void printDetail(uint8_t type, int value){
     case DFPlayerCardOnline:
       Serial.println(F("Card Online!"));
       break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
     case DFPlayerPlayFinished:
       Serial.print(F("Number:"));
       Serial.print(value);
@@ -185,4 +191,6 @@ void printDetail(uint8_t type, int value){
     default:
       break;
   }
+  
 }
+

examples/GetStarted/GetStarted.ino

@@ -1,6 +1,6 @@
 /***************************************************
 DFPlayer - A Mini MP3 Player For Arduino
- <https://www.dfrobot.com/index.php?route=product/product&product_id=1121>
+ <https://www.dfrobot.com/product-1121.html>
  
  ***************************************************
  This example shows the basic function of library for DFPlayer.
@@ -40,7 +40,9 @@ void setup()
     Serial.println(F("Unable to begin:"));
     Serial.println(F("1.Please recheck the connection!"));
     Serial.println(F("2.Please insert the SD card!"));
-    while(true);
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
   }
   Serial.println(F("DFPlayer Mini online."));
   
@@ -79,6 +81,12 @@ void printDetail(uint8_t type, int value){
     case DFPlayerCardOnline:
       Serial.println(F("Card Online!"));
       break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
     case DFPlayerPlayFinished:
       Serial.print(F("Number:"));
       Serial.print(value);
@@ -115,5 +123,5 @@ void printDetail(uint8_t type, int value){
     default:
       break;
   }
-
+  
 }

examples/ReadValues/ReadValues.ino

@@ -0,0 +1,140 @@
+/***************************************************
+ DFPlayer - A Mini MP3 Player For Arduino
+ <https://www.dfrobot.com/product-1121.html>
+ 
+ ***************************************************
+ This example shows the basic function of library for DFPlayer.
+ 
+ Created 2016-12-07
+ Modified 2018-08-15
+ By [Angelo qiao](Angelo.qiao@dfrobot.com)
+ 
+ GNU Lesser General Public License.
+ See <http://www.gnu.org/licenses/> for details.
+ All above must be included in any redistribution
+ ****************************************************/
+
+/***********Notice and Trouble shooting***************
+ 1.Connection and Diagram can be found here
+ <https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
+ 2.This code is tested on Arduino Uno, Leonardo, Mega boards.
+ ****************************************************/
+
+#include "Arduino.h"
+#include "SoftwareSerial.h"
+#include "DFRobotDFPlayerMini.h"
+
+SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
+DFRobotDFPlayerMini myDFPlayer;
+void printDetail(uint8_t type, int value);
+
+void setup()
+{
+  mySoftwareSerial.begin(9600);
+  Serial.begin(115200);
+  
+  Serial.println();
+  Serial.println(F("DFRobot DFPlayer Mini Demo"));
+  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
+  
+  if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
+    Serial.println(F("Unable to begin:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card or USB drive!"));
+    while(true){
+      delay(0); // Code to compatible with ESP8266 watch dog.
+    }
+  }
+  Serial.println(F("DFPlayer Mini online."));
+}
+
+void loop()
+{
+  static unsigned long timer = millis();
+
+  if (millis() - timer > 3000) {
+    timer = millis();
+    
+    int value;
+
+//    value = myDFPlayer.readState(); //read mp3 state
+//    value = myDFPlayer.readVolume(); //read current volume
+//    value = myDFPlayer.readEQ(); //read EQ setting
+//    value = myDFPlayer.readFileCounts(); //read all file counts in SD card
+//    value = myDFPlayer.readCurrentFileNumber(); //read current play file number
+    value = myDFPlayer.readFileCountsInFolder(3); //read file counts in folder SD:/03
+    
+    if (value == -1) {  //Error while Reading.
+      printDetail(myDFPlayer.readType(), myDFPlayer.read());
+    }
+    else{ //Successfully get the result.
+      Serial.println(value);
+    }
+  }
+  
+  if (myDFPlayer.available()) {
+    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
+  }
+}
+
+void printDetail(uint8_t type, int value){
+  switch (type) {
+    case TimeOut:
+      Serial.println(F("Time Out!"));
+      break;
+    case WrongStack:
+      Serial.println(F("Stack Wrong!"));
+      break;
+    case DFPlayerCardInserted:
+      Serial.println(F("Card Inserted!"));
+      break;
+    case DFPlayerCardRemoved:
+      Serial.println(F("Card Removed!"));
+      break;
+    case DFPlayerCardOnline:
+      Serial.println(F("Card Online!"));
+      break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
+    case DFPlayerPlayFinished:
+      Serial.print(F("Number:"));
+      Serial.print(value);
+      Serial.println(F(" Play Finished!"));
+      break;
+    case DFPlayerError:
+      Serial.print(F("DFPlayerError:"));
+      switch (value) {
+        case Busy:
+          Serial.println(F("Card not found"));
+          break;
+        case Sleeping:
+          Serial.println(F("Sleeping"));
+          break;
+        case SerialWrongStack:
+          Serial.println(F("Get Wrong Stack"));
+          break;
+        case CheckSumNotMatch:
+          Serial.println(F("Check Sum Not Match"));
+          break;
+        case FileIndexOut:
+          Serial.println(F("File Index Out of Bound"));
+          break;
+        case FileMismatch:
+          Serial.println(F("Cannot Find File"));
+          break;
+        case Advertise:
+          Serial.println(F("In Advertise"));
+          break;
+        default:
+          break;
+      }
+      break;
+    default:
+      break;
+  }
+  
+}

library.properties

@@ -1,9 +1,9 @@
 name=DFRobotDFPlayerMini
-version=1.0.0
+version=1.0.3
 author=DFRobot
 maintainer=Angelo <angelo.qiao@dfrobot.com>
 sentence=Driver for DFPlayer Mini from DFRobot
-paragraph=Easy-to-use and reliable library for DFPlayer Mini 
+paragraph=Easy-to-use and reliable library for DFPlayer Mini
-category=Sensors
+category=Device Control
 url=https://github.com/DFRobot/DFRobotDFPlayerMini
 architectures=*