return mReceiverActiveSensingActive in SensingTimeout Handler

return mReceiverActiveSensingActive in SensingTimeout Handler:
- true when all is OK and active sensing is received on time
- false when active sensing is **not** received on tome

examples/Hairless/Hairless.ino

@@ -0,0 +1,30 @@
+#include <MIDI.h>
+USING_NAMESPACE_MIDI
+
+struct MySerialSettings : public MIDI_NAMESPACE::DefaultSerialSettings
+{
+  static const long BaudRate = 115200;
+};
+
+unsigned long t1 = millis();
+
+MIDI_NAMESPACE::SerialMIDI<HardwareSerial, MySerialSettings> serialMIDI(Serial1);
+MIDI_NAMESPACE::MidiInterface<MIDI_NAMESPACE::SerialMIDI<HardwareSerial, MySerialSettings>> MIDI((MIDI_NAMESPACE::SerialMIDI<HardwareSerial, MySerialSettings>&)serialMIDI);
+
+void setup()
+{
+  MIDI.begin(1);
+}
+
+void loop()
+{
+  MIDI.read();
+
+  // send a note every second
+  if ((millis() - t1) > 1000)
+  {
+    t1 = millis();
+
+    MIDI.sendNoteOn(random(1, 127), 55, 1);
+  }
+}

examples/ReceiverActiveSensing/ReceiverActiveSensing.ino

@@ -0,0 +1,51 @@
+#include <MIDI.h>
+USING_NAMESPACE_MIDI
+
+struct MyMIDISettings : public MIDI_NAMESPACE::DefaultSettings
+{
+  // When setting UseReceiverActiveSensing to true, MIDI.read() *must* be called
+  // as often as possible (1000 / SenderActiveSensingPeriodicity per second).
+  //
+  // setting UseReceiverActiveSensing to true, adds 174 bytes of code.
+  //
+  // (Taken from a Roland MIDI Implementation Owner's manual)
+  // Once an Active Sensing message is received, the unit will begin monitoring
+  // the interval between all subsequent messages. If there is an interval of 420 ms
+  // or longer between messages while monitoring is active, the same processing
+  // as when All Sound Off, All Notes Off,and Reset All Controllers messages are
+  // received will be carried out. The unit will then stopmonitoring the message interval.
+
+  static const bool UseReceiverActiveSensing = true;
+
+  static const uint16_t ReceiverActiveSensingTimeout = 420;
+};
+
+MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial1, MIDI, MyMIDISettings);
+
+void activeSensingTimeoutExceptionHandler(bool active)
+{
+  if (!active)
+  {
+    MIDI.sendControlChange(AllSoundOff, 0, 1);
+    MIDI.sendControlChange(AllNotesOff, 0, 1);
+    MIDI.sendControlChange(ResetAllControllers, 0, 1);
+
+    digitalWrite(LED_BUILTIN, HIGH);
+  }
+  else
+    digitalWrite(LED_BUILTIN, LOW);
+}
+
+void setup()
+{
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, LOW);
+
+  MIDI.setHandleActiveSensingTimeout(activeSensingTimeoutExceptionHandler);
+  MIDI.begin(1);
+}
+
+void loop()
+{
+  MIDI.read();
+}

examples/SenderActiveSensing/SenderActiveSensing.ino

@@ -0,0 +1,58 @@
+#include <MIDI.h>
+USING_NAMESPACE_MIDI
+
+struct MyMIDISettings : public MIDI_NAMESPACE::DefaultSettings
+{
+  // When setting UseSenderActiveSensing to true, MIDI.read() *must* be called
+  // as often as possible (1000 / SenderActiveSensingPeriodicity per second). 
+  //
+  // setting UseSenderActiveSensing to true, adds 34 bytes of code.
+  //
+  // When using Active Sensing, call MIDI.read(); in the Arduino loop()
+  //
+  // from 'a' MIDI implementation manual: "Sent periodically"
+  // In the example here, a NoteOn is send every 1000ms (1s), ActiveSensing is
+  // send every 250ms after the last command.
+  // Logging the command will look like this:
+  //
+  // ...
+  // A.Sense  FE
+  // A.Sense  FE
+  // A.Sense  FE
+  // NoteOn   90 04 37 [E-2]
+  // A.Sense  FE
+  // A.Sense  FE
+  // A.Sense  FE
+  // NoteOn   90 04 37 [E-2]
+  // A.Sense  FE
+  // A.Sense  FE
+  // A.Sense  FE
+  // NoteOn   90 04 37 [E-2]
+  // ...
+
+  static const bool UseSenderActiveSensing = true;
+
+  static const uint16_t SenderActiveSensingPeriodicity = 250;
+};
+
+unsigned long t1 = millis();
+
+MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial1, MIDI, MyMIDISettings);
+
+void setup()
+{
+  MIDI.begin(1);
+}
+
+void loop()
+{
+  MIDI.read();
+
+  // send a note every second
+  if ((millis() - t1) > 1000)
+  {
+    t1 = millis();
+
+    MIDI.sendNoteOn(random(1, 127), 55, 1);
+  }
+}

src/MIDI.h

@@ -185,6 +185,7 @@ public:
 public:
     inline void setHandleMessage(void (*fptr)(const MidiMessage&)) { mMessageCallback = fptr; };
     inline void setHandleError(ErrorCallback fptr) { mErrorCallback = fptr; }
+    inline void setHandleActiveSensingTimeout(ActiveSensingTimeoutCallback fptr) { mActiveSensingTimeoutCallback = fptr; }
     inline void setHandleNoteOff(NoteOffCallback fptr) { mNoteOffCallback = fptr; }
     inline void setHandleNoteOn(NoteOnCallback fptr) { mNoteOnCallback = fptr; }
     inline void setHandleAfterTouchPoly(AfterTouchPolyCallback fptr) { mAfterTouchPolyCallback = fptr; }
@@ -212,6 +213,7 @@ private:
 
     void (*mMessageCallback)(const MidiMessage& message) = nullptr;
     ErrorCallback mErrorCallback = nullptr;
+    ActiveSensingTimeoutCallback mActiveSensingTimeoutCallback = nullptr;
     NoteOffCallback mNoteOffCallback = nullptr;
     NoteOnCallback mNoteOnCallback = nullptr;
     AfterTouchPolyCallback mAfterTouchPolyCallback = nullptr;
@@ -282,8 +284,7 @@ private:
     MidiMessage     mMessage;
     unsigned long   mLastMessageSentTime;
     unsigned long   mLastMessageReceivedTime;
-    unsigned long   mSenderActiveSensingPeriodicity;
+    bool            mReceiverActiveSensingActive;
-    bool            mReceiverActiveSensingActivated;
     int8_t          mLastError;
 
 private:

src/MIDI.hpp

@@ -44,11 +44,10 @@ inline MidiInterface<Transport, Settings, Platform>::MidiInterface(Transport& in
     , mThruFilterMode(Thru::Full)
     , mLastMessageSentTime(0)
     , mLastMessageReceivedTime(0)
-    , mSenderActiveSensingPeriodicity(0)
+    , mReceiverActiveSensingActive(false)
-    , mReceiverActiveSensingActivated(false)
     , mLastError(0)
 {
-        mSenderActiveSensingPeriodicity = Settings::SenderActiveSensingPeriodicity;
+    static_assert(!(Settings::UseSenderActiveSensing && Settings::UseReceiverActiveSensing), "UseSenderActiveSensing and UseReceiverActiveSensing can't be both set to true.");
 }
 
 /*! \brief Destructor for MidiInterface.
@@ -84,7 +83,8 @@ void MidiInterface<Transport, Settings, Platform>::begin(Channel inChannel)
     mCurrentRpnNumber  = 0xffff;
     mCurrentNrpnNumber = 0xffff;
 
-    mLastMessageSentTime = Platform::now();
+    mLastMessageSentTime = 
+    mLastMessageReceivedTime = Platform::now();
 
     mMessage.valid   = false;
     mMessage.type    = InvalidType;
@@ -712,27 +712,32 @@ template<class Transport, class Settings, class Platform>
 inline bool MidiInterface<Transport, Settings, Platform>::read(Channel inChannel)
 {
     #ifndef RegionActiveSending
+
     // Active Sensing. This message is intended to be sent
     // repeatedly to tell the receiver that a connection is alive. Use
-    // of this message is optional. When initially received, the
+    // of this message is optional.
-    // receiver will expect to receive another Active Sensing
+    if (Settings::UseSenderActiveSensing)
-    // message each 300ms (max), and if it does not then it will
-    // assume that the connection has been terminated. At
-    // termination, the receiver will turn off all voices and return to
-    // normal (non- active sensing) operation.
-    if (Settings::UseSenderActiveSensing && (mSenderActiveSensingPeriodicity > 0) && (Platform::now() - mLastMessageSentTime) > mSenderActiveSensingPeriodicity)
     {
+        // Send ActiveSensing <Settings::ActiveSensingPeriodicity> ms after the last command
+        if ((Platform::now() - mLastMessageSentTime) > Settings::SenderActiveSensingPeriodicity)
             sendActiveSensing();
-        mLastMessageSentTime = Platform::now();
     }
 
-    if (Settings::UseReceiverActiveSensing && mReceiverActiveSensingActivated && (mLastMessageReceivedTime + ActiveSensingTimeout < Platform::now()))
+    // Once an Active Sensing message is received, the unit will begin monitoring 
+    // the intervalbetween all subsequent messages. If there is an interval of 420 ms 
+    // or longer betweenmessages while monitoring is active, the same processing 
+    // as when All Sound Off, All Notes Off,and Reset All Controllers messages are 
+    // received will be carried out. The unit will then stopmonitoring the message interval.
+    if (Settings::UseReceiverActiveSensing && mReceiverActiveSensingActive)
     {
-        mReceiverActiveSensingActivated = false;
+        if ((Platform::now() - mLastMessageReceivedTime > Settings::ReceiverActiveSensingTimeout))
+        {
+            mReceiverActiveSensingActive = false;
 
-        mLastError |= 1UL << ErrorActiveSensingTimeout; // set the ErrorActiveSensingTimeout bit
+            // its up to the handler to send the stop processing messages
-        if (mErrorCallback)
+            // (also, no clue what the channel is on which to send them)
-            mErrorCallback(mLastError);
+            mActiveSensingTimeoutCallback(mReceiverActiveSensingActive);
+        }
     }
     #endif
 
@@ -744,25 +749,18 @@ inline bool MidiInterface<Transport, Settings, Platform>::read(Channel inChannel
 
     #ifndef RegionActiveSending
 
-    if (Settings::UseReceiverActiveSensing && mMessage.type == ActiveSensing)
+    if (Settings::UseReceiverActiveSensing)
     {
-        // When an ActiveSensing message is received, the time keeping is activated.
-        // When a timeout occurs, an error message is send and time keeping ends.
-        mReceiverActiveSensingActivated = true;
-
-        // is ErrorActiveSensingTimeout bit in mLastError on
-        if (mLastError & (1 << (ErrorActiveSensingTimeout - 1)))
-        {
-            mLastError &= ~(1UL << ErrorActiveSensingTimeout); // clear the ErrorActiveSensingTimeout bit
-            if (mErrorCallback)
-                mErrorCallback(mLastError);
-        }
-    }
-
-    // Keep the time of the last received message, so we can check for the timeout
-    if (Settings::UseReceiverActiveSensing && mReceiverActiveSensingActivated)
         mLastMessageReceivedTime = Platform::now();
 
+        if  (mMessage.type == ActiveSensing && !mReceiverActiveSensingActive)
+        {
+            mReceiverActiveSensingActive = true;
+
+            mActiveSensingTimeoutCallback(mReceiverActiveSensingActive);
+        }
+    }
+
     #endif
 
     handleNullVelocityNoteOnAsNoteOff();
@@ -1384,7 +1382,7 @@ inline void MidiInterface<Transport, Settings, Platform>::turnThruOff()
 template<class Transport, class Settings, class Platform>
 inline void MidiInterface<Transport, Settings, Platform>::UpdateLastSentTime()
 {
-    if (Settings::UseSenderActiveSensing && mSenderActiveSensingPeriodicity)
+    if (Settings::UseSenderActiveSensing)
         mLastMessageSentTime = Platform::now();
 }
 

src/midi_Defs.h

@@ -46,10 +46,6 @@ BEGIN_MIDI_NAMESPACE
 #define MIDI_PITCHBEND_MIN      -8192
 #define MIDI_PITCHBEND_MAX      8191
 
-/*! Receiving Active Sensing 
-*/
-static const uint16_t ActiveSensingTimeout = 300;
-
 // -----------------------------------------------------------------------------
 // Type definitions
 
@@ -61,13 +57,13 @@ typedef byte FilterMode;
 // -----------------------------------------------------------------------------
 // Errors
 static const uint8_t ErrorParse = 0;
-static const uint8_t ErrorActiveSensingTimeout = 1;
 static const uint8_t WarningSplitSysEx = 2;
 
 // -----------------------------------------------------------------------------
 // Aliasing
 
 using ErrorCallback                = void (*)(int8_t);
+using ActiveSensingTimeoutCallback = void (*)(bool);
 using NoteOffCallback              = void (*)(Channel channel, byte note, byte velocity);
 using NoteOnCallback               = void (*)(Channel channel, byte note, byte velocity);
 using AfterTouchPolyCallback       = void (*)(Channel channel, byte note, byte velocity);

src/midi_Settings.h

@@ -72,18 +72,15 @@ struct DefaultSettings
     */
     static const unsigned SysExMaxSize = 128;
 
-    /*! Global switch to turn on/off sender ActiveSensing
+    /*! Global switch to turn on/off sending and receiving ActiveSensing
-    Set to true to send ActiveSensing
+    Set to true to activate ActiveSensing
-    Set to false will not send ActiveSensing message (will also save memory)
+    Set to false will not send/receive ActiveSensing message (will also save 236 bytes of memory)
+
+    When setting UseActiveSensing to true, MIDI.read() *must* be called
+    as often as possible (1000 / ActiveSensingPeriodicity per second).
     */
     static const bool UseSenderActiveSensing = false;
 
-    /*! Global switch to turn on/off receiver ActiveSensing
-    Set to true to check for message timeouts (via ErrorCallback)
-    Set to false will not check if chained device are still alive (if they use ActiveSensing) (will also save memory)
-    */
-    static const bool UseReceiverActiveSensing = false;
-
     /*! Active Sensing is intended to be sent
     repeatedly by the sender to tell the receiver that a connection is alive. Use
     of this message is optional. When initially received, the
@@ -94,11 +91,20 @@ struct DefaultSettings
     normal (non- active sensing) operation.
 
     Typical value is 250 (ms) - an Active Sensing command is send every 250ms.
-    (All Roland devices send Active Sensing every 250ms)
+    (Most Roland devices send Active Sensing every 250ms)
-
-    Setting this field to 0 will disable sending MIDI active sensing.
     */
-    static const uint16_t SenderActiveSensingPeriodicity = 0;
+    static const uint16_t SenderActiveSensingPeriodicity = 300;
+
+    /*! Once an Active Sensing message is received, the unit will begin monitoring 
+    the intervalbetween all subsequent messages. If there is an interval of ActiveSensingPeriodicity ms 
+    or longer betweenmessages while monitoring is active, the same processing 
+    as when All Sound Off, All Notes Off,and Reset All Controllers messages are 
+    received will be carried out. The unit will then stopmonitoring the message interval.
+    */
+    static const bool UseReceiverActiveSensing = false;
+
+    static const uint16_t ReceiverActiveSensingTimeout = 300;
+
 };
 
 END_MIDI_NAMESPACE

src/serialMIDI.h

@@ -116,10 +116,11 @@ END_MIDI_NAMESPACE
 #endif
 
 /*! \brief Create an instance of the library attached to a serial port with
- custom settings.
+ custom MIDI settings (not to be confused with modified Serial Settings, like BaudRate) 
  @see DefaultSettings
  @see MIDI_CREATE_INSTANCE
  */
 #define MIDI_CREATE_CUSTOM_INSTANCE(Type, SerialPort, Name, Settings)           \
     MIDI_NAMESPACE::SerialMIDI<Type> serial##Name(SerialPort);\
     MIDI_NAMESPACE::MidiInterface<MIDI_NAMESPACE::SerialMIDI<Type>, Settings> Name((MIDI_NAMESPACE::SerialMIDI<Type>&)serial##Name);
+