Added full support for Midi Time Codes and Real Time messages

can now receive and send Midi Time Codes
and send Real Time messages

teensy3/usb_midi.c

@@ -51,6 +51,7 @@ void (*usb_midi_handleAfterTouch)(uint8_t ch, uint8_t pressure) = NULL;
 void (*usb_midi_handlePitchChange)(uint8_t ch, int pitch) = NULL;
 void (*usb_midi_handleSysEx)(const uint8_t *data, uint16_t length, uint8_t complete) = NULL;
 void (*usb_midi_handleRealTimeSystem)(uint8_t rtb) = NULL;
+void (*usb_midi_handleTimeCodeQuarterFrame)(uint16_t data) = NULL;
 
 // Maximum number of transmit packets to queue so we don't starve other endpoints for memory
 #define TX_PACKET_LIMIT 6
@@ -277,6 +278,14 @@ int usb_midi_read(uint32_t channel)
 			goto return_message;
 		}
 	}
+	if (type1 == 0x02) {
+		// From Timm Schlegelmilch, karg.music at gmail.com
+		// http://karg-music.blogspot.de/2015/06/receiving-midi-time-codes-over-usb-with.html
+		usb_midi_msg_type = 9;
+		if (usb_midi_handleTimeCodeQuarterFrame)
+			(*usb_midi_handleTimeCodeQuarterFrame)(n >> 16);
+		return 1;
+	}
 	return 0;
 }
 

teensy3/usb_midi.h

@@ -81,6 +81,7 @@ extern void (*usb_midi_handleAfterTouch)(uint8_t ch, uint8_t pressure);
 extern void (*usb_midi_handlePitchChange)(uint8_t ch, int pitch);
 extern void (*usb_midi_handleSysEx)(const uint8_t *data, uint16_t length, uint8_t complete);
 extern void (*usb_midi_handleRealTimeSystem)(uint8_t rtb);
+extern void (*usb_midi_handleTimeCodeQuarterFrame)(uint16_t data);
 
 #ifdef __cplusplus
 }
@@ -124,6 +125,28 @@ class usb_midi_class
         void sendSysEx(uint32_t length, const uint8_t *data) {
 		usb_midi_send_sysex(data, length);
 	}
+	void sendRealTime(uint32_t type) __attribute__((always_inline)) {
+		uint32_t data = ( (type & 0xFF) | ((type << 8) & 0xFF00) );
+		switch (type) {
+			case 0xF8: // Clock
+			case 0xFA: // Start
+			case 0xFC: // Stop
+			case 0xFB: // Continue
+			case 0xFE: // ActiveSensing
+			case 0xFF: // SystemReset
+				usb_midi_write_packed(data);
+				break;
+			default: // Invalid Real Time marker
+				break;
+		}
+	}
+	void sendTimeCodeQuarterFrame(uint32_t type, uint32_t value) __attribute__((always_inline)) {
+		uint32_t data = ( ((type & 0x07) << 4) | (value & 0x0F) );
+		sendTimeCodeQuarterFrame(data);	
+	}
+        void sendTimeCodeQuarterFrame(uint32_t data) __attribute__((always_inline)) {
+		usb_midi_write_packed(0xF108 | ((data & 0x7F) << 16));
+	}
         void send_now(void) {
 		usb_midi_flush_output();
 	}
@@ -173,6 +196,9 @@ class usb_midi_class
         inline void setHandleRealTimeSystem(void (*fptr)(uint8_t realtimebyte)) {
                 usb_midi_handleRealTimeSystem = fptr;
         };
+        inline void setHandleTimeCodeQuarterFrame(void (*fptr)(uint16_t data)) {
+                usb_midi_handleTimeCodeQuarterFrame = fptr;
+        };
 	private:
 };