added usb midi and its example

Author: hathach

examples/MIDI/midi_test/midi_test.ino

@@ -0,0 +1,104 @@
+/*********************************************************************
+ Adafruit invests time and resources providing this open source code,
+ please support Adafruit and open-source hardware by purchasing
+ products from Adafruit!
+
+ MIT license, check LICENSE for more information
+ Copyright (c) 2019 Ha Thach for Adafruit Industries
+ All text above, and the splash screen below must be included in
+ any redistribution
+*********************************************************************/
+
+#include <Arduino.h>
+#include "Adafruit_TinyUSB.h"
+#include <MIDI.h>
+
+// USB MIDI object
+Adafruit_USBD_MIDI usb_midi;
+
+// Create a new instance of the Arduino MIDI Library,
+// and attach usb_midi as the transport.
+MIDI_CREATE_INSTANCE(Adafruit_USBD_MIDI, usb_midi, MIDI);
+
+// Variable that holds the current position in the sequence.
+uint32_t position = 0;
+
+// Store example melody as an array of note values
+byte note_sequence[] = {
+  74,78,81,86,90,93,98,102,57,61,66,69,73,78,81,85,88,92,97,100,97,92,88,85,81,78,
+  74,69,66,62,57,62,66,69,74,78,81,86,90,93,97,102,97,93,90,85,81,78,73,68,64,61,
+  56,61,64,68,74,78,81,86,90,93,98,102
+};
+
+void setup()
+{
+  pinMode(LED_BUILTIN, OUTPUT);
+  
+  // Initialize MIDI, and listen to all MIDI channels
+  // This will also call usb_midi's begin()
+  MIDI.begin(MIDI_CHANNEL_OMNI);
+
+  // Attach the handleNoteOn function to the MIDI Library. It will
+  // be called whenever the Bluefruit receives MIDI Note On messages.
+  MIDI.setHandleNoteOn(handleNoteOn);
+
+  // Do the same for MIDI Note Off messages.
+  MIDI.setHandleNoteOff(handleNoteOff);
+
+  Serial.begin(115200);
+
+  // wait for native usb serial to connect
+  while(!Serial) delay(1);
+
+  Serial.println("Adafruit TinyUSB MIDI example");
+}
+
+void loop()
+{
+  static uint32_t start_ms = 0;
+  if ( millis() - start_ms > 266 )
+  {
+    start_ms += 266;
+    
+    // Setup variables for the current and previous
+    // positions in the note sequence.
+    int previous = position - 1;
+  
+    // If we currently are at position 0, set the
+    // previous position to the last note in the sequence.
+    if (previous < 0) {
+      previous = sizeof(note_sequence) - 1;
+    }
+  
+    // Send Note On for current position at full velocity (127) on channel 1.
+    MIDI.sendNoteOn(note_sequence[position], 127, 1);
+  
+    // Send Note Off for previous note.
+    MIDI.sendNoteOff(note_sequence[previous], 0, 1);
+  
+    // Increment position
+    position++;
+  
+    // If we are at the end of the sequence, start over.
+    if (position >= sizeof(note_sequence)) {
+      position = 0;
+    }
+  }
+
+  // read any new MIDI messages
+  MIDI.read();  
+}
+
+void handleNoteOn(byte channel, byte pitch, byte velocity)
+{
+  // Log when a note is pressed.
+  Serial.printf("Note on: channel = %d, pitch = %d, velocity - %d", channel, pitch, velocity);
+  Serial.println();
+}
+
+void handleNoteOff(byte channel, byte pitch, byte velocity)
+{
+  // Log when a note is released.
+  Serial.printf("Note off: channel = %d, pitch = %d, velocity - %d", channel, pitch, velocity);
+  Serial.println();
+}

src/Adafruit_TinyUSB.h

@@ -27,5 +27,6 @@
 
 #include "Adafruit_USBD_MSC.h"
 #include "Adafruit_USBD_HID.h"
+#include "Adafruit_USBD_MIDI.h"
 
 #endif /* ADAFRUIT_TINYUSB_H_ */

src/Adafruit_USBD_MIDI.cpp

@@ -0,0 +1,88 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 hathach for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "Adafruit_USBD_MIDI.h"
+
+#if CFG_TUD_MIDI
+
+//--------------------------------------------------------------------+
+// MACRO TYPEDEF CONSTANT ENUM DECLARATION
+//--------------------------------------------------------------------+
+#define EPOUT   0x00
+#define EPIN    0x80
+#define EPSIZE  64
+
+Adafruit_USBD_MIDI::Adafruit_USBD_MIDI(void)
+{
+
+}
+
+bool Adafruit_USBD_MIDI::begin(void)
+{
+  if ( !USBDevice.addInterface(*this) ) return false;
+
+  return true;
+}
+
+uint16_t Adafruit_USBD_MIDI::getDescriptor(uint8_t* buf, uint16_t bufsize)
+{
+  // usb core will automatically update interface number and endpoint number
+  uint8_t desc[] = { TUD_MIDI_DESCRIPTOR(0, 0, EPOUT, EPIN, EPSIZE) };
+  uint16_t const len = sizeof(desc);
+
+  if ( bufsize < len ) return 0;
+  memcpy(buf, desc, len);
+  return len;
+}
+
+int Adafruit_USBD_MIDI::read (void)
+{
+  uint8_t ch;
+  return tud_midi_read(&ch, 1) ? (int) ch : (-1);
+}
+
+size_t Adafruit_USBD_MIDI::write (uint8_t b)
+{
+  return tud_midi_write(0, &b, 1);
+}
+
+int Adafruit_USBD_MIDI::available (void)
+{
+  return tud_midi_available();
+}
+
+int Adafruit_USBD_MIDI::peek (void)
+{
+  // MIDI Library doen't use peek
+  return -1;
+}
+
+void Adafruit_USBD_MIDI::flush (void)
+{
+  // MIDI Library doen't use flush
+}
+
+#endif
+
+

src/Adafruit_USBD_MIDI.h

@@ -0,0 +1,51 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 hathach for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef ADAFRUIT_USBD_MIDI_H_
+#define ADAFRUIT_USBD_MIDI_H_
+
+#include "Adafruit_TinyUSB_Core.h"
+
+class Adafruit_USBD_MIDI : public Stream, Adafruit_USBD_Interface
+{
+  public:
+    Adafruit_USBD_MIDI(void);
+
+    bool begin(void);
+
+    // for MIDI library
+    bool begin(uint32_t baud) { (void) baud; return begin(); }
+
+    // Stream interface to use with MIDI Library
+    virtual int    read       ( void );
+    virtual size_t write      ( uint8_t b );
+    virtual int    available  ( void );
+    virtual int    peek       ( void );
+    virtual void   flush      ( void );
+
+    // fron Adafruit_USBD_Interface
+    virtual uint16_t getDescriptor(uint8_t* buf, uint16_t bufsize);
+};
+
+#endif /* ADAFRUIT_USBD_MIDI_H_ */