Added MIDI examples

Author: auxren

libraries/CurieBLE/examples/MIDIBLE/MIDIBLE.ino

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+/* Written by Oren Levy (auxren.com; @auxren) while competing on
+   America's Greatest Makers with help from Intel.
+   MIDI over BLE info from: https://developer.apple.com/bluetooth/Apple-Bluetooth-Low-Energy-MIDI-Specification.pdf
+
+  This sketch plays a random MIDI note (between 0 and 127) every 400ms.
+  For a 'smarter' sketch, check out my Airpeggiator example.
+  The Airpeggiator uses the Curie's IMU to allow you to play
+  an imaginary harp in the air. I included a quantizer so you can
+  select a key and scale so you can jam along with friends.
+  https://github.com/auxren/MIDIBLE101/tree/master/Airpeggiator
+
+  I have only tested MIDI over BLE using Apple devices. Android doesn't
+  support native MIDI over BLE yet and I haven't had much of a chance
+  to test with Windows machines.
+
+  To connect on a Mac, search for Audio MIDI Setup.
+  Click 'Window' on the top menu and choose 'Show MIDI Studio'.
+  Double click 'Bluetooth' and the bluetooth configuration window
+  will pop up. After loading the MIDIBLE sketch on your Arduino 101
+  you should see it advertising as Auxren. Click connect and the device
+  will be available as MIDI device in all your audio software like Garageband.
+
+  There are a few ways to connect using an iOS device. One way to to open
+  up Garageband. Click on the wrench icon in the upper right and choose 'Advanced'
+  Towards the bottom of advanced, you will see 'Bluetooth MIDI devices'.
+  You should see your Arduino 101 advertising in the list. Connect to
+  your device and it should be available to all other iOS MIDI apps you have.
+
+  To send data, you use the following line: char.setValue(d, n); where char is
+  the BLE characteristic (in our case, midiCha), d is the data, and n is the
+  number of bytes of data.
+  The first 2 bytes of data are the header byte and timestamp byte. If you want,
+  you can figure out the timestamping scheme, but I just left it with a generic value
+  since I haven't worked on anything timeing sensitive yet (like a sequencer).
+  The third, fourth, and fifth bytes are standard MIDI bytes. You can send more bytes
+  if you would like as long as it is complies to the standard MIDI spec.
+
+  The MIT License (MIT)
+
+  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 <CurieBLE.h>
+
+#define TXRX_BUF_LEN              20 //max number of bytes
+#define RX_BUF_LEN                20 //max number of bytes
+uint8_t rx_buf[RX_BUF_LEN];
+int rx_buf_num, rx_state = 0;
+uint8_t rx_temp_buf[20];
+uint8_t outBufMidi[128];
+
+//Buffer to hold 5 bytes of MIDI data. Note the timestamp is forced
+uint8_t midiData[] = {0x80, 0x80, 0x00, 0x00, 0x00};
+
+//Loads up buffer with values for note On
+void noteOn(char chan, char note, char vel) //channel 1
+{
+  midiData[2] = 0x90 + chan;
+  midiData[3] = note;
+  midiData[4] = vel;
+}
+
+//Loads up buffer with values for note Off
+void noteOff(char chan, char note) //channel 1
+{
+  midiData[2] = 0x80 + chan;
+  midiData[3] = note;
+  midiData[4] = 0;
+}
+
+BLEPeripheral midiDevice; // create peripheral instance
+
+BLEService midiSvc("03B80E5A-EDE8-4B33-A751-6CE34EC4C700"); // create service
+
+// create switch characteristic and allow remote device to read and write
+BLECharacteristic midiChar("7772E5DB-3868-4112-A1A9-F2669D106BF3", BLEWrite | BLEWriteWithoutResponse | BLENotify | BLERead, 5);
+
+void setup() {
+  Serial.begin(9600);
+
+  BLESetup();
+  Serial.println(("Bluetooth device active, waiting for connections..."));
+}
+
+void BLESetup()
+{
+  // set the local name peripheral advertises
+  midiDevice.setLocalName("Auxren");
+  midiDevice.setDeviceName("Auxren");
+
+  // set the UUID for the service this peripheral advertises
+  midiDevice.setAdvertisedServiceUuid(midiSvc.uuid());
+
+  // add service and characteristic
+  midiDevice.addAttribute(midiSvc);
+  midiDevice.addAttribute(midiChar);
+
+  // assign event handlers for connected, disconnected to peripheral
+  midiDevice.setEventHandler(BLEConnected, midiDeviceConnectHandler);
+  midiDevice.setEventHandler(BLEDisconnected, midiDeviceDisconnectHandler);
+
+  // assign event handlers for characteristic
+  midiChar.setEventHandler(BLEWritten, midiCharacteristicWritten);
+  // set an initial value for the characteristic
+  midiChar.setValue(midiData, 5);
+
+  // advertise the service
+  midiDevice.begin();
+}
+
+void loop() {
+
+  /*Simple randome note player to test MIDI output
+     Plays random note every 400ms
+  */
+  int note = random(0, 127);
+  //readMIDI();
+  noteOn(0, note, 127); //loads up midiData buffer
+  midiChar.setValue(midiData, 5);//midiData); //posts 5 bytes
+  delay(200);
+  noteOff(0, note);
+  midiChar.setValue(midiData, 5);//midiData); //posts 5 bytes
+  delay(200);
+}
+
+
+void midiDeviceConnectHandler(BLECentral& central) {
+  // central connected event handler
+  Serial.print("Connected event, central: ");
+  Serial.println(central.address());
+}
+
+void midiDeviceDisconnectHandler(BLECentral& central) {
+  // central disconnected event handler
+  Serial.print("Disconnected event, central: ");
+  Serial.println(central.address());
+}
+
+void midiCharacteristicWritten(BLECentral& central, BLECharacteristic& characteristic) {
+  // central wrote new value to characteristic, update LED
+  Serial.print("Characteristic event, written: ");
+}