Arduino UNO USB MIDI firmware

I've put together a basic USB MIDI driver for the UNO's atmega8u2. I've tested it using the demo sketch below with GarageBand and it seems to be working well. By flashing this firmware onto your UNO's atmega8u2 you can turn the UNO into a USB MIDI device. See my earlier posts on how to load the firmware via DFU mode.

The MIDI driver expects to receive a serial message with the following format:
Byte Description
0 Command: E.g. 0x90 Note On, 0x80 Note Off.
1 Channel: 1 to 16
2 MIDI data byte 2. Depends on Command, for 0x80 and 0x90 this is the Pitch values 1-127
3 MIDI data byte 3. Depends on Command, for 0x80 and 0x90 this is the Velocity values 1-127

The serial port should be configured for 115200 baud.

Here's the firmware files, source, and example sketch to send 5 notes to the host.

Download file "Arduino-usbmidi-0.1.hex"
Download file "Arduino-usbmidi-0.1-mega2560.hex"
Download file "arduino-usbmidi-0.1.tar.gz"
Download file "midi_usb_demo.pde"

More detail on the MIDI messages can be found here at www.midi.org.

More detail on the MIDI USB interface standard can be found in the MIDI 1.0 Specification.

You can download a copy the USB Serial firmware here: Arduino USB Serial firmware. You'll need to replace the MIDI firmware with this whenever you want to upload a new sketch. Flash this by putting the board in to DFU mode and using dfu-programmer or flip.


Comments

gopiballava (unauthenticated)
Apr 5, 2011

Wow! That worked! Thank you! My iPad now sees my Arduino :)
I tried to get the toolchain stuff working, but there were so many different "make some changes, they're not documented" style comments that I was about to give up.

One thing I was thinking might be interesting: iPad MIDI "transparent, but not" mode. By default, it behaves just like normal. However, you send a special command, and it maps MIDI commands into standard serial commands, and the reverse.

You have a library on the iPad which mangles the bytes you want to send and encapsulates them into MIDI message.
eg: If I want to send "Hello, World" out the serial port, I send a specific sequence of MIDI key events. The reverse would also be true.

This would allow for an iPad app to do generic bi-directional serial I/O with an Arduino - and would also let an app program new sketches.

(MIDI devices can be used without Made For iPhone licensing / certification...hence the workaround)

gopiballava (unauthenticated)
Apr 5, 2011

Is it bi-directional? The RX LED seems to be constantly glowing, and it doesn't seem to have any data when I try to send MIDI commands out.

darran
Apr 5, 2011

Hey gopiballava, good to hear that its mostly working for you. I haven't done anything for the rx direction - the firmware just receives the data and drops it. I'll see if I can get something put together tonight that would be usable.

As far as loading sketches goes, I'm not sure that that will work without some additional support in the MIDI firmware.

darran
Apr 5, 2011

Gopiballava, I have a hex file that should work bi-directionally, I can't test it until I get my Arduino back from my coworker tomorrow. If you send me your email address I'll send you the hex file to try out. My email is darran [at] hunt [dot] net [dot] nz.

I will show this on my next Ardunio Workshop for musicans. (unauthenticated)
Jun 6, 2011

Thanks for the great work. Will show this idea during my next Arduino Workshop to give a view into the future...

Victor (unauthenticated)
Jun 9, 2012

Hi, so where are we today? Is it possible to make Arduino a usb device?

Magic (unauthenticated)
Jul 1, 2012

Thanks Darren ! This was the easiest way for me to get the arduino to appear as a MIDI USB device.

darran
Jul 9, 2012

Hey Magic, cool that its working for you. Let me know if you do a write-up on your project.

fxw (unauthenticated)
Jul 12, 2012

Hi, and Thanks !
arduino uno r3 appear as a MIDI USB device. But, when i try to send midi data (0xB0, 0x01, 0xVV), arduino send something like that : 0xB0, 0xB0, 0x01, 0xB0, 0xVV, 0xB0, 0xVV....

here is the code i sent (very simple !) :

void setup() {
Serial.begin(115200);
}

void loop() {
for (int VC = 0x00; VC < 0x7F; VC ++) {

Serial.write(0xB0);
Serial.write(0x01);
Serial.write(VC);
Serial.flush();

delay(100);
}
}

nan (unauthenticated)
Sep 29, 2012

Disable MIDI thru in midi.h

Soranne (unauthenticated)
Jan 1, 2013

Any version for the Atmega 16U2 (arduino uno r3) ?

darran
Jan 20, 2013

The 8U2 version will work on the 16U2 also.

Ranko (unauthenticated)
Mar 28, 2013

Hello it effectively works with the 16U2 on W7 as a midi device but WITH XP it works like an audio device so the midi don ' t appears..

John M (unauthenticated)
Jul 23, 2013

Any chance of getting this working with MIDI SysEx (more specifically MIDI NRPN messages)?

Karím (unauthenticated)
Aug 4, 2013

Does it work with the ATmega32U4 of the Arduino Pro Micro? Great work btw! Thank you.

Alex K (unauthenticated)
Jan 15, 2014

Hi Darren.

Did we get the Bi-Directional code working?

Alex.

chrisbee (unauthenticated)
Mar 6, 2014

i can't get it working. i loaded the .hex file (both hex files above are the same by the way) onto the 8u2 with my stk500 programmer but i don't know if i should change the fuses, and the computer does not recognize it as a USB device. help?

Mouse (unauthenticated)
Apr 15, 2016

What the hay.
Spammers on here

AARRTT (unauthenticated)
Jun 24, 2016

Hello try with this sketch in the arduino UNO but not turned , someone could correct some value this bad please

// Basic MIDI Controller code for reading all of the Arduino's digital and analogue inputs
// and sending them as MIDI messages to the host PC.
//
// Authors: Michael Balzer
// Teensy USB-MIDI edit: Tim Crawford
//
// Revision History:
// Date | Author | Change
// ---------------------------------------------------
// 2011-02-22 | MSB | Initial Release
// 2011-03-01 | MSB | Updated MIDI output to send same MIDI signals as official MIDI Fighter
// | | Reduced debounce length from 5ms to 2ms
// 2011-03-14 | MSB | Modified analogue input logic so only pins moved within the timer
// | | period are updated, not all of them.
// | | Experimental code added for higher speed (but less accurate) analogue reads
// | | Reduced analogue timer length from 1000ms to 250ms
// 2011-03-21 | MSB | Removed TimerOne library. Each analogue pin now maintains its own time
// | | since it was last moved, rather than one timer for all pins. This stops
// | | sending jittery movements on analogue inputs which haven't been touched.
// 2011-04-11 | TC | Teensy USB code added.
// | MSB | Updated with #defines for Arduino Mega and Teensy USB for easy compilation
// 2011-10-23 | MSB | Added default #defines for Teensy 2.0 and Teensy++ 2.0 digital pins
// | | Removed #defines for Teensy 1.0 as usbMIDI is not supported
// 2012-01-20 | MSB | Updated to support Arduino 1.0 (updated Serial.print to Serial.write)
//
//
// This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
// See http://creativecommons.org/licenses/by-nc-sa/3.0/ for license details.

#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define ARDUINO_MEGA
#elif defined(__AVR_AT90USB646__)
#define TEENSY_PLUS_PLUS
#elif defined(__AVR_ATmega32U4__)
#define TEENSY_2
#elif defined(__AVR_AT90USB1286__)
#define TEENSY_PLUS_PLUS_2
#else
#define ARDUINO
#endif

// Uncomment this line to send debug messages to the serial monitor
//#define DEBUG

// Uncomment this line to enable outputs corresponding to the MIDI Fighter so MF mappings can be used in Traktor.
//#define MIDI_FIGHTER

//#define FASTADC
// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

// MIDI mapping taken from http://www.nortonmusic.com/midi_cc.html
#define MIDI_CC_MODULATION 0x01
#define MIDI_CC_BREATH 0x02
#define MIDI_CC_VOLUME 0x07
#define MIDI_CC_BALANCE 0x08
#define MIDI_CC_PAN 0x0A
#define MIDI_CC_EXPRESSION 0x0B
#define MIDI_CC_EFFECT1 0x0C
#define MIDI_CC_EFFECT2 0x0D

#define MIDI_CC_GENERAL1 0x0E
#define MIDI_CC_GENERAL2 0x0F
#define MIDI_CC_GENERAL3 0x10
#define MIDI_CC_GENERAL4 0x11
#define MIDI_CC_GENERAL5 0x12
#define MIDI_CC_GENERAL6 0x13
#define MIDI_CC_GENERAL7 0x14
#define MIDI_CC_GENERAL8 0x15
#define MIDI_CC_GENERAL9 0x16
#define MIDI_CC_GENERAL10 0x17
#define MIDI_CC_GENERAL11 0x18
#define MIDI_CC_GENERAL12 0x19
#define MIDI_CC_GENERAL13 0x1A
#define MIDI_CC_GENERAL14 0x1B
#define MIDI_CC_GENERAL15 0x1C
#define MIDI_CC_GENERAL16 0x1D
#define MIDI_CC_GENERAL17 0x1E
#define MIDI_CC_GENERAL18 0x1F

#define MIDI_CC_GENERAL1_FINE 0x2E
#define MIDI_CC_GENERAL2_FINE 0x2F
#define MIDI_CC_GENERAL3_FINE 0x30
#define MIDI_CC_GENERAL4_FINE 0x31
#define MIDI_CC_GENERAL5_FINE 0x32
#define MIDI_CC_GENERAL6_FINE 0x33
#define MIDI_CC_GENERAL7_FINE 0x34
#define MIDI_CC_GENERAL8_FINE 0x35
#define MIDI_CC_GENERAL9_FINE 0x36
#define MIDI_CC_GENERAL10_FINE 0x37
#define MIDI_CC_GENERAL11_FINE 0x38
#define MIDI_CC_GENERAL12_FINE 0x39
#define MIDI_CC_GENERAL13_FINE 0x3A
#define MIDI_CC_GENERAL14_FINE 0x3B
#define MIDI_CC_GENERAL15_FINE 0x3C
#define MIDI_CC_GENERAL16_FINE 0x3D
#define MIDI_CC_GENERAL17_FINE 0x3E
#define MIDI_CC_GENERAL18_FINE 0x3F

#define MIDI_CC_SUSTAIN 0x40
#define MIDI_CC_REVERB 0x5B
#define MIDI_CC_CHORUS 0x5D
#define MIDI_CC_CONTROL_OFF 0x79
#define MIDI_CC_NOTES_OFF 0x78

#define NOTE_C0 0x00 // 0
#define NOTE_C1 0x12 // 18
#define NOTE_C2 0x24 // 36

#if defined(ARDUINO_MEGA)
// Number of digital inputs. Can be anywhere from 0 to 68.
#define NUM_DI 52
// Number of analogue inputs. Can be anywhere from 0 to 16.
#define NUM_AI 16
#elif defined(TEENSY_PLUS_PLUS)
// Number of digital inputs. Can be anywhere from 0 to 46.
#define NUM_DI 38
// Number of analogue inputs. Can be anywhere from 0 to 8.
#define NUM_AI 8
#elif defined(TEENSY_2)
// Number of digital inputs. Can be anywhere from 0 to 25.
#define NUM_DI 13
// Number of analogue inputs. Can be anywhere from 0 to 12.
#define NUM_AI 10
#elif defined(TEENSY_PLUS_PLUS_2)
// Number of digital inputs. Can be anywhere from 0 to 46.
#define NUM_DI 38
// Number of analogue inputs. Can be anywhere from 0 to 8.
#define NUM_AI 6
#else
// Number of digital inputs. Can be anywhere from 0 to 18.
#define NUM_DI 18
// Number of analogue inputs. Can be anywhere from 0 to 6.
#define NUM_AI 6
#endif

#if defined(MIDI_FIGHTER) && defined(ARDUINO)
#define MIDI_CHANNEL 3
// First note, starting from lower left button
#define NOTE NOTE_C2
// When mapping to a MIDI Fighter we need to skip a row of buttons. Set this from 0-3 to define which row to skip.
// Rows are ordered from bottom to top (same as the MIDI Fighter's button layout).
#define SKIP_ROW 2
// This pin order corresponds to the bottom left button being zero, increasing by one as we move from left to right, bottom to top
// 8 9 10 11
// 4 5 6 7
// 0 1 2 3
// This array size must match NUM_DI above.
#define DIGITAL_PIN_ORDER 10, 11, 12, 13, 6, 7, 8, 9, 2, 3, 4, 5, 14, 15, 16, 17, 0, 1
#else
#define MIDI_CHANNEL 1
// First note, starting from upper left button
#define NOTE NOTE_C0
// This pin order corresponds to the top left button being zero, increasing by one as we move from left to right, top to bottom
// 0 1 2 3
// 4 5 6 7
// 8 9 10 11
// This array size must match NUM_DI above.
#if defined(ARDUINO_MEGA)
#define DIGITAL_PIN_ORDER 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53
#elif defined(TEENSY_PLUS_PLUS)
#define DIGITAL_PIN_ORDER 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37
#elif defined(TEENSY_2)
#define DIGITAL_PIN_ORDER 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
#elif defined(TEENSY_PLUS_PLUS_2)
#define DIGITAL_PIN_ORDER 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37
#else
#define DIGITAL_PIN_ORDER 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
#endif
#endif

#if defined(ARDUINO_MEGA)
#define ANALOGUE_PIN_ORDER A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15
#elif defined(TEENSY_PLUS_PLUS)
#define ANALOGUE_PIN_ORDER 0, 1, 2, 3, 4, 5, 6, 7
#elif defined(TEENSY_2)
#define ANALOGUE_PIN_ORDER 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
#elif defined(TEENSY_PLUS_PLUS_2)
#define ANALOGUE_PIN_ORDER 0, 1, 2, 3, 4, 5, 6, 7
#else
#define ANALOGUE_PIN_ORDER A0, A1, A2, A3, A4, A5
#endif

#if defined(TEENSY_PLUS_PLUS) || defined(TEENSY_2) || defined(TEENSY_PLUS_PLUS_2)
#define LED_PIN PIN_D6
#else
#define LED_PIN 13
#endif

#define MIDI_CC MIDI_CC_GENERAL1

// Comment this line out to disable button debounce logic.
// See http://arduino.cc/en/Tutorial/Debounce on what debouncing is used for.
#define DEBOUNCE
// Debounce time length in milliseconds
#define DEBOUNCE_LENGTH 2

// Comment this line out to disable analogue filtering
#define ANALOGUE_FILTER
// A knob or slider movement must initially exceed this value to be recognised as an input. Note that it is
// for a 7-bit (0-127) MIDI value.
#ifdef FASTADC
#define FILTER_AMOUNT 3
#else
#define FILTER_AMOUNT 2
#endif
// Timeout is in microseconds
#define ANALOGUE_INPUT_CHANGE_TIMEOUT 250000

// Array containing a mapping of digital pins to channel index.
byte digitalInputMapping[NUM_DI] = {DIGITAL_PIN_ORDER};

// Array containing a mapping of analogue pins to channel index. This array size must match NUM_AI above.
byte analogueInputMapping[NUM_AI] = {ANALOGUE_PIN_ORDER};

// Contains the current state of the digital inputs.
byte digitalInputs[NUM_DI];
// Contains the current value of the analogue inputs.
byte analogueInputs[NUM_AI];

// Variable to hold temporary digital reads, used for debounce logic.
byte tempDigitalInput;
// Variable to hold temporary analogue values, used for analogue filtering logic.
byte tempAnalogueInput;

// Preallocate the for loop index so we don't keep reallocating it for every program iteration.
byte i = 0;
byte digitalOffset = 0;
// Variable to hold difference between current and new analogue input values.
byte analogueDiff = 0;
// This is used as a flag to indicate that an analogue input is changing.
boolean analogueInputChanging[NUM_AI];
// Time the analogue input was last moved
unsigned long analogueInputTimer[NUM_AI];

#ifdef DEBUG
unsigned long loopTime = 0;
unsigned long serialSendTime = 0;
#endif

void setup()
{
// Taken from http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1208715493/11
#ifdef FASTADC
// set prescale to 16
sbi(ADCSRA,ADPS2) ;
cbi(ADCSRA,ADPS1) ;
cbi(ADCSRA,ADPS0) ;
#endif

// Only enable serial on the Arduino or when debugging. The Teensy board should be set as a usb-midi device so serial is not needed.
#if defined(ARDUINO) || defined(ARDUINO_MEGA) || defined(DEBUG)
// Enable serial I/O at 115200 kbps. This is faster than the standard MIDI rate of 31250 kbps.
// The PC application which we connect to will automatically take the higher sample rate and send MIDI
// messages out at the correct rate. We only send things faster in case there is any latency.
Serial.begin(115200);
#endif

// Initialise each digital input channel.
for (i = 0; i < NUM_DI; i++)
{
// Set the pin direction to input.
pinMode(digitalInputMapping[i], INPUT);

// Don't enable pullup resistor on LED_PIN, as the LED and resistor will always pull it low, meaning the input won't work.
// Instead an external pulldown resistor must be used on LED_PIN.
// NOTE: This will cause all of the high/low logic for LED_PIN to be inverted.
if (digitalInputMapping[i] != LED_PIN)
{
// Enable the pull-up resistor. This call must come after the above pinMode call.
digitalWrite(digitalInputMapping[i], HIGH);
}

// Initialise the digital state with a read to the input pin.
digitalInputs[i] = digitalRead(digitalInputMapping[i]);
}

// Initialise each analogue input channel.
for (i = 0; i < NUM_AI; i++)
{
// Set the pin direction to input.
pinMode(analogueInputMapping[i], OUTPUT);

// Initialise the analogue value with a read to the input pin.
//analogueInputs[i] = analogRead(analogueInputMapping[i]);
digitalWrite(analogueInputMapping[i],HIGH);
// Assume no analogue inputs are active
analogueInputChanging[i] = false;
analogueInputTimer[i] = 0;
}

#ifdef DEBUG
serialSendTime = millis();
#endif
}

void loop()
{
#ifdef DEBUG
loopTime = micros();
#endif

for (i = 0; i < NUM_DI; i++)
{
#ifdef MIDI_FIGHTER
if (i >= SKIP_ROW * 4)
{
digitalOffset = i + 4;
}
else
{
#endif

digitalOffset = i;

#ifdef MIDI_FIGHTER
}
#endif

// Read the current state of the digital input and store it temporarily.
tempDigitalInput = digitalRead(digitalInputMapping[i]);

// Check if the last state is different to the current state.
if (digitalInputs[i] != tempDigitalInput)
{
#ifdef DEBOUNCE
// Wait for a short period of time, and then take a second reading from the input pin.
delay(DEBOUNCE_LENGTH);
// If the second reading is the same as the initial reading, assume it must be true.
if (tempDigitalInput == digitalRead(digitalInputMapping[i]))
{
#endif
// Record the new digital input state.
digitalInputs[i] = tempDigitalInput;

// Moved from HIGH to LOW (button pressed)
if (digitalInputs[i] == 0)
{
// All the digital inputs use pullup resistors, except LED_PIN so the logic is inverted
if (digitalInputMapping[i] != LED_PIN)
{
noteOn(MIDI_CHANNEL, NOTE + digitalOffset, 0x7F); // Channel 1, middle C, maximum velocity
}
else
{
noteOff(MIDI_CHANNEL, NOTE + digitalOffset); // Channel 1, middle C
}
}
// Moved from LOW to HIGH (button released)
else
{
// All the digital inputs use pullup resistors, except LED_PIN so the logic is inverted
if (digitalInputMapping[i] != LED_PIN)
{
noteOff(MIDI_CHANNEL, NOTE + digitalOffset); // Channel 1, middle C
}
else
{
noteOn(MIDI_CHANNEL, NOTE + digitalOffset, 0x7F); // Channel 1, middle C, maximum velocity
}
}
#ifdef DEBOUNCE
}
#endif
}
}

/*
* Analogue input logic:
* The Arduino uses a 10-bit (0-1023) analogue to digital converter (ADC) on each of its analogue inputs.
* The ADC isn't very high resolution, so if a pot is in a position such that the output voltage is 'between'
* what it can detect (say 2.505V or about 512.5 on a scale of 0-1023) then the value read will constantly
* fluctuate between two integers (in this case 512 and 513).
*
* If we're simply looking for a change in the analogue input value like in the digital case above, then
* there will be cases where the value is always changing, even though the physical input isn't being moved.
* This will in turn send out a constant stream of MIDI messages to the connected software which may be problematic.
*
* To combat this, we require that the analogue input value must change by a certain threshold amount before
* we register that it is actually changing. This is good in avoiding a constantly fluctuating value, but has
* the negative effect of a reduced input resolution. For example if the threshold amount was 2 and we slowly moved
* a slider through it's full range, we would only detect every second value as a change, in effect reducing the
* already small 7-bit MIDI value to a 6-bit MIDI value.
*
* To get around this problem but still use the threshold logic, a timer is used. Initially the analogue input
* must exceed the threshold to be detected as an input. Once this occurs, we then read every value coming from the
* analogue input (not just those exceeding a threshold) giving us full 7-bit resolution. At the same time the
* timer is started. This timer is used to keep track of whether an input hasn't been moved for a certain time
* period. If it has been moved, the timer is restarted. If no movement occurs the timer is just left to run. When
* the timer expires the analogue input is assumed to be no longer moving. Subsequent movements must exceed the
* threshold amount.
*/
for (i = 0; i < NUM_AI; i++)
{
// Read the analogue input pin, dividing it by 8 so the 10-bit ADC value (0-1023) is converted to a 7-bit MIDI value (0-127).
tempAnalogueInput = analogRead(analogueInputMapping[i]) / 8;

#ifdef ANALOGUE_FILTER
// Take the absolute value of the difference between the curent and new values
analogueDiff = abs(tempAnalogueInput - analogueInputs[i]);
// Only continue if the threshold was exceeded, or the input was already changing
if ((analogueDiff > 0 && analogueInputChanging[i] == true) || analogueDiff >= FILTER_AMOUNT)
{
// Only restart the timer if we're sure the input isn't 'between' a value
// ie. It's moved more than FILTER_AMOUNT
if (analogueInputChanging[i] == false || analogueDiff >= FILTER_AMOUNT)
{
// Reset the last time the input was moved
analogueInputTimer[i] = micros();

// The analogue input is moving
analogueInputChanging[i] = true;
}
else if (micros() - analogueInputTimer[i] > ANALOGUE_INPUT_CHANGE_TIMEOUT)
{
analogueInputChanging[i] = false;
}

// Only send data if we know the analogue input is moving
if (analogueInputChanging[i] == true)
{
// Record the new analogue value
analogueInputs[i] = tempAnalogueInput;

// Send the analogue value out on the general MIDI CC (see definitions at beginning of this file)
controlChange(MIDI_CHANNEL, MIDI_CC + i, analogueInputs[i]);
}
}
#else
if (analogueInputs[i] != tempAnalogueInput)
{
// Record the new analogue value
analogueInputs[i] = tempAnalogueInput;

// Send the analogue value out on the general MIDI CC (see definitions at beginning of this file)
controlChange(MIDI_CHANNEL, MIDI_CC + i, analogueInputs[i]);
}
#endif
}

#ifdef DEBUG
loopTime = micros() - loopTime;

// Print the loop execution time once per second
if (millis() - serialSendTime > 1000)
{
Serial.print("Loop execution time (us): ");
Serial.println(loopTime);

serialSendTime = millis();
}
#endif
}

// Send a MIDI note on message
void noteOn(byte channel, byte pitch, byte velocity)
{
// 0x90 is the first of 16 note on channels. Subtract one to go from MIDI's 1-16 channels to 0-15
channel += 0x90 - 1;

// Ensure we're between channels 1 and 16 for a note on message
if (channel >= 0x90 && channel <= 0x9F)
{
#ifdef DEBUG
Serial.print("Button pressed: ");
Serial.println(pitch);
#elif defined(TEENSY_PLUS_PLUS) || defined(TEENSY_2) || defined(TEENSY_PLUS_PLUS_2)
usbMIDI.sendNoteOn(pitch, velocity, channel);
#else
Serial.write(channel);
Serial.write(pitch);
Serial.write(velocity);
#endif
}
}

// Send a MIDI note off message
void noteOff(byte channel, byte pitch)
{
// 0x80 is the first of 16 note off channels. Subtract one to go from MIDI's 1-16 channels to 0-15
channel += 0x80 - 1;

// Ensure we're between channels 1 and 16 for a note off message
if (channel >= 0x80 && channel <= 0x8F)
{
#ifdef DEBUG
Serial.print("Button released: ");
Serial.println(pitch);
#elif defined(TEENSY_PLUS_PLUS) || defined(TEENSY_2) || defined(TEENSY_PLUS_PLUS_2)
usbMIDI.sendNoteOff(pitch, 0x00, channel);
#else
Serial.write(channel);
Serial.write(pitch);
Serial.write((byte)0x00);
#endif
}
}

// Send a MIDI control change message
void controlChange(byte channel, byte control, byte value)
{
// 0xB0 is the first of 16 control change channels. Subtract one to go from MIDI's 1-16 channels to 0-15
channel += 0xB0 - 1;

// Ensure we're between channels 1 and 16 for a CC message
if (channel >= 0xB0 && channel <= 0xBF)
{
#ifdef DEBUG
Serial.print(control - MIDI_CC);
Serial.print(": ");
Serial.println(value);
#elif defined(TEENSY_PLUS_PLUS) || defined(TEENSY_2) || defined(TEENSY_PLUS_PLUS_2)
usbMIDI.sendControlChange(control, value, channel);
#else
Serial.write(channel);
Serial.write(control);
Serial.write(value);
#endif
}
}

AARRTT (unauthenticated)
Jun 24, 2016

any help email angelobarrantes2311@gmail.com please

darran
Jul 17, 2016

AARRTT you will need to modify the noteOn() and noteOff() functions where it calls Serial.write() to send the channel, pitch, and velocity, and replace them the example from the midi_usb_demo.pde sketch that fill in the t_midiMsg structure with the data and sends that instead.

E.g.:

Replace

Serial.write(channel);
Serial.write(pitch);
Serial.write(velocity);

with the following for noteOn():
t_midiMsg msg = { MIDI_COMMAND_NOTE_ON, channel & 0xF + 1, pitch, velocity };
Serial.write((uint8_t *)&msg, sizeof(msg);

and the following for noteOff():
t_midiMsg msg = { MIDI_COMMAND_NOTE_OFF, channel & 0xF + 1, pitch, velocity };
Serial.write((uint8_t *)&msg, sizeof(msg);

Copy in the definitions for MIDI_COMMAND_NOTE_OFF, MIDI_COMMAND_NOTE_ON, and t_midiMsg from the example sketch..

Michael (unauthenticated)
Jul 29, 2016

Hello,
i m working whit this GREAT firmware on arduino mega i can easily send and receive classic midi messages
(eg: 80- E0 / 1-16 / 1-7F / 1-7F ) but i'd like to send and receive sysex,(aboput 14 octet) i have tried but not result.
Is it possible with thIs firmware ?
Thanks

Michael (unauthenticated)
Jul 31, 2016

The sysex message begin by 0xF0 (240 dec) is there a filter in the firmware until 0xEF ?

Michael (unauthenticated)
Jul 31, 2016

Sorry i forgot to ask you if it's possible to use a t_midiMsg with 15 variables (4 in the regular use)
Thank you