Move MIDI code out of tmk_core (#19704)

15 files changed, 2506 insertions, 0 deletions

diff --git a/quantum/midi/Config/LUFAConfig.h b/quantum/midi/Config/LUFAConfig.h
new file mode 100644
index 0000000000..dead96de78
--- /dev/null
+++ b/quantum/midi/Config/LUFAConfig.h
@@ -0,0 +1,91 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2012.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaim all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *  \brief LUFA Library Configuration Header File
+ *
+ *  This header file is used to configure LUFA's compile time options,
+ *  as an alternative to the compile time constants supplied through
+ *  a makefile.
+ *
+ *  For information on what each token does, refer to the LUFA
+ *  manual section "Summary of Compile Tokens".
+ */
+
+#pragma once
+
+#if (ARCH == ARCH_AVR8)
+
+/* Non-USB Related Configuration Tokens: */
+//		#define DISABLE_TERMINAL_CODES
+
+/* USB Class Driver Related Tokens: */
+//		#define HID_HOST_BOOT_PROTOCOL_ONLY
+//		#define HID_STATETABLE_STACK_DEPTH       {Insert Value Here}
+//		#define HID_USAGE_STACK_DEPTH            {Insert Value Here}
+//		#define HID_MAX_COLLECTIONS              {Insert Value Here}
+//		#define HID_MAX_REPORTITEMS              {Insert Value Here}
+//		#define HID_MAX_REPORT_IDS               {Insert Value Here}
+//		#define NO_CLASS_DRIVER_AUTOFLUSH
+
+/* General USB Driver Related Tokens: */
+//		#define ORDERED_EP_CONFIG
+#    define USE_STATIC_OPTIONS (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)
+#    define USB_DEVICE_ONLY
+//		#define USB_HOST_ONLY
+//		#define USB_STREAM_TIMEOUT_MS            {Insert Value Here}
+//		#define NO_LIMITED_CONTROLLER_CONNECT
+//		#define NO_SOF_EVENTS
+
+/* USB Device Mode Driver Related Tokens: */
+//		#define USE_RAM_DESCRIPTORS
+#    define USE_FLASH_DESCRIPTORS
+//		#define USE_EEPROM_DESCRIPTORS
+//		#define NO_INTERNAL_SERIAL
+#    define FIXED_CONTROL_ENDPOINT_SIZE 8
+//		#define DEVICE_STATE_AS_GPIOR            {Insert Value Here}
+#    define FIXED_NUM_CONFIGURATIONS 1
+//		#define CONTROL_ONLY_DEVICE
+//		#define INTERRUPT_CONTROL_ENDPOINT
+//		#define NO_DEVICE_REMOTE_WAKEUP
+//		#define NO_DEVICE_SELF_POWER
+
+/* USB Host Mode Driver Related Tokens: */
+//		#define HOST_STATE_AS_GPIOR              {Insert Value Here}
+//		#define USB_HOST_TIMEOUT_MS              {Insert Value Here}
+//		#define HOST_DEVICE_SETTLE_DELAY_MS	     {Insert Value Here}
+//      #define NO_AUTO_VBUS_MANAGEMENT
+//      #define INVERTED_VBUS_ENABLE_LINE
+
+#else
+
+#    error Unsupported architecture for this LUFA configuration file.
+
+#endif
diff --git a/quantum/midi/bytequeue/COPYING b/quantum/midi/bytequeue/COPYING
new file mode 100755
index 0000000000..94a9ed024d
--- /dev/null
+++ b/quantum/midi/bytequeue/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+  A patent license is "discriminatory" if it does not include within
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+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
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+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
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+  If the program does terminal interaction, make it output a short
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+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/quantum/midi/bytequeue/bytequeue.c b/quantum/midi/bytequeue/bytequeue.c
new file mode 100644
index 0000000000..0dd18680f0
--- /dev/null
+++ b/quantum/midi/bytequeue/bytequeue.c
@@ -0,0 +1,64 @@
+// this is a single reader [maybe multiple writer?] byte queue
+// Copyright 2008 Alex Norman
+// writen by Alex Norman
+//
+// This file is part of avr-bytequeue.
+//
+// avr-bytequeue is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-bytequeue is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-bytequeue.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "bytequeue.h"
+#include "interrupt_setting.h"
+
+void bytequeue_init(byteQueue_t* queue, uint8_t* dataArray, byteQueueIndex_t arrayLen) {
+    queue->length = arrayLen;
+    queue->data   = dataArray;
+    queue->start = queue->end = 0;
+}
+
+bool bytequeue_enqueue(byteQueue_t* queue, uint8_t item) {
+    interrupt_setting_t setting = store_and_clear_interrupt();
+    // full
+    if (((queue->end + 1) % queue->length) == queue->start) {
+        restore_interrupt_setting(setting);
+        return false;
+    } else {
+        queue->data[queue->end] = item;
+        queue->end              = (queue->end + 1) % queue->length;
+        restore_interrupt_setting(setting);
+        return true;
+    }
+}
+
+byteQueueIndex_t bytequeue_length(byteQueue_t* queue) {
+    byteQueueIndex_t    len;
+    interrupt_setting_t setting = store_and_clear_interrupt();
+    if (queue->end >= queue->start)
+        len = queue->end - queue->start;
+    else
+        len = (queue->length - queue->start) + queue->end;
+    restore_interrupt_setting(setting);
+    return len;
+}
+
+// we don't need to avoid interrupts if there is only one reader
+uint8_t bytequeue_get(byteQueue_t* queue, byteQueueIndex_t index) {
+    return queue->data[(queue->start + index) % queue->length];
+}
+
+// we just update the start index to remove elements
+void bytequeue_remove(byteQueue_t* queue, byteQueueIndex_t numToRemove) {
+    interrupt_setting_t setting = store_and_clear_interrupt();
+    queue->start                = (queue->start + numToRemove) % queue->length;
+    restore_interrupt_setting(setting);
+}
diff --git a/quantum/midi/bytequeue/bytequeue.h b/quantum/midi/bytequeue/bytequeue.h
new file mode 100644
index 0000000000..29d15abbd3
--- /dev/null
+++ b/quantum/midi/bytequeue/bytequeue.h
@@ -0,0 +1,55 @@
+// this is a single reader [maybe multiple writer?] byte queue
+// Copyright 2008 Alex Norman
+// writen by Alex Norman
+//
+// This file is part of avr-bytequeue.
+//
+// avr-bytequeue is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-bytequeue is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-bytequeue.  If not, see <http://www.gnu.org/licenses/>.
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+typedef uint8_t byteQueueIndex_t;
+
+typedef struct {
+    byteQueueIndex_t start;
+    byteQueueIndex_t end;
+    byteQueueIndex_t length;
+    uint8_t*         data;
+} byteQueue_t;
+
+// you must have a queue, an array of data which the queue will use, and the length of that array
+void bytequeue_init(byteQueue_t* queue, uint8_t* dataArray, byteQueueIndex_t arrayLen);
+
+// add an item to the queue, returns false if the queue is full
+bool bytequeue_enqueue(byteQueue_t* queue, uint8_t item);
+
+// get the length of the queue
+byteQueueIndex_t bytequeue_length(byteQueue_t* queue);
+
+// this grabs data at the index given [starting at queue->start]
+uint8_t bytequeue_get(byteQueue_t* queue, byteQueueIndex_t index);
+
+// update the index in the queue to reflect data that has been dealt with
+void bytequeue_remove(byteQueue_t* queue, byteQueueIndex_t numToRemove);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/quantum/midi/bytequeue/interrupt_setting.c b/quantum/midi/bytequeue/interrupt_setting.c
new file mode 100644
index 0000000000..d9c0035946
--- /dev/null
+++ b/quantum/midi/bytequeue/interrupt_setting.c
@@ -0,0 +1,47 @@
+// Copyright 20010 Alex Norman
+// writen by Alex Norman
+//
+// This file is part of avr-bytequeue.
+//
+// avr-bytequeue is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-bytequeue is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-bytequeue.  If not, see <http://www.gnu.org/licenses/>.
+
+// AVR specific code
+// should be able to port to other systems by simply providing chip specific
+// implementations of the typedef and these functions
+
+#include "interrupt_setting.h"
+#if defined(__AVR__)
+#    include <avr/interrupt.h>
+
+interrupt_setting_t store_and_clear_interrupt(void) {
+    uint8_t sreg = SREG;
+    cli();
+    return sreg;
+}
+
+void restore_interrupt_setting(interrupt_setting_t setting) {
+    SREG = setting;
+}
+#elif defined(__arm__)
+#    include <ch.h>
+
+interrupt_setting_t store_and_clear_interrupt(void) {
+    chSysLock();
+    return 0;
+}
+
+void restore_interrupt_setting(interrupt_setting_t setting) {
+    chSysUnlock();
+}
+#endif
diff --git a/quantum/midi/bytequeue/interrupt_setting.h b/quantum/midi/bytequeue/interrupt_setting.h
new file mode 100644
index 0000000000..78294f0765
--- /dev/null
+++ b/quantum/midi/bytequeue/interrupt_setting.h
@@ -0,0 +1,35 @@
+// Copyright 20010 Alex Norman
+// writen by Alex Norman
+//
+// This file is part of avr-bytequeue.
+//
+// avr-bytequeue is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-bytequeue is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-bytequeue.  If not, see <http://www.gnu.org/licenses/>.
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <inttypes.h>
+
+// AVR specific typedef
+typedef uint8_t interrupt_setting_t;
+
+interrupt_setting_t store_and_clear_interrupt(void);
+void                restore_interrupt_setting(interrupt_setting_t setting);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/quantum/midi/midi.c b/quantum/midi/midi.c
new file mode 100644
index 0000000000..1ba3e73a40
--- /dev/null
+++ b/quantum/midi/midi.c
@@ -0,0 +1,247 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "midi.h"
+#include <string.h> //for memcpy
+
+#ifndef MIN
+#    define MIN(x, y) (((x) < (y)) ? (x) : (y))
+#endif
+
+#ifndef NULL
+#    define NULL 0
+#endif
+
+bool midi_is_statusbyte(uint8_t theByte) {
+    return (bool)(theByte & MIDI_STATUSMASK);
+}
+
+bool midi_is_realtime(uint8_t theByte) {
+    return (theByte >= MIDI_CLOCK);
+}
+
+midi_packet_length_t midi_packet_length(uint8_t status) {
+    switch (status & 0xF0) {
+        case MIDI_CC:
+        case MIDI_NOTEON:
+        case MIDI_NOTEOFF:
+        case MIDI_AFTERTOUCH:
+        case MIDI_PITCHBEND:
+            return THREE;
+        case MIDI_PROGCHANGE:
+        case MIDI_CHANPRESSURE:
+        case MIDI_SONGSELECT:
+            return TWO;
+        case 0xF0:
+            switch (status) {
+                case MIDI_CLOCK:
+                case MIDI_TICK:
+                case MIDI_START:
+                case MIDI_CONTINUE:
+                case MIDI_STOP:
+                case MIDI_ACTIVESENSE:
+                case MIDI_RESET:
+                case MIDI_TUNEREQUEST:
+                    return ONE;
+                case MIDI_SONGPOSITION:
+                    return THREE;
+                case MIDI_TC_QUARTERFRAME:
+                case MIDI_SONGSELECT:
+                    return TWO;
+                case SYSEX_END:
+                case SYSEX_BEGIN:
+                default:
+                    return UNDEFINED;
+            }
+        default:
+            return UNDEFINED;
+    }
+}
+
+void midi_send_cc(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t val) {
+    // CC Status: 0xB0 to 0xBF where the low nibble is the MIDI channel.
+    // CC Data: Controller Num, Controller Val
+    device->send_func(device, 3, MIDI_CC | (chan & MIDI_CHANMASK), num & 0x7F, val & 0x7F);
+}
+
+void midi_send_noteon(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t vel) {
+    // Note Data: Note Num, Note Velocity
+    device->send_func(device, 3, MIDI_NOTEON | (chan & MIDI_CHANMASK), num & 0x7F, vel & 0x7F);
+}
+
+void midi_send_noteoff(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t vel) {
+    // Note Data: Note Num, Note Velocity
+    device->send_func(device, 3, MIDI_NOTEOFF | (chan & MIDI_CHANMASK), num & 0x7F, vel & 0x7F);
+}
+
+void midi_send_aftertouch(MidiDevice* device, uint8_t chan, uint8_t note_num, uint8_t amt) {
+    device->send_func(device, 3, MIDI_AFTERTOUCH | (chan & MIDI_CHANMASK), note_num & 0x7F, amt & 0x7F);
+}
+
+// XXX does this work right?
+// amt in range -0x2000, 0x1fff
+// uAmt should be in range..
+// 0x0000 to 0x3FFF
+void midi_send_pitchbend(MidiDevice* device, uint8_t chan, int16_t amt) {
+    uint16_t uAmt;
+    // check range
+    if (amt > 0x1fff) {
+        uAmt = 0x3FFF;
+    } else if (amt < -0x2000) {
+        uAmt = 0;
+    } else {
+        uAmt = amt + 0x2000;
+    }
+    device->send_func(device, 3, MIDI_PITCHBEND | (chan & MIDI_CHANMASK), uAmt & 0x7F, (uAmt >> 7) & 0x7F);
+}
+
+void midi_send_programchange(MidiDevice* device, uint8_t chan, uint8_t num) {
+    device->send_func(device, 2, MIDI_PROGCHANGE | (chan & MIDI_CHANMASK), num & 0x7F, 0);
+}
+
+void midi_send_channelpressure(MidiDevice* device, uint8_t chan, uint8_t amt) {
+    device->send_func(device, 2, MIDI_CHANPRESSURE | (chan & MIDI_CHANMASK), amt & 0x7F, 0);
+}
+
+void midi_send_clock(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_CLOCK, 0, 0);
+}
+
+void midi_send_tick(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_TICK, 0, 0);
+}
+
+void midi_send_start(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_START, 0, 0);
+}
+
+void midi_send_continue(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_CONTINUE, 0, 0);
+}
+
+void midi_send_stop(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_STOP, 0, 0);
+}
+
+void midi_send_activesense(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_ACTIVESENSE, 0, 0);
+}
+
+void midi_send_reset(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_RESET, 0, 0);
+}
+
+void midi_send_tcquarterframe(MidiDevice* device, uint8_t time) {
+    device->send_func(device, 2, MIDI_TC_QUARTERFRAME, time & 0x7F, 0);
+}
+
+// XXX is this right?
+void midi_send_songposition(MidiDevice* device, uint16_t pos) {
+    device->send_func(device, 3, MIDI_SONGPOSITION, pos & 0x7F, (pos >> 7) & 0x7F);
+}
+
+void midi_send_songselect(MidiDevice* device, uint8_t song) {
+    device->send_func(device, 2, MIDI_SONGSELECT, song & 0x7F, 0);
+}
+
+void midi_send_tunerequest(MidiDevice* device) {
+    device->send_func(device, 1, MIDI_TUNEREQUEST, 0, 0);
+}
+
+void midi_send_byte(MidiDevice* device, uint8_t b) {
+    device->send_func(device, 1, b, 0, 0);
+}
+
+void midi_send_data(MidiDevice* device, uint16_t count, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
+    // ensure that the count passed along is always 3 or lower
+    if (count > 3) {
+        // TODO how to do this correctly?
+    }
+    device->send_func(device, count, byte0, byte1, byte2);
+}
+
+void midi_send_array(MidiDevice* device, uint16_t count, uint8_t* array) {
+    uint16_t i;
+    for (i = 0; i < count; i += 3) {
+        uint8_t  b[3]    = {0, 0, 0};
+        uint16_t to_send = count - i;
+        to_send          = (to_send > 3) ? 3 : to_send;
+        memcpy(b, array + i, to_send);
+        midi_send_data(device, to_send, b[0], b[1], b[2]);
+    }
+}
+
+void midi_register_cc_callback(MidiDevice* device, midi_three_byte_func_t func) {
+    device->input_cc_callback = func;
+}
+
+void midi_register_noteon_callback(MidiDevice* device, midi_three_byte_func_t func) {
+    device->input_noteon_callback = func;
+}
+
+void midi_register_noteoff_callback(MidiDevice* device, midi_three_byte_func_t func) {
+    device->input_noteoff_callback = func;
+}
+
+void midi_register_aftertouch_callback(MidiDevice* device, midi_three_byte_func_t func) {
+    device->input_aftertouch_callback = func;
+}
+
+void midi_register_pitchbend_callback(MidiDevice* device, midi_three_byte_func_t func) {
+    device->input_pitchbend_callback = func;
+}
+
+void midi_register_songposition_callback(MidiDevice* device, midi_three_byte_func_t func) {
+    device->input_songposition_callback = func;
+}
+
+void midi_register_progchange_callback(MidiDevice* device, midi_two_byte_func_t func) {
+    device->input_progchange_callback = func;
+}
+
+void midi_register_chanpressure_callback(MidiDevice* device, midi_two_byte_func_t func) {
+    device->input_chanpressure_callback = func;
+}
+
+void midi_register_songselect_callback(MidiDevice* device, midi_two_byte_func_t func) {
+    device->input_songselect_callback = func;
+}
+
+void midi_register_tc_quarterframe_callback(MidiDevice* device, midi_two_byte_func_t func) {
+    device->input_tc_quarterframe_callback = func;
+}
+
+void midi_register_realtime_callback(MidiDevice* device, midi_one_byte_func_t func) {
+    device->input_realtime_callback = func;
+}
+
+void midi_register_tunerequest_callback(MidiDevice* device, midi_one_byte_func_t func) {
+    device->input_tunerequest_callback = func;
+}
+
+void midi_register_sysex_callback(MidiDevice* device, midi_sysex_func_t func) {
+    device->input_sysex_callback = func;
+}
+
+void midi_register_fallthrough_callback(MidiDevice* device, midi_var_byte_func_t func) {
+    device->input_fallthrough_callback = func;
+}
+
+void midi_register_catchall_callback(MidiDevice* device, midi_var_byte_func_t func) {
+    device->input_catchall_callback = func;
+}
diff --git a/quantum/midi/midi.h b/quantum/midi/midi.h
new file mode 100644
index 0000000000..34547077e4
--- /dev/null
+++ b/quantum/midi/midi.h
@@ -0,0 +1,487 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @file
+ * @brief The main midi functions
+ *
+ * This file includes all of the functions you need to set up and process a
+ * midi device, send midi, and register midi callbacks.
+ *
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "midi_device.h"
+#include "midi_function_types.h"
+
+/**
+ * @defgroup midi_device_setup_process Device initialization and processing
+ * @brief These are method that you must use to initialize and run a device
+ *
+ * @{
+ */
+
+/**
+ * @brief Initialize a device
+ *
+ * You must call this before using the device in question.
+ *
+ * @param device the device to initialize
+ */
+void midi_device_init(MidiDevice* device); // [implementation in midi_device.c]
+
+/**
+ * @brief Process input data
+ *
+ * This method drives the input processing, you must call this method frequently
+ * if you expect to have your input callbacks called.
+ *
+ * @param device the device to process
+ */
+void midi_device_process(MidiDevice* device); // [implementation in midi_device.c]
+
+/**@}*/
+
+/**
+ * @defgroup send_functions Midi send functions
+ * @brief These are the functions you use to send midi data through a device.
+ * @{
+ */
+
+/**
+ * @brief Send a control change message (cc) via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param num the cc num
+ * @param val the value of that cc num
+ */
+void midi_send_cc(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t val);
+
+/**
+ * @brief Send a note on message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param num the note number
+ * @param vel the note velocity
+ */
+void midi_send_noteon(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t vel);
+
+/**
+ * @brief Send a note off message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param num the note number
+ * @param vel the note velocity
+ */
+void midi_send_noteoff(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t vel);
+
+/**
+ * @brief Send an after touch message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param note_num the note number
+ * @param amt the after touch amount
+ */
+void midi_send_aftertouch(MidiDevice* device, uint8_t chan, uint8_t note_num, uint8_t amt);
+
+/**
+ * @brief Send a pitch bend message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param amt the bend amount range: -8192..8191, 0 means no bend
+ */
+void midi_send_pitchbend(MidiDevice* device, uint8_t chan, int16_t amt); // range -8192, 8191
+
+/**
+ * @brief Send a program change message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param num the program to change to
+ */
+void midi_send_programchange(MidiDevice* device, uint8_t chan, uint8_t num);
+
+/**
+ * @brief Send a channel pressure message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param chan the channel to send on, 0-15
+ * @param amt the amount of channel pressure
+ */
+void midi_send_channelpressure(MidiDevice* device, uint8_t chan, uint8_t amt);
+
+/**
+ * @brief Send a clock message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_clock(MidiDevice* device);
+
+/**
+ * @brief Send a tick message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_tick(MidiDevice* device);
+
+/**
+ * @brief Send a start message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_start(MidiDevice* device);
+
+/**
+ * @brief Send a continue message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_continue(MidiDevice* device);
+
+/**
+ * @brief Send a stop message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_stop(MidiDevice* device);
+
+/**
+ * @brief Send an active sense message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_activesense(MidiDevice* device);
+
+/**
+ * @brief Send a reset message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_reset(MidiDevice* device);
+
+/**
+ * @brief Send a tc quarter frame message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param time the time of this quarter frame, range 0..16383
+ */
+void midi_send_tcquarterframe(MidiDevice* device, uint8_t time);
+
+/**
+ * @brief Send a song position message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param pos the song position
+ */
+void midi_send_songposition(MidiDevice* device, uint16_t pos);
+
+/**
+ * @brief Send a song select message via the given device.
+ *
+ * @param device the device to use for sending
+ * @param song the song to select
+ */
+void midi_send_songselect(MidiDevice* device, uint8_t song);
+
+/**
+ * @brief Send a tune request message via the given device.
+ *
+ * @param device the device to use for sending
+ */
+void midi_send_tunerequest(MidiDevice* device);
+
+/**
+ * @brief Send a byte via the given device.
+ *
+ * This is a generic method for sending data via the given midi device.
+ * This would be useful for sending sysex data or messages that are not
+ * implemented in this API, if there are any.  Please contact the author
+ * if you find some so we can add them.
+ *
+ * @param device the device to use for sending
+ * @param b the byte to send
+ */
+void midi_send_byte(MidiDevice* device, uint8_t b);
+
+/**
+ * @brief Send up to 3 bytes of data
+ *
+ * % 4 is applied to count so that you can use this to pass sysex through
+ *
+ * @param device the device to use for sending
+ * @param count the count of bytes to send, %4 is applied
+ * @param byte0 the first byte
+ * @param byte1 the second byte, ignored if cnt % 4 != 2
+ * @param byte2 the third byte, ignored if cnt % 4 != 3
+ */
+void midi_send_data(MidiDevice* device, uint16_t count, uint8_t byte0, uint8_t byte1, uint8_t byte2);
+
+/**
+ * @brief Send an array of formatted midi data.
+ *
+ * Can be used for sysex.
+ *
+ * @param device the device to use for sending
+ * @param count the count of bytes to send
+ * @param array the array of bytes
+ */
+void midi_send_array(MidiDevice* device, uint16_t count, uint8_t* array);
+
+/**@}*/
+
+/**
+ * @defgroup input_callback_reg Input callback registration functions
+ *
+ * @brief These are the functions you use to register your input callbacks.
+ *
+ * The functions are called when the appropriate midi message is matched on the
+ * associated device's input.
+ *
+ * @{
+ */
+
+// three byte funcs
+
+/**
+ * @brief Register a control change message (cc) callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_cc_callback(MidiDevice* device, midi_three_byte_func_t func);
+
+/**
+ * @brief Register a note on callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_noteon_callback(MidiDevice* device, midi_three_byte_func_t func);
+
+/**
+ * @brief Register a note off callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_noteoff_callback(MidiDevice* device, midi_three_byte_func_t func);
+
+/**
+ * @brief Register an after touch callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+
+void midi_register_aftertouch_callback(MidiDevice* device, midi_three_byte_func_t func);
+
+/**
+ * @brief Register a pitch bend callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_pitchbend_callback(MidiDevice* device, midi_three_byte_func_t func);
+
+/**
+ * @brief Register a song position callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_songposition_callback(MidiDevice* device, midi_three_byte_func_t func);
+
+// two byte funcs
+
+/**
+ * @brief Register a program change callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_progchange_callback(MidiDevice* device, midi_two_byte_func_t func);
+
+/**
+ * @brief Register a channel pressure callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_chanpressure_callback(MidiDevice* device, midi_two_byte_func_t func);
+
+/**
+ * @brief Register a song select callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_songselect_callback(MidiDevice* device, midi_two_byte_func_t func);
+
+/**
+ * @brief Register a tc quarter frame callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_tc_quarterframe_callback(MidiDevice* device, midi_two_byte_func_t func);
+
+// one byte funcs
+
+/**
+ * @brief Register a realtime callback.
+ *
+ * The callback will be called for all of the real time message types.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_realtime_callback(MidiDevice* device, midi_one_byte_func_t func);
+
+/**
+ * @brief Register a tune request callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_tunerequest_callback(MidiDevice* device, midi_one_byte_func_t func);
+
+/**
+ * @brief Register a sysex callback.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_sysex_callback(MidiDevice* device, midi_sysex_func_t func);
+
+/**
+ * @brief Register fall through callback.
+ *
+ * This is only called if a more specific callback is not matched and called.
+ * For instance, if you don't register a note on callback but you get a note on message
+ * the fall through callback will be called, if it is registered.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_fallthrough_callback(MidiDevice* device, midi_var_byte_func_t func);
+
+/**
+ * @brief Register a catch all callback.
+ *
+ * If registered, the catch all callback is called for every message that is
+ * matched, even if a more specific or the fallthrough callback is registered.
+ *
+ * @param device the device associate with
+ * @param func the callback function to register
+ */
+void midi_register_catchall_callback(MidiDevice* device, midi_var_byte_func_t func);
+
+/**@}*/
+
+/**
+ * @defgroup midi_util Device independent utility functions.
+ * @{
+ */
+
+/**
+ * \enum midi_packet_length_t
+ *
+ * An enumeration of the possible packet length values.
+ */
+typedef enum { UNDEFINED = 0, ONE = 1, TWO = 2, THREE = 3 } midi_packet_length_t;
+
+/**
+ * @brief Test to see if the byte given is a status byte
+ * @param theByte the byte to test
+ * @return true if the byte given is a midi status byte
+ */
+bool midi_is_statusbyte(uint8_t theByte);
+
+/**
+ * @brief Test to see if the byte given is a realtime message
+ * @param theByte the byte to test
+ * @return true if it is a realtime message, false otherwise
+ */
+bool midi_is_realtime(uint8_t theByte);
+
+/**
+ * @brief Find the length of the packet associated with the status byte given
+ * @param status the status byte
+ * @return the length of the packet, will return UNDEFINED if the byte is not
+ * a status byte or if it is a sysex status byte
+ */
+midi_packet_length_t midi_packet_length(uint8_t status);
+
+/**@}*/
+
+/**
+ * @defgroup defines Midi status and miscellaneous utility #defines
+ *
+ * @{
+ */
+
+#define SYSEX_BEGIN 0xF0
+#define SYSEX_END 0xF7
+
+// if you and this with a byte and you get anything non-zero
+// it is a status message
+#define MIDI_STATUSMASK 0x80
+// if you and this with a status message that contains channel info,
+// you'll get the channel
+#define MIDI_CHANMASK 0x0F
+
+#define MIDI_CC 0xB0
+#define MIDI_NOTEON 0x90
+#define MIDI_NOTEOFF 0x80
+#define MIDI_AFTERTOUCH 0xA0
+#define MIDI_PITCHBEND 0xE0
+#define MIDI_PROGCHANGE 0xC0
+#define MIDI_CHANPRESSURE 0xD0
+
+// midi realtime
+#define MIDI_CLOCK 0xF8
+#define MIDI_TICK 0xF9
+#define MIDI_START 0xFA
+#define MIDI_CONTINUE 0xFB
+#define MIDI_STOP 0xFC
+#define MIDI_ACTIVESENSE 0xFE
+#define MIDI_RESET 0xFF
+
+#define MIDI_TC_QUARTERFRAME 0xF1
+#define MIDI_SONGPOSITION 0xF2
+#define MIDI_SONGSELECT 0xF3
+#define MIDI_TUNEREQUEST 0xF6
+
+// This ID is for educational or development use only
+#define SYSEX_EDUMANUFID 0x7D
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/quantum/midi/midi_device.c b/quantum/midi/midi_device.c
new file mode 100644
index 0000000000..77c010b156
--- /dev/null
+++ b/quantum/midi/midi_device.c
@@ -0,0 +1,277 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "midi_device.h"
+#include "midi.h"
+
+#ifndef NULL
+#    define NULL 0
+#endif
+
+// forward declarations, internally used to call the callbacks
+void midi_input_callbacks(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2);
+void midi_process_byte(MidiDevice* device, uint8_t input);
+
+void midi_device_init(MidiDevice* device) {
+    device->input_state = IDLE;
+    device->input_count = 0;
+    bytequeue_init(&device->input_queue, device->input_queue_data, MIDI_INPUT_QUEUE_LENGTH);
+
+    // three byte funcs
+    device->input_cc_callback           = NULL;
+    device->input_noteon_callback       = NULL;
+    device->input_noteoff_callback      = NULL;
+    device->input_aftertouch_callback   = NULL;
+    device->input_pitchbend_callback    = NULL;
+    device->input_songposition_callback = NULL;
+
+    // two byte funcs
+    device->input_progchange_callback      = NULL;
+    device->input_chanpressure_callback    = NULL;
+    device->input_songselect_callback      = NULL;
+    device->input_tc_quarterframe_callback = NULL;
+
+    // one byte funcs
+    device->input_realtime_callback    = NULL;
+    device->input_tunerequest_callback = NULL;
+
+    // var byte functions
+    device->input_sysex_callback       = NULL;
+    device->input_fallthrough_callback = NULL;
+    device->input_catchall_callback    = NULL;
+
+    device->pre_input_process_callback = NULL;
+}
+
+void midi_device_input(MidiDevice* device, uint8_t cnt, uint8_t* input) {
+    uint8_t i;
+    for (i = 0; i < cnt; i++)
+        bytequeue_enqueue(&device->input_queue, input[i]);
+}
+
+void midi_device_set_send_func(MidiDevice* device, midi_var_byte_func_t send_func) {
+    device->send_func = send_func;
+}
+
+void midi_device_set_pre_input_process_func(MidiDevice* device, midi_no_byte_func_t pre_process_func) {
+    device->pre_input_process_callback = pre_process_func;
+}
+
+void midi_device_process(MidiDevice* device) {
+    // call the pre_input_process_callback if there is one
+    if (device->pre_input_process_callback) device->pre_input_process_callback(device);
+
+    // pull stuff off the queue and process
+    byteQueueIndex_t len = bytequeue_length(&device->input_queue);
+    uint16_t         i;
+    // TODO limit number of bytes processed?
+    for (i = 0; i < len; i++) {
+        uint8_t val = bytequeue_get(&device->input_queue, 0);
+        midi_process_byte(device, val);
+        bytequeue_remove(&device->input_queue, 1);
+    }
+}
+
+void midi_process_byte(MidiDevice* device, uint8_t input) {
+    if (midi_is_realtime(input)) {
+        // call callback, store and restore state
+        input_state_t state = device->input_state;
+        device->input_state = ONE_BYTE_MESSAGE;
+        midi_input_callbacks(device, 1, input, 0, 0);
+        device->input_state = state;
+    } else if (midi_is_statusbyte(input)) {
+        // store the byte
+        if (device->input_state != SYSEX_MESSAGE) {
+            device->input_buffer[0] = input;
+            device->input_count     = 1;
+        }
+        switch (midi_packet_length(input)) {
+            case ONE:
+                device->input_state = ONE_BYTE_MESSAGE;
+                ;
+                midi_input_callbacks(device, 1, input, 0, 0);
+                device->input_state = IDLE;
+                break;
+            case TWO:
+                device->input_state = TWO_BYTE_MESSAGE;
+                break;
+            case THREE:
+                device->input_state = THREE_BYTE_MESSAGE;
+                break;
+            case UNDEFINED:
+                switch (input) {
+                    case SYSEX_BEGIN:
+                        device->input_state     = SYSEX_MESSAGE;
+                        device->input_buffer[0] = input;
+                        device->input_count     = 1;
+                        break;
+                    case SYSEX_END:
+                        // send what is left in the input buffer, set idle
+                        device->input_buffer[device->input_count % 3] = input;
+                        device->input_count += 1;
+                        // call the callback
+                        midi_input_callbacks(device, device->input_count, device->input_buffer[0], device->input_buffer[1], device->input_buffer[2]);
+                        device->input_state = IDLE;
+                        break;
+                    default:
+                        device->input_state = IDLE;
+                        device->input_count = 0;
+                }
+
+                break;
+            default:
+                device->input_state = IDLE;
+                device->input_count = 0;
+                break;
+        }
+    } else {
+        if (device->input_state != IDLE) {
+            // store the byte
+            device->input_buffer[device->input_count % 3] = input;
+            // increment count
+            uint16_t prev = device->input_count;
+            device->input_count += 1;
+
+            switch (prev % 3) {
+                case 2:
+                    // call callback
+                    midi_input_callbacks(device, device->input_count, device->input_buffer[0], device->input_buffer[1], device->input_buffer[2]);
+                    if (device->input_state != SYSEX_MESSAGE) {
+                        // set to 1, keeping status byte, allowing for running status
+                        device->input_count = 1;
+                    }
+                    break;
+                case 1:
+                    if (device->input_state == TWO_BYTE_MESSAGE) {
+                        // call callback
+                        midi_input_callbacks(device, device->input_count, device->input_buffer[0], device->input_buffer[1], 0);
+                        if (device->input_state != SYSEX_MESSAGE) {
+                            // set to 1, keeping status byte, allowing for running status
+                            device->input_count = 1;
+                        }
+                    }
+                    break;
+                case 0:
+                default:
+                    // one byte messages are dealt with directly
+                    break;
+            }
+        }
+    }
+}
+
+void midi_input_callbacks(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
+    // did we end up calling a callback?
+    bool called = false;
+    if (device->input_state == SYSEX_MESSAGE) {
+        if (device->input_sysex_callback) {
+            const uint16_t start  = ((cnt - 1) / 3) * 3;
+            const uint8_t  length = (cnt - start);
+            uint8_t        data[3];
+            data[0] = byte0;
+            data[1] = byte1;
+            data[2] = byte2;
+            device->input_sysex_callback(device, start, length, data);
+            called = true;
+        }
+    } else {
+        switch (cnt) {
+            case 3: {
+                midi_three_byte_func_t func = NULL;
+                switch (byte0 & 0xF0) {
+                    case MIDI_CC:
+                        func = device->input_cc_callback;
+                        break;
+                    case MIDI_NOTEON:
+                        func = device->input_noteon_callback;
+                        break;
+                    case MIDI_NOTEOFF:
+                        func = device->input_noteoff_callback;
+                        break;
+                    case MIDI_AFTERTOUCH:
+                        func = device->input_aftertouch_callback;
+                        break;
+                    case MIDI_PITCHBEND:
+                        func = device->input_pitchbend_callback;
+                        break;
+                    case 0xF0:
+                        if (byte0 == MIDI_SONGPOSITION) func = device->input_songposition_callback;
+                        break;
+                    default:
+                        break;
+                }
+                if (func) {
+                    // mask off the channel for non song position functions
+                    if (byte0 == MIDI_SONGPOSITION)
+                        func(device, byte0, byte1, byte2);
+                    else
+                        func(device, byte0 & 0x0F, byte1, byte2);
+                    called = true;
+                }
+            } break;
+            case 2: {
+                midi_two_byte_func_t func = NULL;
+                switch (byte0 & 0xF0) {
+                    case MIDI_PROGCHANGE:
+                        func = device->input_progchange_callback;
+                        break;
+                    case MIDI_CHANPRESSURE:
+                        func = device->input_chanpressure_callback;
+                        break;
+                    case 0xF0:
+                        if (byte0 == MIDI_SONGSELECT)
+                            func = device->input_songselect_callback;
+                        else if (byte0 == MIDI_TC_QUARTERFRAME)
+                            func = device->input_tc_quarterframe_callback;
+                        break;
+                    default:
+                        break;
+                }
+                if (func) {
+                    // mask off the channel
+                    if (byte0 == MIDI_SONGSELECT || byte0 == MIDI_TC_QUARTERFRAME)
+                        func(device, byte0, byte1);
+                    else
+                        func(device, byte0 & 0x0F, byte1);
+                    called = true;
+                }
+            } break;
+            case 1: {
+                midi_one_byte_func_t func = NULL;
+                if (midi_is_realtime(byte0))
+                    func = device->input_realtime_callback;
+                else if (byte0 == MIDI_TUNEREQUEST)
+                    func = device->input_tunerequest_callback;
+                if (func) {
+                    func(device, byte0);
+                    called = true;
+                }
+            } break;
+            default:
+                // just in case
+                if (cnt > 3) cnt = 0;
+                break;
+        }
+    }
+
+    // if there is fallthrough default callback and we haven't called a more specific one,
+    // call the fallthrough
+    if (!called && device->input_fallthrough_callback) device->input_fallthrough_callback(device, cnt, byte0, byte1, byte2);
+    // always call the catch all if it exists
+    if (device->input_catchall_callback) device->input_catchall_callback(device, cnt, byte0, byte1, byte2);
+}
diff --git a/quantum/midi/midi_device.h b/quantum/midi/midi_device.h
new file mode 100644
index 0000000000..79e8f7a936
--- /dev/null
+++ b/quantum/midi/midi_device.h
@@ -0,0 +1,148 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @file
+ * @brief Device implementation functions
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup midi_device Functions used when implementing your own midi device.
+ *
+ * You use the functions when you are implementing your own midi device.
+ *
+ * You set a send function to actually send bytes via your device, this method
+ * is called when you call a send function with this device, for instance
+ * midi_send_cc
+ *
+ * You use the midi_device_input to process input data from the device and pass
+ * it through the device's associated callbacks.
+ *
+ * You use the midi_device_set_pre_input_process_func if you want to have a
+ * function called at the beginning of the device's process function, generally
+ * to poll for input and pass that into midi_device_input
+ *
+ * @{
+ */
+
+#include "midi_function_types.h"
+#include "bytequeue/bytequeue.h"
+#define MIDI_INPUT_QUEUE_LENGTH 192
+
+typedef enum { IDLE, ONE_BYTE_MESSAGE = 1, TWO_BYTE_MESSAGE = 2, THREE_BYTE_MESSAGE = 3, SYSEX_MESSAGE } input_state_t;
+
+typedef void (*midi_no_byte_func_t)(MidiDevice* device);
+
+/**
+ * \struct _midi_device
+ *
+ * @brief This structure represents the input and output functions and
+ * processing data for a midi device.
+ *
+ * A device can represent an actual physical device [serial port, usb port] or
+ * something virtual.
+ * You should not need to modify this structure directly.
+ */
+struct _midi_device {
+    // output send function
+    midi_var_byte_func_t send_func;
+
+    //********input callbacks
+    // three byte funcs
+    midi_three_byte_func_t input_cc_callback;
+    midi_three_byte_func_t input_noteon_callback;
+    midi_three_byte_func_t input_noteoff_callback;
+    midi_three_byte_func_t input_aftertouch_callback;
+    midi_three_byte_func_t input_pitchbend_callback;
+    midi_three_byte_func_t input_songposition_callback;
+    // two byte funcs
+    midi_two_byte_func_t input_progchange_callback;
+    midi_two_byte_func_t input_chanpressure_callback;
+    midi_two_byte_func_t input_songselect_callback;
+    midi_two_byte_func_t input_tc_quarterframe_callback;
+    // one byte funcs
+    midi_one_byte_func_t input_realtime_callback;
+    midi_one_byte_func_t input_tunerequest_callback;
+
+    // sysex
+    midi_sysex_func_t input_sysex_callback;
+
+    // only called if more specific callback is not matched
+    midi_var_byte_func_t input_fallthrough_callback;
+    // called if registered, independent of other callbacks
+    midi_var_byte_func_t input_catchall_callback;
+
+    // pre input processing function
+    midi_no_byte_func_t pre_input_process_callback;
+
+    // for internal input processing
+    uint8_t       input_buffer[3];
+    input_state_t input_state;
+    uint16_t      input_count;
+
+    // for queueing data between the input and the processing functions
+    uint8_t     input_queue_data[MIDI_INPUT_QUEUE_LENGTH];
+    byteQueue_t input_queue;
+};
+
+/**
+ * @brief Process input bytes.  This function parses bytes and calls the
+ * appropriate callbacks associated with the given device.  You use this
+ * function if you are creating a custom device and you want to have midi
+ * input.
+ *
+ * @param device the midi device to associate the input with
+ * @param cnt the number of bytes you are processing
+ * @param input the bytes to process
+ */
+void midi_device_input(MidiDevice* device, uint8_t cnt, uint8_t* input);
+
+/**
+ * @brief Set the callback function that will be used for sending output
+ * data bytes.  This is only used if you're creating a custom device.
+ * You'll most likely want the callback function to disable interrupts so
+ * that you can call the various midi send functions without worrying about
+ * locking.
+ *
+ * \param device the midi device to associate this callback with
+ * \param send_func the callback function that will do the sending
+ */
+void midi_device_set_send_func(MidiDevice* device, midi_var_byte_func_t send_func);
+
+/**
+ * @brief Set a callback which is called at the beginning of the
+ * midi_device_process call.  This can be used to poll for input
+ * data and send the data through the midi_device_input function.
+ * You'll probably only use this if you're creating a custom device.
+ *
+ * \param device the midi device to associate this callback with
+ * \param midi_no_byte_func_t the actual callback function
+ */
+void midi_device_set_pre_input_process_func(MidiDevice* device, midi_no_byte_func_t pre_process_func);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/quantum/midi/midi_function_types.h b/quantum/midi/midi_function_types.h
new file mode 100644
index 0000000000..6f98a72981
--- /dev/null
+++ b/quantum/midi/midi_function_types.h
@@ -0,0 +1,47 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * @file
+ * @brief Function signature definitions
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+// forward declaration
+typedef struct _midi_device MidiDevice;
+
+typedef void (*midi_one_byte_func_t)(MidiDevice *device, uint8_t byte);
+typedef void (*midi_two_byte_func_t)(MidiDevice *device, uint8_t byte0, uint8_t byte1);
+typedef void (*midi_three_byte_func_t)(MidiDevice *device, uint8_t byte0, uint8_t byte1, uint8_t byte2);
+// all bytes after count bytes should be ignored
+typedef void (*midi_var_byte_func_t)(MidiDevice *device, uint16_t count, uint8_t byte0, uint8_t byte1, uint8_t byte2);
+
+// the start byte tells you how far into the sysex message you are, the data_length tells you how many bytes data is
+typedef void (*midi_sysex_func_t)(MidiDevice *device, uint16_t start_byte, uint8_t data_length, uint8_t *data);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/quantum/midi/qmk_midi.c b/quantum/midi/qmk_midi.c
new file mode 100644
index 0000000000..f6a5d92281
--- /dev/null
+++ b/quantum/midi/qmk_midi.c
@@ -0,0 +1,135 @@
+#include <LUFA/Drivers/USB/USB.h>
+#include "qmk_midi.h"
+#include "sysex_tools.h"
+#include "midi.h"
+#include "usb_descriptor.h"
+#include "process_midi.h"
+
+/*******************************************************************************
+ * MIDI
+ ******************************************************************************/
+
+MidiDevice midi_device;
+
+#define SYSEX_START_OR_CONT 0x40
+#define SYSEX_ENDS_IN_1 0x50
+#define SYSEX_ENDS_IN_2 0x60
+#define SYSEX_ENDS_IN_3 0x70
+
+#define SYS_COMMON_1 0x50
+#define SYS_COMMON_2 0x20
+#define SYS_COMMON_3 0x30
+
+static void usb_send_func(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
+    MIDI_EventPacket_t event;
+    event.Data1 = byte0;
+    event.Data2 = byte1;
+    event.Data3 = byte2;
+
+    uint8_t cable = 0;
+
+    // if the length is undefined we assume it is a SYSEX message
+    if (midi_packet_length(byte0) == UNDEFINED) {
+        switch (cnt) {
+            case 3:
+                if (byte2 == SYSEX_END)
+                    event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_3);
+                else
+                    event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
+                break;
+            case 2:
+                if (byte1 == SYSEX_END)
+                    event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_2);
+                else
+                    event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
+                break;
+            case 1:
+                if (byte0 == SYSEX_END)
+                    event.Event = MIDI_EVENT(cable, SYSEX_ENDS_IN_1);
+                else
+                    event.Event = MIDI_EVENT(cable, SYSEX_START_OR_CONT);
+                break;
+            default:
+                return; // invalid cnt
+        }
+    } else {
+        // deal with 'system common' messages
+        // TODO are there any more?
+        switch (byte0 & 0xF0) {
+            case MIDI_SONGPOSITION:
+                event.Event = MIDI_EVENT(cable, SYS_COMMON_3);
+                break;
+            case MIDI_SONGSELECT:
+            case MIDI_TC_QUARTERFRAME:
+                event.Event = MIDI_EVENT(cable, SYS_COMMON_2);
+                break;
+            default:
+                event.Event = MIDI_EVENT(cable, byte0);
+                break;
+        }
+    }
+
+    send_midi_packet(&event);
+}
+
+static void usb_get_midi(MidiDevice* device) {
+    MIDI_EventPacket_t event;
+    while (recv_midi_packet(&event)) {
+        midi_packet_length_t length = midi_packet_length(event.Data1);
+        uint8_t              input[3];
+        input[0] = event.Data1;
+        input[1] = event.Data2;
+        input[2] = event.Data3;
+        if (length == UNDEFINED) {
+            // sysex
+            if (event.Event == MIDI_EVENT(0, SYSEX_START_OR_CONT) || event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_3)) {
+                length = 3;
+            } else if (event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_2)) {
+                length = 2;
+            } else if (event.Event == MIDI_EVENT(0, SYSEX_ENDS_IN_1)) {
+                length = 1;
+            } else {
+                // XXX what to do?
+            }
+        }
+
+        // pass the data to the device input function
+        if (length != UNDEFINED) midi_device_input(device, length, input);
+    }
+}
+
+static void fallthrough_callback(MidiDevice* device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
+#ifdef AUDIO_ENABLE
+    if (cnt == 3) {
+        switch (byte0 & 0xF0) {
+            case MIDI_NOTEON:
+                play_note(((double)261.6) * pow(2.0, -4.0) * pow(2.0, (byte1 & 0x7F) / 12.0), (byte2 & 0x7F) / 8);
+                break;
+            case MIDI_NOTEOFF:
+                stop_note(((double)261.6) * pow(2.0, -4.0) * pow(2.0, (byte1 & 0x7F) / 12.0));
+                break;
+        }
+    }
+    if (byte0 == MIDI_STOP) {
+        stop_all_notes();
+    }
+#endif
+}
+
+static void cc_callback(MidiDevice* device, uint8_t chan, uint8_t num, uint8_t val) {
+    // sending it back on the next channel
+    // midi_send_cc(device, (chan + 1) % 16, num, val);
+}
+
+void midi_init(void);
+
+void setup_midi(void) {
+#ifdef MIDI_ADVANCED
+    midi_init();
+#endif
+    midi_device_init(&midi_device);
+    midi_device_set_send_func(&midi_device, usb_send_func);
+    midi_device_set_pre_input_process_func(&midi_device, usb_get_midi);
+    midi_register_fallthrough_callback(&midi_device, fallthrough_callback);
+    midi_register_cc_callback(&midi_device, cc_callback);
+}
diff --git a/quantum/midi/qmk_midi.h b/quantum/midi/qmk_midi.h
new file mode 100644
index 0000000000..819087a405
--- /dev/null
+++ b/quantum/midi/qmk_midi.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#ifdef MIDI_ENABLE
+#    include "midi.h"
+#    include <LUFA/Drivers/USB/USB.h>
+extern MidiDevice midi_device;
+void              setup_midi(void);
+void              send_midi_packet(MIDI_EventPacket_t* event);
+bool              recv_midi_packet(MIDI_EventPacket_t* const event);
+#endif
diff --git a/quantum/midi/sysex_tools.c b/quantum/midi/sysex_tools.c
new file mode 100644
index 0000000000..c9a9d03285
--- /dev/null
+++ b/quantum/midi/sysex_tools.c
@@ -0,0 +1,97 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "sysex_tools.h"
+
+uint16_t sysex_encoded_length(uint16_t decoded_length) {
+    uint8_t remainder = decoded_length % 7;
+    if (remainder)
+        return (decoded_length / 7) * 8 + remainder + 1;
+    else
+        return (decoded_length / 7) * 8;
+}
+
+uint16_t sysex_decoded_length(uint16_t encoded_length) {
+    uint8_t remainder = encoded_length % 8;
+    if (remainder)
+        return (encoded_length / 8) * 7 + remainder - 1;
+    else
+        return (encoded_length / 8) * 7;
+}
+
+uint16_t sysex_encode(uint8_t *encoded, const uint8_t *source, const uint16_t length) {
+    uint16_t encoded_full = length / 7; // number of full 8 byte sections from 7 bytes of input
+    uint16_t i, j;
+
+    // fill out the fully encoded sections
+    for (i = 0; i < encoded_full; i++) {
+        uint16_t encoded_msb_idx = i * 8;
+        uint16_t input_start_idx = i * 7;
+        encoded[encoded_msb_idx] = 0;
+        for (j = 0; j < 7; j++) {
+            uint8_t current = source[input_start_idx + j];
+            encoded[encoded_msb_idx] |= (0x80 & current) >> (1 + j);
+            encoded[encoded_msb_idx + 1 + j] = 0x7F & current;
+        }
+    }
+
+    // fill out the rest if there is any more
+    uint8_t remainder = length % 7;
+    if (remainder) {
+        uint16_t encoded_msb_idx = encoded_full * 8;
+        uint16_t input_start_idx = encoded_full * 7;
+        encoded[encoded_msb_idx] = 0;
+        for (j = 0; j < remainder; j++) {
+            uint8_t current = source[input_start_idx + j];
+            encoded[encoded_msb_idx] |= (0x80 & current) >> (1 + j);
+            encoded[encoded_msb_idx + 1 + j] = 0x7F & current;
+        }
+        return encoded_msb_idx + remainder + 1;
+    } else {
+        return encoded_full * 8;
+    }
+}
+
+uint16_t sysex_decode(uint8_t *decoded, const uint8_t *source, const uint16_t length) {
+    uint16_t decoded_full = length / 8;
+    uint16_t i, j;
+
+    if (length < 2) return 0;
+
+    // fill out the fully encoded sections
+    for (i = 0; i < decoded_full; i++) {
+        uint16_t encoded_msb_idx    = i * 8;
+        uint16_t output_start_index = i * 7;
+        for (j = 0; j < 7; j++) {
+            decoded[output_start_index + j] = 0x7F & source[encoded_msb_idx + j + 1];
+            decoded[output_start_index + j] |= (0x80 & (source[encoded_msb_idx] << (1 + j)));
+        }
+    }
+    uint8_t remainder = length % 8;
+    if (remainder) {
+        uint16_t encoded_msb_idx    = decoded_full * 8;
+        uint16_t output_start_index = decoded_full * 7;
+        for (j = 0; j < (remainder - 1); j++) {
+            decoded[output_start_index + j] = 0x7F & source[encoded_msb_idx + j + 1];
+            decoded[output_start_index + j] |= (0x80 & (source[encoded_msb_idx] << (1 + j)));
+        }
+        return decoded_full * 7 + remainder - 1;
+    } else {
+        return decoded_full * 7;
+    }
+}
diff --git a/quantum/midi/sysex_tools.h b/quantum/midi/sysex_tools.h
new file mode 100644
index 0000000000..7d7f10d24e
--- /dev/null
+++ b/quantum/midi/sysex_tools.h
@@ -0,0 +1,92 @@
+// midi for embedded chips,
+// Copyright 2010 Alex Norman
+//
+// This file is part of avr-midi.
+//
+// avr-midi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+//
+// avr-midi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with avr-midi.  If not, see <http://www.gnu.org/licenses/>.
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <inttypes.h>
+
+/**
+ * @file
+ * @brief Sysex utility functions
+ *
+ * These functions are for converting data to and from a "midi-safe" format,
+ * which can be use to send data with sysex messages.  Sysex messages may only
+ * contain data where the to bit is not set.
+ *
+ * An "encoded" midi message is one that contains all of the data from its
+ * original state, but does not have any of the top bits set.
+ *
+ * Every 7 bytes of decoded data is converted into 8 bytes of encoded data and
+ * visa-versa.  If you'd like to operate on small segments, make sure that you
+ * encode in 7 byte increments and decode in 8 byte increments.
+ *
+ */
+
+/** @defgroup sysex_tools Sysex utility functions
+ * @{
+ */
+
+/**
+ * @brief Compute the length of a message after it is encoded.
+ *
+ * @param decoded_length The length, in bytes, of the message to encode.
+ *
+ * @return The length, in bytes, of the message after encodeing.
+ */
+uint16_t sysex_encoded_length(uint16_t decoded_length);
+
+/**
+ * @brief Compute the length of a message after it is decoded.
+ *
+ * @param encoded_length The length, in bytes, of the encoded message.
+ *
+ * @return The length, in bytes, of the message after it is decoded.
+ */
+uint16_t sysex_decoded_length(uint16_t encoded_length);
+
+/**
+ * @brief Encode data so that it can be transmitted safely in a sysex message.
+ *
+ * @param encoded The output data buffer, must be at least sysex_encoded_length(length) bytes long.
+ * @param source The input buffer of data to be encoded.
+ * @param length The number of bytes from the input buffer to encode.
+ *
+ * @return number of bytes encoded.
+ */
+uint16_t sysex_encode(uint8_t *encoded, const uint8_t *source, uint16_t length);
+
+/**
+ * @brief Decode encoded data.
+ *
+ * @param decoded The output data buffer, must be at least sysex_decoded_length(length) bytes long.
+ * @param source The input buffer of data to be decoded.
+ * @param length The number of bytes from the input buffer to decode.
+ *
+ * @return number of bytes decoded.
+ */
+uint16_t sysex_decode(uint8_t *decoded, const uint8_t *source, uint16_t length);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif