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diff --git a/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c b/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c
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+++ b/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c
@@ -0,0 +1,252 @@
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2017.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2017 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 disclaims 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
+ *
+ * Main source file for the MIDI demo. This file contains the main tasks of
+ * the demo and is responsible for the initial application hardware configuration.
+ */
+
+#include "MIDIToneGenerator.h"
+
+/** LUFA MIDI Class driver interface configuration and state information. This structure is
+ * passed to all MIDI Class driver functions, so that multiple instances of the same class
+ * within a device can be differentiated from one another.
+ */
+USB_ClassInfo_MIDI_Device_t Keyboard_MIDI_Interface =
+ {
+ .Config =
+ {
+ .StreamingInterfaceNumber = INTERFACE_ID_AudioStream,
+ .DataINEndpoint =
+ {
+ .Address = MIDI_STREAM_IN_EPADDR,
+ .Size = MIDI_STREAM_EPSIZE,
+ .Banks = 1,
+ },
+ .DataOUTEndpoint =
+ {
+ .Address = MIDI_STREAM_OUT_EPADDR,
+ .Size = MIDI_STREAM_EPSIZE,
+ .Banks = 1,
+ },
+ },
+ };
+
+/** 8-bit 256 entry Sine Wave lookup table */
+static const uint8_t SineTable[256] =
+{
+ 128, 131, 134, 137, 140, 143, 146, 149, 152, 156, 159, 162, 165, 168, 171, 174,
+ 176, 179, 182, 185, 188, 191, 193, 196, 199, 201, 204, 206, 209, 211, 213, 216,
+ 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 237, 239, 240, 242, 243, 245,
+ 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 254, 255, 255, 255, 255, 255,
+ 255, 255, 255, 255, 255, 255, 254, 254, 253, 252, 252, 251, 250, 249, 248, 247,
+ 246, 245, 243, 242, 240, 239, 237, 236, 234, 232, 230, 228, 226, 224, 222, 220,
+ 218, 216, 213, 211, 209, 206, 204, 201, 199, 196, 193, 191, 188, 185, 182, 179,
+ 176, 174, 171, 168, 165, 162, 159, 156, 152, 149, 146, 143, 140, 137, 134, 131,
+ 128, 124, 121, 118, 115, 112, 109, 106, 103, 99, 96, 93, 90, 87, 84, 81,
+ 79, 76, 73, 70, 67, 64, 62, 59, 56, 54, 51, 49, 46, 44, 42, 39,
+ 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 18, 16, 15, 13, 12, 10,
+ 9, 8, 7, 6, 5, 4, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8,
+ 9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35,
+ 37, 39, 42, 44, 46, 49, 51, 54, 56, 59, 62, 64, 67, 70, 73, 76,
+ 79, 81, 84, 87, 90, 93, 96, 99, 103, 106, 109, 112, 115, 118, 121, 124,
+};
+
+/** Array of structures describing each note being generated */
+static DDSNoteData NoteData[MAX_SIMULTANEOUS_NOTES];
+
+
+/** Main program entry point. This routine contains the overall program flow, including initial
+ * setup of all components and the main program loop.
+ */
+int main(void)
+{
+ SetupHardware();
+
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+ GlobalInterruptEnable();
+
+ for (;;)
+ {
+ MIDI_EventPacket_t ReceivedMIDIEvent;
+ if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent))
+ {
+ if ((ReceivedMIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
+ {
+ DDSNoteData* LRUNoteStruct = &NoteData[0];
+
+ /* Find a free entry in the note table to use for the note being turned on */
+ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
+ {
+ /* Check if the note is unused */
+ if (!(NoteData[i].Pitch))
+ {
+ /* If a note is unused, it's age is essentially infinite - always prefer unused note entries */
+ LRUNoteStruct = &NoteData[i];
+ break;
+ }
+ else if (NoteData[i].LRUAge >= LRUNoteStruct->LRUAge)
+ {
+ /* If an older entry that the current entry has been found, prefer overwriting that one */
+ LRUNoteStruct = &NoteData[i];
+ }
+
+ NoteData[i].LRUAge++;
+ }
+
+ /* Update the oldest note entry with the new note data and reset its age */
+ LRUNoteStruct->Pitch = ReceivedMIDIEvent.Data2;
+ LRUNoteStruct->TableIncrement = (uint32_t)(BASE_INCREMENT * SCALE_FACTOR) +
+ ((uint32_t)(BASE_INCREMENT * NOTE_OCTIVE_RATIO * SCALE_FACTOR) *
+ (ReceivedMIDIEvent.Data2 - BASE_PITCH_INDEX));
+ LRUNoteStruct->TablePosition = 0;
+ LRUNoteStruct->LRUAge = 0;
+
+ /* Turn on indicator LED to indicate note generation activity */
+ LEDs_SetAllLEDs(LEDS_LED1);
+ }
+ else if ((ReceivedMIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_OFF)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
+ {
+ bool FoundActiveNote = false;
+
+ /* Find the note in the note table to turn off */
+ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
+ {
+ if (NoteData[i].Pitch == ReceivedMIDIEvent.Data2)
+ NoteData[i].Pitch = 0;
+ else if (NoteData[i].Pitch)
+ FoundActiveNote = true;
+ }
+
+ /* If all notes off, turn off the indicator LED */
+ if (!(FoundActiveNote))
+ LEDs_SetAllLEDs(LEDS_NO_LEDS);
+ }
+ }
+
+ MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
+ USB_USBTask();
+ }
+}
+
+/** ISR to handle the reloading of the PWM timer with the next sample. */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)
+{
+ uint16_t MixedSample = 0;
+
+ /* Sum together all the active notes to form a single sample */
+ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
+ {
+ /* A non-zero pitch indicates the note is active */
+ if (NoteData[i].Pitch)
+ {
+ /* Use the top 8 bits of the table position as the sample table index */
+ uint8_t TableIndex = (NoteData[i].TablePosition >> 24);
+
+ /* Add the new tone sample to the accumulator and increment the table position */
+ MixedSample += SineTable[TableIndex];
+ NoteData[i].TablePosition += NoteData[i].TableIncrement;
+ }
+ }
+
+ /* Output clamped mixed sample value to the PWM */
+ OCR3A = (MixedSample <= 0xFF) ? MixedSample : 0xFF;
+}
+
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
+void SetupHardware(void)
+{
+#if (ARCH == ARCH_AVR8)
+ /* Disable watchdog if enabled by bootloader/fuses */
+ MCUSR &= ~(1 << WDRF);
+ wdt_disable();
+
+ /* Disable clock division */
+ clock_prescale_set(clock_div_1);
+#endif
+
+ /* Hardware Initialization */
+ LEDs_Init();
+ USB_Init();
+
+ /* Sample reload timer initialization */
+ TIMSK0 = (1 << OCIE0A);
+ OCR0A = (VIRTUAL_SAMPLE_TABLE_SIZE / 8);
+ TCCR0A = (1 << WGM01); // CTC mode
+ TCCR0B = (1 << CS01); // Fcpu/8 speed
+
+ /* Set speaker as output */
+ DDRC |= (1 << 6);
+
+ /* PWM speaker timer initialization */
+ TCCR3A = ((1 << WGM31) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
+ TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, Fcpu speed
+}
+
+/** Event handler for the library USB Connection event. */
+void EVENT_USB_Device_Connect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+
+ /* Set speaker as output */
+ DDRC |= (1 << 6);
+}
+
+/** Event handler for the library USB Disconnection event. */
+void EVENT_USB_Device_Disconnect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+ /* Disable any notes currently being played */
+ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
+ NoteData[i].Pitch = 0;
+
+ /* Set speaker as input to reduce current draw */
+ DDRC &= ~(1 << 6);
+}
+
+/** Event handler for the library USB Configuration Changed event. */
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+ bool ConfigSuccess = true;
+
+ ConfigSuccess &= MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface);
+
+ LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
+}
+
+/** Event handler for the library USB Control Request event. */
+void EVENT_USB_Device_ControlRequest(void)
+{
+ MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);
+}
+
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