Merge branch 'master' into eco-keyboard

1 files changed, 252 insertions, 0 deletions

diff --git a/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c b/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c
new file mode 100644
index 0000000000..6d9e08a19d
--- /dev/null
+++ 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);
+}
+