Added incomplete MIDIToneGenerator project.

1 files changed, 209 insertions, 0 deletions

diff --git a/Projects/Incomplete/MIDIToneGenerator/MIDIToneGenerator.c b/Projects/Incomplete/MIDIToneGenerator/MIDIToneGenerator.c
new file mode 100644
index 000000000..8d5cd05c9
--- /dev/null
+++ b/Projects/Incomplete/MIDIToneGenerator/MIDIToneGenerator.c
@@ -0,0 +1,209 @@
+/*

+             LUFA Library

+     Copyright (C) Dean Camera, 2010.

+              

+  dean [at] fourwalledcubicle [dot] com

+      www.fourwalledcubicle.com

+*/

+

+/*

+  Copyright 2010  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

+ *

+ *  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 = 1,

+

+				.DataINEndpointNumber      = MIDI_STREAM_IN_EPNUM,

+				.DataINEndpointSize        = MIDI_STREAM_EPSIZE,

+				.DataINEndpointDoubleBank  = false,

+

+				.DataOUTEndpointNumber     = MIDI_STREAM_OUT_EPNUM,

+				.DataOUTEndpointSize       = MIDI_STREAM_EPSIZE,

+				.DataOUTEndpointDoubleBank = false,

+			},

+	};

+

+const uint8_t SineTable[] PROGMEM =

+{

+	0x80, 0x83, 0x86, 0x89, 0x8c, 0x8f, 0x92, 0x95, 0x98, 0x9c, 0x9f, 0xa2, 0xa5, 0xa8, 0xab, 0xae, 

+	0xb0, 0xb3, 0xb6, 0xb9, 0xbc, 0xbf, 0xc1, 0xc4, 0xc7, 0xc9, 0xcc, 0xce, 0xd1, 0xd3, 0xd5, 0xd8, 

+	0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xed, 0xef, 0xf0, 0xf2, 0xf3, 0xf5, 

+	0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 

+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xfe, 0xfd, 0xfc, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7, 

+	0xf6, 0xf5, 0xf3, 0xf2, 0xf0, 0xef, 0xed, 0xec, 0xea, 0xe8, 0xe6, 0xe4, 0xe2, 0xe0, 0xde, 0xdc, 

+	0xda, 0xd8, 0xd5, 0xd3, 0xd1, 0xce, 0xcc, 0xc9, 0xc7, 0xc4, 0xc1, 0xbf, 0xbc, 0xb9, 0xb6, 0xb3, 

+	0xb0, 0xae, 0xab, 0xa8, 0xa5, 0xa2, 0x9f, 0x9c, 0x98, 0x95, 0x92, 0x8f, 0x8c, 0x89, 0x86, 0x83, 

+	0x80, 0x7c, 0x79, 0x76, 0x73, 0x70, 0x6d, 0x6a, 0x67, 0x63, 0x60, 0x5d, 0x5a, 0x57, 0x54, 0x51, 

+	0x4f, 0x4c, 0x49, 0x46, 0x43, 0x40, 0x3e, 0x3b, 0x38, 0x36, 0x33, 0x31, 0x2e, 0x2c, 0x2a, 0x27, 

+	0x25, 0x23, 0x21, 0x1f, 0x1d, 0x1b, 0x19, 0x17, 0x15, 0x13, 0x12, 0x10, 0x0f, 0x0d, 0x0c, 0x0a, 

+	0x09, 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x03, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 

+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 

+	0x09, 0x0a, 0x0c, 0x0d, 0x0f, 0x10, 0x12, 0x13, 0x15, 0x17, 0x19, 0x1b, 0x1d, 0x1f, 0x21, 0x23, 

+	0x25, 0x27, 0x2a, 0x2c, 0x2e, 0x31, 0x33, 0x36, 0x38, 0x3b, 0x3e, 0x40, 0x43, 0x46, 0x49, 0x4c, 

+	0x4f, 0x51, 0x54, 0x57, 0x5a, 0x5d, 0x60, 0x63, 0x67, 0x6a, 0x6d, 0x70, 0x73, 0x76, 0x79, 0x7c

+};

+

+struct

+{

+	uint8_t Pitch;

+	uint8_t Velocity;

+	

+	uint8_t CurrentPos;

+	uint8_t ElapsedTicks;

+} ChannelStates[10];

+

+/** 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);

+	

+	for (;;)

+	{

+		MIDI_EventPacket_t ReceivedMIDIEvent;

+		if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent))

+		{

+			if (ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4))

+			{

+				ChannelStates[ReceivedMIDIEvent.Data1 & 0x0F].Pitch    = ReceivedMIDIEvent.Data2;

+				ChannelStates[ReceivedMIDIEvent.Data1 & 0x0F].Velocity = ReceivedMIDIEvent.Data3;

+

+				LEDs_SetAllLEDs(LEDS_LED1);

+			}

+			else if (ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_OFF >> 4))

+			{

+				ChannelStates[ReceivedMIDIEvent.Data1 & 0x0F].Velocity = 0;

+				

+				LEDs_SetAllLEDs(LEDS_NO_LEDS);

+			}

+		}

+

+		/* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */

+		if (TIFR0 & (1 << OCF0A))

+		{

+			/* Clear the sample reload timer */

+			TIFR0 |= (1 << OCF0A);

+

+			uint8_t OutputSample = 0;

+			

+			/* Loop through the channels (excluding percussion channel 10) and generate next sample */

+			for (uint8_t Channel = 0; Channel < 9; Channel++)

+			{

+				/* Channel only contributes if it is not muted */

+				if (ChannelStates[Channel].Velocity)

+				{

+					/* Fetch the current sample from the sine lookup table */

+					uint8_t TableValue = pgm_read_byte(&SineTable[ChannelStates[Channel].CurrentPos]);

+				

+					/* Scale sample value by the velocity of the channel */

+					TableValue = ((uint16_t)TableValue << 6) / ChannelStates[Channel].Velocity;

+					

+					/* Add the sample to the output waveform */

+					OutputSample += TableValue;

+				}

+				

+				/* Calculate next sample table position for this channel */

+				ChannelStates[Channel].CurrentPos += ChannelStates[Channel].Pitch;

+			}

+			

+			/* Output the sample to the PWM timer */

+			OCR3A = OutputSample;

+		}

+	

+		MIDI_Device_USBTask(&Keyboard_MIDI_Interface);

+		USB_USBTask();

+	}

+}

+

+/** Configures the board hardware and chip peripherals for the demo's functionality. */

+void SetupHardware(void)

+{

+	/* Disable watchdog if enabled by bootloader/fuses */

+	MCUSR &= ~(1 << WDRF);

+	wdt_disable();

+

+	/* Disable clock division */

+	clock_prescale_set(clock_div_1);

+	

+	/* Hardware Initialization */

+	LEDs_Init();

+	USB_Init();

+

+	/* Sample reload timer initialization */

+	OCR0A   = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;

+	TCCR0A  = (1 << WGM01);  // CTC mode

+	TCCR0B  = (1 << CS01);   // Fcpu/8 speed

+

+	/* PWM speaker timer initialization */

+	TCCR3A  = ((1 << WGM30) | (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);

+

+	/* 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)

+{

+	LEDs_SetAllLEDs(LEDMASK_USB_READY);

+	

+	if (!(MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface)))

+	  LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

+}

+

+/** Event handler for the library USB Unhandled Control Request event. */

+void EVENT_USB_Device_UnhandledControlRequest(void)

+{

+	MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);

+}