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diff --git a/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c b/lib/lufa/Projects/MIDIToneGenerator/MIDIToneGenerator.c
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1/*
2 LUFA Library
3 Copyright (C) Dean Camera, 2017.
4
5 dean [at] fourwalledcubicle [dot] com
6 www.lufa-lib.org
7*/
8
9/*
10 Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
11
12 Permission to use, copy, modify, distribute, and sell this
13 software and its documentation for any purpose is hereby granted
14 without fee, provided that the above copyright notice appear in
15 all copies and that both that the copyright notice and this
16 permission notice and warranty disclaimer appear in supporting
17 documentation, and that the name of the author not be used in
18 advertising or publicity pertaining to distribution of the
19 software without specific, written prior permission.
20
21 The author disclaims all warranties with regard to this
22 software, including all implied warranties of merchantability
23 and fitness. In no event shall the author be liable for any
24 special, indirect or consequential damages or any damages
25 whatsoever resulting from loss of use, data or profits, whether
26 in an action of contract, negligence or other tortious action,
27 arising out of or in connection with the use or performance of
28 this software.
29*/
30
31/** \file
32 *
33 * Main source file for the MIDI demo. This file contains the main tasks of
34 * the demo and is responsible for the initial application hardware configuration.
35 */
36
37#include "MIDIToneGenerator.h"
38
39/** LUFA MIDI Class driver interface configuration and state information. This structure is
40 * passed to all MIDI Class driver functions, so that multiple instances of the same class
41 * within a device can be differentiated from one another.
42 */
43USB_ClassInfo_MIDI_Device_t Keyboard_MIDI_Interface =
44 {
45 .Config =
46 {
47 .StreamingInterfaceNumber = INTERFACE_ID_AudioStream,
48 .DataINEndpoint =
49 {
50 .Address = MIDI_STREAM_IN_EPADDR,
51 .Size = MIDI_STREAM_EPSIZE,
52 .Banks = 1,
53 },
54 .DataOUTEndpoint =
55 {
56 .Address = MIDI_STREAM_OUT_EPADDR,
57 .Size = MIDI_STREAM_EPSIZE,
58 .Banks = 1,
59 },
60 },
61 };
62
63/** 8-bit 256 entry Sine Wave lookup table */
64static const uint8_t SineTable[256] =
65{
66 128, 131, 134, 137, 140, 143, 146, 149, 152, 156, 159, 162, 165, 168, 171, 174,
67 176, 179, 182, 185, 188, 191, 193, 196, 199, 201, 204, 206, 209, 211, 213, 216,
68 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 237, 239, 240, 242, 243, 245,
69 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 254, 255, 255, 255, 255, 255,
70 255, 255, 255, 255, 255, 255, 254, 254, 253, 252, 252, 251, 250, 249, 248, 247,
71 246, 245, 243, 242, 240, 239, 237, 236, 234, 232, 230, 228, 226, 224, 222, 220,
72 218, 216, 213, 211, 209, 206, 204, 201, 199, 196, 193, 191, 188, 185, 182, 179,
73 176, 174, 171, 168, 165, 162, 159, 156, 152, 149, 146, 143, 140, 137, 134, 131,
74 128, 124, 121, 118, 115, 112, 109, 106, 103, 99, 96, 93, 90, 87, 84, 81,
75 79, 76, 73, 70, 67, 64, 62, 59, 56, 54, 51, 49, 46, 44, 42, 39,
76 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 18, 16, 15, 13, 12, 10,
77 9, 8, 7, 6, 5, 4, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0,
78 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8,
79 9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35,
80 37, 39, 42, 44, 46, 49, 51, 54, 56, 59, 62, 64, 67, 70, 73, 76,
81 79, 81, 84, 87, 90, 93, 96, 99, 103, 106, 109, 112, 115, 118, 121, 124,
82};
83
84/** Array of structures describing each note being generated */
85static DDSNoteData NoteData[MAX_SIMULTANEOUS_NOTES];
86
87
88/** Main program entry point. This routine contains the overall program flow, including initial
89 * setup of all components and the main program loop.
90 */
91int main(void)
92{
93 SetupHardware();
94
95 LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
96 GlobalInterruptEnable();
97
98 for (;;)
99 {
100 MIDI_EventPacket_t ReceivedMIDIEvent;
101 if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent))
102 {
103 if ((ReceivedMIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
104 {
105 DDSNoteData* LRUNoteStruct = &NoteData[0];
106
107 /* Find a free entry in the note table to use for the note being turned on */
108 for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
109 {
110 /* Check if the note is unused */
111 if (!(NoteData[i].Pitch))
112 {
113 /* If a note is unused, it's age is essentially infinite - always prefer unused note entries */
114 LRUNoteStruct = &NoteData[i];
115 break;
116 }
117 else if (NoteData[i].LRUAge >= LRUNoteStruct->LRUAge)
118 {
119 /* If an older entry that the current entry has been found, prefer overwriting that one */
120 LRUNoteStruct = &NoteData[i];
121 }
122
123 NoteData[i].LRUAge++;
124 }
125
126 /* Update the oldest note entry with the new note data and reset its age */
127 LRUNoteStruct->Pitch = ReceivedMIDIEvent.Data2;
128 LRUNoteStruct->TableIncrement = (uint32_t)(BASE_INCREMENT * SCALE_FACTOR) +
129 ((uint32_t)(BASE_INCREMENT * NOTE_OCTIVE_RATIO * SCALE_FACTOR) *
130 (ReceivedMIDIEvent.Data2 - BASE_PITCH_INDEX));
131 LRUNoteStruct->TablePosition = 0;
132 LRUNoteStruct->LRUAge = 0;
133
134 /* Turn on indicator LED to indicate note generation activity */
135 LEDs_SetAllLEDs(LEDS_LED1);
136 }
137 else if ((ReceivedMIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_OFF)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
138 {
139 bool FoundActiveNote = false;
140
141 /* Find the note in the note table to turn off */
142 for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
143 {
144 if (NoteData[i].Pitch == ReceivedMIDIEvent.Data2)
145 NoteData[i].Pitch = 0;
146 else if (NoteData[i].Pitch)
147 FoundActiveNote = true;
148 }
149
150 /* If all notes off, turn off the indicator LED */
151 if (!(FoundActiveNote))
152 LEDs_SetAllLEDs(LEDS_NO_LEDS);
153 }
154 }
155
156 MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
157 USB_USBTask();
158 }
159}
160
161/** ISR to handle the reloading of the PWM timer with the next sample. */
162ISR(TIMER0_COMPA_vect, ISR_BLOCK)
163{
164 uint16_t MixedSample = 0;
165
166 /* Sum together all the active notes to form a single sample */
167 for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
168 {
169 /* A non-zero pitch indicates the note is active */
170 if (NoteData[i].Pitch)
171 {
172 /* Use the top 8 bits of the table position as the sample table index */
173 uint8_t TableIndex = (NoteData[i].TablePosition >> 24);
174
175 /* Add the new tone sample to the accumulator and increment the table position */
176 MixedSample += SineTable[TableIndex];
177 NoteData[i].TablePosition += NoteData[i].TableIncrement;
178 }
179 }
180
181 /* Output clamped mixed sample value to the PWM */
182 OCR3A = (MixedSample <= 0xFF) ? MixedSample : 0xFF;
183}
184
185/** Configures the board hardware and chip peripherals for the demo's functionality. */
186void SetupHardware(void)
187{
188#if (ARCH == ARCH_AVR8)
189 /* Disable watchdog if enabled by bootloader/fuses */
190 MCUSR &= ~(1 << WDRF);
191 wdt_disable();
192
193 /* Disable clock division */
194 clock_prescale_set(clock_div_1);
195#endif
196
197 /* Hardware Initialization */
198 LEDs_Init();
199 USB_Init();
200
201 /* Sample reload timer initialization */
202 TIMSK0 = (1 << OCIE0A);
203 OCR0A = (VIRTUAL_SAMPLE_TABLE_SIZE / 8);
204 TCCR0A = (1 << WGM01); // CTC mode
205 TCCR0B = (1 << CS01); // Fcpu/8 speed
206
207 /* Set speaker as output */
208 DDRC |= (1 << 6);
209
210 /* PWM speaker timer initialization */
211 TCCR3A = ((1 << WGM31) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
212 TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, Fcpu speed
213}
214
215/** Event handler for the library USB Connection event. */
216void EVENT_USB_Device_Connect(void)
217{
218 LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
219
220 /* Set speaker as output */
221 DDRC |= (1 << 6);
222}
223
224/** Event handler for the library USB Disconnection event. */
225void EVENT_USB_Device_Disconnect(void)
226{
227 LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
228
229 /* Disable any notes currently being played */
230 for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)
231 NoteData[i].Pitch = 0;
232
233 /* Set speaker as input to reduce current draw */
234 DDRC &= ~(1 << 6);
235}
236
237/** Event handler for the library USB Configuration Changed event. */
238void EVENT_USB_Device_ConfigurationChanged(void)
239{
240 bool ConfigSuccess = true;
241
242 ConfigSuccess &= MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface);
243
244 LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
245}
246
247/** Event handler for the library USB Control Request event. */
248void EVENT_USB_Device_ControlRequest(void)
249{
250 MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);
251}
252
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