Projects/Incomplete/MIDIToneGenerator/MIDIToneGenerator.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  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 disclaim 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  */
  43 USB_ClassInfo_MIDI_Device_t Keyboard_MIDI_Interface =
  44         {
  45                 .Config =
  46                         {
  47                                 .StreamingInterfaceNumber = 1,
  48
  49                                 .DataINEndpointNumber      = MIDI_STREAM_IN_EPNUM,
  50                                 .DataINEndpointSize        = MIDI_STREAM_EPSIZE,
  51                                 .DataINEndpointDoubleBank  = false,
  52
  53                                 .DataOUTEndpointNumber     = MIDI_STREAM_OUT_EPNUM,
  54                                 .DataOUTEndpointSize       = MIDI_STREAM_EPSIZE,
  55                                 .DataOUTEndpointDoubleBank = false,
  56                         },
  57         };
  58
  59 const uint8_t SineTable[] PROGMEM =
  60 {
  61         0x80, 0x83, 0x86, 0x89, 0x8c, 0x8f, 0x92, 0x95, 0x98, 0x9c, 0x9f, 0xa2, 0xa5, 0xa8, 0xab, 0xae,
  62         0xb0, 0xb3, 0xb6, 0xb9, 0xbc, 0xbf, 0xc1, 0xc4, 0xc7, 0xc9, 0xcc, 0xce, 0xd1, 0xd3, 0xd5, 0xd8,
  63         0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xed, 0xef, 0xf0, 0xf2, 0xf3, 0xf5,
  64         0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc, 0xfd, 0xfe, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff,
  65         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xfe, 0xfd, 0xfc, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7,
  66         0xf6, 0xf5, 0xf3, 0xf2, 0xf0, 0xef, 0xed, 0xec, 0xea, 0xe8, 0xe6, 0xe4, 0xe2, 0xe0, 0xde, 0xdc,
  67         0xda, 0xd8, 0xd5, 0xd3, 0xd1, 0xce, 0xcc, 0xc9, 0xc7, 0xc4, 0xc1, 0xbf, 0xbc, 0xb9, 0xb6, 0xb3,
  68         0xb0, 0xae, 0xab, 0xa8, 0xa5, 0xa2, 0x9f, 0x9c, 0x98, 0x95, 0x92, 0x8f, 0x8c, 0x89, 0x86, 0x83,
  69         0x80, 0x7c, 0x79, 0x76, 0x73, 0x70, 0x6d, 0x6a, 0x67, 0x63, 0x60, 0x5d, 0x5a, 0x57, 0x54, 0x51,
  70         0x4f, 0x4c, 0x49, 0x46, 0x43, 0x40, 0x3e, 0x3b, 0x38, 0x36, 0x33, 0x31, 0x2e, 0x2c, 0x2a, 0x27,
  71         0x25, 0x23, 0x21, 0x1f, 0x1d, 0x1b, 0x19, 0x17, 0x15, 0x13, 0x12, 0x10, 0x0f, 0x0d, 0x0c, 0x0a,
  72         0x09, 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x03, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
  73         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
  74         0x09, 0x0a, 0x0c, 0x0d, 0x0f, 0x10, 0x12, 0x13, 0x15, 0x17, 0x19, 0x1b, 0x1d, 0x1f, 0x21, 0x23,
  75         0x25, 0x27, 0x2a, 0x2c, 0x2e, 0x31, 0x33, 0x36, 0x38, 0x3b, 0x3e, 0x40, 0x43, 0x46, 0x49, 0x4c,
  76         0x4f, 0x51, 0x54, 0x57, 0x5a, 0x5d, 0x60, 0x63, 0x67, 0x6a, 0x6d, 0x70, 0x73, 0x76, 0x79, 0x7c
  77 };
  78
  79 uint8_t Pitch;
  80 uint8_t Velocity;
  81 uint8_t CurrentPos;
  82
  83 /** Main program entry point. This routine contains the overall program flow, including initial
  84  *  setup of all components and the main program loop.
  85  */
  86 int main(void)
  87 {
  88         SetupHardware();
  89
  90         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  91
  92         for (;;)
  93         {
  94                 MIDI_EventPacket_t ReceivedMIDIEvent;
  95                 if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent))
  96                 {
  97                         if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
  98                         {
  99                                 Pitch    = ReceivedMIDIEvent.Data2;
 100                                 Velocity = ReceivedMIDIEvent.Data3;
 101
 102                                 LEDs_SetAllLEDs(LEDS_LED1);
 103                         }
 104                         else if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_OFF >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
 105                         {
 106                                 Velocity = 0;
 107
 108                                 LEDs_SetAllLEDs(LEDS_NO_LEDS);
 109                         }
 110                 }
 111
 112                 /* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */
 113                 if (TIFR0 & (1 << OCF0A))
 114                 {
 115                         /* Clear the sample reload timer */
 116                         TIFR0 |= (1 << OCF0A);
 117
 118                         /* Fetch the current sample from the sine lookup table */
 119                         OCR3A = Velocity ? pgm_read_byte(&SineTable[CurrentPos]) : 0;
 120
 121                         /* Calculate next sample table position for this channel */
 122                         CurrentPos += (Pitch >> 1);
 123                 }
 124
 125                 MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
 126                 USB_USBTask();
 127         }
 128 }
 129
 130 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 131 void SetupHardware(void)
 132 {
 133         /* Disable watchdog if enabled by bootloader/fuses */
 134         MCUSR &= ~(1 << WDRF);
 135         wdt_disable();
 136
 137         /* Disable clock division */
 138         clock_prescale_set(clock_div_1);
 139
 140         /* Hardware Initialization */
 141         LEDs_Init();
 142         USB_Init();
 143
 144         /* Sample reload timer initialization */
 145         OCR0A   = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
 146         TCCR0A  = (1 << WGM01);  // CTC mode
 147         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 148
 149         /* PWM speaker timer initialization */
 150         TCCR3A  = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
 151         TCCR3B  = ((1 << WGM32) | (1 << CS30));  // Fast 8-Bit PWM, Fcpu speed
 152 }
 153
 154 /** Event handler for the library USB Connection event. */
 155 void EVENT_USB_Device_Connect(void)
 156 {
 157         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 158
 159         /* Set speaker as output */
 160         DDRC |= (1 << 6);
 161 }
 162
 163 /** Event handler for the library USB Disconnection event. */
 164 void EVENT_USB_Device_Disconnect(void)
 165 {
 166         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 167
 168         /* Set speaker as input to reduce current draw */
 169         DDRC &= ~(1 << 6);
 170 }
 171
 172 /** Event handler for the library USB Configuration Changed event. */
 173 void EVENT_USB_Device_ConfigurationChanged(void)
 174 {
 175         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 176
 177         if (!(MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface)))
 178           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 179 }
 180
 181 /** Event handler for the library USB Unhandled Control Request event. */
 182 void EVENT_USB_Device_UnhandledControlRequest(void)
 183 {
 184         MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);
 185 }