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         sei();
  92
  93         for (;;)
  94         {
  95                 MIDI_EventPacket_t ReceivedMIDIEvent;
  96                 if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent))
  97                 {
  98                         if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
  99                         {
 100                                 Pitch    = ReceivedMIDIEvent.Data2;
 101                                 Velocity = ReceivedMIDIEvent.Data3;
 102
 103                                 LEDs_SetAllLEDs(LEDS_LED1);
 104                         }
 105                         else if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_OFF >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))
 106                         {
 107                                 Velocity = 0;
 108
 109                                 LEDs_SetAllLEDs(LEDS_NO_LEDS);
 110                         }
 111                 }
 112
 113                 /* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */
 114                 if (TIFR0 & (1 << OCF0A))
 115                 {
 116                         /* Clear the sample reload timer */
 117                         TIFR0 |= (1 << OCF0A);
 118
 119                         /* Fetch the current sample from the sine lookup table */
 120                         OCR3A = Velocity ? pgm_read_byte(&SineTable[CurrentPos]) : 0;
 121
 122                         /* Calculate next sample table position for this channel */
 123                         CurrentPos += (Pitch >> 1);
 124                 }
 125
 126                 MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
 127                 USB_USBTask();
 128         }
 129 }
 130
 131 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 132 void SetupHardware(void)
 133 {
 134         /* Disable watchdog if enabled by bootloader/fuses */
 135         MCUSR &= ~(1 << WDRF);
 136         wdt_disable();
 137
 138         /* Disable clock division */
 139         clock_prescale_set(clock_div_1);
 140
 141         /* Hardware Initialization */
 142         LEDs_Init();
 143         USB_Init();
 144
 145         /* Sample reload timer initialization */
 146         OCR0A   = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
 147         TCCR0A  = (1 << WGM01);  // CTC mode
 148         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 149
 150         /* PWM speaker timer initialization */
 151         TCCR3A  = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
 152         TCCR3B  = ((1 << WGM32) | (1 << CS30));  // Fast 8-Bit PWM, Fcpu speed
 153 }
 154
 155 /** Event handler for the library USB Connection event. */
 156 void EVENT_USB_Device_Connect(void)
 157 {
 158         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 159
 160         /* Set speaker as output */
 161         DDRC |= (1 << 6);
 162 }
 163
 164 /** Event handler for the library USB Disconnection event. */
 165 void EVENT_USB_Device_Disconnect(void)
 166 {
 167         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 168
 169         /* Set speaker as input to reduce current draw */
 170         DDRC &= ~(1 << 6);
 171 }
 172
 173 /** Event handler for the library USB Configuration Changed event. */
 174 void EVENT_USB_Device_ConfigurationChanged(void)
 175 {
 176         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 177
 178         if (!(MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface)))
 179           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 180 }
 181
 182 /** Event handler for the library USB Unhandled Control Request event. */
 183 void EVENT_USB_Device_UnhandledControlRequest(void)
 184 {
 185         MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);
 186 }