-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2010.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, distribute, and sell this \r
- software and its documentation for any purpose is hereby granted\r
- without fee, provided that the above copyright notice appear in \r
- all copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting \r
- documentation, and that the name of the author not be used in \r
- advertising or publicity pertaining to distribution of the \r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- *\r
- * Main source file for the MIDI demo. This file contains the main tasks of\r
- * the demo and is responsible for the initial application hardware configuration.\r
- */\r
-\r
-#include "MIDIToneGenerator.h"\r
-\r
-/** LUFA MIDI Class driver interface configuration and state information. This structure is\r
- * passed to all MIDI Class driver functions, so that multiple instances of the same class\r
- * within a device can be differentiated from one another.\r
- */\r
-USB_ClassInfo_MIDI_Device_t Keyboard_MIDI_Interface =\r
- {\r
- .Config =\r
- {\r
- .StreamingInterfaceNumber = 1,\r
-\r
- .DataINEndpointNumber = MIDI_STREAM_IN_EPNUM,\r
- .DataINEndpointSize = MIDI_STREAM_EPSIZE,\r
- .DataINEndpointDoubleBank = false,\r
-\r
- .DataOUTEndpointNumber = MIDI_STREAM_OUT_EPNUM,\r
- .DataOUTEndpointSize = MIDI_STREAM_EPSIZE,\r
- .DataOUTEndpointDoubleBank = false,\r
- },\r
- };\r
-\r
-/** 8-bit 256 entry Sine Wave lookup table */\r
-const uint8_t SineTable[256] =\r
-{\r
- 128, 131, 134, 137, 140, 143, 146, 149, 152, 156, 159, 162, 165, 168, 171, 174,\r
- 176, 179, 182, 185, 188, 191, 193, 196, 199, 201, 204, 206, 209, 211, 213, 216,\r
- 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 237, 239, 240, 242, 243, 245,\r
- 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 254, 255, 255, 255, 255, 255,\r
- 255, 255, 255, 255, 255, 255, 254, 254, 253, 252, 252, 251, 250, 249, 248, 247,\r
- 246, 245, 243, 242, 240, 239, 237, 236, 234, 232, 230, 228, 226, 224, 222, 220,\r
- 218, 216, 213, 211, 209, 206, 204, 201, 199, 196, 193, 191, 188, 185, 182, 179,\r
- 176, 174, 171, 168, 165, 162, 159, 156, 152, 149, 146, 143, 140, 137, 134, 131,\r
- 128, 124, 121, 118, 115, 112, 109, 106, 103, 99, 96, 93, 90, 87, 84, 81,\r
- 79, 76, 73, 70, 67, 64, 62, 59, 56, 54, 51, 49, 46, 44, 42, 39,\r
- 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 18, 16, 15, 13, 12, 10,\r
- 9, 8, 7, 6, 5, 4, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0,\r
- 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8,\r
- 9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35,\r
- 37, 39, 42, 44, 46, 49, 51, 54, 56, 59, 62, 64, 67, 70, 73, 76,\r
- 79, 81, 84, 87, 90, 93, 96, 99, 103, 106, 109, 112, 115, 118, 121, 124,\r
-};\r
-\r
-/** Array of structures describing each note being generated */\r
-DDSNoteData NoteData[MAX_SIMULTANEOUS_NOTES];\r
-\r
-/** Main program entry point. This routine contains the overall program flow, including initial\r
- * setup of all components and the main program loop.\r
- */\r
-int main(void)\r
-{\r
- SetupHardware();\r
-\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
- sei();\r
- \r
- for (;;)\r
- {\r
- MIDI_EventPacket_t ReceivedMIDIEvent;\r
- if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent))\r
- {\r
- if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_ON >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))\r
- {\r
- DDSNoteData* LRUNoteStruct = &NoteData[0];\r
- \r
- /* Find a free entry in the note table to use for the note being turned on */\r
- for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)\r
- {\r
- /* Check if the note is unused */\r
- if (!(NoteData[i].Pitch))\r
- {\r
- /* If a note is unused, it's age is essentially infinite - always prefer unused not entries */\r
- LRUNoteStruct = &NoteData[i];\r
- break;\r
- }\r
- else if (NoteData[i].LRUAge > LRUNoteStruct->LRUAge)\r
- {\r
- /* If an older entry that the current entry has been found, prefer overwriting that one */ \r
- LRUNoteStruct = &NoteData[i];\r
- }\r
- \r
- NoteData[i].LRUAge++;\r
- }\r
- \r
- /* Update the oldest note entry with the new note data and reset its age */\r
- LRUNoteStruct->Pitch = ReceivedMIDIEvent.Data2;\r
- LRUNoteStruct->TableIncrement = (uint32_t)(BASE_INCREMENT * SCALE_FACTOR) +\r
- ((uint32_t)(BASE_INCREMENT * NOTE_OCTIVE_RATIO * SCALE_FACTOR) *\r
- (ReceivedMIDIEvent.Data2 - BASE_PITCH_INDEX));\r
- LRUNoteStruct->TablePosition = 0;\r
- LRUNoteStruct->LRUAge = 0;\r
-\r
- /* Turn on indicator LED to indicate note generation activity */\r
- LEDs_SetAllLEDs(LEDS_LED1);\r
- }\r
- else if ((ReceivedMIDIEvent.Command == (MIDI_COMMAND_NOTE_OFF >> 4)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0))\r
- {\r
- bool FoundActiveNote = false;\r
- \r
- /* Find the note in the note table to turn off */\r
- for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)\r
- {\r
- if (NoteData[i].Pitch == ReceivedMIDIEvent.Data2)\r
- NoteData[i].Pitch = 0;\r
- else if (NoteData[i].Pitch)\r
- FoundActiveNote = true;\r
- }\r
- \r
- /* If all notes off, turn off the indicator LED */\r
- if (!(FoundActiveNote))\r
- LEDs_SetAllLEDs(LEDS_NO_LEDS);\r
- }\r
- }\r
- \r
- MIDI_Device_USBTask(&Keyboard_MIDI_Interface);\r
- USB_USBTask();\r
- }\r
-}\r
-\r
-/** ISR to handle the reloading of the PWM timer with the next sample. */\r
-ISR(TIMER0_COMPA_vect, ISR_BLOCK)\r
-{\r
- uint16_t MixedSample = 0;\r
- \r
- /* Sum together all the active notes to form a single sample */\r
- for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)\r
- {\r
- if (NoteData[i].Pitch)\r
- {\r
- MixedSample += SineTable[NoteData[i].TablePosition >> 24];\r
- NoteData[i].TablePosition += NoteData[i].TableIncrement;\r
- }\r
- }\r
- \r
- /* Output clamped mixed sample value to the PWM */\r
- OCR3A = (MixedSample <= 0xFF) ? MixedSample : 0xFF;\r
-}\r
-\r
-/** Configures the board hardware and chip peripherals for the demo's functionality. */\r
-void SetupHardware(void)\r
-{\r
- /* Disable watchdog if enabled by bootloader/fuses */\r
- MCUSR &= ~(1 << WDRF);\r
- wdt_disable();\r
-\r
- /* Disable clock division */\r
- clock_prescale_set(clock_div_1);\r
- \r
- /* Hardware Initialization */\r
- LEDs_Init();\r
- USB_Init();\r
-\r
- /* Sample reload timer initialization */\r
- TIMSK0 = (1 << OCIE0A);\r
- OCR0A = (VIRTUAL_SAMPLE_TABLE_SIZE / 8);\r
- TCCR0A = (1 << WGM01); // CTC mode\r
- TCCR0B = (1 << CS01); // Fcpu/8 speed\r
-\r
- /* Set speaker as output */\r
- DDRC |= (1 << 6);\r
-\r
- /* PWM speaker timer initialization */\r
- TCCR3A = ((1 << WGM31) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP\r
- TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, Fcpu speed\r
-}\r
-\r
-/** Event handler for the library USB Connection event. */\r
-void EVENT_USB_Device_Connect(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
-\r
- /* Set speaker as output */\r
- DDRC |= (1 << 6);\r
-}\r
-\r
-/** Event handler for the library USB Disconnection event. */\r
-void EVENT_USB_Device_Disconnect(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
-\r
- /* Disable any notes currently being played */\r
- for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++)\r
- NoteData[i].Pitch = 0;\r
-\r
- /* Set speaker as input to reduce current draw */\r
- DDRC &= ~(1 << 6);\r
-}\r
-\r
-/** Event handler for the library USB Configuration Changed event. */\r
-void EVENT_USB_Device_ConfigurationChanged(void)\r
-{\r
- bool ConfigSuccess = true;\r
-\r
- ConfigSuccess &= MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface);\r
- \r
- LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);\r
-}\r
-\r
-/** Event handler for the library USB Control Request event. */\r
-void EVENT_USB_Device_ControlRequest(void)\r
-{\r
- MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);\r
-}\r
projects / pub / lufa.git / blobdiff