/* LUFA Library Copyright (C) Dean Camera, 2018. dean [at] fourwalledcubicle [dot] com www.lufa-lib.org */ /* Copyright 2018 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 disclaims 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 = INTERFACE_ID_AudioStream, .DataINEndpoint = { .Address = MIDI_STREAM_IN_EPADDR, .Size = MIDI_STREAM_EPSIZE, .Banks = 1, }, .DataOUTEndpoint = { .Address = MIDI_STREAM_OUT_EPADDR, .Size = MIDI_STREAM_EPSIZE, .Banks = 1, }, }, }; /** 8-bit 256 entry Sine Wave lookup table */ static const uint8_t SineTable[256] = { 128, 131, 134, 137, 140, 143, 146, 149, 152, 156, 159, 162, 165, 168, 171, 174, 176, 179, 182, 185, 188, 191, 193, 196, 199, 201, 204, 206, 209, 211, 213, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 237, 239, 240, 242, 243, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254, 254, 253, 252, 252, 251, 250, 249, 248, 247, 246, 245, 243, 242, 240, 239, 237, 236, 234, 232, 230, 228, 226, 224, 222, 220, 218, 216, 213, 211, 209, 206, 204, 201, 199, 196, 193, 191, 188, 185, 182, 179, 176, 174, 171, 168, 165, 162, 159, 156, 152, 149, 146, 143, 140, 137, 134, 131, 128, 124, 121, 118, 115, 112, 109, 106, 103, 99, 96, 93, 90, 87, 84, 81, 79, 76, 73, 70, 67, 64, 62, 59, 56, 54, 51, 49, 46, 44, 42, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 18, 16, 15, 13, 12, 10, 9, 8, 7, 6, 5, 4, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16, 18, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 42, 44, 46, 49, 51, 54, 56, 59, 62, 64, 67, 70, 73, 76, 79, 81, 84, 87, 90, 93, 96, 99, 103, 106, 109, 112, 115, 118, 121, 124, }; /** Array of structures describing each note being generated */ static DDSNoteData NoteData[MAX_SIMULTANEOUS_NOTES]; /** 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); GlobalInterruptEnable(); for (;;) { MIDI_EventPacket_t ReceivedMIDIEvent; if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent)) { if ((ReceivedMIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0)) { DDSNoteData* LRUNoteStruct = &NoteData[0]; /* Find a free entry in the note table to use for the note being turned on */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) { /* Check if the note is unused */ if (!(NoteData[i].Pitch)) { /* If a note is unused, it's age is essentially infinite - always prefer unused note entries */ LRUNoteStruct = &NoteData[i]; break; } else if (NoteData[i].LRUAge >= LRUNoteStruct->LRUAge) { /* If an older entry that the current entry has been found, prefer overwriting that one */ LRUNoteStruct = &NoteData[i]; } NoteData[i].LRUAge++; } /* Update the oldest note entry with the new note data and reset its age */ LRUNoteStruct->Pitch = ReceivedMIDIEvent.Data2; LRUNoteStruct->TableIncrement = (uint32_t)(BASE_INCREMENT * SCALE_FACTOR) + ((uint32_t)(BASE_INCREMENT * NOTE_OCTIVE_RATIO * SCALE_FACTOR) * (ReceivedMIDIEvent.Data2 - BASE_PITCH_INDEX)); LRUNoteStruct->TablePosition = 0; LRUNoteStruct->LRUAge = 0; /* Turn on indicator LED to indicate note generation activity */ LEDs_SetAllLEDs(LEDS_LED1); } else if ((ReceivedMIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_OFF)) && ((ReceivedMIDIEvent.Data1 & 0x0F) == 0)) { bool FoundActiveNote = false; /* Find the note in the note table to turn off */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) { if (NoteData[i].Pitch == ReceivedMIDIEvent.Data2) NoteData[i].Pitch = 0; else if (NoteData[i].Pitch) FoundActiveNote = true; } /* If all notes off, turn off the indicator LED */ if (!(FoundActiveNote)) LEDs_SetAllLEDs(LEDS_NO_LEDS); } } MIDI_Device_USBTask(&Keyboard_MIDI_Interface); USB_USBTask(); } } /** ISR to handle the reloading of the PWM timer with the next sample. */ ISR(TIMER0_COMPA_vect, ISR_BLOCK) { uint16_t MixedSample = 0; /* Sum together all the active notes to form a single sample */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) { /* A non-zero pitch indicates the note is active */ if (NoteData[i].Pitch) { /* Use the top 8 bits of the table position as the sample table index */ uint8_t TableIndex = (NoteData[i].TablePosition >> 24); /* Add the new tone sample to the accumulator and increment the table position */ MixedSample += SineTable[TableIndex]; NoteData[i].TablePosition += NoteData[i].TableIncrement; } } /* Output clamped mixed sample value to the PWM */ OCR3A = (MixedSample <= 0xFF) ? MixedSample : 0xFF; } /** Configures the board hardware and chip peripherals for the demo's functionality. */ void SetupHardware(void) { #if (ARCH == ARCH_AVR8) /* Disable watchdog if enabled by bootloader/fuses */ MCUSR &= ~(1 << WDRF); wdt_disable(); /* Disable clock division */ clock_prescale_set(clock_div_1); #endif /* Hardware Initialization */ LEDs_Init(); USB_Init(); /* Sample reload timer initialization */ TIMSK0 = (1 << OCIE0A); OCR0A = (VIRTUAL_SAMPLE_TABLE_SIZE / 8); TCCR0A = (1 << WGM01); // CTC mode TCCR0B = (1 << CS01); // Fcpu/8 speed /* Set speaker as output */ DDRC |= (1 << 6); /* PWM speaker timer initialization */ TCCR3A = ((1 << WGM31) | (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); /* Disable any notes currently being played */ for (uint8_t i = 0; i < MAX_SIMULTANEOUS_NOTES; i++) NoteData[i].Pitch = 0; /* 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) { bool ConfigSuccess = true; ConfigSuccess &= MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface); LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR); } /** Event handler for the library USB Control Request event. */ void EVENT_USB_Device_ControlRequest(void) { MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface); } 5' href='#n185'>185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646