/* LUFA Library Copyright (C) Dean Camera, 2017. dean [at] fourwalledcubicle [dot] com www.lufa-lib.org */ /* Copyright 2017 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 AudioInput demo. This file contains the main tasks of * the demo and is responsible for the initial application hardware configuration. */ #include "AudioInput.h" /** LUFA Audio Class driver interface configuration and state information. This structure is * passed to all Audio Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. */ USB_ClassInfo_Audio_Device_t Microphone_Audio_Interface = { .Config = { .ControlInterfaceNumber = INTERFACE_ID_AudioControl, .StreamingInterfaceNumber = INTERFACE_ID_AudioStream, .DataINEndpoint = { .Address = AUDIO_STREAM_EPADDR, .Size = AUDIO_STREAM_EPSIZE, .Banks = 2, }, }, }; /** Current audio sampling frequency of the streaming audio endpoint. */ static uint32_t CurrentAudioSampleFrequency = 48000; /** 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 (;;) { Audio_Device_USBTask(&Microphone_Audio_Interface); USB_USBTask(); } } /** 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(); Buttons_Init(); ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32); ADC_SetupChannel(MIC_IN_ADC_CHANNEL); USB_Init(); /* Start the ADC conversion in free running mode */ ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL)); } /** ISR to handle the reloading of the data endpoint with the next sample. */ ISR(TIMER0_COMPA_vect, ISR_BLOCK) { uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint(); /* Check that the USB bus is ready for the next sample to write */ if (Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface)) { int16_t AudioSample; #if defined(USE_TEST_TONE) static uint8_t SquareWaveSampleCount; static int16_t CurrentWaveValue; /* In test tone mode, generate a square wave at 1/256 of the sample rate */ if (SquareWaveSampleCount++ == 0xFF) CurrentWaveValue ^= 0x8000; /* Only generate audio if the board button is being pressed */ AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0; #else /* Audio sample is ADC value scaled to fit the entire range */ AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult()); #if defined(MICROPHONE_BIASED_TO_HALF_RAIL) /* Microphone is biased to half rail voltage, subtract the bias from the sample value */ AudioSample -= (SAMPLE_MAX_RANGE / 2); #endif #endif Audio_Device_WriteSample16(&Microphone_Audio_Interface, AudioSample); } Endpoint_SelectEndpoint(PrevEndpoint); } /** Event handler for the library USB Connection event. */ void EVENT_USB_Device_Connect(void) { LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); /* Sample reload timer initialization */ TIMSK0 = (1 << OCIE0A); OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1); TCCR0A = (1 << WGM01); // CTC mode TCCR0B = (1 << CS01); // Fcpu/8 speed } /** Event handler for the library USB Disconnection event. */ void EVENT_USB_Device_Disconnect(void) { /* Stop the sample reload timer */ TCCR0B = 0; LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); } /** Event handler for the library USB Configuration Changed event. */ void EVENT_USB_Device_ConfigurationChanged(void) { bool ConfigSuccess = true; ConfigSuccess &= Audio_Device_ConfigureEndpoints(&Microphone_Audio_Interface); LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR); } /** Event handler for the library USB Control Request reception event. */ void EVENT_USB_Device_ControlRequest(void) { Audio_Device_ProcessControlRequest(&Microphone_Audio_Interface); } /** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented * in the user application to handle property manipulations on streaming audio endpoints. * * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for * the given endpoint index, and should return as fast as possible. When non-NULL, this value may be altered for GET operations * to indicate the size of the retrieved data. * * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value * of the \c DataLength parameter. * * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. * \param[in] EndpointProperty Property of the endpoint to get or set, a value from Audio_ClassRequests_t. * \param[in] EndpointAddress Address of the streaming endpoint whose property is being referenced. * \param[in] EndpointControl Parameter of the endpoint to get or set, a value from Audio_EndpointControls_t. * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum * length of the retrieved data. When NULL, the function should return whether the given property * and parameter is valid for the requested endpoint without reading or modifying the Data buffer. * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where * the retrieved data is to be stored for GET operations. * * \return Boolean \c true if the property get/set was successful, \c false otherwise */ bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, const uint8_t EndpointProperty, const uint8_t EndpointAddress, const uint8_t EndpointControl, uint16_t* const DataLength, uint8_t* Data) { /* Check the requested endpoint to see if a supported endpoint is being manipulated */ if (EndpointAddress == Microphone_Audio_Interface.Config.DataINEndpoint.Address) { /* Check the requested control to see if a supported control is being manipulated */ if (EndpointControl == AUDIO_EPCONTROL_SamplingFreq) { switch (EndpointProperty) { case AUDIO_REQ_SetCurrent: /* Check if we are just testing for a valid property, or actually adjusting it */ if (DataLength != NULL) { /* Set the new sampling frequency to the value given by the host */ CurrentAudioSampleFrequency = (((uint32_t)Data[2] << 16) | ((uint32_t)Data[1] << 8) | (uint32_t)Data[0]); /* Adjust sample reload timer to the new frequency */ OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1); } return true; case AUDIO_REQ_GetCurrent: /* Check if we are just testing for a valid property, or actually reading it */ if (DataLength != NULL) { *DataLength = 3; Data[2] = (CurrentAudioSampleFrequency >> 16); Data[1] = (CurrentAudioSampleFrequency >> 8); Data[0] = (CurrentAudioSampleFrequency & 0xFF); } return true; } } } return false; } /** Audio class driver callback for the setting and retrieval of streaming interface properties. This callback must be implemented * in the user application to handle property manipulations on streaming audio interfaces. * * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for * the given entity and should return as fast as possible. When non-NULL, this value may be altered for GET operations * to indicate the size of the retrieved data. * * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value * of the \c DataLength parameter. * * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. * \param[in] Property Property of the interface to get or set, a value from Audio_ClassRequests_t. * \param[in] EntityAddress Address of the audio entity whose property is being referenced. * \param[in] Parameter Parameter of the entity to get or set, specific to each type of entity (see USB Audio specification). * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum * length of the retrieved data. When NULL, the function should return whether the given property * and parameter is valid for the requested endpoint without reading or modifying the Data buffer. * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where * the retrieved data is to be stored for GET operations. * * \return Boolean \c true if the property GET/SET was successful, \c false otherwise */ bool CALLBACK_Audio_Device_GetSetInterfaceProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, const uint8_t Property, const uint8_t EntityAddress, const uint16_t Parameter, uint16_t* const DataLength, uint8_t* Data) { /* No audio interface entities in the device descriptor, thus no properties to get or set. */ return false; } 244'>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