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diff --git a/lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c b/lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c
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+/*
+ 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 AudioOutput demo. This file contains the main tasks of
+ * the demo and is responsible for the initial application hardware configuration.
+ */
+
+#include "AudioOutput.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 Speaker_Audio_Interface =
+ {
+ .Config =
+ {
+ .ControlInterfaceNumber = INTERFACE_ID_AudioControl,
+ .StreamingInterfaceNumber = INTERFACE_ID_AudioStream,
+ .DataOUTEndpoint =
+ {
+ .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(&Speaker_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();
+ USB_Init();
+}
+
+/** ISR to handle the reloading of the PWM timer 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 read */
+ if (Audio_Device_IsSampleReceived(&Speaker_Audio_Interface))
+ {
+ /* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */
+ int8_t LeftSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
+ int8_t RightSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
+
+ /* Mix the two channels together to produce a mono, 8-bit sample */
+ int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
+
+ #if defined(AUDIO_OUT_MONO)
+ /* Load the sample into the PWM timer channel */
+ OCR3A = (MixedSample_8Bit ^ (1 << 7));
+ #elif defined(AUDIO_OUT_STEREO)
+ /* Load the dual 8-bit samples into the PWM timer channels */
+ OCR3A = (LeftSample_8Bit ^ (1 << 7));
+ OCR3B = (RightSample_8Bit ^ (1 << 7));
+ #elif defined(AUDIO_OUT_PORTC)
+ /* Load the 8-bit mixed sample into PORTC */
+ PORTC = MixedSample_8Bit;
+ #endif
+
+ uint8_t LEDMask = LEDS_NO_LEDS;
+
+ /* Turn on LEDs as the sample amplitude increases */
+ if (MixedSample_8Bit > 16)
+ LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);
+ else if (MixedSample_8Bit > 8)
+ LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);
+ else if (MixedSample_8Bit > 4)
+ LEDMask = (LEDS_LED1 | LEDS_LED2);
+ else if (MixedSample_8Bit > 2)
+ LEDMask = (LEDS_LED1);
+
+ LEDs_SetAllLEDs(LEDMask);
+ }
+
+ 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
+
+ #if defined(AUDIO_OUT_MONO)
+ /* Set speaker as output */
+ DDRC |= (1 << 6);
+ #elif defined(AUDIO_OUT_STEREO)
+ /* Set speakers as outputs */
+ DDRC |= ((1 << 6) | (1 << 5));
+ #elif defined(AUDIO_OUT_PORTC)
+ /* Set PORTC as outputs */
+ DDRC |= 0xFF;
+ #endif
+
+ #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ /* PWM speaker timer initialization */
+ TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)
+ | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP
+ TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, F_CPU speed
+ #endif
+}
+
+/** Event handler for the library USB Disconnection event. */
+void EVENT_USB_Device_Disconnect(void)
+{
+ LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+
+ /* Stop the sample reload timer */
+ TCCR0B = 0;
+
+ #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
+ /* Stop the PWM generation timer */
+ TCCR3B = 0;
+ #endif
+
+ #if defined(AUDIO_OUT_MONO)
+ /* Set speaker as input to reduce current draw */
+ DDRC &= ~(1 << 6);
+ #elif defined(AUDIO_OUT_STEREO)
+ /* Set speakers as inputs to reduce current draw */
+ DDRC &= ~((1 << 6) | (1 << 5));
+ #elif defined(AUDIO_OUT_PORTC)
+ /* Set PORTC low */
+ PORTC = 0x00;
+ #endif
+}
+
+/** Event handler for the library USB Configuration Changed event. */
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+ bool ConfigSuccess = true;
+
+ ConfigSuccess &= Audio_Device_ConfigureEndpoints(&Speaker_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(&Speaker_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 == Speaker_Audio_Interface.Config.DataOUTEndpoint.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;
+}