Merge commit '60b30c036397cb5627fa374bb930794b225daa29' as 'lib/lufa'

9 files changed, 3268 insertions, 0 deletions

diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.c b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.c
new file mode 100644
index 0000000000..9db4798a56
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.c
@@ -0,0 +1,250 @@
+/*
+             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 AudioInputHost demo. This file contains the main tasks of
+ *  the demo and is responsible for the initial application hardware configuration.
+ */
+
+#include "AudioInputHost.h"
+
+/** Main program entry point. This routine configures the hardware required by the application, then
+ *  enters a loop to run the application tasks in sequence.
+ */
+int main(void)
+{
+	SetupHardware();
+
+	puts_P(PSTR(ESC_FG_CYAN "Audio Input Host Demo running.\r\n" ESC_FG_WHITE));
+
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+	GlobalInterruptEnable();
+
+	for (;;)
+	{
+		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 */
+	Serial_Init(9600, false);
+	LEDs_Init();
+	USB_Init();
+
+	/* Create a stdio stream for the serial port for stdin and stdout */
+	Serial_CreateStream(NULL);
+}
+
+/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
+ *  starts the library USB task to begin the enumeration and USB management process.
+ */
+void EVENT_USB_Host_DeviceAttached(void)
+{
+	puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
+	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+}
+
+/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
+ *  stops the library USB task management process.
+ */
+void EVENT_USB_Host_DeviceUnattached(void)
+{
+	puts_P(PSTR(ESC_FG_GREEN "Device Unattached.\r\n" ESC_FG_WHITE));
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+}
+
+/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
+ *  enumerated by the host and is now ready to be used by the application.
+ */
+void EVENT_USB_Host_DeviceEnumerationComplete(void)
+{
+	puts_P(PSTR("Getting Config Data.\r\n"));
+
+	uint8_t ErrorCode;
+
+	/* Get and process the configuration descriptor data */
+	if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
+	{
+		if (ErrorCode == ControlError)
+		  puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
+		else
+		  puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
+
+		printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+		return;
+	}
+
+	/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
+	if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
+	{
+		printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
+		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+		return;
+	}
+
+	if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
+	                                                 StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
+	{
+		printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"
+		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+		USB_Host_SetDeviceConfiguration(0);
+		return;
+	}
+
+	USB_ControlRequest = (USB_Request_Header_t)
+		{
+			.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),
+			.bRequest      = AUDIO_REQ_SetCurrent,
+			.wValue        = (AUDIO_EPCONTROL_SamplingFreq << 8),
+			.wIndex        = StreamingEndpointAddress,
+			.wLength       = sizeof(USB_Audio_SampleFreq_t),
+		};
+
+	USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
+
+	/* Select the control pipe for the request transfer */
+	Pipe_SelectPipe(PIPE_CONTROLPIPE);
+
+	/* Set the sample rate on the streaming interface endpoint */
+	if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
+	{
+		printf_P(PSTR(ESC_FG_RED "Could not set requested Audio sample rate.\r\n"
+		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
+
+		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+		USB_Host_SetDeviceConfiguration(0);
+		return;
+	}
+
+	/* Sample reload timer initialization */
+	TIMSK0  = (1 << OCIE0A);
+	OCR0A   = ((F_CPU / 8 / 48000) - 1);
+	TCCR0A  = (1 << WGM01);  // CTC mode
+	TCCR0B  = (1 << CS01);   // Fcpu/8 speed
+
+	/* Set speaker as output */
+	DDRC   |= (1 << 6);
+
+	/* PWM speaker timer initialization */
+	TCCR3A  = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
+	TCCR3B  = ((1 << WGM32) | (1 << CS30));  // Fast 8-Bit PWM, F_CPU speed
+
+	puts_P(PSTR("Microphone Enumerated.\r\n"));
+	LEDs_SetAllLEDs(LEDMASK_USB_READY);
+}
+
+/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
+void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
+{
+	USB_Disable();
+
+	printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
+	                         " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
+
+	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+	for(;;);
+}
+
+/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
+ *  enumerating an attached USB device.
+ */
+void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
+                                            const uint8_t SubErrorCode)
+{
+	printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
+	                         " -- Error Code %d\r\n"
+	                         " -- Sub Error Code %d\r\n"
+	                         " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
+
+	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
+}
+
+/** ISR to handle the reloading of the PWM timer with the next sample. */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)
+{
+	uint8_t PrevPipe = Pipe_GetCurrentPipe();
+
+	Pipe_SelectPipe(AUDIO_DATA_IN_PIPE);
+	Pipe_Unfreeze();
+
+	/* Check if the current pipe can be read from (contains a packet) and the device is sending data */
+	if (Pipe_IsINReceived())
+	{
+		/* Retrieve the signed 16-bit audio sample, convert to 8-bit */
+		int8_t Sample_8Bit = (Pipe_Read_16_LE() >> 8);
+
+		/* Check to see if the bank is now empty */
+		if (!(Pipe_IsReadWriteAllowed()))
+		{
+			/* Acknowledge the packet, clear the bank ready for the next packet */
+			Pipe_ClearIN();
+		}
+
+		/* Load the sample into the PWM timer channel */
+		OCR3A = (Sample_8Bit ^ (1 << 7));
+
+		uint8_t LEDMask = LEDS_NO_LEDS;
+
+		/* Turn on LEDs as the sample amplitude increases */
+		if (Sample_8Bit > 16)
+		  LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);
+		else if (Sample_8Bit > 8)
+		  LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);
+		else if (Sample_8Bit > 4)
+		  LEDMask = (LEDS_LED1 | LEDS_LED2);
+		else if (Sample_8Bit > 2)
+		  LEDMask = (LEDS_LED1);
+
+		LEDs_SetAllLEDs(LEDMask);
+	}
+
+	Pipe_Freeze();
+	Pipe_SelectPipe(PrevPipe);
+}
+
diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.h b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.h
new file mode 100644
index 0000000000..cc83270f61
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.h
@@ -0,0 +1,79 @@
+/*
+             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
+ *
+ *  Header file for AudioInputHost.c.
+ */
+
+#ifndef _AUDIO_INPUT_HOST_H_
+#define _AUDIO_INPUT_HOST_H_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/wdt.h>
+		#include <avr/pgmspace.h>
+		#include <avr/power.h>
+		#include <avr/interrupt.h>
+		#include <stdio.h>
+
+		#include <LUFA/Drivers/Misc/TerminalCodes.h>
+		#include <LUFA/Drivers/USB/USB.h>
+		#include <LUFA/Drivers/Peripheral/Serial.h>
+		#include <LUFA/Drivers/Board/LEDs.h>
+		#include <LUFA/Platform/Platform.h>
+
+		#include "ConfigDescriptor.h"
+
+	/* Macros: */
+		/** LED mask for the library LED driver, to indicate that the USB interface is not ready. */
+		#define LEDMASK_USB_NOTREADY      LEDS_LED1
+
+		/** LED mask for the library LED driver, to indicate that the USB interface is enumerating. */
+		#define LEDMASK_USB_ENUMERATING  (LEDS_LED2 | LEDS_LED3)
+
+		/** LED mask for the library LED driver, to indicate that the USB interface is ready. */
+		#define LEDMASK_USB_READY        (LEDS_LED2 | LEDS_LED4)
+
+		/** LED mask for the library LED driver, to indicate that an error has occurred in the USB interface. */
+		#define LEDMASK_USB_ERROR        (LEDS_LED1 | LEDS_LED3)
+
+	/* Function Prototypes: */
+		void SetupHardware(void);
+
+		void EVENT_USB_Host_HostError(const uint8_t ErrorCode);
+		void EVENT_USB_Host_DeviceAttached(void);
+		void EVENT_USB_Host_DeviceUnattached(void);
+		void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
+		                                            const uint8_t SubErrorCode);
+		void EVENT_USB_Host_DeviceEnumerationComplete(void);
+
+#endif
+
diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.txt b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.txt
new file mode 100644
index 0000000000..0736e0df47
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/AudioInputHost.txt
@@ -0,0 +1,66 @@
+/** \file
+ *
+ *  This file contains special DoxyGen information for the generation of the main page and other special
+ *  documentation pages. It is not a project source file.
+ */
+
+/** \mainpage Audio Input Host Demo
+ *
+ *  \section Sec_Compat Demo Compatibility:
+ *
+ *  The following list indicates what microcontrollers are compatible with this demo.
+ *
+ *  \li Series 7 USB AVRs (AT90USBxxx7)
+ *
+ *  \section Sec_Info USB Information:
+ *
+ *  The following table gives a rundown of the USB utilization of this demo.
+ *
+ *  <table>
+ *   <tr>
+ *    <td><b>USB Mode:</b></td>
+ *    <td>Host</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>USB Class:</b></td>
+ *    <td>Audio Class</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>USB Subclass:</b></td>
+ *    <td>Standard Audio Device</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Relevant Standards:</b></td>
+ *    <td>USBIF Audio 1.0 Class Specification \n
+ *        USBIF Audio 1.0 Class Terminal Types Specification \n
+ *        USBIF Audio 1.0 Data Formats Specification</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Supported USB Speeds:</b></td>
+ *    <td>Full Speed Mode</td>
+ *   </tr>
+ *  </table>
+ *
+ *  \section Sec_Description Project Description:
+ *
+ *  Audio Input host demonstration application. This gives a simple reference
+ *  application for implementing a USB Audio host, for USB Audio devices using
+ *  the USB Audio 1.0 class profile.
+ *
+ *  Incoming audio will output in 8-bit PWM onto the timer 3 output compare
+ *  channel A, and will also be indicated on the board LEDs. Decouple the PWM
+ *  output with a capacitor and attach to a speaker to hear the audio.
+ *
+ *  \section Sec_Options Project Options
+ *
+ *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
+ *
+ *  <table>
+ *   <tr>
+ *    <td>
+ *     None
+ *    </td>
+ *   </tr>
+ *  </table>
+ */
+
diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/Config/LUFAConfig.h b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/Config/LUFAConfig.h
new file mode 100644
index 0000000000..197122fce1
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/Config/LUFAConfig.h
@@ -0,0 +1,93 @@
+/*
+             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
+ *  \brief LUFA Library Configuration Header File
+ *
+ *  This header file is used to configure LUFA's compile time options,
+ *  as an alternative to the compile time constants supplied through
+ *  a makefile.
+ *
+ *  For information on what each token does, refer to the LUFA
+ *  manual section "Summary of Compile Tokens".
+ */
+
+#ifndef _LUFA_CONFIG_H_
+#define _LUFA_CONFIG_H_
+
+	#if (ARCH == ARCH_AVR8)
+
+		/* Non-USB Related Configuration Tokens: */
+//		#define DISABLE_TERMINAL_CODES
+
+		/* USB Class Driver Related Tokens: */
+//		#define HID_HOST_BOOT_PROTOCOL_ONLY
+//		#define HID_STATETABLE_STACK_DEPTH       {Insert Value Here}
+//		#define HID_USAGE_STACK_DEPTH            {Insert Value Here}
+//		#define HID_MAX_COLLECTIONS              {Insert Value Here}
+//		#define HID_MAX_REPORTITEMS              {Insert Value Here}
+//		#define HID_MAX_REPORT_IDS               {Insert Value Here}
+//		#define NO_CLASS_DRIVER_AUTOFLUSH
+
+		/* General USB Driver Related Tokens: */
+//		#define ORDERED_EP_CONFIG
+		#define USE_STATIC_OPTIONS               (USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)
+//		#define USB_DEVICE_ONLY
+		#define USB_HOST_ONLY
+//		#define USB_STREAM_TIMEOUT_MS            {Insert Value Here}
+//		#define NO_LIMITED_CONTROLLER_CONNECT
+//		#define NO_SOF_EVENTS
+
+		/* USB Device Mode Driver Related Tokens: */
+//		#define USE_RAM_DESCRIPTORS
+//		#define USE_FLASH_DESCRIPTORS
+//		#define USE_EEPROM_DESCRIPTORS
+//		#define NO_INTERNAL_SERIAL
+//		#define FIXED_CONTROL_ENDPOINT_SIZE      {Insert Value Here}
+//		#define DEVICE_STATE_AS_GPIOR            {Insert Value Here}
+//		#define FIXED_NUM_CONFIGURATIONS         {Insert Value Here}
+//		#define CONTROL_ONLY_DEVICE
+//		#define INTERRUPT_CONTROL_ENDPOINT
+//		#define NO_DEVICE_REMOTE_WAKEUP
+//		#define NO_DEVICE_SELF_POWER
+
+		/* USB Host Mode Driver Related Tokens: */
+//		#define HOST_STATE_AS_GPIOR              {Insert Value Here}
+//		#define USB_HOST_TIMEOUT_MS              {Insert Value Here}
+//		#define HOST_DEVICE_SETTLE_DELAY_MS	     {Insert Value Here}
+//		#define NO_AUTO_VBUS_MANAGEMENT
+//		#define INVERTED_VBUS_ENABLE_LINE
+
+	#else
+
+		#error Unsupported architecture for this LUFA configuration file.
+
+	#endif
+#endif
diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.c b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.c
new file mode 100644
index 0000000000..81ebf9d85f
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.c
@@ -0,0 +1,220 @@
+/*
+             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
+ *
+ *  USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations
+ *  needed to communication with an attached USB device. Descriptors are special  computer-readable structures
+ *  which the host requests upon device enumeration, to determine the device's capabilities and functions.
+ */
+
+#include "ConfigDescriptor.h"
+
+/** Index of the currently used Audio Streaming Interface within the device. */
+uint8_t StreamingInterfaceIndex      = 0;
+
+/** Alternative Setting of the currently used Audio Streaming Interface within the device. */
+uint8_t StreamingInterfaceAltSetting = 0;
+
+/** Address of the streaming audio endpoint currently in use within the device. */
+uint8_t StreamingEndpointAddress     = 0;
+
+
+/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This
+ *  routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate
+ *  with compatible devices.
+ *
+ *  This routine searches for a Streaming Audio interface descriptor containing a valid Isochronous audio endpoint.
+ *
+ *  \return An error code from the \ref AudioHost_GetConfigDescriptorDataCodes_t enum.
+ */
+uint8_t ProcessConfigurationDescriptor(void)
+{
+	uint8_t  ConfigDescriptorData[512];
+	void*    CurrConfigLocation = ConfigDescriptorData;
+	uint16_t CurrConfigBytesRem;
+
+	USB_Descriptor_Interface_t* AudioControlInterface   = NULL;
+	USB_Descriptor_Interface_t* AudioStreamingInterface = NULL;
+	USB_Descriptor_Endpoint_t*  DataINEndpoint          = NULL;
+
+	/* Retrieve the entire configuration descriptor into the allocated buffer */
+	switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
+	{
+		case HOST_GETCONFIG_Successful:
+			break;
+		case HOST_GETCONFIG_InvalidData:
+			return InvalidConfigDataReturned;
+		case HOST_GETCONFIG_BuffOverflow:
+			return DescriptorTooLarge;
+		default:
+			return ControlError;
+	}
+
+	while (!(DataINEndpoint))
+	{
+		/* See if we've found a likely compatible interface, and if there is an endpoint within that interface */
+		if (!(AudioControlInterface) ||
+		    USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+		                              DComp_NextAudioInterfaceDataEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
+		{
+			/* Check if we haven't found an Audio Control interface yet, or if we have run out of related Audio Streaming interfaces */
+			if (!(AudioControlInterface) ||
+			    USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+			                              DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+			{
+				/* Find a new Audio Control interface if the current one doesn't contain a compatible streaming interface */
+				if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+				                              DComp_NextAudioControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+				{
+					/* Descriptor not found, error out */
+					return NoCompatibleInterfaceFound;
+				}
+
+				/* Save the interface in case we need to refer back to it later */
+				AudioControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+
+				/* Find the next Audio Streaming interface within that Audio Control interface */
+				if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
+				                              DComp_NextAudioStreamInterface) != DESCRIPTOR_SEARCH_COMP_Found)
+				{
+					/* Descriptor not found, error out */
+					return NoCompatibleInterfaceFound;
+				}
+			}
+
+			/* Save the interface in case we need to refer back to it later */
+			AudioStreamingInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
+
+			/* Skip the remainder of the loop as we have not found an endpoint yet */
+			continue;
+		}
+
+		/* Retrieve the endpoint address from the endpoint descriptor */
+		USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
+
+		/* Save the endpoint if it is an IN type endpoint */
+		if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN)
+		  DataINEndpoint = EndpointData;
+	}
+
+	StreamingInterfaceIndex      = AudioStreamingInterface->InterfaceNumber;
+	StreamingInterfaceAltSetting = AudioStreamingInterface->AlternateSetting;
+	StreamingEndpointAddress     = DataINEndpoint->EndpointAddress;
+
+	/* Configure the Audio data IN pipe */
+	Pipe_ConfigurePipe(AUDIO_DATA_IN_PIPE, EP_TYPE_ISOCHRONOUS, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, 2);
+
+	/* Valid data found, return success */
+	return SuccessfulConfigRead;
+}
+
+/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
+ *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
+ *  descriptor processing if an incompatible descriptor configuration is found.
+ *
+ *  This comparator searches for the next Interface descriptor of the correct Audio Control Class, Subclass and Protocol values.
+ *
+ *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor)
+{
+	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
+	if (Header->Type == DTYPE_Interface)
+	{
+		USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
+
+		if ((Interface->Class    == AUDIO_CSCP_AudioClass) &&
+		    (Interface->SubClass == AUDIO_CSCP_ControlSubclass) &&
+		    (Interface->Protocol == AUDIO_CSCP_ControlProtocol))
+		{
+			return DESCRIPTOR_SEARCH_Found;
+		}
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+
+/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
+ *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
+ *  descriptor processing if an incompatible descriptor configuration is found.
+ *
+ *  This comparator searches for the next Interface descriptor of the correct Audio Streaming Class, Subclass and Protocol values.
+ *
+ *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor)
+{
+	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
+	if (Header->Type == DTYPE_Interface)
+	{
+		USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
+
+		if ((Interface->Class    == AUDIO_CSCP_AudioClass) &&
+		    (Interface->SubClass == AUDIO_CSCP_AudioStreamingSubclass) &&
+		    (Interface->Protocol == AUDIO_CSCP_StreamingProtocol))
+		{
+			return DESCRIPTOR_SEARCH_Found;
+		}
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+
+/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
+ *  configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
+ *  descriptor processing if an incompatible descriptor configuration is found.
+ *
+ *  This comparator searches for the next Isochronous Endpoint descriptor within the current interface, aborting the
+ *  search if another interface descriptor is found before the next endpoint.
+ *
+ *  \return A value from the DSEARCH_Return_ErrorCodes_t enum
+ */
+uint8_t DComp_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor)
+{
+	USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
+
+	if (Header->Type == DTYPE_Endpoint)
+	{
+		USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);
+
+		if ((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_ISOCHRONOUS)
+		  return DESCRIPTOR_SEARCH_Found;
+	}
+	else if (Header->Type == DTYPE_Interface)
+	{
+		return DESCRIPTOR_SEARCH_Fail;
+	}
+
+	return DESCRIPTOR_SEARCH_NotFound;
+}
+
diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.h b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.h
new file mode 100644
index 0000000000..036319d723
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/ConfigDescriptor.h
@@ -0,0 +1,72 @@
+/*
+             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
+ *
+ *  Header file for ConfigDescriptor.c.
+ */
+
+#ifndef _CONFIGDESCRIPTOR_H_
+#define _CONFIGDESCRIPTOR_H_
+
+	/* Includes: */
+		#include <LUFA/Drivers/USB/USB.h>
+
+		#include "AudioInputHost.h"
+
+	/* Macros: */
+		/** Pipe address for the Audio data IN pipe. */
+		#define AUDIO_DATA_IN_PIPE          (PIPE_DIR_IN | 1)
+
+	/* Enums: */
+		/** Enum for the possible return codes of the \ref ProcessConfigurationDescriptor() function. */
+		enum AudioHost_GetConfigDescriptorDataCodes_t
+		{
+			SuccessfulConfigRead            = 0, /**< Configuration Descriptor was processed successfully */
+			ControlError                    = 1, /**< A control request to the device failed to complete successfully */
+			DescriptorTooLarge              = 2, /**< The device's Configuration Descriptor is too large to process */
+			InvalidConfigDataReturned       = 3, /**< The device returned an invalid Configuration Descriptor */
+			NoCompatibleInterfaceFound      = 4, /**< A compatible interface with the required endpoints was not found */
+		};
+
+	/* External Variables: */
+		extern uint8_t StreamingInterfaceIndex;
+		extern uint8_t StreamingInterfaceAltSetting;
+		extern uint8_t StreamingEndpointAddress;
+
+	/* Function Prototypes: */
+		uint8_t ProcessConfigurationDescriptor(void);
+
+		uint8_t DComp_NextAudioControlInterface(void* CurrentDescriptor);
+		uint8_t DComp_NextAudioStreamInterface(void* CurrentDescriptor);
+		uint8_t DComp_NextAudioInterfaceDataEndpoint(void* CurrentDescriptor);
+
+#endif
+
diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/asf.xml b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/asf.xml
new file mode 100644
index 0000000000..f6defd91d7
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/asf.xml
@@ -0,0 +1,50 @@
+<asf xmlversion="1.0">

+	<project caption="Audio Input Host Demo (Low Level APIs)" id="lufa.demos.host.lowlevel.audio_input.example.avr8">

+		<require idref="lufa.demos.host.lowlevel.audio_input"/>

+		<require idref="lufa.boards.dummy.avr8"/>

+		<generator value="as5_8"/>

+

+		<device-support value="at90usb1287"/>

+		<config name="lufa.drivers.board.name" value="none"/>

+

+		<build type="define" name="F_CPU" value="16000000UL"/>

+		<build type="define" name="F_USB" value="16000000UL"/>

+	</project>

+

+	<module type="application" id="lufa.demos.host.lowlevel.audio_input" caption="Audio Input Host Demo (Low Level APIs)">

+		<info type="description" value="summary">

+		Audio Input Host demo, implementing a basic USB audio sink that can output incoming audio data to a speaker. This demo uses the Low Level LUFA APIs to manually implement a USB Class for demonstration purposes without using the simpler in-built LUFA Class Driver APIs.

+		</info>

+

+ 		<info type="gui-flag" value="move-to-root"/>

+

+		<info type="keyword" value="Technology">

+			<keyword value="Low Level APIs"/>

+			<keyword value="USB Host"/>

+			<keyword value="Audio Class"/>

+		</info>

+

+		<device-support-alias value="lufa_avr8"/>

+		<device-support-alias value="lufa_xmega"/>

+		<device-support-alias value="lufa_uc3"/>

+

+		<build type="distribute" subtype="user-file" value="doxyfile"/>

+		<build type="distribute" subtype="user-file" value="AudioInputHost.txt"/>

+

+		<build type="c-source" value="AudioInputHost.c"/>

+		<build type="c-source" value="ConfigDescriptor.c"/>

+		<build type="header-file" value="AudioInputHost.h"/>

+		<build type="header-file" value="ConfigDescriptor.h"/>

+

+		<build type="module-config" subtype="path" value="Config"/>

+		<build type="header-file" value="Config/LUFAConfig.h"/>

+

+		<require idref="lufa.common"/>

+		<require idref="lufa.platform"/>

+		<require idref="lufa.drivers.usb"/>

+		<require idref="lufa.drivers.peripheral.usart"/>

+		<require idref="lufa.drivers.misc.ansi"/>

+		<require idref="lufa.drivers.board"/>

+		<require idref="lufa.drivers.board.leds"/>

+	</module>

+</asf>

diff --git a/lib/lufa/Demos/Host/LowLevel/AudioInputHost/doxyfile b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/doxyfile
new file mode 100644
index 0000000000..dda0086588
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioInputHost/doxyfile
@@ -0,0 +1,2395 @@
+# Doxyfile 1.8.9
+
+# This file describes the settings to be used by the documentation system
+# doxygen (www.doxygen.org) for a project.
+#
+# All text after a double hash (##) is considered a comment and is placed in