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

1 files changed, 250 insertions, 0 deletions

diff --git a/lib/lufa/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c b/lib/lufa/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c
new file mode 100644
index 000000000..2e56d7f35
--- /dev/null
+++ b/lib/lufa/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.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 AudioOutputHost demo. This file contains the main tasks of
+ *  the demo and is responsible for the initial application hardware configuration.
+ */
+
+#include "AudioOutputHost.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 Output 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);
+	Buttons_Init();
+	ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
+	ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
+	LEDs_Init();
+	USB_Init();
+
+	/* Create a stdio stream for the serial port for stdin and stdout */
+	Serial_CreateStream(NULL);
+
+	/* Start the ADC conversion in free running mode */
+	ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL));
+}
+
+/** 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
+
+	puts_P(PSTR("Speaker 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 endpoint with the next sample. */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)
+{
+	uint8_t PrevPipe = Pipe_GetCurrentPipe();
+
+	Pipe_SelectPipe(AUDIO_DATA_OUT_PIPE);
+	Pipe_Unfreeze();
+
+	/* Check if the current pipe can be written to (device ready for more data) */
+	if (Pipe_IsOUTReady())
+	{
+		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
+
+		Pipe_Write_16_LE(AudioSample);
+		Pipe_Write_16_LE(AudioSample);
+
+		if (!(Pipe_IsReadWriteAllowed()))
+		  Pipe_ClearOUT();
+	}
+
+	Pipe_Freeze();
+	Pipe_SelectPipe(PrevPipe);
+}
+