diff options
Diffstat (limited to 'lib/lufa/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c')
| -rw-r--r-- | lib/lufa/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c | 250 | 
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 0000000000..2e56d7f356 --- /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); +} + | 
