Add svn:eol-style property to source files, so that the line endings are correctly converted to the target system's native end of line style.
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Dean Camera
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839 changed files with 274562 additions and 274562 deletions
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the Audio Input demo. This file contains the main tasks of the demo and
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* is responsible for the initial application hardware configuration.
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*/
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#include "AudioInput.h"
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/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
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bool StreamingAudioInterfaceSelected = false;
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/** Main program entry point. This routine contains the overall program flow, including initial
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* setup of all components and the main program loop.
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*/
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int main(void)
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{
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SetupHardware();
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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sei();
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for (;;)
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{
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USB_Audio_Task();
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USB_USBTask();
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Hardware Initialization */
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LEDs_Init();
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ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
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ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
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USB_Init();
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/* Start the ADC conversion in free running mode */
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ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_MUX_MASK);
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}
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and
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* configures the sample update and PWM timers.
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*/
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void EVENT_USB_Device_Connect(void)
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{
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/* Indicate USB enumerating */
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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/* Sample reload timer initialization */
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OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
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TCCR0A = (1 << WGM01); // CTC mode
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TCCR0B = (1 << CS01); // Fcpu/8 speed
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.
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*/
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void EVENT_USB_Device_Disconnect(void)
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{
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/* Stop the sample reload timer */
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TCCR0B = 0;
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/* Indicate streaming audio interface not selected */
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StreamingAudioInterfaceSelected = false;
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/* Indicate USB not ready */
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
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* of the USB device after enumeration - the device endpoints are configured.
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*/
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void EVENT_USB_Device_ConfigurationChanged(void)
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{
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/* Indicate USB connected and ready */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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/* Setup audio stream endpoint */
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if (!(Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,
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ENDPOINT_DIR_IN, AUDIO_STREAM_EPSIZE,
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ENDPOINT_BANK_DOUBLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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}
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/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
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* control requests that are not handled internally by the USB library (including the Audio class-specific
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* requests) so that they can be handled appropriately for the application.
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*/
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void EVENT_USB_Device_UnhandledControlRequest(void)
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{
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/* Process General and Audio specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case REQ_SetInterface:
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/* Set Interface is not handled by the library, as its function is application-specific */
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
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StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0);
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Endpoint_ClearStatusStage();
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}
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break;
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}
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}
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/** Task to manage the Audio interface, reading in ADC samples from the microphone, and them to the host. */
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void USB_Audio_Task(void)
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{
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/* Device must be connected and configured for the task to run */
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if (USB_DeviceState != DEVICE_STATE_Configured)
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return;
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/* Check to see if the streaming interface is selected, if not the host is not receiving audio */
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if (!(StreamingAudioInterfaceSelected))
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return;
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/* Select the audio stream endpoint */
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Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);
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/* Check if the current endpoint can be written to and that the next sample should be stored */
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if (Endpoint_IsINReady() && (TIFR0 & (1 << OCF0A)))
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{
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/* Clear the sample reload timer */
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TIFR0 |= (1 << OCF0A);
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/* Audio sample is ADC value scaled to fit the entire range */
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int16_t AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
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#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
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/* Microphone is biased to half rail voltage, subtract the bias from the sample value */
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AudioSample -= (SAMPLE_MAX_RANGE / 2);
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#endif
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/* Write the sample to the buffer */
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Endpoint_Write_Word_LE(AudioSample);
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/* Check to see if the bank is now full */
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if (!(Endpoint_IsReadWriteAllowed()))
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{
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/* Send the full packet to the host */
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Endpoint_ClearIN();
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}
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}
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}
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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||||
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
|
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the Audio Input demo. This file contains the main tasks of the demo and
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* is responsible for the initial application hardware configuration.
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*/
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#include "AudioInput.h"
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/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
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bool StreamingAudioInterfaceSelected = false;
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/** Main program entry point. This routine contains the overall program flow, including initial
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* setup of all components and the main program loop.
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*/
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int main(void)
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{
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SetupHardware();
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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sei();
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for (;;)
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{
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USB_Audio_Task();
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USB_USBTask();
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Hardware Initialization */
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LEDs_Init();
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ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
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ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
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USB_Init();
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/* Start the ADC conversion in free running mode */
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ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_MUX_MASK);
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}
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and
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* configures the sample update and PWM timers.
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*/
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void EVENT_USB_Device_Connect(void)
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{
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/* Indicate USB enumerating */
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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/* Sample reload timer initialization */
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OCR0A = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
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TCCR0A = (1 << WGM01); // CTC mode
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TCCR0B = (1 << CS01); // Fcpu/8 speed
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.
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*/
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void EVENT_USB_Device_Disconnect(void)
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{
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/* Stop the sample reload timer */
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TCCR0B = 0;
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/* Indicate streaming audio interface not selected */
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StreamingAudioInterfaceSelected = false;
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/* Indicate USB not ready */
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
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* of the USB device after enumeration - the device endpoints are configured.
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*/
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void EVENT_USB_Device_ConfigurationChanged(void)
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{
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/* Indicate USB connected and ready */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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/* Setup audio stream endpoint */
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if (!(Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,
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ENDPOINT_DIR_IN, AUDIO_STREAM_EPSIZE,
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ENDPOINT_BANK_DOUBLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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}
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/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
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* control requests that are not handled internally by the USB library (including the Audio class-specific
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* requests) so that they can be handled appropriately for the application.
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*/
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void EVENT_USB_Device_UnhandledControlRequest(void)
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{
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/* Process General and Audio specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case REQ_SetInterface:
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/* Set Interface is not handled by the library, as its function is application-specific */
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
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StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0);
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Endpoint_ClearStatusStage();
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}
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break;
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}
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}
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/** Task to manage the Audio interface, reading in ADC samples from the microphone, and them to the host. */
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void USB_Audio_Task(void)
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{
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/* Device must be connected and configured for the task to run */
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if (USB_DeviceState != DEVICE_STATE_Configured)
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return;
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/* Check to see if the streaming interface is selected, if not the host is not receiving audio */
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if (!(StreamingAudioInterfaceSelected))
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return;
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/* Select the audio stream endpoint */
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Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);
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/* Check if the current endpoint can be written to and that the next sample should be stored */
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if (Endpoint_IsINReady() && (TIFR0 & (1 << OCF0A)))
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{
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/* Clear the sample reload timer */
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TIFR0 |= (1 << OCF0A);
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/* Audio sample is ADC value scaled to fit the entire range */
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int16_t AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
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#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
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/* Microphone is biased to half rail voltage, subtract the bias from the sample value */
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AudioSample -= (SAMPLE_MAX_RANGE / 2);
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#endif
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/* Write the sample to the buffer */
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Endpoint_Write_Word_LE(AudioSample);
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/* Check to see if the bank is now full */
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if (!(Endpoint_IsReadWriteAllowed()))
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{
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/* Send the full packet to the host */
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Endpoint_ClearIN();
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}
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}
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}
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