Skip to content
Snippets Groups Projects
Select Git revision
  • 0902ff9651d18bf6da259b73092fd33b841b4dc4
  • master default protected
  • LUFA-170418
  • LUFA-151115
  • LUFA-140928
  • LUFA-140302
  • LUFA-130901
  • LUFA-130901-BETA
  • LUFA-130303
  • LUFA-120730
  • LUFA-120730-BETA
  • LUFA-120219
  • LUFA-120219-BETA
  • LUFA-111009
  • LUFA-111009-BETA
  • LUFA-110528
  • LUFA-110528-BETA
17 results

AudioInput.c

Blame
  • AudioInput.c 4.55 KiB
    /*
                 LUFA Library
         Copyright (C) Dean Camera, 2010.
                  
      dean [at] fourwalledcubicle [dot] com
          www.fourwalledcubicle.com
    */
    
    /*
      Copyright 2010  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 disclaim 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 AudioInput demo. This file contains the main tasks of
     *  the demo and is responsible for the initial application hardware configuration.
     */
    
    #include "AudioInput.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 Microphone_Audio_Interface =
    	{
    		.Config =
    			{
    				.StreamingInterfaceNumber = 1,
    
    				.DataINEndpointNumber     = AUDIO_STREAM_EPNUM,
    				.DataINEndpointSize       = AUDIO_STREAM_EPSIZE,
    			},
    	};
    
    /** 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);
    	sei();
    	
    	for (;;)
    	{
    		ProcessNextSample();
    
    		Audio_Device_USBTask(&Microphone_Audio_Interface);
    		USB_USBTask();
    	}
    }
    
    /** Configures the board hardware and chip peripherals for the demo's functionality. */
    void SetupHardware(void)
    {
    	/* Disable watchdog if enabled by bootloader/fuses */
    	MCUSR &= ~(1 << WDRF);
    	wdt_disable();
    
    	/* Disable clock division */
    	clock_prescale_set(clock_div_1);
    	
    	/* Hardware Initialization */
    	LEDs_Init();
    	USB_Init();
    	ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
    	ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
    	
    	/* Start the ADC conversion in free running mode */
    	ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_MUX_MASK);
    }
    
    /** Processes the next audio sample by reading the last ADC conversion and writing it to the audio
     *  interface, each time the sample reload timer period elapses to give a constant sample rate.
     */
    void ProcessNextSample(void)
    {
    	/* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */
    	if ((TIFR0 & (1 << OCF0A)) && Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface))
    	{
    		TIFR0 |= (1 << OCF0A);
    
    		/* Audio sample is ADC value scaled to fit the entire range */
    		int16_t 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
    
    		Audio_Device_WriteSample16(&Microphone_Audio_Interface, AudioSample);
    	}
    }
    
    /** Event handler for the library USB Connection event. */
    void EVENT_USB_Device_Connect(void)
    {
    	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
    
    	/* Sample reload timer initialization */
    	OCR0A   = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
    	TCCR0A  = (1 << WGM01);  // CTC mode
    	TCCR0B  = (1 << CS01);   // Fcpu/8 speed
    }
    
    /** Event handler for the library USB Disconnection event. */
    void EVENT_USB_Device_Disconnect(void)
    {
    	/* Stop the sample reload timer */
    	TCCR0B = 0;
    
    	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
    }
    
    /** Event handler for the library USB Configuration Changed event. */
    void EVENT_USB_Device_ConfigurationChanged(void)
    {
    	LEDs_SetAllLEDs(LEDMASK_USB_READY);
    	
    	if (!(Audio_Device_ConfigureEndpoints(&Microphone_Audio_Interface)))
    	  LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
    }
    
    /** Event handler for the library USB Unhandled Control Request event. */
    void EVENT_USB_Device_UnhandledControlRequest(void)
    {
    	Audio_Device_ProcessControlRequest(&Microphone_Audio_Interface);
    }