X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/e331b531c6e6d93eb0eee42b9002074e8090ad18..071e02c6b6b4837fa9cf0b6d4c749994e02638d7:/Demos/Device/ClassDriver/AudioInput/AudioInput.c diff --git a/Demos/Device/ClassDriver/AudioInput/AudioInput.c b/Demos/Device/ClassDriver/AudioInput/AudioInput.c index 09a2f0f01..dd0028a55 100644 --- a/Demos/Device/ClassDriver/AudioInput/AudioInput.c +++ b/Demos/Device/ClassDriver/AudioInput/AudioInput.c @@ -1,148 +1,148 @@ -/* - 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); -} +/* + 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); +}