diff options
Diffstat (limited to 'Demos/Device/ClassDriver/AudioInput/AudioInput.c')
| -rw-r--r-- | Demos/Device/ClassDriver/AudioInput/AudioInput.c | 296 |
1 files changed, 148 insertions, 148 deletions
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); +} |