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Diffstat (limited to 'lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c')
| -rw-r--r-- | lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c | 311 |
1 files changed, 0 insertions, 311 deletions
diff --git a/lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c b/lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c deleted file mode 100644 index 4c78deb9f6..0000000000 --- a/lib/lufa/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c +++ /dev/null @@ -1,311 +0,0 @@ -/* - 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 AudioOutput demo. This file contains the main tasks of - * the demo and is responsible for the initial application hardware configuration. - */ - -#include "AudioOutput.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 Speaker_Audio_Interface = - { - .Config = - { - .ControlInterfaceNumber = INTERFACE_ID_AudioControl, - .StreamingInterfaceNumber = INTERFACE_ID_AudioStream, - .DataOUTEndpoint = - { - .Address = AUDIO_STREAM_EPADDR, - .Size = AUDIO_STREAM_EPSIZE, - .Banks = 2, - }, - }, - }; - -/** Current audio sampling frequency of the streaming audio endpoint. */ -static uint32_t CurrentAudioSampleFrequency = 48000; - - -/** 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); - GlobalInterruptEnable(); - - for (;;) - { - Audio_Device_USBTask(&Speaker_Audio_Interface); - 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 */ - LEDs_Init(); - USB_Init(); -} - -/** ISR to handle the reloading of the PWM timer with the next sample. */ -ISR(TIMER0_COMPA_vect, ISR_BLOCK) -{ - uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint(); - - /* Check that the USB bus is ready for the next sample to read */ - if (Audio_Device_IsSampleReceived(&Speaker_Audio_Interface)) - { - /* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */ - int8_t LeftSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8); - int8_t RightSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8); - - /* Mix the two channels together to produce a mono, 8-bit sample */ - int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1); - - #if defined(AUDIO_OUT_MONO) - /* Load the sample into the PWM timer channel */ - OCR3A = (MixedSample_8Bit ^ (1 << 7)); - #elif defined(AUDIO_OUT_STEREO) - /* Load the dual 8-bit samples into the PWM timer channels */ - OCR3A = (LeftSample_8Bit ^ (1 << 7)); - OCR3B = (RightSample_8Bit ^ (1 << 7)); - #elif defined(AUDIO_OUT_PORTC) - /* Load the 8-bit mixed sample into PORTC */ - PORTC = MixedSample_8Bit; - #endif - - uint8_t LEDMask = LEDS_NO_LEDS; - - /* Turn on LEDs as the sample amplitude increases */ - if (MixedSample_8Bit > 16) - LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4); - else if (MixedSample_8Bit > 8) - LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3); - else if (MixedSample_8Bit > 4) - LEDMask = (LEDS_LED1 | LEDS_LED2); - else if (MixedSample_8Bit > 2) - LEDMask = (LEDS_LED1); - - LEDs_SetAllLEDs(LEDMask); - } - - Endpoint_SelectEndpoint(PrevEndpoint); -} - -/** Event handler for the library USB Connection event. */ -void EVENT_USB_Device_Connect(void) -{ - LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); - - /* Sample reload timer initialization */ - TIMSK0 = (1 << OCIE0A); - OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1); - TCCR0A = (1 << WGM01); // CTC mode - TCCR0B = (1 << CS01); // Fcpu/8 speed - - #if defined(AUDIO_OUT_MONO) - /* Set speaker as output */ - DDRC |= (1 << 6); - #elif defined(AUDIO_OUT_STEREO) - /* Set speakers as outputs */ - DDRC |= ((1 << 6) | (1 << 5)); - #elif defined(AUDIO_OUT_PORTC) - /* Set PORTC as outputs */ - DDRC |= 0xFF; - #endif - - #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO)) - /* PWM speaker timer initialization */ - TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0) - | (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP - TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, F_CPU speed - #endif -} - -/** Event handler for the library USB Disconnection event. */ -void EVENT_USB_Device_Disconnect(void) -{ - LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); - - /* Stop the sample reload timer */ - TCCR0B = 0; - - #if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO)) - /* Stop the PWM generation timer */ - TCCR3B = 0; - #endif - - #if defined(AUDIO_OUT_MONO) - /* Set speaker as input to reduce current draw */ - DDRC &= ~(1 << 6); - #elif defined(AUDIO_OUT_STEREO) - /* Set speakers as inputs to reduce current draw */ - DDRC &= ~((1 << 6) | (1 << 5)); - #elif defined(AUDIO_OUT_PORTC) - /* Set PORTC low */ - PORTC = 0x00; - #endif -} - -/** Event handler for the library USB Configuration Changed event. */ -void EVENT_USB_Device_ConfigurationChanged(void) -{ - bool ConfigSuccess = true; - - ConfigSuccess &= Audio_Device_ConfigureEndpoints(&Speaker_Audio_Interface); - - LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR); -} - -/** Event handler for the library USB Control Request reception event. */ -void EVENT_USB_Device_ControlRequest(void) -{ - Audio_Device_ProcessControlRequest(&Speaker_Audio_Interface); -} - -/** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented - * in the user application to handle property manipulations on streaming audio endpoints. - * - * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for - * the given endpoint index, and should return as fast as possible. When non-NULL, this value may be altered for GET operations - * to indicate the size of the retrieved data. - * - * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value - * of the \c DataLength parameter. - * - * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - * \param[in] EndpointProperty Property of the endpoint to get or set, a value from Audio_ClassRequests_t. - * \param[in] EndpointAddress Address of the streaming endpoint whose property is being referenced. - * \param[in] EndpointControl Parameter of the endpoint to get or set, a value from Audio_EndpointControls_t. - * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum - * length of the retrieved data. When NULL, the function should return whether the given property - * and parameter is valid for the requested endpoint without reading or modifying the Data buffer. - * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where - * the retrieved data is to be stored for GET operations. - * - * \return Boolean \c true if the property get/set was successful, \c false otherwise - */ -bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, - const uint8_t EndpointProperty, - const uint8_t EndpointAddress, - const uint8_t EndpointControl, - uint16_t* const DataLength, - uint8_t* Data) -{ - /* Check the requested endpoint to see if a supported endpoint is being manipulated */ - if (EndpointAddress == Speaker_Audio_Interface.Config.DataOUTEndpoint.Address) - { - /* Check the requested control to see if a supported control is being manipulated */ - if (EndpointControl == AUDIO_EPCONTROL_SamplingFreq) - { - switch (EndpointProperty) - { - case AUDIO_REQ_SetCurrent: - /* Check if we are just testing for a valid property, or actually adjusting it */ - if (DataLength != NULL) - { - /* Set the new sampling frequency to the value given by the host */ - CurrentAudioSampleFrequency = (((uint32_t)Data[2] << 16) | ((uint32_t)Data[1] << 8) | (uint32_t)Data[0]); - - /* Adjust sample reload timer to the new frequency */ - OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1); - } - - return true; - case AUDIO_REQ_GetCurrent: - /* Check if we are just testing for a valid property, or actually reading it */ - if (DataLength != NULL) - { - *DataLength = 3; - - Data[2] = (CurrentAudioSampleFrequency >> 16); - Data[1] = (CurrentAudioSampleFrequency >> 8); - Data[0] = (CurrentAudioSampleFrequency & 0xFF); - } - - return true; - } - } - } - - return false; -} - -/** Audio class driver callback for the setting and retrieval of streaming interface properties. This callback must be implemented - * in the user application to handle property manipulations on streaming audio interfaces. - * - * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for - * the given entity and should return as fast as possible. When non-NULL, this value may be altered for GET operations - * to indicate the size of the retrieved data. - * - * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value - * of the \c DataLength parameter. - * - * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - * \param[in] Property Property of the interface to get or set, a value from Audio_ClassRequests_t. - * \param[in] EntityAddress Address of the audio entity whose property is being referenced. - * \param[in] Parameter Parameter of the entity to get or set, specific to each type of entity (see USB Audio specification). - * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum - * length of the retrieved data. When NULL, the function should return whether the given property - * and parameter is valid for the requested endpoint without reading or modifying the Data buffer. - * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where - * the retrieved data is to be stored for GET operations. - * - * \return Boolean \c true if the property GET/SET was successful, \c false otherwise - */ -bool CALLBACK_Audio_Device_GetSetInterfaceProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, - const uint8_t Property, - const uint8_t EntityAddress, - const uint16_t Parameter, - uint16_t* const DataLength, - uint8_t* Data) -{ - /* No audio interface entities in the device descriptor, thus no properties to get or set. */ - return false; -} |