312 lines
12 KiB
C
312 lines
12 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 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 disclaims 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 AudioOutput demo. This file contains the main tasks of
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* the demo and is responsible for the initial application hardware configuration.
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*/
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#include "AudioOutput.h"
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/** LUFA Audio Class driver interface configuration and state information. This structure is
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* passed to all Audio Class driver functions, so that multiple instances of the same class
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* within a device can be differentiated from one another.
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*/
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USB_ClassInfo_Audio_Device_t Speaker_Audio_Interface =
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{
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.Config =
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{
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.ControlInterfaceNumber = INTERFACE_ID_AudioControl,
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.StreamingInterfaceNumber = INTERFACE_ID_AudioStream,
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.DataOUTEndpoint =
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{
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.Address = AUDIO_STREAM_EPADDR,
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.Size = AUDIO_STREAM_EPSIZE,
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.Banks = 2,
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},
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},
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};
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/** Current audio sampling frequency of the streaming audio endpoint. */
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static uint32_t CurrentAudioSampleFrequency = 48000;
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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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GlobalInterruptEnable();
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for (;;)
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{
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Audio_Device_USBTask(&Speaker_Audio_Interface);
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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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#if (ARCH == ARCH_AVR8)
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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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#endif
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/* Hardware Initialization */
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LEDs_Init();
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USB_Init();
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}
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/** ISR to handle the reloading of the PWM timer with the next sample. */
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ISR(TIMER0_COMPA_vect, ISR_BLOCK)
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{
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uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
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/* Check that the USB bus is ready for the next sample to read */
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if (Audio_Device_IsSampleReceived(&Speaker_Audio_Interface))
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{
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/* Retrieve the signed 16-bit left and right audio samples, convert to 8-bit */
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int8_t LeftSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
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int8_t RightSample_8Bit = (Audio_Device_ReadSample16(&Speaker_Audio_Interface) >> 8);
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/* Mix the two channels together to produce a mono, 8-bit sample */
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int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);
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#if defined(AUDIO_OUT_MONO)
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/* Load the sample into the PWM timer channel */
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OCR3A = (MixedSample_8Bit ^ (1 << 7));
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#elif defined(AUDIO_OUT_STEREO)
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/* Load the dual 8-bit samples into the PWM timer channels */
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OCR3A = (LeftSample_8Bit ^ (1 << 7));
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OCR3B = (RightSample_8Bit ^ (1 << 7));
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#elif defined(AUDIO_OUT_PORTC)
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/* Load the 8-bit mixed sample into PORTC */
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PORTC = MixedSample_8Bit;
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#endif
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uint8_t LEDMask = LEDS_NO_LEDS;
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/* Turn on LEDs as the sample amplitude increases */
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if (MixedSample_8Bit > 16)
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LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);
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else if (MixedSample_8Bit > 8)
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LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);
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else if (MixedSample_8Bit > 4)
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LEDMask = (LEDS_LED1 | LEDS_LED2);
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else if (MixedSample_8Bit > 2)
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LEDMask = (LEDS_LED1);
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LEDs_SetAllLEDs(LEDMask);
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}
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Endpoint_SelectEndpoint(PrevEndpoint);
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}
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/** Event handler for the library USB Connection event. */
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void EVENT_USB_Device_Connect(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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/* Sample reload timer initialization */
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TIMSK0 = (1 << OCIE0A);
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OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
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TCCR0A = (1 << WGM01); // CTC mode
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TCCR0B = (1 << CS01); // Fcpu/8 speed
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#if defined(AUDIO_OUT_MONO)
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/* Set speaker as output */
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DDRC |= (1 << 6);
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#elif defined(AUDIO_OUT_STEREO)
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/* Set speakers as outputs */
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DDRC |= ((1 << 6) | (1 << 5));
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#elif defined(AUDIO_OUT_PORTC)
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/* Set PORTC as outputs */
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DDRC |= 0xFF;
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#endif
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#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
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/* PWM speaker timer initialization */
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TCCR3A = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)
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| (1 << COM3B1) | (1 << COM3B0)); // Set on match, clear on TOP
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TCCR3B = ((1 << WGM32) | (1 << CS30)); // Fast 8-Bit PWM, F_CPU speed
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#endif
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}
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/** Event handler for the library USB Disconnection event. */
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void EVENT_USB_Device_Disconnect(void)
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{
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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/* Stop the sample reload timer */
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TCCR0B = 0;
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#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))
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/* Stop the PWM generation timer */
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TCCR3B = 0;
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#endif
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#if defined(AUDIO_OUT_MONO)
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/* Set speaker as input to reduce current draw */
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DDRC &= ~(1 << 6);
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#elif defined(AUDIO_OUT_STEREO)
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/* Set speakers as inputs to reduce current draw */
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DDRC &= ~((1 << 6) | (1 << 5));
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#elif defined(AUDIO_OUT_PORTC)
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/* Set PORTC low */
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PORTC = 0x00;
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#endif
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}
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/** Event handler for the library USB Configuration Changed event. */
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void EVENT_USB_Device_ConfigurationChanged(void)
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{
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bool ConfigSuccess = true;
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ConfigSuccess &= Audio_Device_ConfigureEndpoints(&Speaker_Audio_Interface);
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LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
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}
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/** Event handler for the library USB Control Request reception event. */
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void EVENT_USB_Device_ControlRequest(void)
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{
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Audio_Device_ProcessControlRequest(&Speaker_Audio_Interface);
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}
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/** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented
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* in the user application to handle property manipulations on streaming audio endpoints.
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*
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* When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
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* the given endpoint index, and should return as fast as possible. When non-NULL, this value may be altered for GET operations
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* to indicate the size of the retrieved data.
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*
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* \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
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* of the \c DataLength parameter.
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*
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* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
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* \param[in] EndpointProperty Property of the endpoint to get or set, a value from Audio_ClassRequests_t.
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* \param[in] EndpointAddress Address of the streaming endpoint whose property is being referenced.
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* \param[in] EndpointControl Parameter of the endpoint to get or set, a value from Audio_EndpointControls_t.
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* \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
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* length of the retrieved data. When NULL, the function should return whether the given property
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* and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
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* \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
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* the retrieved data is to be stored for GET operations.
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*
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* \return Boolean \c true if the property get/set was successful, \c false otherwise
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*/
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bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
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const uint8_t EndpointProperty,
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const uint8_t EndpointAddress,
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const uint8_t EndpointControl,
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uint16_t* const DataLength,
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uint8_t* Data)
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{
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/* Check the requested endpoint to see if a supported endpoint is being manipulated */
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if (EndpointAddress == Speaker_Audio_Interface.Config.DataOUTEndpoint.Address)
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{
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/* Check the requested control to see if a supported control is being manipulated */
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if (EndpointControl == AUDIO_EPCONTROL_SamplingFreq)
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{
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switch (EndpointProperty)
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{
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case AUDIO_REQ_SetCurrent:
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/* Check if we are just testing for a valid property, or actually adjusting it */
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if (DataLength != NULL)
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{
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/* Set the new sampling frequency to the value given by the host */
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CurrentAudioSampleFrequency = (((uint32_t)Data[2] << 16) | ((uint32_t)Data[1] << 8) | (uint32_t)Data[0]);
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/* Adjust sample reload timer to the new frequency */
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OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
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}
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return true;
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case AUDIO_REQ_GetCurrent:
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/* Check if we are just testing for a valid property, or actually reading it */
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if (DataLength != NULL)
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{
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*DataLength = 3;
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Data[2] = (CurrentAudioSampleFrequency >> 16);
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Data[1] = (CurrentAudioSampleFrequency >> 8);
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Data[0] = (CurrentAudioSampleFrequency & 0xFF);
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}
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return true;
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}
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}
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}
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return false;
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}
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/** Audio class driver callback for the setting and retrieval of streaming interface properties. This callback must be implemented
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* in the user application to handle property manipulations on streaming audio interfaces.
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*
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* When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
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* the given entity and should return as fast as possible. When non-NULL, this value may be altered for GET operations
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* to indicate the size of the retrieved data.
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*
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* \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
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* of the \c DataLength parameter.
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*
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* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
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* \param[in] Property Property of the interface to get or set, a value from Audio_ClassRequests_t.
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* \param[in] EntityAddress Address of the audio entity whose property is being referenced.
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* \param[in] Parameter Parameter of the entity to get or set, specific to each type of entity (see USB Audio specification).
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* \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
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* length of the retrieved data. When NULL, the function should return whether the given property
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* and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
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* \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
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* the retrieved data is to be stored for GET operations.
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*
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* \return Boolean \c true if the property GET/SET was successful, \c false otherwise
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*/
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bool CALLBACK_Audio_Device_GetSetInterfaceProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
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const uint8_t Property,
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const uint8_t EntityAddress,
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const uint16_t Parameter,
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uint16_t* const DataLength,
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uint8_t* Data)
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{
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/* No audio interface entities in the device descriptor, thus no properties to get or set. */
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return false;
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}
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