X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/6a7c298c0f7119e44e18de15d714cd8b938e3bef..b9b03aadb219d06fbad9d110e508db93e45461af:/Demos/Device/AudioOutput/AudioOutput.c diff --git a/Demos/Device/AudioOutput/AudioOutput.c b/Demos/Device/AudioOutput/AudioOutput.c deleted file mode 100644 index 8c3bf6188..000000000 --- a/Demos/Device/AudioOutput/AudioOutput.c +++ /dev/null @@ -1,206 +0,0 @@ -/* - LUFA Library - Copyright (C) Dean Camera, 2009. - - dean [at] fourwalledcubicle [dot] com - www.fourwalledcubicle.com -*/ - -/* - Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com) - - Permission to use, copy, modify, and distribute this software - and its documentation for any purpose and without fee is hereby - granted, 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 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_t Speaker_Audio_Interface = - { - .StreamingInterfaceNumber = 1, - - .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM, - .DataOUTEndpointSize = 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); - - for (;;) - { - if (Speaker_Audio_Interface.InterfaceEnabled) - ProcessNextSample(); - - USB_Audio_USBTask(&Speaker_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(); -} - -/** 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) -{ - if ((TIFR0 & (1 << OCF0A)) && USB_Audio_IsSampleReceived(&Speaker_Audio_Interface)) - { - /* Clear the sample reload timer */ - TIFR0 |= (1 << OCF0A); - - /* Retrieve the signed 16-bit left and right audio samples */ - int16_t LeftSample_16Bit = (int16_t)USB_Audio_ReadSample16(); - int16_t RightSample_16Bit = (int16_t)USB_Audio_ReadSample16(); - - /* Massage signed 16-bit left and right audio samples into signed 8-bit */ - int8_t LeftSample_8Bit = (LeftSample_16Bit >> 8); - int8_t RightSample_8Bit = (RightSample_16Bit >> 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 */ - OCRxA = ((uint8_t)MixedSample_8Bit ^ (1 << 7)); -#elif defined(AUDIO_OUT_STEREO) - /* Load the dual 8-bit samples into the PWM timer channels */ - OCRxA = ((uint8_t)LeftSample_8Bit ^ (1 << 7)); - OCRxB = ((uint8_t)RightSample_8Bit ^ (1 << 7)); -#elif defined(AUDIO_OUT_PORTC) - PORTC = MixedSample_8Bit; -#else - uint8_t LEDMask = LEDS_NO_LEDS; - - /* Make mixed sample value positive (absolute) */ - if (MixedSample_8Bit < 0) - MixedSample_8Bit = -MixedSample_8Bit; - - if (MixedSample_8Bit > ((128 / 8) * 1)) - LEDMask |= LEDS_LED1; - - if (MixedSample_8Bit > ((128 / 8) * 2)) - LEDMask |= LEDS_LED2; - - if (MixedSample_8Bit > ((128 / 8) * 3)) - LEDMask |= LEDS_LED3; - - if (MixedSample_8Bit > ((128 / 8) * 4)) - LEDMask |= LEDS_LED4; - - LEDs_SetAllLEDs(LEDMask); -#endif - } -} - -/** Event handler for the library USB Connection event. */ -void EVENT_USB_Connect(void) -{ - LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); - - /* Sample reload timer initialization */ - OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1; - TCCR0A = (1 << WGM01); // CTC mode - TCCR0B = (1 << CS00); // Fcpu 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 */ - TCCRxA = ((1 << WGMx0) | (1 << COMxA1) | (1 << COMxA0) - | (1 << COMxB1) | (1 << COMxB0)); // Set on match, clear on TOP - TCCRxB = ((1 << WGMx2) | (1 << CSx0)); // Fast 8-Bit PWM, Fcpu speed -#endif -} - -/** Event handler for the library USB Disconnection event. */ -void EVENT_USB_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 */ - TCCRxB = 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_ConfigurationChanged(void) -{ - LEDs_SetAllLEDs(LEDMASK_USB_READY); - - if (!(USB_Audio_ConfigureEndpoints(&Speaker_Audio_Interface))) - LEDs_SetAllLEDs(LEDMASK_USB_ERROR); -} - -/** Event handler for the library USB Unhandled Control Packet event. */ -void EVENT_USB_UnhandledControlPacket(void) -{ - USB_Audio_ProcessControlPacket(&Speaker_Audio_Interface); -}