From b9b03aadb219d06fbad9d110e508db93e45461af Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Fri, 5 Jun 2009 07:16:33 +0000 Subject: Move new Class Driver powered demos to a new ClassDriver subdirectory, re-add old low level demos to a LowLevel subdirectory. --- Demos/Device/ClassDriver/AudioOutput/AudioOutput.c | 206 +++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 Demos/Device/ClassDriver/AudioOutput/AudioOutput.c (limited to 'Demos/Device/ClassDriver/AudioOutput/AudioOutput.c') diff --git a/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c b/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c new file mode 100644 index 000000000..8c3bf6188 --- /dev/null +++ b/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c @@ -0,0 +1,206 @@ +/* + 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); +} -- cgit v1.2.3