+++ /dev/null
-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, and distribute this software\r
- and its documentation for any purpose and without fee is hereby\r
- granted, provided that the above copyright notice appear in all\r
- copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting\r
- documentation, and that the name of the author not be used in\r
- advertising or publicity pertaining to distribution of the\r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-/** \file\r
- *\r
- * Main source file for the AudioOutput demo. This file contains the main tasks of\r
- * the demo and is responsible for the initial application hardware configuration.\r
- */\r
-\r
-#include "AudioOutput.h"\r
-\r
-/** LUFA Audio Class driver interface configuration and state information. This structure is\r
- * passed to all Audio Class driver functions, so that multiple instances of the same class\r
- * within a device can be differentiated from one another.\r
- */\r
-USB_ClassInfo_Audio_t Speaker_Audio_Interface =\r
- {\r
- .StreamingInterfaceNumber = 1,\r
-\r
- .DataOUTEndpointNumber = AUDIO_STREAM_EPNUM,\r
- .DataOUTEndpointSize = AUDIO_STREAM_EPSIZE,\r
- };\r
-\r
-/** Main program entry point. This routine contains the overall program flow, including initial\r
- * setup of all components and the main program loop.\r
- */\r
-int main(void)\r
-{\r
- SetupHardware();\r
-\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
- \r
- for (;;)\r
- {\r
- if (Speaker_Audio_Interface.InterfaceEnabled)\r
- ProcessNextSample();\r
-\r
- USB_Audio_USBTask(&Speaker_Audio_Interface);\r
- USB_USBTask();\r
- }\r
-}\r
-\r
-/** Configures the board hardware and chip peripherals for the demo's functionality. */\r
-void SetupHardware(void)\r
-{\r
- /* Disable watchdog if enabled by bootloader/fuses */\r
- MCUSR &= ~(1 << WDRF);\r
- wdt_disable();\r
-\r
- /* Disable clock division */\r
- clock_prescale_set(clock_div_1);\r
-\r
- /* Hardware Initialization */\r
- LEDs_Init();\r
- USB_Init();\r
-}\r
-\r
-/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio\r
- * interface, each time the sample reload timer period elapses to give a constant sample rate.\r
- */\r
-void ProcessNextSample(void)\r
-{\r
- if ((TIFR0 & (1 << OCF0A)) && USB_Audio_IsSampleReceived(&Speaker_Audio_Interface))\r
- {\r
- /* Clear the sample reload timer */\r
- TIFR0 |= (1 << OCF0A);\r
-\r
- /* Retrieve the signed 16-bit left and right audio samples */\r
- int16_t LeftSample_16Bit = (int16_t)USB_Audio_ReadSample16();\r
- int16_t RightSample_16Bit = (int16_t)USB_Audio_ReadSample16();\r
-\r
- /* Massage signed 16-bit left and right audio samples into signed 8-bit */\r
- int8_t LeftSample_8Bit = (LeftSample_16Bit >> 8);\r
- int8_t RightSample_8Bit = (RightSample_16Bit >> 8);\r
- \r
- /* Mix the two channels together to produce a mono, 8-bit sample */\r
- int8_t MixedSample_8Bit = (((int16_t)LeftSample_8Bit + (int16_t)RightSample_8Bit) >> 1);\r
-\r
-#if defined(AUDIO_OUT_MONO)\r
- /* Load the sample into the PWM timer channel */\r
- OCRxA = ((uint8_t)MixedSample_8Bit ^ (1 << 7));\r
-#elif defined(AUDIO_OUT_STEREO)\r
- /* Load the dual 8-bit samples into the PWM timer channels */\r
- OCRxA = ((uint8_t)LeftSample_8Bit ^ (1 << 7));\r
- OCRxB = ((uint8_t)RightSample_8Bit ^ (1 << 7));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- PORTC = MixedSample_8Bit;\r
-#else\r
- uint8_t LEDMask = LEDS_NO_LEDS;\r
-\r
- /* Make mixed sample value positive (absolute) */\r
- if (MixedSample_8Bit < 0)\r
- MixedSample_8Bit = -MixedSample_8Bit;\r
-\r
- if (MixedSample_8Bit > ((128 / 8) * 1))\r
- LEDMask |= LEDS_LED1;\r
- \r
- if (MixedSample_8Bit > ((128 / 8) * 2))\r
- LEDMask |= LEDS_LED2;\r
- \r
- if (MixedSample_8Bit > ((128 / 8) * 3))\r
- LEDMask |= LEDS_LED3;\r
-\r
- if (MixedSample_8Bit > ((128 / 8) * 4))\r
- LEDMask |= LEDS_LED4;\r
-\r
- LEDs_SetAllLEDs(LEDMask);\r
-#endif\r
- }\r
-}\r
-\r
-/** Event handler for the library USB Connection event. */\r
-void EVENT_USB_Connect(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);\r
- \r
- /* Sample reload timer initialization */\r
- OCR0A = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;\r
- TCCR0A = (1 << WGM01); // CTC mode\r
- TCCR0B = (1 << CS00); // Fcpu speed\r
-\r
-#if defined(AUDIO_OUT_MONO)\r
- /* Set speaker as output */\r
- DDRC |= (1 << 6);\r
-#elif defined(AUDIO_OUT_STEREO)\r
- /* Set speakers as outputs */\r
- DDRC |= ((1 << 6) | (1 << 5));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- /* Set PORTC as outputs */\r
- DDRC |= 0xFF;\r
-#endif\r
-\r
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))\r
- /* PWM speaker timer initialization */\r
- TCCRxA = ((1 << WGMx0) | (1 << COMxA1) | (1 << COMxA0)\r
- | (1 << COMxB1) | (1 << COMxB0)); // Set on match, clear on TOP\r
- TCCRxB = ((1 << WGMx2) | (1 << CSx0)); // Fast 8-Bit PWM, Fcpu speed\r
-#endif \r
-}\r
-\r
-/** Event handler for the library USB Disconnection event. */\r
-void EVENT_USB_Disconnect(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);\r
-\r
- /* Stop the sample reload timer */\r
- TCCR0B = 0;\r
-\r
-#if (defined(AUDIO_OUT_MONO) || defined(AUDIO_OUT_STEREO))\r
- /* Stop the PWM generation timer */\r
- TCCRxB = 0;\r
-#endif \r
-\r
-#if defined(AUDIO_OUT_MONO)\r
- /* Set speaker as input to reduce current draw */\r
- DDRC &= ~(1 << 6);\r
-#elif defined(AUDIO_OUT_STEREO)\r
- /* Set speakers as inputs to reduce current draw */\r
- DDRC &= ~((1 << 6) | (1 << 5));\r
-#elif defined(AUDIO_OUT_PORTC)\r
- /* Set PORTC low */\r
- PORTC = 0x00;\r
-#endif\r
-}\r
-\r
-/** Event handler for the library USB Configuration Changed event. */\r
-void EVENT_USB_ConfigurationChanged(void)\r
-{\r
- LEDs_SetAllLEDs(LEDMASK_USB_READY);\r
- \r
- if (!(USB_Audio_ConfigureEndpoints(&Speaker_Audio_Interface)))\r
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);\r
-}\r
-\r
-/** Event handler for the library USB Unhandled Control Packet event. */\r
-void EVENT_USB_UnhandledControlPacket(void)\r
-{\r
- USB_Audio_ProcessControlPacket(&Speaker_Audio_Interface);\r
-}\r
projects / pub / lufa.git / blobdiff