Demos/Device/LowLevel/AudioOutput/AudioOutput.txt

   1 /** \file
   2  *
   3  *  This file contains special DoxyGen information for the generation of the main page and other special
   4  *  documentation pages. It is not a project source file.
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   6
   7 /** \mainpage Audio Output Device Demo
   8  *
   9  *  \section SSec_Info USB Information:
  10  *
  11  *  The following table gives a rundown of the USB utilization of this demo.
  12  *
  13  *  <table>
  14  *   <tr>
  15  *    <td><b>USB Mode:</b></td>
  16  *    <td>Device</td>
  17  *   </tr>
  18  *   <tr>
  19  *    <td><b>USB Class:</b></td>
  20  *    <td>Audio Class</td>
  21  *   </tr>
  22  *   <tr>
  23  *    <td><b>USB Subclass:</b></td>
  24  *    <td>Standard Audio Device</td>
  25  *   </tr>
  26  *   <tr>
  27  *    <td><b>Relevant Standards:</b></td>
  28  *    <td>USBIF Audio Class Specification</td>
  29  *    <td>USBIF Audio Class Terminal Types Specification</td>
  30  *    <td>USBIF Audio Data Formats Specification</td>
  31  *   </tr>
  32  *   <tr>
  33  *    <td><b>Usable Speeds:</b></td>
  34  *    <td>Full Speed Mode</td>
  35  *   </tr>
  36  *  </table>
  37  *
  38  *  \section SSec_Description Project Description:
  39  *
  40  *  Audio demonstration application. This gives a simple reference
  41  *  application for implementing a USB Audio Output device using the
  42  *  basic USB Audio drivers in all modern OSes (i.e. no special drivers
  43  *  required).
  44  *
  45  *  On start-up the system will automatically enumerate and function
  46  *  as a USB speaker. Incoming audio will output in 8-bit PWM onto
  47  *  the timer output (timer 3 for the AT90USBXXX6/7 USB AVRs, timer 1 for
  48  *  the AT90USBXXX2 controller AVRs) compare channel A for AUDIO_OUT_MONO
  49  *  mode, on channels A and B for AUDIO_OUT_STEREO and on the board LEDs
  50  *  for AUDIO_OUT_LEDS mode. Decouple audio outputs with a capacitor and
  51  *  attach to a speaker to hear the audio.
  52  *
  53  *  Under Windows, if a driver request dialogue pops up, select the option
  54  *  to automatically install the appropriate drivers.
  55  *
  56  *  \section SSec_Options Project Options
  57  *
  58  *  The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
  59  *
  60  *  <table>
  61  *   <tr>
  62  *    <td><b>Define Name:</b></td>
  63  *    <td><b>Location:</b></td>
  64  *    <td><b>Description:</b></td>
  65  *   </tr>
  66  *   <tr>
  67  *    <td>AUDIO_OUT_STEREO</td>
  68  *    <td>Makefile CDEFS</td>
  69  *    <td>When defined, this outputs the audio samples in stereo to the timer output pins of the microcontroller.</td>
  70  *   </tr>
  71  *   <tr>
  72  *    <td>AUDIO_OUT_MONO</td>
  73  *    <td>Makefile CDEFS</td>
  74  *    <td>When defined, this outputs the audio samples in mono to the timer output pin of the microcontroller.</td>
  75  *   </tr>
  76  *   <tr>
  77  *    <td>AUDIO_OUT_LEDS</td>
  78  *    <td>Makefile CDEFS</td>
  79  *    <td>When defined, this outputs the audio samples in stereo to the board LEDs.</td>
  80  *   </tr>
  81  *   <tr>
  82  *    <td>AUDIO_OUT_PORTC</td>
  83  *    <td>Makefile CDEFS</td>
  84  *    <td>When defined, this outputs the audio samples in mono to port C of the microcontroller, for connection to an
  85  *        external DAC.</td>
  86  *   </tr>
  87  *   <tr>
  88  *    <td>AUDIO_SAMPLE_FREQUENCY</td>
  89  *    <td>Descriptors.h</td>
  90  *    <td>Gives the audio sample rate per channel for the audio stream, in Hz.</td>
  91  *   </tr>
  92  *  </table>
  93  */