实验现象：
串口输出：
Setting up time......................[OK]
Initializing audio codec.............[OK]
Creating shell task..................[OK]
Creating SD card task................[OK]

Audio driver demo application

Shell (build: Dec  5 2013)
Copyright (c) 2008 Freescale Semiconductor;
shell>
shell>
  SD card installed to "a:"
shell>help
Available commands:
   cd <directory>
   del <file>
   dir [<filespec>] [<attr>]]
   exit
   help [<command>]
   mkdir <directory>
   ren <oldname> <newname>
   rmdir <directory>
   play <device> <filename>
   record <device> <filename> <format>
   ?
shell> dir
A.WAV          441044 12-06-2013 11:35:56      A A.WAV
BB.WAV        4399198 12-06-2013 14:17:12      A BB.WAV
shell> play sai: a:/bb.wav
  Playback information
  Sampling frequency:     22050 Hz
  Bit depth:              16 bits
  Channels:               mono
  Data rate:              44 kbyte/s
  ----------------------------------------------
  Playing a file...DONE
  ----------------------------------------------
  Playback stats
  Total interrupts:              549934
  Bytes requested for transmit:  4399154
  Bytes transmitted:             4399154
  Underruns of hardware FIFO:    0
  Software buffer empty:         39
  ----------------------------------------------
shell>

该K70音频例程基于MQX操作系统,仅支持wav文件播放，文件放置于SD/TF卡中并插到K70EK上，更多信息请参考MQX例程。