1. set up related build toolchain
   Before you build the case, you should set up related build toolchain firstly,
   you can see the DSP User's Guide to know how to install these toolchians.
   This document is placed in the following location:
   https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX

2. Build the DSP framework

  1). build all
      make all

  2). only build DSP framework
      make DSP_FRAMEWORK

  3). only build DSP wrapper lib
      make DSP_WRAPPER

  4). only build DSP unit test
      make UNIT_TEST

  5). clean the folder
      make clean

3. Get the executed file and lib file
   All the output files are placed in release folder.