Copy the following application source files into the folder containing the project's source files:
app_thumb_drive_audio_task.c,
app_thumb_drive_audio_task.h,
app_display_task.c,
app_display_task.h,
decoder.c, and
decoder.h.
Copy them from this folder:
apps/training/middleware/thumb_drive_player/thumb_drive_player_lab/dev_files
to this one:
apps/training/middleware/dev/thumb_drive_player/thumb_drive_player_lab/firmware/src

Add app_thumb_drive_audio_task.c, app_display_task.c, and decoder.c to the Source Files/app folder (in the MPLAB X IDE Projects pane) by right-clicking and selecting Add Existing Item…

Add app_thumb_drive_audio_task.h, app_display_task.h, and decoder.h to the Header Files/app folder by right-clicking and selecting Add Existing Item…

The files under the project should look like this:

Harmony version 1.08 provides audio decoder libraries in one of the many demo applications that are included in the Harmony download. They can be found here:
<HarmonyInstallPath>/apps/audio/universal_audio_decoders/firmware/src/audio_decoder.
Note: Harmony version 1.09 will move these libraries under the …/framework/decoder folder. If you are using a newer version, you can skip this step.

Your project needs to use the WAV decoder found in the universal_audio_decoders demo application. Let the compiler know where it can find these source files.

To include this path, right-click on thumb_drive_player_lab in the Projects pane and select Properties. In the Categories pane, select:
Conf: [pic32mz_ef_sk_meb2] > XC32 (Global Options) > xc32-gcc.

In the Option categories dropdown menu, select Preprocessing and messages.

Click on Include directories.

Browse to this path:
<HarmonyInstallPath>/apps/audio/universal_audio_decoders/firmware/src/audio_decoder.
Click OK.

Open app.c (double-click on the file name in the Projects pane) and add the following code to the APP_Initialize function. This code initializes the APP_THUMB_DRIVE_AUDIO and APP_DISPLAY tasks.

Open the app.h file and include this file:
app_thumb_drive_audio_task.h.
The decoder file wav.c depends on definitions present in other files and expects app.h to include those files.

Open system_config.h and include the following application specific definitions:

Save all files before closing.

You are now ready to build the code! Click the Clean and Build icon and verify that the project builds successfully.