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SD Card Reader “.wav” Audio player on PIC32MZ Embedded Connectivity with FPU Starter Kit + Multimedia Expansion Board II

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Description

This application reads a WAV audio file from the SD card on the PIC32 Multimedia Expansion Board (MEB) II and streams it over the PIC32 I²S interface through the audio CODEC. The application implements the functionality of an audio player (for WAV files only). The application switches to the next track when the current track playing is completed (assuming that there is more than one track on the SD card).

Modules/Technology Used:

  • Peripheral Modules
    • I2C
    • I2S
    • Timer
    • Core Timer
  • Drivers
    • I2S Driver
    • I2C Driver
    • AK4953 Driver
    • SDCARD (SPI) Driver
    • USB High Speed Driver
    • MSD Function Driver
  • BSP Library
    • PIC32MZ EF Starter Kit BSP
  • Audio Decoder Libraries
    • WAV Decoder Library
  • System Services
    • File System
  • Middleware
    • USB device layer

Hardware Used:

Note: This application is a reference only to the existing users of Multimedia Expansion Board II (MEB II) to port/develop their application(s) using MPLAB Harmony v3 as the Multimedia Expansion Board II (MEB II) is now a matured product and the same is not available for purchase from Microchip Direct.

Software/Tools Used:

This project has been verified to work with the following versions of software tools:

Because Microchip regularly update tools, occasionally issue(s) could be discovered while using the newer versions of the tools. If the project doesn’t seem to work and version incompatibility is suspected, It is recommended to double-check and use the same versions that the project was tested with.

Setup:

  • Connect the PIC32MZ Embedded Connectivity with FPU (EF) Starter Kit to the Host PC as a USB Device through a Type-A male to micro-B USB cable connected to Micro-B USB (Debug USB) port.
  • Connect the wired stereo headphone to the audio jack

Note: It is not necessary to have an MPLAB Real ICE™ to program/debug the code. The PIC32MZ EF Starter Kit includes a PICkit™ on-board (PKOB) debugger. The PKOB debugger can be connected to a host PC through the USB Mini-B connector on the PIC32MZ EF Starter Kit for programming/debugging (see the red cable in the hardware setup).

Programming hex file:

The pre-built hex file can be programmed by following the below steps.

Steps to program the hex file

  • Open MPLAB X IDE
  • Close all existing projects in IDE, if any project is opened.
  • Go to File -> Import -> Hex/ELF File
  • In the “Import Image File” window, Step 1 - Create Prebuilt Project, Click the “Browse” button to select the prebuilt hex file.
  • Select Device has “PIC32MZ2048EFH144”
  • Ensure the proper tool is selected under “Hardware Tool”
  • Click on Next button
  • In the “Import Image File” window, Step 2 - Select Project Name and Folder, select appropriate project name and folder
  • Click on Finish button
  • In MPLAB X IDE, click on “Make and Program Device” Button. The device gets programmed in sometime
  • Follow the steps in “Running the Demo” section below

Programming/Debugging Application Project:

  • Open the project (audio_player_lab4/firmware/audio_player_lab4.X) in MPLAB X IDE
  • Ensure “PKOB” is selected as hardware tool to program/debug the application
  • Build the code and program the device by clicking on the “make and program” button in MPLAB X IDE tool bar
  • Follow the steps in “Running the Demo” section below

Running the Demo:

  • Go to the folder audio_player_lab4\firmware\sample_audio and copy a few sample WAV files to the micro SD card
  • Insert the micro SD card into the micro SD card slot (J8) on the MEB II
  • Connect a USB cable from the micro USB connector (J4) on the PIC32MZEF Starter Kit board to the PC
  • Connect a headphone to the HP Out connector on the MEB II and you should hear the audio track being played
  • You may load more WAV audio files by switching to the USB SD card reader mode (by pressing the switch S1 on the MEB II). After loading, switch back to the player mode and you should hear the newly added audio tracks to the SD card

Comments:

Revision:

  • v1.2.0 regenerated and tested the application
  • v1.1.0 regenerated and tested the application
  • v1.0.0 released demo application


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