Zybo DMA Audio Demo

The audio demo records a 5 second sample from microphone(J6) or line in (J7) and plays it back on a headphone out(J5). Recording and playback are started by push buttons.

• Basic familiarity with Vivado
  • This experience can be found by walking through our “Getting Started with Vivado” guide

• Zybo Zynq board
• Micro-USB cable
• Headphones or Speakers
• Audio Input device (Aux-In, Guitar, etc.)

• Vivado Design Suite 2016.4
• Digilent Board Support Files for Vivado
  • Follow the Vivado Board Files for Digilent 7-Series FPGA Boards guide on how to install Board Support Files for Vivado.

Zybo DMA Audio Project Repository – ZIP Archive GIT Repo

1) Follow the Using Digilent Github Demo Projects Tutorial. Since this is a Vivado SDK Project, you can either directly launch SDK and import the hardware handoff, or you can generate a bitstream in Vivado before launching SDK. Select the hardware handoff options in the tutorial if you don't want to modify the project block design later. Return to this guide when prompted to check for additional hardware requirements and setup.

2) In order to use the demo, you will need to plug in your microphone or aux input into the respective jack on your Zybo. Plug your speakers/headphones into the Line out jack.

3) Turn on your board and open a serial terminal (such as TeraTerm) on your computer to receive status messages. Setup the serial port to connect to the appropriate port for your board, with a baud rate of 115200. Then return to the Github Project Tutorial to finish programming and running the demo.

Tip

You can connect your serial terminal to your board before the board is programmed, this will make sure that you don't miss any startup messages. If the demo is already running, you can restart the demo in SDK to make sure you get these messages.

Audio playback and recording are controlled by push buttons as below.

To record from the microphone input, press BTN1. To record from the line input, press BTN3. Once the recording is activated, the message “Start Recording…” will be sent over UART and the demo will record 5 seconds of audio. If any buttons are pressed during the recording, the message “Still Recording…” will be sent over UART.

To play to the headphone output, press BTN2. Once the playback is activated, the message “Start Playback…” will be sent over UART and the demo will play 5 seconds of audio. If any buttons are pressed during the playback, the message “Still Playing…” will be sent over UART.