Zybo Z7 DMA Audio Demo

Overview

Description

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

Features Used

Not Used Used
4 slide switches X
5 LEDs X
2 RGB LEDs (1*) X
6 push buttons X
USB-UART Bridge X
Micro SD card connector X
HDMI Sink X
HDMI Source X
Pcam camera connector X
Audio codec w/ three 3.5mm jacks X
User EEPROM X
10/100/1000 Ethernet PHY X
1GB 1066MHz DDR3 Memory X
Serial Flash X
6 Pmod ports (5*) X
Pmod for differential analog signals X
USB HID Host X

*The -7010 variant has several differences that are shown in parenthesis above

Prerequisites

Skills

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

Hardware

  • Zybo Z7 Zynq board
  • Micro-USB cable
  • Headphones or Speakers
  • Audio Input device (Aux-In, Guitar, etc.)

Software

Downloads

Zybo Z7-10 DMA Audio Project Repository – ZIP Archive GIT Repo

Zybo Z7-20 DMA Audio Project Repository – ZIP Archive GIT Repo


Download and Launch the Zybo Z7 DMA Audio Demo

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 (MIC) or aux input into the respective jack on your Zybo. Plug your speakers/headphones into the headphone (HPH) 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.



Using the Zybo Z7 DMA Audio Demo

1. Controls

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

Button Function
BTN0 no effect
BTN1 record from mic in
BTN2 play on hph out
BTN3 record from line in

2. Recording from an input

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.

3. Playing to an output

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.