Zybo Z7-20 DMA Audio Demo

Introduction

This project demonstrates a way to use the Audio Codec, DDR memory, and 3.5mm Audio Jacks included on the Zybo Z7-20 in order to record and play audio. Three of the four user push buttons can be used to record a 5 second snippet of audio from the microphone input (MIC IN) and line input (LINE IN) jacks, or to play a recorded snippet back out over the headphone output (HPH OUT) jack. The USB-UART bridge attached to the microUSB port is used to display status messages. The table below shows the functions mapped to each of the push buttons.

Button	Function
BTN0	N/A
BTN1	Record from MIC IN
BTN2	Play on HPH OUT
BTN3	Record from LINE IN

Using This Demo

Requirements:

• Zybo Z7-20
• Vivado+SDK 2018.2 Installation
• Tera Term Installation or other serial terminal application
• Audio Input Source (with 3.5mm plug)
• Audio Output Source (with 3.5mm plug)
• MicroUSB Cable

Release Usage:

1. Download and extract the most recent "Zybo-Z7-20-DMA-<version>.zip" archive from this repository's releases page.

2. Open project in Vivado 2018.2 (<archive extracted location>/vivado_proj/Zybo-Z7-20-DMA.xpr).

3. In the toolbar at the top of the Vivado window, select File -> Export -> Export Hardware.

4. Set "Export to" field to "<Local to Project>" and check "Include bitstream" box then click "OK".

5. In the toolbar at the top of the Vivado window, select File -> Launch SDK.

6. Set "Exported location" and "Workspace" fields to "<Local to Project>" then click "OK".

7. With SDK opened, wait for the hardware platform to be imported.

8. In the toolbar at the top of the SDK window, select File -> New -> Application Project.

9. Fill out fields as in the table below. Most of the listed values will be the defaults, but are placed in the table for completeness.

Setting	Value
Project name	Zybo-Z7-20-DMA
Use default location	checked box
OS Platform	standalone
Target Hardware: Hardware Platform	system_wrapper_hw_platform_0
Target Hardware: Processor	ps7_cortexa9_0
Target Software: Language	C
Target Software: Board Support Package	Create New (Zybo-Z7-20-DMA_bsp)

10. Click "Next", then select "Empty Application" from the list of available templates. Then click "Finish".
11. Expand the new application project (named "Zybo-Z7-20-DMA") in the Project Explorer pane to the left of the SDK window.
12. Right click on the "src" subdirectory of the application project and select Import
13. In the "Select an import wizard" pane of the Import wizard, expand "General" and select "File System". Then click Next.
14. Fill out fields on the "File system" screen as in the table below. Most of the listed values will be the defaults, but are placed in the table for completeness.

Setting	Value
From directory	<archive extracted location>/sdk_appsrc
Files to import pane: sdk_appsrc	checked box
Into folder	Zybo-Z7-20-DMA/src
Options: Overwrite existing resources without warning	checked box
Options: Create top-level folder	unchecked box

15. Click Finish.

16. Set the Zybo Z7-20's programming mode jumper (JP5) to "JTAG" and its power input select jumper (JP6) to "USB".
17. Plug the Zybo Z7-20 into the computer running SDK using a microUSB cable connected to the Zybo Z7's PROG/UART port (J12).
18. Plug in audio inputs and outputs to the 3.5mm headphone output (HPH OUT), line input (LINE IN), and microphone input (MIC IN) audio jacks.
19. Open a serial terminal application (such as TeraTerm FIXME LINK) and connect it to the Zybo Z7's serial port, using a baud rate of 115200. (FIXME more details here?)
20. In the toolbar at the top of the SDK window, select Xilinx -> Program FPGA. Leave all fields as their defaults and click "Program".
21. Right click on the "Zybo-Z7-20-DMA" application project in the Project Explorer pane, and select "Run As -> Launch on Hardware (System Debugger)".
22. Refer to the statements printed via the serial terminal application for instructions on how to use the demo.

For more information on how this project is version controlled refer to the Digilent Vivado Scripts Repository