ENSC 452 - Group 15 - The Ultimate DJ Board

Overview

This is our group project for ENSC 452 - Advanced Digital System Design. We decided to do audio processing in the form of a DJ board.

IP Cores Used

• AXI-Stream FFT (512 point)
• AXI GPIO
• AXI DMA
• AXI Audio Controller
• AXI-Stream VGA Core (see acknowledgements)
• Beat Detector (Custom)
• Audio Mixer (Custom)

Features

• Play stored sounds (Airhorn and DJ Khaled's Another One)
• Equalizer effects for high, mid, and low frequencies.
• Echo effect.
• Record and playback Line In audio.
• Loopback recorded audio.

Requirements

• ZedBoard
• Vivado 2017.3
• Vivado 2017.3 Tcl Shell
• Xilinx SDK

Usage

Vivado

1. Open Vivado.
2. Run build.tcl. This will generate the block diagram.
3. Click Generate Bitstream. This will take a while, so grab yourself a coffee and get comfortable!
4. Export the hardware.
5. Launch the SDK with default settings.

Xilinx SDK

1. Import projects from ./sdk. Do not select the *_bsp and audioTest_wrapper_* projects.
2. Create a board support package (BSP) with the name audioTest_bsp and the following setting:
   Uncheck Use default location.
   Location: (browse to sdk folder)
   CPU: ps7_cortexa9_0.
3. Create a board support package (BSP) with the name vga_bsp and the following setting:
   Uncheck Use default location.
   Location: (browse to sdk folder)
   CPU: ps7_cortexa9_1.
4. Build the project.
5. Program the FPGA with the bitstream that you exported.

Set Up Debug Configurations

Make two debug configurations with the following names:

1. Run Me First!
   In the Target Setup tab:
   Debug Type: Standalone Application Debug.
   Uncheck Program FPGA.
   Check Run ps7_post_config.
   In the Application tab:
   Core 0: audioTest/audioTest.elf
   Core 1: (none)
2. Run Me Second!
   In the Target Setup tab:
   Debug Type: Standalone Application Debug.
   Uncheck Program FPGA.
   Check Run ps7_post_config.
   In the Application tab:
   Core 0: audioTest/audioTest.elf
   Core 1: vga/vga.elf

Run Project

1. Ensure that Skip All Breakpoints is deselected.
2. Debug Run Me First!, and click Continue when loaded.
3. Debug Run Me Second!. If a prompt pops up regarding Run Me First!, click Yes to terminate it and continue.

Load Files onto DDR3

1. Open the Vivado 2017.3 Tcl Shell.
2. In ./ddr, modify the TCL script to point to the absolute path of the ddr folder.
3. Copy and paste the script into the shell.
4. Verify that the shell has loaded all files onto the board.

Playing With The Board Features.

1. In the SDK, click Continue on core 0 (important!).
2. Click Continue on core 1.
3. Plug in your audio source into Line In.
4. Plug in your headphones/speakers into Headphone Out.
5. Go and have fun!

Load onto SD Card (Optional)

1. In the SDK, click File > New > Application Project.
2. Choose any name for your application project.
3. For the Hardware Platform, choose audioTest_wrapper_*, and click Next.
4. Select Zynq FSBL, and click Finish. This is your bootloader.
5. Build all projects.
6. Click Xilinx > Create Boot Image.
7. Specify an output path with the filename as BOOT.bin
8. Add the following files in order:
   • bootloader .elf with Partition Type bootloader.
   • bitstream .bit with Partition Type data.
   • audioTest .elf with Partition Type data.
   • anotherOne .bin with Partition Type data and with Load set to the address in luiMemoryLocations.h.
   • airhorn .bin with Partition Type data and with Load set to the address in luiMemoryLocations.h.
9. Click Create Image.
10. Copy BOOT.bin to the root of a FAT32 formatted SD card, and insert it into the ZedBoard.
11. Set the boot mode of the ZedBoard to SD Card by shorting jumpers MIO4 and MIO5.
12. Turn it on, and have fun!

Button Mappings

Equalizer:

• Switch 0: Adjust low frequencies (Down - off, Up - on)
• Switch 1: Adjust mid frequencies (Down - off, Up - on)
• Switch 2: Adjust high frequencies (Down - off, Up - on)

Pitch and Echo:

• Switch 3: Enable pitch adjustment with push buttons (not working) (Down - off, Up - on)
• Switch 4: Enable echo adjustment with push buttons (Down - off, Up - on).
• PL Push Button Up: Amplify the enabled effects from switch 3 and 4.
• PL Push Button Centre: Reset the enabled effects from switch 3 and 4 to their default (off) values.
• PL Push Button Down: Lower the enabled effects from switch 3 and 4.

Recorded and Stored Sounds:

The following two push buttons depend on the settings on switches 7 to 5.

• PS Push Button Right: Playback sound to Headphone Out.
• PS Push Button Left: Record sound from Line In.

Setting	Switch 7	Switch 6	Switch 5
Use/record recorded sound 1 (no loopback)	Down	Down	Down
Use/record recorded sound 1 (loopback)	Up	Down	Down
Use/record recorded sound 2 (no loopback)	Down	Up	Up
Use/record recorded sound 2 (loopback)	Up	Up	Up
Use stored sound 1 (Another One)	Down	Up	Down
Use stored sound 1 (Airhorn)	Down	Down	Up

Acknowledgements

• Kind thanks to our classmates Maggie Parkhurst and Steven Lippmann for lending us their VGA core.
• AXI-Lite Slave from Laxer3a
• Circular buffer for echo effect from EmbeddedArtistry