TDS02 - Training Digital Signal Processing 02

© Harry Broeders - Hogeschool Rotterdam.

CC3200AUDBOOST CC3220S-LAUNCHXL This page is meant for student of the minor Embedded Systems at Rotterdam University or anyone who wants to experiment with digital signal processing using the CC3200AUDBOOST Audio BoosterPack from Texas Instruments (shown on the left) in combination with their CC3220S LaunchPad development board (shown on the right). This introduction describes how to install the proper software to experiment with these boards. The two most important components on these boards are the CC3220S SimpleLink™ Wi-Fi® Wireless Microcontroller Unit and the TLV320AIC3254 Codec (coder-decoder). The CC3220S System-on-Chip (SoC) is a single-chip with two separate execution environments: an user application dedicated ARM® Cortex®-M4 MCU and a network processor MCU. The TLV320AIC3254 is a 20-bit stereo audio codec with embedded miniDSP which can operate with a sample rate of up to 192 ksps (kilo samples per second) and is optimized for low-power operation. The audio quality is higher than CD quality which uses 16-bits with a sample rate of 44.1 ksps.

Obtain hard- and software

Students which follow the minor Embedded Systems at Rotterdam University may buy the boards shown above at the shop at EAS. To prevent damaging the boards by Electro Static Discharge (ESD) you have to observe the following precautions while handling the board:

There are four programs which we will use in combination with these boards:

You can choose to work on your own laptop or on a PC avaiable in the lab.

Install Tera Term, UniFlash and Soundcard Oscilloscope

Tera Term can be downloaded from

UniFlash can be downloaded from

Soundcard Oscilloscope can be downloaded from

The installation of these programs needs no further explanation.

Install MATLAB

You can find the instructions to install MATLAB on your own PC in the direcory \\artemis03\STUD02\Opleiding\Elektrotechniek\2019-2020\Minor Embedded Systems\TDS02\Software on the students network of Rotterdam University.

Install Code Composer Studio

CCS can be downloaded from

After accepting the license and choosing the install directory, you need to select the product families to install. You have to select SimpleLink™ Wi-Fi® CC32xx Wireless MCUs.

SimpleLink™ Wi-Fi® CC32xx Wireless MCUs

Press Next and then press Finish.

The installation of CCS9 needs no further explanation. This tutorial assumes that CCS9 is installed in its default directory C:\ti\ccsv9.

Run the out of the box application on the CC3220S LAUNCHXL board

The CC3220S LAUNCHXL board comes with an out of the box application installed in its flash memory. We start by running this application. Connect your board with the PC using an USB cable. Now start Tera Term.

Select Serial and select the XDS110 Class Application/User UART. This can be a different (virtual) COM port as shown below.

Tera Term

Choose Setup, Serial port... from the menu.

Adjust the Baud rate as shown below.

Tera Term baud rate settings

Now reset the CC3220S LAUNCHXL board by pressing the reset button which is located next to the USB connector.

If all goes well, the output shown below, will be displayed in Tera Term.

Out of the box application.

The out of the box application has started and some properties of the system are reported (e.g. the MAC address). The board is now waiting to be provisioned. In telecommunication, provisioning involves the process of preparing a network node to allow it to provide services to its users. The board supports two methods for provisioning AP + SC:

You can now use your smartphone to connect to connect to the access point named mysimplelink-XXXXXX, where XXXXX are the last 6 (hexadecimal) digits from your MAC address. When your smartphone is connected to this access point you can open the website which is embedded in the out of the box application running on the CC3220S LAUNCHXL board. Just type the IP address into the address bar of your favorite browser. You should be able to switch the red led on and off and to see the output of the accelerometer.

Out of the box web page

If you can see something similar to the figure above, you know that your board is working properly. It is now time to remove the out of the box application from the board's flash memory. Because otherwise we will have a lot of Wi-Fi access points in the lab which will interfere with the school's Wi-Fi network. You can always reinstall the out of the box application later.

Replace the out of the box application with a simple blinking led application

The code for the blinking led application is contained in a zip file which you can download here: images/ Download this file to your PC.

Open the UniFlash program and connect your CC3220S LAUNCHXL board to the PC. If all goes well UniFlash will recognize your board and you can press Start.

UniFlash start

Now click on Manage Projects.

UniFlash manage projects

Click on the Import Project from ZIP file icon and select the file that you have downloaded earlier.

UniFlash import project from zip file

Select the project knipper_groene_led and click on the Open Selected Project icon.

UniFlash open selected project

Now click the Connect button.

UniFlash connect

Click the Burn button.

UniFlash generate image

Finally, click on the Connect, Create and Program Image button.

UniFlash connect, create and program image

The blinking led application is now programmed into the flash memory on theCC3220S LAUNCHXL board. After programming this application will start and, if all went well, the green led will blink. Now every time you reset the board this blinking led application will run. No Wi-Fi access point will be created by the board anymore.


Install the SimpleLink CC32XX SDK (Software Development Kit) using CCS.

Open Code Composer Studio and choose View, Resource Explorer. Scroll down to find SimpleLink CC32XX SDK. Click on Download and install.

SimpleLink SDK install

Check the SimpleLink Academy option.

SimpleLink academy

Recompile the driverlib

To properly debug programs which use the driverlib (included in the SimpleLink SDK), the driverlib must be recompiled.

Choose Project, Import CCS projects... from the menu.

Click the Browse button and select the directory where the latest version of the simplelink_cc32xx_sdk has been installed: C:\ti\simplelink_cc32xx_sdk_3_20_00_06\source\ti\devices\cc32xx.

driverlib cd

Click Select Folder.

driverlib make

Click Finish.

Choose Project, Build Project from the menu.

Wait until the message **** Build Finished **** appears in the Console window.

Connect the C3200AUDBOOST Audio BoosterPack with the CC3220S LAUNCHXL board

Now it is time to mount the C3200AUDBOOST Audio BoosterPack on top of the CC3220S LAUNCHXL board. The 2x10 pin Launchpad headers (P1, P2, P3, P4) connect the CC3200AUDBOOST board to the CC3220S LAUNCHXL. The headers provide the necessary interface to power up the audio boosterpack and access the I2C and I2S lines on the CC3220S LAUNCHXL board. While connecting to the CC3220S LAUNCHXL, ensure that the white 3V3 marker on the CC3220S LAUNCHXL board matches with the white triangle on the CC3200AUDBOOST boosterpack.

Connect boards

Run our demo program

The code and project files for the demo program are contained in a zip file which you can download here: line_in_2_line_out/ Download this file to your PC.

Start Code Composer Studio and choose a workspace directory. In this tutorial the workspace directory C:\workspace_v9\CC3220S is used. Choose Project, Import CCS Projects... from the menu.

Choose the Select archive file option and press Browse... Now select the file which you downloaded earlier and press Finish.

demo program import

Now connect your board to the PC and press the debug button debug. The debugger will stop the program when the function main is entered.

demo program main

Press the resume button demo application resume.

The demo program will now copy the signals (left and right) on the line input to the line output. You can use a signal generator and an oscilloscope to test the program. The input signal should be about 1 Vpp. Take care to connect the output signal of the signal generator to the line input of your board. Connecting two outputs together can damage your board. Alternatively you can use your smartphone and headset to test the program.

Inconvenience while debugging.

A problem occurs when a program which is using the CC3200AUDBOOST is paused, by using the pause button suspend or by setting a breakpoint, and then continued again using the resume button resume. Because the codec on the CC3200AUDBOOST board keeps sending samples via the I2S connection when the CC3220S processor is paused, the I2S controller inside the CC3220S will overflow and will not accept nor send anymore samples. Therefore, when you want to send or receive new samples after you paused the program you have to restart the program by using the restart button restart. TI is aware of this issue, but they have not provided a solution yet, see:


The datasheets and user guides for the CC3220S, Codec and boards can be found at:

The CC3220S SOC and C3254 Codec are both complicated IC's and the documentation can be quite overwhelming at first.

Lab Work Handbook

The Lab Work Handbook used in the TDS02 course can be found here:

Notes on developing an IIR filter using MATLAB's filter design tool

Developing an IIR filter using MATLAB's filter design tool proved to be more difficult than expected. See these notes: Notes on developing an IIR filter using MATLAB's filter design tool.