Matter Light Switch Example Application#

An example application showing the use of Matter on the Texas Instruments CC13XX_26XX family of Wireless MCUs.

Matter Light Switch Example Application

Introduction#

The CC13XX_26XX light-switch example application provides a working demonstration of a connected light-switch device. This uses the open-source Matter implementation and the Texas Instruments SimpleLink™ CC13XX and CC26XX software development kit.

This example is enabled to build for CC1354P10 devices.

The light-switch example is intended to serve both as a means to explore the workings of Matter, as well as a template for creating real products based on the Texas Instruments devices.

Device UI#

Action	Functionality
Left Button (`BTN-1`) Press (less than 1000 ms)	Turns connected bulb off
Left Button (`BTN-1`) Press (more than 1000 ms)	Factory Reset
Right Button (`BTN-2`) Press (less than 1000 ms)	Turns connected bulb on
Right Button (`BTN-2`) Press (more than 1000 ms)	BLE Advertisement (Enable/Disable)

When the device has LIT ICD functionality enabled (chip_enable_icd_lit set to true in args.gni), the functionality of the short button presses changes as described below:

Action	Functionality
Left Button (`BTN-1`) Press (less than 1000 ms)	User Active Mode Trigger
Right Button (`BTN-2`) Press (less than 1000 ms)	Connected Bulb is toggled

Building#

Preparation#

Some initial setup is necessary for preparing the build environment. This section will need to be done when migrating to new versions of the SDK. This guide assumes that the environment is linux based, and recommends Ubuntu 20.04.

Download and install SysConfig. This can be done simply with the following commands.

$ cd ~
$ wget https://dr-download.ti.com/software-development/ide-configuration-compiler-or-debugger/MD-nsUM6f7Vvb/1.18.1.3343/sysconfig-1.18.1_3343-setup.run
$ chmod +x sysconfig-1.18.1_3343-setup.run
$ ./sysconfig-1.18.1_3343-setup.run

Run the bootstrap script to setup the build environment.
Note, a recursive submodule checkout is required to utilize TI’s Openthread reference commit.
Note, in order to build the chip-tool and ota-provider examples, a recursive submodule checkout is required for the linux platform as seen in the command below.
```
$ cd ~/connectedhomeip
$ source ./scripts/bootstrap.sh
$ ./scripts/checkout_submodules.py --shallow --platform cc13xx_26xx linux --recursive
```

Compilation#

It is necessary to activate the environment in every new shell. Then run GN and Ninja to build the executable.

Activate the build environment with the repository activate script.
```
$ cd ~/connectedhomeip
$ source ./scripts/activate.sh
```
Run the build to produce a default executable. By default on Linux both the TI SimpleLink SDK and Sysconfig are located in a ti folder in the user’s home directory, and you must provide the absolute path to them. For example /home/username/ti/sysconfig_1.18.1. On Windows the default directory is C:\ti. Take note of this install path, as it will be used in the next step.
```
$ cd ~/connectedhomeip/examples/lock-app/cc13x4_26x4
$ gn gen out/debug --args="ti_sysconfig_root=\"$HOME/ti/sysconfig_1.18.1\""
$ ninja -C out/debug
```
If you would like to define arguments on the command line you may add them to the GN call.
```
gn gen out/debug --args="ti_sysconfig_root=\"$HOME/ti/sysconfig_1.18.1\" target_defines=[\"CC13X4_26X4_ATTESTATION_CREDENTIALS=1\"] chip_generate_link_map_file=true"
```

Programming#

Loading the built image onto a LaunchPad is supported through two methods; Uniflash and Code Composer Studio (CCS). UniFlash can be used to load the image. Code Composer Studio can be used to load the image and debug the source code.

Code Composer Studio#

Programming with CCS will allow for a full debug environment within the IDE. This is accomplished by creating a target connection to the XDS110 debugger and starting a project-less debug session. The CCS IDE will attempt to find the source files on the local machine based on the debug information embedded within the ELF. CCS may prompt you to find the source code if the image was built on another machine or the source code is located in a different location than is recorded within the ELF.

Download and install Code Composer Studio.

First open CCS and create a new workspace.

Create a target connection (sometimes called the CCXML) for your target SoC and debugger as described in the Manual Method section of the CCS User’s Guide.

Next initiate a project-less debug session as described in the Manual Launch section of the CCS User’s Guide.

CCS should switch to the debug view described in the After Launch section of the User’s Guide. The SoC core will likely be disconnected and symbols will not be loaded. Connect to the core as described in the Debug View section of the User’s Guide. Once the core is connected, use the Load button on the toolbar to load the ELF image.

Note that the default configuration of the CCXML uses 2-wire cJTAG instead of the full 4-wire JTAG connection to match the default jumper configuration of the LaunchPad.

UniFlash#

Uniflash is Texas Instrument’s uniform programming tool for embedded processors. This will allow you to erase, flash, and inspect the SoC without setting up a debugging environment.

Download and install UniFlash.

First open UniFlash. Debug probes connected to the computer will usually be displayed under the Detected Devices due to the automatic device detection feature. If your device does not show up in this view it my be disconnected, or you may have to create a New Configuration. If you already have a CCXML for your SoC and debug connection you can use that in the section at the bottom. Once your device is selected, click the Start button within the section to launch the session.

Select the ELF image to load on the device with the Browse button. This file is placed in the out/debug folder by this guide and ends with the *.out file extension. For OTA enabled applications, the standalone image will instead end with the *-mcuboot.hex file extension. This this is a combined image with application and MCUBoot included. The flag to enable or disable the OTA feature is determined by “chip_enable_ota_requestor” in the application’s args.gni file.

Finally click the Load Image button to load the executable image onto the device. You should be able to see the log output over the XDS110 User UART.

Note that programming the device through JTAG sets the Halt-in-Boot flag and may cause issues when performing a software reset. This flag can be reset by power-cycling the LaunchPad.

Viewing Logging Output#

By default the log output will be sent to the Application/User UART. Open a terminal emulator to that port to see the output with the following options:

Parameter	Value
Speed (baud)	`115200`
Data bits	`8`
Stop bits	`1`
Parity	`None`
Flow control	`None`

Running the Example#

Once a device has been flashed with this example, it can now join and operate in an existing Matter network. The following sections assume that a Matter network is already active, and has at least one OpenThread Border Router.

For insight into what other components are needed to run this example, please refer to our Matter Getting Started Guide.

The steps below should be followed to commission the light-switch device onto the network and control it once it has been commissioned.

Step 0

Set up the CHIP tool by following the instructions outlined in our Matter Getting Started Guide.

Step 1

First, you will need to have a lighting app device setup and commissioned into the Matter network. Look through the README.md file for lighting app for building and commissioning instructions for the default lighting app.

Commission the light-switch device onto the Matter network. Run the following command on the CHIP tool:

./chip-tool pairing ble-thread <nodeID - e.g. 1> hex:<complete dataset from starting the OTBR> 20202021 3840

Interacting with the application begins by enabling BLE advertisements and then pairing the device into a Thread network. To provision this example onto a Matter network, the device must be discoverable over Bluetooth LE.

On the LaunchPad, press and hold the right button, labeled BTN-2, for more than 1 second. Upon release, the Bluetooth LE advertising will begin. Once the device is fully provisioned, BLE advertising will stop.

Once the device has been successfully commissioned, you will see the following message on the CHIP tool output:

[1677648218.370754][39785:39790] CHIP:CTL: Received CommissioningComplete response, errorCode=0
[1677648218.370821][39785:39790] CHIP:CTL: Successfully finished commissioning step 'SendComplete'

An accompanying message will be seen from the device:

Commissioning complete, notify platform driver to persist network credentials.

You can check if the light-switch is able to receive commands from CHIP-TOOL by using this command:

./chip-tool basicinformation read vendor-id <light_switch_node_ID> 0

Step 2

Send commands to the light-switch app.

Here is how you can bind the light-switch app to a lighting app device:

Tell the lighting device to give the light-switch device access to it’s onoff cluster (replace <> with lighting/light-switch node IDs):

./chip-tool accesscontrol write acl '[{"fabricIndex": 1, "privilege": 5, "authMode": 2, "subjects": [112233], "targets": null}, {"fabricIndex": 1, "privilege": 3, "authMode": 2, "subjects": [<light-switch_node_ID>], "targets": [{"cluster": 6, "endpoint": 1, "deviceType": null}]}]' <lighting_node_ID> 0

Tell the light-switch device to bind to the onoff cluster on the lighting device (replace <> with lighting/light-switch node IDs):

./chip-tool binding write binding '[{"fabricIndex": 1, "node": <lighting_node_id>, "endpoint": 1, "cluster": 6}]' <light-switch_node_id> 1

Now you can press the Right BTN on the light-switch device and it will turn ON the RED LED on the lighting device. Press the Left BTN on the light-switch device to turn OFF the RED LED on the lighting device. If the devices aren’t bound properly the light-switch will display on UART that the Switch On/Off operation has been completed but the lighting device’s LEDs will not turn on/off accordingly.

TI Support#

For technical support, please consider creating a post on TI’s E2E forum. Additionally, we welcome any feedback.

Matter Light Switch Example Application

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