An example showing the use of CHIP on the Silicon Labs EFR32 MG12.
The EFR32 light switch example provides a baseline demonstration of a on-off light switch device, built using CHIP and the Silicon Labs gecko SDK. It can be controlled by a Chip controller over Openthread network.
The EFR32 device can be commissioned over Bluetooth Low Energy where the device and the Chip controller will exchange security information with the Rendez-vous procedure. Thread Network credentials are then provided to the EFR32 device which will then join the network.
The LCD on the Silabs WSTK shows a QR Code containing the needed commissioning information for the BLE connection and starting the Rendez-vous procedure.
The light switch example is intended to serve both as a means to explore the workings of CHIP as well as a template for creating real products based on the Silicon Labs platform.
Download the Simplicity Commander command line tool, and ensure that commander is your shell search path. (For Mac OS X, commander is located inside Commander.app/Contents/MacOS/.)
Download and install a suitable ARM gcc tool chain: GNU Arm Embedded Toolchain 9-2019-q4-major
Install some additional tools(likely already present for CHIP developers):
$ sudo apt-get install git libwebkitgtk-1.0-0 ninja-build```
$ brew install ninja
Supported hardware:
MG12 boards:
MG21 boards: Currently not supported due to RAM limitation.
MG24 boards :
Build the example application:
cd ~/connectedhomeip ./scripts/examples/gn_efr32_example.sh ./examples/light-switch-app/efr32/ ./out/light-switch-app BRD4161A
To delete generated executable, libraries and object files use:
$ cd ~/connectedhomeip $ rm -rf ./out/
OR use GN/Ninja directly
$ cd ~/connectedhomeip/examples/light-switch-app/efr32 $ git submodule update --init $ source third_party/connectedhomeip/scripts/activate.sh $ export EFR32_BOARD=BRD4161A $ gn gen out/debug $ ninja -C out/debug
To delete generated executable, libraries and object files use:
$ cd ~/connectedhomeip/examples/light-switch-app/efr32 $ rm -rf out/
Build the example with Matter shell
./scripts/examples/gn_efr32_example.sh examples/light-switch-app/efr32/ out/light-switch-app BRD4161A chip_build_libshell=true
Build the example as Sleepy End Device (SED)
$ ./scripts/examples/gn_efr32_example.sh ./examples/light-switch-app/efr32/ ./out/light-switch-app_SED BRD4161A --sed
or use gn as previously mentioned but adding the following arguments:
$ gn gen out/debug '--args=efr32_board="BRD4161A" enable_sleepy_device=true chip_openthread_ftd=false chip_build_libshell=true'
Build the example with pigweed RCP
$ ./scripts/examples/gn_efr32_example.sh examples/light-switch-app/efr32/ out/light-switch-app_rpc BRD4161A 'import("//with_pw_rpc.gni")'
or use GN/Ninja Directly
$ cd ~/connectedhomeip/examples/light-switch-app/efr32
$ git submodule update --init
$ source third_party/connectedhomeip/scripts/activate.sh
$ export EFR32_BOARD=BRD4161A
$ gn gen out/debug --args='import("//with_pw_rpc.gni")'
$ ninja -C out/debug
For more build options, help is provided when running the build script without arguments
./scripts/examples/gn_efr32_example.sh
On the command line:
$ cd ~/connectedhomeip/examples/lighting-app/efr32 $ python3 out/debug/chip-efr32-light-switch-example.flash.py
Or with the Ozone debugger, just load the .out file.
The example application is built to use the SEGGER Real Time Transfer (RTT) facility for log output. RTT is a feature built-in to the J-Link Interface MCU on the WSTK development board. It allows bi-directional communication with an embedded application without the need for a dedicated UART.
Using the RTT facility requires downloading and installing the SEGGER J-Link Software and Documentation Pack (web site).
Alternatively, SEGGER Ozone J-Link debugger can be used to view RTT logs too after flashing the .out file.
Download the J-Link installer by navigating to the appropriate URL and agreeing to the license agreement.
Install the J-Link software
$ cd ~/Downloads $ sudo dpkg -i JLink_Linux_V*_x86_64.deb
In Linux, grant the logged in user the ability to talk to the development hardware via the linux tty device (/dev/ttyACMx) by adding them to the dialout group.
$ sudo usermod -a -G dialout ${USER}
Once the above is complete, log output can be viewed using the JLinkExe tool in combination with JLinkRTTClient as follows:
Run the JLinkExe tool with arguments to autoconnect to the WSTK board:
For MG12 use:
$ JLinkExe -device EFR32MG12PXXXF1024 -if JTAG -speed 4000 -autoconnect 1
For MG21 use:
$ JLinkExe -device EFR32MG21AXXXF1024 -if SWD -speed 4000 -autoconnect 1
In a second terminal, run the JLinkRTTClient to view logs:
$ JLinkRTTClient
It is assumed here that you already have an OpenThread border router configured and running. If not see the following guide Openthread_border_router for more information on how to setup a border router on a raspberryPi.
Take note that the RCP code is available directly through Simplicity Studio 5 under File->New->Project Wizard->Examples->Thread : ot-rcp
For this example to work, it is necessary to have a second efr32 device running the lighting app example commissioned on the same openthread network
User interface : LCD The LCD on Silabs WSTK shows a QR Code. This QR Code is be scanned by the CHIP Tool app For the Rendez-vous procedure over BLE
* On devices that do not have or support the LCD Display like the BRD4166A Thunderboard Sense 2, a URL can be found in the RTT logs. <info > [SVR] Copy/paste the below URL in a browser to see the QR Code: <info > [SVR] https://dhrishi.github.io/connectedhomeip/qrcode.html?data=CH%3AI34NM%20-00%200C9SS0
LED 0 shows the overall state of the device and its connectivity. The following states are possible:
- Short Flash On (50 ms on/950 ms off): The device is in the
unprovisioned (unpaired) state and is waiting for a commissioning
application to connect.
- Rapid Even Flashing (100 ms on/100 ms off): The device is in the
unprovisioned state and a commissioning application is connected through
Bluetooth LE.
- Short Flash Off (950ms on/50ms off): The device is fully
provisioned, but does not yet have full Thread network or service
connectivity.
- Solid On: The device is fully provisioned and has full Thread
network and service connectivity.
Push Button 0
- _Press and Release_ : Start, or restart, BLE advertisement in fast mode. It will advertise in this mode
for 30 seconds. The device will then switch to a slower interval advertisement.
After 15 minutes, the advertisement stops.
- _Pressed and hold for 6 s_ : Initiates the factory reset of the device.
Releasing the button within the 6-second window cancels the factory reset
procedure. **LEDs** blink in unison when the factory reset procedure is
initiated.
Push Button 1
- Sends a Toggle command to bound light app
Matter shell
- 'switch on' : Sends On command to bound device - 'switch off' : Sends Off command to bound device - 'switch toggle : Sends Toggle command to bound device
You can provision and control the Chip device using the python controller, Chip tool standalone, Android or iOS app
Here is an example with the CHIPTool:
chip-tool pairing ble-thread 1 hex:<operationalDataset> 20202021 3840
chip-tool accesscontrol write acl '[{"fabricIndex": 1, "privilege": 3, "authMode": 2, "subjects": [1], "targets": null }]' <lighting-node-id> 0
chip-tool binding write binding '[{"fabricIndex": 1, "node": <lighting-node-id>, "endpoint": 1, "cluster":6}]' 1 1
$ sudo ip addr add dev <Network interface> 2002::2/64
$ sudo ip addr add dev <Network interface> 2002::1/64
#Add Ipv6 route on PC(Linux) $ sudo ip route add /64 via 2002::2
As part of building the example with RPCs enabled the chip_rpc python interactive console is installed into your venv. The python wheel files are also created in the output folder: out/debug/chip_rpc_console_wheels. To install the wheel files without rebuilding:
pip3 install out/debug/chip_rpc_console_wheels/*.whl
To use the chip-rpc console after it has been installed run:
python3 -m chip_rpc.console --device /dev/tty.<SERIALDEVICE> -b 115200 -o /<YourFolder>/pw_log.out
Then you can simulate a button press or release using the following command where : idx = 0 or 1 for Button PB0 or PB1 action = 0 for PRESSED, 1 for RELEASE Test toggling the LED with
rpcs.chip.rpc.Button.Event(idx=1, pushed=True)
You can also Get and Set the light directly using the RPCs:
rpcs.chip.rpc.Lighting.Get()
rpcs.chip.rpc.Lighting.Set(on=True, level=128, color=protos.chip.rpc.LightingColor(hue=5, saturation=5))
While most of the RAM usage in CHIP is static, allowing easier debugging and optimization with symbols analysis, we still need some HEAP for the crypto and OpenThread. Size of the HEAP can be modified by changing the value of the configTOTAL_HEAP_SIZE define inside of the FreeRTOSConfig.h file of this example. Please take note that a HEAP size smaller than 13k can and will cause a Mbedtls failure during the BLE rendez-vous or CASE session
To track memory usage you can set enable_heap_monitoring = true either in the BUILD.gn file or pass it as a build argument to gn. This will print on the RTT console the RAM usage of each individual task and the number of Memory allocation and Free. While this is not extensive monitoring you're welcome to modify examples/platform/efr32/MemMonitoring.cpp to add your own memory tracking code inside the trackAlloc and trackFree function