Matter MCXW71 Door Lock Example Application#

For generic information related to door lock application, please see the common README.

Introduction#

The following board was used when testing this Matter reference app for an mcxw71 device: FRDM-MCXW71

Device UI#

The state feedback is provided through LED effects:

widget

effect

description

LED2

short flash on (50ms on/950ms off)

The device is in an unprovisioned (unpaired) state and is waiting for a commissioner to connect.

LED2

rapid even flashing (100ms period)

The device is in an unprovisioned state and a commissioner is connected via BLE.

LED2

short flash off (950ms on/50ms off)

The device is fully provisioned, but does not yet have full network (Thread) or service connectivity.

LED2

solid on

The device is fully provisioned and has full network and service connectivity.

RGB LED

on

The LockState attribute of the DoorLock cluster is Unlocked.

RGB LED

off

The LockState attribute of the DoorLock cluster is Locked.

NOTE: LED2 will be disabled when OTA is used. On MCXW71 board, PTB0 is wired to both LED2 and CS (Chip Select) of the External Flash Memory. Since the OTA image is stored in external memory, LED2 operations will affect OTA operation by corrupting packages and OTA will not work.

The user actions are summarized below:

button

action

state

output

SW2

short press

not commissioned

Enable BLE advertising

SW2

short press

commissioned + device is LIT

Enable Active Mode

SW2

long press

NA

Initiate a factory reset (can be cancelled by pressing the button again within the factory reset timeout limit - 6 seconds by default)

SW3

short press

NA

Toggle attribute LockState value

SW3

long press

NA

Clean soft reset of the device (takes into account proper Matter shutdown procedure)

Building#

Manually building requires running the following commands:

user@ubuntu:~/Desktop/git/connectedhomeip$ cd examples/lock-app/nxp/mcxw71
user@ubuntu:~/Desktop/git/connectedhomeip/examples/lock-app/nxp/mcxw71$ gn gen out/debug
user@ubuntu:~/Desktop/git/connectedhomeip/examples/lock-app/nxp/mcxw71$ ninja -C out/debug

Please note that running gn gen out/debug without --args option will use the default gn args values found in args.gni.

After a successful build, the elf and srec files are found in out/debug/. See the files prefixed with chip-mcxw71-lock-example.

Flashing#

Two images must be written to the board: one for the host (CM33) and one for the NBU (CM3).

The image needed on the host side is the one generated in out/debug/ while the one needed on the NBU side can be found in the downloaded NXP-SDK package at path - middleware\wireless\ieee-802.15.4\bin\k32w1\k32w1_nbu_ble_15_4_dyn_matter.sb3.

Flashing the NBU image#

NBU image should be written only when a new NXP SDK is released.

  1. Install Secure Provisioning SDK tool using Python:

    pip install spsdk

    Note: There might be some dependencies that cause conflicts with already installed Python modules. However, blhost tool is still installed and can be used.

  2. Updating NBU for Wireless examples

    It is necessary to work with the matching NBU image for the SDK version of the application you are working with. This means that when you download your SDK, prior to loading any wireless SDK example, update your NBU image with the SDK provided binaries. For FRDM users, please write the following binary:

    middleware\wireless\ieee-802.15.4\bin\mcxw71\mcxw71_nbu_ble_15_4_dyn_matter_<nbu_version>.sb3

    Please note that <nbu_version> may vary depending on the SDK version.

    1. Place your device in ISP mode.

      • Make sure a jumper is placed on JP25

      • Press and hold SW4, press and release Reset, then release SW4

    2. Once the device is connected, you may find the assigned port by running:

      nxpdevscan

    3. Run the blhost command to write the sb3 file:

      blhost -p <assigned_port> receive-sb-file <path_to_SDK>\middleware\wireless\ieee-802.15.4\bin\mcxw71\mcxw71_nbu_ble_15_4_dyn_matter_<nbu_version>.sb3

Flashing the host image#

Host image is the one found under out/debug/. It should be written after each build process.

If debugging is needed then jump directly to the Debugging section. Otherwise, if only flashing is needed then JLink 7.84b or greater can be used:

  • Plug MCXW71 to the USB port (no need to keep the SW4 button pressed while doing this, e.g. ISP mode is not needed for host flashing)

  • Connect JLink to the device:

    JLinkExe -device MCXW71 -if SWD -speed 4000 -autoconnect 1

  • Run the following commands:

    reset
halt
loadfile chip-mcxw71-lock-example.srec
reset
go
quit

Debugging#

One option for debugging would be to use MCUXpresso IDE.

  • Drag-and-drop the zip file containing the NXP SDK in the “Installed SDKs” tab:

Installed SDKs

  • Import any demo application from the installed SDK:

Import SDK example(s).. -> choose a demo app (demo_apps -> hello_world) -> Finish

Import demo

  • Flash the previously imported demo application on the board:

Right click on the application (from Project Explorer) -> Debug as -> JLink/CMSIS-DAP

After this step, a debug configuration specific for the MCXW71 board was created. This debug configuration will be used later on for debugging the application resulted after ot-nxp compilation.

  • Import Matter repo in MCUXpresso IDE as Makefile Project. Use none as Toolchain for Indexer Settings:

File -> Import -> C/C++ -> Existing Code as Makefile Project

New Project

  • Replace the path of the existing demo application with the path of the MCXW71 application:

Run -> Debug Configurations... -> C/C++ Application

Debug MCXW71

OTA#

Please see mcxw71 OTA guide.

Multiple BLE connections#

To compile with the Multiple BLE connections support demo example add the gn argument nxp_multiple_ble_connections=true.

The application will accept multiple BLE connections after commissioning, by pressing the BLE advertise button again. Once discovered by a BLE central, a custom GATT service will be visible on the device.

The user can change the default behavior by implementing the class defined in BLEApplicationManager.h