This year, the Bluetooth Special Interest Group (SIG) hosted a session on Bluetooth® Mesh Provisioning and Interoperability at Bluetooth Asia 2019. Developers who attended the session were able to use their smartphones to provision and control a micro:bit board running a Zephyr solution.

For those developers who were not able to attend, this follow-up article shows you step by step how to build the firmware for micro:bit. 

Set Up the Dev Environment

To set up the development environment on your computer, perform the following steps.

  1. Set Up a Development System
  2. Get the Source code
  3. Install Python Dependencies
  4. Set Up a Toolchain
  5. Build and Run an Application

Build the Firmware

To build the firmware, do the following.

  • Open exe (Windows) or Terminal (macOS), navigate to the main project directory
  • Type below command, switch to tag v1.14.0.
    1.  

git checkout -b branch_v1.14 v1.14.0

  • Download source code here
  • Unzip source code file in the folder ./zephyr/samples/ like below

  • Depending on your computer OS, then:

# On Linux/macOS

cd samples/BluetoothAsia2019/Bluetooth_Mesh_Provisioning_Sample

mkdir build && cd build

 

# On Windows

cd samplesBluetoothAsia2019Bluetooth_Mesh_Provisioning_Sample

mkdir build & cd build

 

cmake -GNinja -DBOARD=bbc_microbit ..

ninja

The main build products are in samples/BluetoothAsia2019/Bluetooth_Mesh_Provisioning_Sample/build/zephyr. The final application binary in HEX format is named zephyr.hex by default.

Flash Firmware

For the flash firmware, follow the steps below.

  • Connect the micro:bit to your laptop by USB cable
  • Use one serial terminal software; use Tera Term or Putty on Windows or use this guide on macOS or Linux. The serial port setting is: 115200, 8-N-1
  • Copy zephyr.hex and paste it in the volume of the micro:bit on your computer
  • Information prints on the serial console

  • If you can see above screenshot, it means the build and flash firmware was successful. The Device Name varies, as it depends on the micro:bit factory unique identifier.

To learn more about developing with Bluetooth® Mesh and other Bluetooth technologies, visit the Bluetooth SIG resources page.

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