Using mbed with Beetle

mbedOS support for Beetle

mbedOS is supported on Arm's Beetle platform, see the following links for more information:

For general questions and other support articles on the Beetle platform see here.

Setting up the Beetle hardware

Note: These instructions assume the Beetle board has been correctly configured for normal operation.

Please proceed with caution if you've modified the board in any way as programming it with the wrong configuration could leave it an unusable state.

The Beetle board configured for normal operation

The Beetle board configured for normal operation i.e. no jumpers attached

The Beetle board has a single mini USB-B connector providing:

  • External 5V power to the board
  • Debug support via USB (without the need for external JTAG probe)
    • DMSIS-DAP based debug connections are supported by both Keil MDK and GDB/OpenOCD
  • Drag-and-drop programming of binaries into Flash
    • The Beetle will appear as a USB mounted mass storage device on your host PC
  • Serial comms

Setting up your development environment

The examples below assume a working mbed CLI development environment. For information on setting up this environment pleaswe refer to the mbed-cli documentation.

Both GCC and armcc are supported. These instructions were testing using `gcc-arm-none-eabi-5_2-2015q4' (from here) and with armcc v5.0.6.

An exporter is available for users wishing to build and debug within Keil MDK / uVision.

The serial terminal settings for connecting to Beetle are:

  • 9600 baud
  • 8-bit word length
  • No parity
  • 1 stop bit
  • No flow control

Note: Windows users will need to following the instructions here to install the required drivers.

mbedOS examples for Beetle

Arm provide two mbedOS examples for the Beetle platform:

See the `README' files in those git repositories for more information.

To write the application to Flash and execute it:

  • Using CMSIS-DAP drag-and-drop:
    1. The build process will create a binary
    2. Drag-and-drop this binary to the USB mounted mass storage device named `MBED'
    3. Ensure the copy completes
      • For example by issuing a `$ sync' command if your host PC is running Linux
    4. Press the `RST' button on the Beetle board to run the application
  • Using Keil MDK:
    • The Keil MDK Pack includes a Flash driver allowing the executable .ELF to be written directly to Flash by the debugger
      • See here for more information
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