This is a very simple guide, reviewing the steps required to get Blinky working on an Mbed OS platform.

Mbed OS Blinky

This example shows the use of a DigitalOut object to represent an LED and use of the nonblocking Thread::wait() call. Using nonblocking calls is good practice because Mbed OS can schedule and run other threads while the first thread is waiting.

Building this example

Building with Arm Mbed CLI

To use Mbed CLI to build this example, follow the instructions in the documentation. The instructions here relate to using the Arm Online Compiler.

To use the Online Compiler, import this code into the Online Compiler, and select your platform from the top right. Compile the code using the compile button, load it onto your board and press the reset button on the board. The code will run on the board, and you will see the LED blink.

You can find more instructions for using the Mbed Online Compiler in the documentation.

19 months ago

File content as of revision 102:6979ad8bc0bc:

# Blinky Mbed OS example

The example project is part of the [Arm Mbed OS Official Examples]( and is the [getting started example for Mbed OS]( It contains an application that repeatedly blinks an LED on supported [Mbed boards](

You can build the project with all supported [Mbed OS build tools]( However, this example project specifically refers to the command-line interface tool [Arm Mbed CLI](
(Note: To see a rendered example you can import into the Arm Online Compiler, please see our [import quick start](

1. [Install Mbed CLI](

1. Clone this repository on your system, and change the current directory to where the project was cloned:

    $ git clone && cd mbed-os-example-blinky

    Alternatively, you can download the example project with Arm Mbed CLI using the `import` subcommand:

    $ mbed import mbed-os-example-blinky && cd mbed-os-example-blinky

## Application functionality

The `main()` function is the single thread in the application. It toggles the state of a digital output connected to an LED on the board.

## Building and running

1. Connect a USB cable between the USB port on the board and the host computer.
2. <a name="build_cmd"></a> Run the following command to build the example project and program the microcontroller flash memory:
    $ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash
The binary is located at `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-blinky.bin`.

Alternatively, you can manually copy the binary to the board, which you mount on the host computer over USB.

Depending on the target, you can build the example project with the `GCC_ARM`, `ARM` or `IAR` toolchain. After installing Arm Mbed CLI, run the command below to determine which toolchain supports your target:

    $ mbed compile -S

## Expected output
The LED on your target turns on and off every 500 milliseconds.

## Troubleshooting
If you have problems, you can review the [documentation]( for suggestions on what could be wrong and how to fix it.

## Related Links

* [Mbed OS Stats API](
* [Mbed OS Configuration](
* [Mbed OS Serial Communication](
* [Mbed OS bare metal](
* [Mbed boards](

### License and contributions

The software is provided under Apache-2.0 license. Contributions to this project are accepted under the same license. Please see for more info.

This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide.