You can connect your board to your computer over USB. This works out of the box on Linux and macOS. If you are using Windows, you may need to install a serial port driver:

Windows 10 driver for mbed serial port. Hello, I have a board with an NXP LPC1768 running ARM mbed firmware (note that due to some technical problems I cannot confirm the exact version). I am connecting to it over an USB-serial connection. My host OS is Windows 10 Home, Version 1511, OS Build 10586.3. The VCOM / serial port driver supports autobaud, with speeds up to 115200; The VCOM driver has a cleaner installation (mbed serial port driver needs board to be plugged in to install, which is a little unusual) The firmware auto-detects if a target serial port connection is present and enumerates a driver if they are.

1. Download the Arm Mbed Windows serial port driver.
2. Plug in your Arm Mbed device over USB. It mounts as an Mbed drive.
3. Close all Explorer windows showing the Mbed drive.
4. Run the installer. This may take some time or display a few 'unsigned driver' warnings.

Troubleshooting

If you have multiple Mbed devices but the serial port only appears for one of them: Make sure you run the installer for every device (plug in the device over USB and run the installer again); Windows loads the driver based on the serial number, so it needs to be run for each device individually.

If the installer fails because No mbed Microcontrollers were found: Check your device is plugged in properly over USB.

If the installer reports the message mbedWinSerial_nnnnn.exe is not a valid Win32 application: If you downloaded the installer using Internet Explorer, please try a different browser (Firefox, Chrome).

Mbed Serial Driver

Driver Windows 10 64-bit Download

If the installer appears to hang: Check if Windows is displaying an 'unsigned driver/permission' window; these often get hidden behind other windows with nothing to indicate so in the taskbar. The installer will continue to run as soon as you click OK.