To actually see what is happening on the development board while the application is running, you must set up a J-Link debugging session.

  1. Open your project in SEGGER Embedded Studio (SES).
  2. Select Debug > Go.
    Alternatively, press F5.
    The debugging interface looks like this:
    Debugging interface
    By default, the application will break in main. You can set additional break points, single-step through the application, read registers, and so on.
This video tutorial shows you how to use SES for debugging: