Hello,
this GPIO use-case (press a hardware button on the development board) is shown in the example "DeviceIntegration" that you will find within your Build Environment within the subdirectory /Examples. This demo shows how to switch on/off the hardware LED when you press a button within a GUI application and how to change the user interface when a hardware button is pressed.
Please have a look to the chapter Device Class and Device Driver? It describes the necessary concepts.
Best regards,
Manfred.
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