Example Description

This example describes how to use GPIO read/write by mbed api.

Requirement Components:
    a LED
    a push button

Pin name PA_12 and PA_5 map to GPIOA_12 and GPIOA_5:
 - PA_12 as input with internal pull-high, connect a push button to this pin and ground.
 - PA_5 as output, connect a LED to this pin and GND.

In this example, the LED is off when the push button is pressed.