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The previous value of 512 B is often insufficient when using
the printf family of functions.

New objective:
 - Toggle D1 with 2 Hz
 - Turn off D2 if USR_SW1 is pressed
 
Also, refine comments and explain the timing better.

GPIOPadConfigGet() requires pin number as second parameter instead of
bit packed representation

Reordered GPIOPadConfig*() and GPIOPinTypeOutput() to let GPIOPadConfig*
() take effect