
Demonstrations for EBUS.

What is this demo doing :

    1.Any signal input to PA12, both FallingEdge and RisingEdge are detectable.
	2.Signal output at PB8(EBUS CH3).
         _   _
        | |_| |_ -- signal input --> IOPORT_CH3_SEL0 (PA12) -- EBUS CH3 --> Output to PB8


