Digital I/O tweak

BusOut, PortOut, DigitalOut speedup

http://mbed.org/users/simon/notebook/busout-portout-digitalout-speedup/

After some chatting in the forums about slow I/O, I thought it'd be worth capturing...

  • The speed you could get from a PortOut concept; something that could allow you to write to multiple bits of a single port
  • The speed you could get from a DigitalOut that was optimised more, keeping the same API


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