GPIB

Introduction

 * http://www.ni.com/gpib/what_is.htm / http://en.wikipedia.org/wiki/IEEE-488
 * it is one of a communication standard of most equipments
 * A interface(in both hw & sw) to any platforms, such as dspic33 board, bf1 board ...

I2C protocol

 * apply as one to many(can be different kind of devices)
 * different platforms
 * for dspic, sw driver implement in freertos following posix arch.
 * for bf1 pf, sw driver implment in uclinux following posix arch.

adding RS232 Interface

 * reference -- http://sine.ni.com/nips/cds/view/p/lang/en/nid/203553