USB : Overview    USB Is Like A Railroad  

Finally, there are the most complicated USB devices of all: devices that can act as either a Master ("Host") or a Slave ("Peripheral"), depending on how they are connected to a special USB cable.

Dual role devices like this are called "USB On The Go" devices.

These relatively new devices tend to be bigger 32 bit processors, and yes, there is a lot of work that must go into programming devices like this.



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