[GreenKeys] USB to TTY-loop possibility...

Jim Haynes jhhaynes at earthlink.net
Fri Nov 2 16:37:03 EDT 2012


On Fri, 2 Nov 2012, epvgk at limpoc.com wrote:

> It has an internal UART which *can* generate the right framing, except that
> in order for USB to work you have to clock it high enough that the UART won't
> run at TTY speeds. I actually generate the characters (and decode, for that
> matter) with a state machine in an interrupt routine that can be clocked
> anywhere from 0.24 baud to hundreds of Kbaud.
>
OK.  I think someone mentioned a particular make of USB to COM port 
adapter that would actually run at TTY speeds, which most of them will 
not.



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