Uwe Bonnes wrote:
> >>>>> "Jim" == Jim Paris <jim@xxxxxxxx> writes:
>
> ...
> >> results. However with the RS232 pattern you can't easily measure
> >> exact frequency with the scope.
> ^^^^^
> Jim> If you send a continuous string of UUUUU then you'll see the base
> Jim> frequency as a simple square wave.
>
> But the square wave is disturbed by the start/stop bits and the
> turnaround between bytes. So you can estimate the frequency, but not measure
> exact.
If you're using 8 data bits, no parity, and 1 stop bit, it'll be an
exact undisturbed square wave. Try it, you'll see :) The turnaround
between bytes will be zero as long as you don't let the FTDI buffer
underflow.
-jim
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