Subject: Re: Problems with FT232R in bitbang mode
On Friday, 14. May 2010 22:48:07 Helge Lenz wrote:
> So is there any way to make it work with this type of chip or should I
> stop trying and use something else? The one thing that I have not tried
> so far is to put the signal to one of the CBUS lines and use the CBUS
> bitbang mode. So could this be an option to make it work? Or should I
> use the D2XX library for linux instead of libftdi?
> I would really appreciate some hints.
The USB bus doesn't give you a guarantee about the timing, so it might
be too slow to properly modulate a clean carrier signal. There is the
isochronous USB mode which sounds suitable for this kind of application,
though it doesn't handle USB packet loss at all.
Maybe add a small microcontroller to act as a receive buffer and to modulate
a clean carrier signal? Then you are in control what is happening
with the signal...
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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