USB host (was Re: What's the real problem with wireless on the Ben?)

Ron K. Jeffries rjeffries at
Wed Sep 14 13:05:27 EDT 2011

LUFA may also be of interest:
Ron K. Jeffries

On Wed, Sep 14, 2011 at 04:47, Werner Almesberger <werner at>wrote:

> Uwe Dippel wrote:
> > Therefore, the topic 'host' on USB is and remains a hot one.
> By the way, if someone wants to experiment, here's an idea:
> At least one purely software implementation of USB device
> functionality exists, in the form of V-USB for AVRs:
> You could take the same approach and try to apply it to the Ben
> for the host side. Host should even be easier than device because
> all activities on the USB bus are initiated by the host, which
> leads to a very narrow time window in which the host would have
> to wait/poll for data.
> On the electrical side, much of what you need could be
> accomplished with UBB. You'd still need to supply 5 V (for
> development, an external supply would do. Later, you could add
> a step-up converter to supply, say, 5 V at 100 mA from the Ben).
> You'd also need a few logic gates to sort out the pull-up/down
> resistor situation for detecting Low- and Full-Speed, but that
> can probably wait, too.
> - Werner
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