Subject:
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Re: USB Host and Slave
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 10 Jan 2006 06:25:21 GMT
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Viewed:
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1792 times
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In lugnet.robotics, dan miller <danbmil99@yahoo.com> wrote:
> look up "USB on the go", it's basically what you describe -- a minimal host
> for peripheral-to-periperal connections.
I don't know that it will really do what people are wanting (interface the NXT
to a USB camera or USB FLASH dongle), but there *IS* a way to convert a USB
device (the NXT, for instance) into a USB on-the-go (OTG) Host!
Philips announced a bridge chip for accomplishing this very task a while back:
http://www.semiconductors.philips.com/news/content/file_953.html
Here is a pdf app note that explains things (including the protocol) in more
detail:
http://www.semiconductors.philips.com/acrobat_download/applicationnotes/AN10034_2.pdf
What's a little strange, though, is that I can't find any recent datasheet on
the part. It could be that I'm looking in the wrong place or it could be that
Phillips didn't follow up on producing the part.
But, it may not be necessary to build a usb-to-usb dongle from scratch, because
there are at least three already on the market:
http://www.usbgear.com/USBG-OTG1.html
http://tekgems.com/Products/et-16406-net-otg-103.htm?frg
http://www.delkin.com/delkin_products_usb_bridge.html
What's notable, however, is that all the devices state clearly that they are
intended to interface two mass storage devices. The Philips chip showed an
example more like what we're talking about here: using a PDA (or the NXT) to
access data on another USB device. Even if a person could figure out a way to
do that, it might be quite slow because there are several operations necessary
just to retrieve one piece of data from the other device.
Oh well, lots of food for thought.
Mike
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Message has 1 Reply:
 | | Re: USB Host and Slave
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| (...) NXT (...) back: (...) (URL) (...) that (...) because (...) to (...) necessary (...) Mike Try searching for ISP1362 and ISP1761 on the Philips site. I beleive the ISP1261 is no longer available. I was able to find data on the other two chips. (...) (19 years ago, 13-Jan-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: USB Host and Slave
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| look up "USB on the go", it's basically what you describe -- a minimal host for peripheral-to-periperal connections. (...) ___...___ Yahoo! DSL – Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com (19 years ago, 9-Jan-06, to lugnet.robotics)
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