Subject:
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USB Host and Slave
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Jan 2006 14:39:10 GMT
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Original-From:
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PeterBalch <peterbalch@compuserve.^Spamcake^com>
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Viewed:
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1551 times
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> > > You can buy Flash memory USB 'thumb drives' for $8.50 in quantity
> > > with anywhere from 128Mbytes upwards.
> >
> > How hard is it to interface a thumb drive with a device like the • ARM?
>
> It would be pretty tough.
>
> > From other discussion here the difference between slave and master • USB devices seems
> > to be important.
>
> Yes. It's crucial.
There's been a lot of discussion of how hard it is to make a USB host
compared to a Slave.
But that's a general-purpose USB host (like a PC). What if it were a
"special purpose" host.
The slave probably doesn't care if it has been interrogated, negotiated and
enumerated or whatever. If if the host already knew what the slave was
(e.g. it's always a thumb drive) then writing the host would be a whole lot
easier. Perhaps.
Has anyone done it? (Not for a PC but for a PIC or ARM.)
Useful cheap USB devices would be a thumb drive, a webcam, an optical
mouse, etc.
Peter
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Message has 3 Replies:
 | | 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 (18 years ago, 9-Jan-06, to lugnet.robotics)
| | | Re: USB Host and Slave
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| (...) One VERY significant electrical difference is that the host provides power to run the slave. Since the NXT thinks it's a slave, it won't provide power - so your thumb drive will have no power. So - no matter what, there is at least *SOME* (...) (18 years ago, 9-Jan-06, to lugnet.robotics)
| | | Re: USB Host and Slave
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| (...) I'd say: Why bother? Connect whatever device you need to the PC, and have it talk to the NXT either via Bluetooth or USB. OK, you'll need a Software on the host PC, but for some peripherals, the NXT will just not do, regardless of wether you (...) (18 years ago, 10-Jan-06, to lugnet.robotics)
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