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'[PIC:] USB pins, direct access?'
2004\08\17@023201 by Octavio Nogueira

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Is there any way to access the A end B data pins
of a USB port? Just like we do with the printer port?

Regards,

Octavio Nogueira
Tato Equipamentos Eletrônicos Ltda
(11) 5506-5335
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2004\08\17@080251 by Josh Koffman

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Do you mean to flip the pins directly from say a Visual Basic program
running on a computer? If so, I believe the answer is no.

Josh
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On Tue, 17 Aug 2004 03:30:51 -0300, Octavio Nogueira
<nogueiraspamKILLspamtato.ind.br> wrote:
> Is there any way to access the A end B data pins
> of a USB port? Just like we do with the printer port?

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2004\08\17@082201 by Russell McMahon

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> > Is there any way to access the A end B data pins
> > of a USB port? Just like we do with the printer port?

> Do you mean to flip the pins directly from say a Visual Basic program
> running on a computer? If so, I believe the answer is no.

Something in there knows how to. It's a sad day when a man no longer has
access to his own hardware :-)


       RM

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2004\08\17@085148 by Olin Lathrop

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Octavio Nogueira wrote:
> Is there any way to access the A end B data pins
> of a USB port? Just like we do with the printer port?

You'd have to write your own device driver.  If you did, it wouldn't be USB
anymore as that would violate a bunch of provisions in the standard.


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2004\08\17@090018 by Alan B. Pearce

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> Is there any way to access the A end B data pins
> of a USB port? Just like we do with the printer port?

Why ever would you want to do that? It just cannot be done with standard
hardware.

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2004\08\17@092512 by Randy Glenn

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Even if you could manipulate the pins of a USB controller itself
(which I doubt), I think you'll find that most USB cards have a USB
hub chip on them, which the physical ports are connected to. USB hubs
are smart devices that actually inspect the traffic before relaying
it, IIRC, so simply asserting a 1 or 0 on the DATA+/- line at the
controller won't accomplish anything in the end.

On Tue, 17 Aug 2004 03:30:51 -0300, Octavio Nogueira
<KILLspamnogueiraKILLspamspamtato.ind.br> wrote:
{Quote hidden}

-- -Randy Glenn
Computer Eng. and Mgt. Year IV, McMaster University
Chair, McMaster IEEE Student Branch

randy.glenn-at-gmail.com - glennrb-at-mcmaster.ca
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http://www.randyglenn.ca

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2004\08\17@102154 by Russell McMahon

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> > Is there any way to access the A end B data pins
> > of a USB port? Just like we do with the printer port?
>
> Why ever would you want to do that? It just cannot be done with standard
> hardware.

An engineers gotta do what an engineers gotta do (or gotta try anyway).
Consider - why would anyone want to use a perfectly good printer port for
anything except driving a printer ?

The idea of having a bus (potentially) capable of hundreds of Mbps under
one's direct control sounds very exciting. Need there be a better reason
than that? :-).


       RM

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2004\08\17@155551 by William Chops Westfield

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On Aug 17, 2004, at 5:21 AM, Russell McMahon wrote:

>> Do you mean to flip the pins directly from say a Visual Basic program
>> running on a computer? If so, I believe the answer is no.
>
> Something in there knows how to.

Huh?  It's like asking to flip the actual bits on your ide, floppy, or
ethernet cable.  Even  if you could, it would be a really bad idea.

BillW

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2004\08\17@165848 by Andrew Warren

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Randy Glenn <EraseMEPICLISTspammitvma.mit.edu> wrote:

> Even if you could manipulate the pins of a USB controller itself
> (which I doubt), I think you'll find that most USB cards have a
> USB hub chip on them, which the physical ports are connected to.
> USB hubs are smart devices that actually inspect the traffic before
> relaying it, IIRC, so simply asserting a 1 or 0 on the DATA+/- line
> at the controller won't accomplish anything in the end.

   The USB 2.0 spec requires hubs (and host controllers, and
   high-speed-capable devices) to support a test mode that
   generates a high-speed "J" state (D+ high, D- low) and another
   that generates a high-speed "K" state (D+ low, D- high).

   You could presumably use those test modes to bit-bang signals on
   the D+ and D- pins.

   -Andy

   P.S.  Why does this have a [PIC:] tag?

=== Andrew Warren -- RemoveMEaiwEraseMEspamEraseMEcypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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2004\08\17@170926 by Patrick J

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Amen to that!
And comming up... illegal to 'tamper' with your hardware! Geez
(I think its illegal in USA to modify your X-box or something?)

----- Original Message -----
From: "Russell McMahon"
> > > Is there any way to access the A end B data pins
> > > of a USB port? Just like we do with the printer port?

> Something in there knows how to. It's a sad day when a man no longer has
> access to his own hardware :-)
>         RM

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2004\08\17@172055 by Chetan Bhargava

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Couple of years back I did a USB / Parallel / I2C bridge. You can do
something like that.

Regards,

Chetan

On Tue, 17 Aug 2004 03:30:51 -0300, Octavio Nogueira
<EraseMEnogueiraspamspamspamBeGonetato.ind.br> wrote:
> Is there any way to access the A end B data pins
> of a USB port? Just like we do with the printer port?
>
> Regards,
>
> Octavio Nogueira
> Tato Equipamentos Eletrônicos Ltda
> (11) 5506-5335

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