This Microsoft optical mouse is not sold in a serial version (it may
require too much power) but on closer examination it does come with a
PS/2 adapter.  The adapter seems to be a mechanical fitting with two
4.7k pull up resistors.  There is no sign of any "smarts" in the
adapter.  Somehow the mouse's USB chip must sense the adapter and switch
to a PS/2 mode.  This is looking promising again!

Sherpa Doug

> -----Original Message-----
> From: Niklas Wennerstrand [mailto:niklas.wennerstrand@TELIA.COM]
> Sent: Thursday, June 14, 2001 4:05 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: PIC as USB Master?
>=20
>=20
> OK, you probably have a very good reason to use the USB=20
> mouse. If not, I
> would use an ordinary mouse. I know that much of USB after=20
> reading some
> books about it that I wont use it unless I had a project that did not
> absolutely need it. Maybe you can do some reverse engineering=20
> on the vendor
> number and other stuff in the USB mouse and find away around=20
> a complete
> master but I still would go for an ordinary mouse. But maybe=20
> you just want
> to have it as a project to play and learn with and then I=20
> wish you good
> luck.
> Niklas Wennerstrand
>=20
> -----Ursprungligt meddelande-----
> Fr=E5n: pic microcontroller discussion list=20
> [mailto:PICLIST@MITVMA.MIT.EDU]
> F=F6r Douglas Butler
> Skickat:        den 14 juni 2001 20:25
> Till:   PICLIST@MITVMA.MIT.EDU
> =C4mne: Re: [PIC]: PIC as USB Master?
>=20
> In my case I don't need it to be a general purpose USB=20
> master.  It only
> has to handle one specific type of mouse.  I was thinking I could skip
> all of the enumeration and identification stuff.  If anything=20
> other than
> that model of mouse is attached it can send a fatal error message and
> halt.
>=20
> Douglas Butler (aka Sherpa Doug)
> Senior Engineer
> Imetrix Inc.
> 1235 Route 28A
> P.O. Box 152
> Cataumet, MA 02534-0152
> tel. (508) 564-6460
> Fax (508) 564-6860
> dbutler@imetrix.com
>=20
> > -----Original Message-----
> > From: Niklas Wennerstrand [mailto:niklas.wennerstrand@TELIA.COM]
> > Sent: Thursday, June 14, 2001 2:01 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [PIC]: PIC as USB Master?
> >
> >
> > I'm not a USB guru but my guess is that's impossible to make
> > a PIC a USB
> > master.
> > I base that guess on that the USB protocol is not a walk in
> > the park and its
> > developed by guys like Microsoft. If it was easy I guess that
> > USB support
> > under Linux would have been developed much faster than it
> > have. My guess is
> > that it require a lot off code and memory (That is not a
> > problem with todays
> > PC). As Linux is open source you might take a look on how its
> > done in Linux.
> > My guess is that you will see a lot of code and realise that
> > that will never
> > fit a PICmicro. USB is a standard and to conform to that
> > standard requires
> > that you have the full support and do not strip it. If you
> > could strip it
> > then it would not be USB.
> > Niklas Wennerstrand
> >
> >
> > -----Ursprungligt meddelande-----
> > Fr=E5n: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]
> > F=F6r Douglas Butler
> > Skickat:        den 14 juni 2001 15:13
> > Till:   PICLIST@MITVMA.MIT.EDU
> > =C4mne: [PIC]: PIC as USB Master?
> >
> > I would like to connect one or two USB optical mice to a PIC
> > (or Cypress
> > if necessary) microcontroller for a motion digitizer project
> > with no PC
> > involved.  I can find very little info on how the write code
> > for the USB
> > master.  Minimal mouse function and usual mouse data rates are fine.
> >
> > Can anyone help?
> >
> > Douglas Butler
> > Senior Engineer
> > Imetrix Inc.
> > 1235 Route 28A
> > P.O. Box 152
> > Cataumet, MA 02534-0152
> > tel. (508) 564-6460
> > Fax (508) 564-6860
> > dbutler@imetrix.com
> >
> > --
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> >
>=20
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>=20
>=20

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