In my case I don't need it to be a general purpose USB 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 other than
that model of mouse is attached it can send a fatal error message and
halt.

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

> -----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?
>=20
>=20
> I'm not a USB guru but my guess is that's impossible to make=20
> a PIC a USB
> master.
> I base that guess on that the USB protocol is not a walk in=20
> the park and its
> developed by guys like Microsoft. If it was easy I guess that=20
> USB support
> under Linux would have been developed much faster than it=20
> have. My guess is
> that it require a lot off code and memory (That is not a=20
> problem with todays
> PC). As Linux is open source you might take a look on how its=20
> done in Linux.
> My guess is that you will see a lot of code and realise that=20
> that will never
> fit a PICmicro. USB is a standard and to conform to that=20
> standard requires
> that you have the full support and do not strip it. If you=20
> could strip it
> then it would not be USB.
> Niklas Wennerstrand
>=20
>=20
> -----Ursprungligt meddelande-----
> Fr=E5n: pic microcontroller discussion list=20
> [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?
>=20
> I would like to connect one or two USB optical mice to a PIC=20
> (or Cypress
> if necessary) microcontroller for a motion digitizer project=20
> with no PC
> involved.  I can find very little info on how the write code=20
> for the USB
> master.  Minimal mouse function and usual mouse data rates are fine.
>=20
> Can anyone help?
>=20
> 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
>=20
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>=20
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>=20
>=20

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