----- Original Message ----- 
From: "Olin Lathrop"
To: "Microcontroller discussion list - Public."
Sent: Friday, May 20, 2005 1:44 PM
Subject: Re: [PIC] re: USB Driver


> John Piccirillo wrote:
> >   True the PS+ doesn't have a USB port but my, and most, laptops do
> > so I use a USB to Serial adapter (Keyspan).  I think Microchip
> > recognizes this situation.   Surely I'm not the only one trying to
> > communicate to a PicStart+ from a laptop that only has USB serial.  How
> > is it done ?
>
> If the USB to serial adapter is working properly, then it should just
work.
> You will of course have to tell MPLAB with COM port to use.

Yes if it works :) I haven't used MPLAB with the serial adapter I have,
cause I don't do much debugging with the laptop but, when it works you plug
it in and it gets detected and becomes a new com port. The next problem is
that if the software can see com ports higher than 4. I think winXP is ok,
but versions before wouldn't allow this. So you have to set the com port
number below 4 for it to be seen. Some older software also only see the
first 4 com ports.

In my checks when I got the "Unknown USB", I have written drivers for USB in
the past, the PID and VID were being read back as 0000, so windows could not
detect it, when I plugged it into a powered hub, it just worked. I can only
assume the power to the adapter was not allowing the device in the adapter
to send the correct VID/PID.

Bryan



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