All of the information I've found related to PICs and USB deals with
building a perephrial device on a USB bus.  Is there any information
available for implementing a (very simple) PIC based USB host?  From what=
 I
understand USB hosts need quite a few system resources bacause the USB
drivers support a wide variety of devices.  What I'm interested in is jus=
t
building a "simple" host that supports a very limited number of device ty=
pes
(well only one really).  Basically, I've got a USB webcam, and I would li=
ke
to be able to grab a frame off of it and write it to an external memory
device.  I have to admit that I'm completely new to micro controllers and
USB so if this idea is way off base just let me know.
Thanks.
Jason.


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tony K=FCbek
Sent: 29. november 2002 9:30AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: USB peripherals for microcontroller


Hi,

Brendan Moran wrote:
>So, while looking for a usb micro, I came across another solution.
>National makes two USB peripherals with part numbers USBN9603
>(http://www.national.com/pf/US/USBN9603.html) and USBN9604
>(http://www.national.com/pf/US/USBN9604.html).
>They both contain the full requirements for connection at high speed to
the
>USB, the 9604 is for bus powered operation, and the 9603 is for self
>powered operation.  They both run off of  24MHz crystals.
>
>These are devices that connect much the way a memory would.  They
connect
>either in serial mode, via SPI, or in parallel mode, with an 8-bit bus.
>
>Looks to me like a simple solution for how to get a PIC onto USB.
>
>Of course writing the subsequent driver is another question entirely,
but
>it is an easy way to handle the hardware with primarily existing
components.

Well one's milage may wary depedning on the purpose of thew usb i/f but
for me I think the absolute best solution is to use one of the FTDI
chip's
then there's no need to worry about drivers rtc. ( they're included ).
Also fairly cheap ( <5$).

Look at: http://www.ftdichip.com/

Really awsome, serial (aka RS232) or parallel versions, protoboard etc.

Neat critters.

/Tony

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