Philips and Dallas Semi make USB chips with standard serial\parallel
interfaces. You have to deal with some USB stuff but it's not that =
hard. If
you want more flexibility than simply a comm port (you could implement =
the
comm port Device Class (but you don't have to). The dallas chip is =
USB->1
wire, I haven't looked at it much and I believe it is still in
pre-production. Philips have the PDIUSBD11 which is a USB I\F with I2C
serial. It has some good features such as supporting full speed USB =
(there
are various features which can only be implemented in full speed =
devices).
The I2C interface is 1MHz, which IIRC gave about 500KByte\s actual data
throughput.

There is also a version of the Philips USB chip with a parallel (DMA
compliant) interface.

The parallel I\F version is only available in SMD packages (SOIC and =
SSOP I
believe) while the serial I\F is available in DIP.

They also have a USB 2.0 parallel I\F chip in development.

Tom.

-----Original Message-----
From: K=FCbek Tony [mailto:tony.kubek@FLINTAB.COM]
Sent: Saturday, December 16, 2000 4:29 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]:How to link PIC-to-PC using USB?


Hi,

Olin Lathrop wrote:
>USB is *much* more heavyweight than RS-232.  Microchip has two PICs
with USB
>capability built in, and also has a stand alone USB chip.  However,
there is
>still considerable software on both ends to implement a USB =
connection.
<snip>

Well true for legacy support, however as Andy wrote you have the FTDI
chip's.
They are truly the only ( as far as I know ) plug&play solution for
adding
USB support to any device previously using ASYNCH comms.
I.e for thoose who apperently doesn't bother actually looking at the
sites
suggested by contributors thse are a quick run-down on the FTDI chips:

USB spec. 1.1=20
Plug in as UART
Uses USB as trasportation media.
EEram option to add serial (id) and other USB specific data.
Virtual comm Driver for win95/98, 2000, Apple and linux pending.

**i.e application thinks it's a comms port, pic thinks it's a comms =
port
**
 No 'usb' specific s/w in pic, no 'usb' specific s/w in host ( apart
from driver ).

Cost: a few dollars :) ( 2-3 i think )

/Tony


Tony K=FCbek, Flintab AB           =20
=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=
=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=
=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2
E-mail: tony.kubek@flintab.com
=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=
=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=
=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2=B2

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu