-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of Ozan Perincek
 Subject: Re: [PIC]: 16C745 / 65

It seems like Microchip has done all the hard work on the PIC side,

They have.  It's a pretty nice piece of work too.

but what about the PC side. Are there any USB host drivers available or do
we have to
write our own.

No.  You don't need or want to write your own drivers ;=)

Microsoft supplies all the standard drivers.  The standard MS drivers should
suffice for 99% of the products that would use a low speed USB device.  If
you need something really special you could write a driver, but for the life
of me I'm not sure why you would do it.

At the application level, talking to a USB device looks like :

MyHandle = CreateFile (MyDeviceName, ...)               // Get a handle to your device

WriteFile (MyHandle, ...)                               // Do this to send data to it

ReadFile (MyHandle,  ...}                               // Do this to read from it

CloseHandle (MyHandle)                  // When you're done, say goodbye to it

It's a little more complex than shown of course, but not much.  It's really
pretty simple.  Doable easily in VB or C.

Marc Reinig
System Solutions


>I have spent the last 2 hours reading mail about the above mentioned PIC
> and other ways of getting PIC to support USB. The only sample code I have
> found is the one provided in the data sheet at Microchips web site. If
> someone can answer any of the below questions, it would be much
> appreciated.

> 1) Are these chips in production yet or still samples?

The Web site gives the status as production.

2) Are there any other sample codes around? Is there an application note
> somewhere?

I've got some I'll pull together.

> The data sheet mentioned that "the enumeration process occurs
> in the background, via an ISR". I am assuming that we don't have to write
> this ISR ourselves... but this seems to easy.

It is, just use the Chapter 9 and optionally the HID Class code that
Microchip supplies.  Don't mess with it unless you really know USB.  It will
indeed work in the background, just call the few routines necessary but
don't modify the code.

> 3) Is it a better alternative to getting a standard PIC with external USB
> hardware?  If not, is the chip PDIUSBD11 provided by Philips still a good
> one?

The integrated USB feature on a PIC is nice if you need a low speed device.
I.e., would a 9600 baud full duplex serial port satisfy your speed
requirements for your project?  If the answer is yes, then the 765/745 are
great.  If the answer is no then the answer might be to use an external
device.  Whether the Philips device is the one depends on your speed and
other requirements.

Marc Reinig
System Solutions

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