Re: [Libusb-win32-devel] USB to LPT

[Stephan M. <ste...@we...>]

Basically it should be possible to control these LPT-USB adapters
with libusb(-win32). All you need is a datasheet of the chip that's
used by the adapter and a specification of its high level protocol.

The problem is that all of these devices use different kind of controller
chips which are most likely not compatible. Supporting all of them by=20
your application will be hard if not impossible.

If I where you I would design a custum USB-to-DIO converter. This
will save you (and your customers) a lot of pain.

Have a look at the FTDI web site (http://ftdichip.com/), especially=20
at their FT245 product. This might be what you need.

Stephan


> Hi to all:
>=20
> My name is Mauricio and I new on the list, I write you from Chili.
>=20
> I have a very basic question so be patience with me please.
>=20
> I develop a domotic system for people with mobility problems=20
> (wheelchair, etc) (you can see more about the system in=20
> http://www.domosoft.cl in the "Galeria Multimedios" section). This=20
> system use some circuit conected to the PC in the LPT port, so to=20
> control the circuit my software use the "inpout32.dll" librarie, with=20
> this librarie I can write and read directly to the memory position of=20
> the LPT (data, status and control bytes)...and now this is my problem.=20
> Modern computer don't have LPT anymore and a quick way to conect my=20
> circuit is with a USB to LPT adapter, but with this kind of adapter the=20
> system have a "virtual lpt port", and I can't write directly in any=20
> memory position (this is correct right=3F=3F). So, I want to build some kind=
=20
> of "driver/library" to write in some kind of "usb memory" or access to=20
> the "virtual LPT port" usb adapter and write the numbers for the LPT. If=
=20
> this posible with libusb-win32=3F=3F, and also my adapter is recognized on=20
> linux and work with my printer, so is this posible for the linux version=
=20
> of libusb=3F=3F
>=20
> Thanks and sorry for the long explanation... :-)
>=20
>=20
>=20
> Mauricio
>=20
>=20
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