Which is a great tutorial for how to talk to and use a standard PSIX
serial device.
Jim
On Jan 28, 2004, at 9:56 AM, Barry Twycross wrote:
At 10:23 +0100 1/28/04, Cedric Vuillet wrote:
I received a Wacom serial graphical tablet and a Keyspan usb to
serial adaptor. Now, I must develop a driver for the tablet.
I tried to search for a usb interface of the keyspan adaptor and I
found one with two alternate settings. There are a many bulk and
isochronous pipes and one interrupt pipe. I tried to read on bulk in
pipes but I've got an error saying that there is no async port.
Do you think tablet use the interupt pipe or a bulk pipe?
I downloaded keyspan driver and intalled it but I don't understand
what is the aim of this driver... What does the driver do? Must I
pass through it? What can I do with this driver? Do I need this
driver to develop the Wacom driver?
Must I speak with USB interface directly or must I speak with Keyspan
driver and make a serial driver?
The way I'd do this is to use the Keyspan serial adapter driver to do
whatever it does and just talk to the tablet as if it were a serial
tablet (which it is).
I don't think replicating Keyspan's work is at all sensible, or really
relevant to the problem at hand.
The Keyspan serial driver provides a standard interface to a serial
port, just like any other serial port. Any application which expect to
talk to a serial port should be able to talk to a device attached via
it and should remain blissfully unaware that USB is involved at all.
You really need to be investigation serial comms. Not something I know
a great deal about in OS X, I do know that the adapter pops up as a
/dev/cu.* device. (Possibly in addition to anything OS X specific.) If
you program to the serial APIs you should find it'll work whether the
tablet is attached via the adapter or via a real serial port (such as
found on a Blue and White G3, or by the use of third party hardware).
--
Barry Twycross
email@hidden
---
USB, it's not a Dyslexic BUS. (Thanks to TC.)
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