I haven't worked with touch screens for a while, but generally the
protocols are inanely simple. Something along the lines of 4 quartets:
X, Y, Pressure, <something else>

Ack.. it has been a little too long. Anyways, the hardest part of the
whole exercise is to get the calibration and jitter control working. The
actual input of the data itself is pretty trivial. The other two can
probably be ripped off someone else's drives. I used the touch screen
drivers in Kdrive, so that may be a place for you to start looking for
working examples. 


-----Original Message-----
From: Bodo Bimboese [mailto:[EMAIL PROTECTED] 
Sent: Friday, September 12, 2003 4:49 AM
To: [EMAIL PROTECTED]
Subject: Touchscreen input driver

Hello All,

Please apologize if this request is wrongly placed. I'm not familiar
with programming, just a keen user. I'd be thankful, if anybody could
point me into the right direction.

I'm using X (4.3.0) on Linux, and I'm struggling to get a touchscreen
(-input) device to work. It's not one of those popular manufacturers
whose driver is included with 4.3.0

Things I've found out yet:
manufacturer of the 12" TFT monitor with touchscreen is a no-name
Asia-based. The interface is RS-232 with 9-pin serial connector and a
PS/2 dongle-style plug (the mouse plugs into the back of this plug).
Touchpanel manufacturer is a company called Hantouch
Serial driver PCB manufacturer is a company called Sena
(both companies offer downloads, but I didn't found any for X)
The monitor is marketed under the label Glancetron in Europe
(They only offer Win drivers unfortunately)

Since I haven't found any *nix drivers on the net, I've tested all input
drivers which came with X.
None of the touchscreen drivers work, some cause X to abort.
The only reaction I get is from the DigitalEdge tablet driver, which
causes a 'click' in the bottom right corner of the screen, no matter on
which area I touch it.

My question is:
Would it be an easy task to modify an existing driver to get the touch
element to work?
I've had a look at the Elotouch driver sources, and it doesn't look
huge. I have no idea about programming, but I'm motivated to take the
challenge.

cheers, Bodo
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