On 10/17/06, [email protected] <[email protected]> wrote:
I'm working on a prototype Hitachi tablet, it uses a Fujitsu 4-wire
resistive touchscreen. {10.4" I think}
I've found that windows-xp embedded uses a generic ps/2 driver for the
device.
I've ripped this thing to pieces on several occasions looking for chips
to help the porting, my problem is that I can not find the
analog-digital converter for this thing. The connector goes to a
surface mount header on an 8 layer board.
I loose the traces almost instantly. Given that I can't find the
converter anywhere what should I do next?
I've done my homework and found that this HAS to be either serial or usb
attached according to Fujitsu.
Aparently it's neither. There are no unknown USB devices {or known
matching}, and there is no activity on the single serial port on the
system. Since the windows driver uses PS/2 as the interface I have a
horrible feeling this thing has an interpretation layer that makes it a
PS/2 mouse, and that may or may not royally be a nightmare.
The touchscreen might need a "magic knock" to activate. You might try
to see what data wondows driver sends to PS/2 port.
Also check of Lifebook touchscreen protocol will work for you. You
will need to adjust DMI table in drivers/input/mouse/lifebook.c/
I would have posted this to a different group but there is no "input"
mailing list.
[email protected]
But you must be subscribed to post otherwise list just drops your
mails on the floor.
--
Dmitry
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