Interfacing any touch screen with AT91RM9200

Hi all,
       Now we are in study phase in analyzing to identify the
microcontroller which is having in-build Ethernet port, memory
interface (say CF) and USB port. Now we chose AT91RM9200 tha is the one
which is having all these options. Could we interface any touch screen
display with this microcontroller? If yes, how we have to interface it.
My advance thanks to you.

with regards
marans

In comp.arch.embedded,
Tamilmaran S <tamilmaranz@gmail.com> wrote:
>Hi all,
>       Now we are in study phase in analyzing to identify the
>microcontroller which is having in-build Ethernet port, memory
>interface (say CF) and USB port. Now we chose AT91RM9200 tha is the one
>which is having all these options. Could we interface any touch screen
>display with this microcontroller? If yes, how we have to interface it.

Yes, you can interface to any touchscreen. How depends on the touchscreen.

I am using the AT91RM9200 with a resistive touchscreen and have a
touchscreen controller (Gunze AHL-71) on my board. This controller connects
to the CPU through a serial port. So all my software has to do is decode
the strings sent by the touchscreen controller.

-- 
Stef    (remove caps, dashes and .invalid from e-mail address to reply by mail)

The fashion wears out more apparel than the man.
		-- William Shakespeare, "Much Ado About Nothing"

"Tamilmaran S" <tamilmaranz@gmail.com> wrote in message 
news:1141815817.189497.323670@z34g2000cwc.googlegroups.com...
> Hi all,
>       Now we are in study phase in analyzing to identify the
> microcontroller which is having in-build Ethernet port, memory
> interface (say CF) and USB port. Now we chose AT91RM9200 tha is the one
> which is having all these options. Could we interface any touch screen
> display with this microcontroller? If yes, how we have to interface it.
> My advance thanks to you.
>

Your device doesn't have an ADC on board so you'll need extra parts to drive 
a resistive touch screen yourself. Don't even think about driving a 
capacitive screen yourself (in fact don't use capacitive screens anyway 
because they are temperamental and only any use if you are in a very harsh 
environment.)

Lot's of places make controllers to convert to serial, I've used 3M's with 
no problems and I've briefly tried the Hampshire Company Sharc 12 controller 
which seems to be very good. They also make ICs in various packages which 
are not very expensive. I bought my stuff through Review Displays 
(http://www.review-displays.co.uk/) and they've been pretty helpful 
especially during our capacitive screen debacle - long story. <weeps softly 
into keyboard>

Unless you are set in stone with your processor choice then the Sharp 79524 
meets all your needs and has a built in touch screen interface and LCD 
controller as well. The 7A404 is an ARM9 device, if you want the extra 
speed, which does the same thing. I'm currently using the 79524 and its own 
controller to drive my 3M 4-wire resistive screen and it works great. You 
have to work out your own drivers and calibration routines but Sharp do an 
excellent application note - 
http://document.sharpsma.com/files/tec_appnote_lh7xxxx_touch_screen.pdf - 
which is very good to read even if you don't use the Sharp device because it 
explains a lot about touch screens (well resistive ones anyway). 

>"Tamilmaran S" <tamilmaranz@gmail.com> wrote in message 
>news:1141815817.189497.323670@z34g2000cwc.googlegroups.com...
>> Hi all,
>>       Now we are in study phase in analyzing to identify the
>> microcontroller which is having in-build Ethernet port, memory
>> interface (say CF) and USB port. Now we chose AT91RM9200 tha is the
one
>> which is having all these options. Could we interface any touch screen
>> display with this microcontroller? If yes, how we have to interface
it.
>> My advance thanks to you.
>>
>
>Your device doesn't have an ADC on board so you'll need extra parts to
drive 
>a resistive touch screen yourself. Don't even think about driving a 
>capacitive screen yourself (in fact don't use capacitive screens anyway 
>because they are temperamental and only any use if you are in a very
harsh 
>environment.)
>
>Lot's of places make controllers to convert to serial, I've used 3M's
with 
>no problems and I've briefly tried the Hampshire Company Sharc 12
controller 
>which seems to be very good. They also make ICs in various packages which

>are not very expensive. I bought my stuff through Review Displays 
>(http://www.review-displays.co.uk/) and they've been pretty helpful 
>especially during our capacitive screen debacle - long story. <weeps
softly 
>into keyboard>
>
>Unless you are set in stone with your processor choice then the Sharp
79524 
>meets all your needs and has a built in touch screen interface and LCD 
>controller as well. The 7A404 is an ARM9 device, if you want the extra 
>speed, which does the same thing. I'm currently using the 79524 and its
own 
>controller to drive my 3M 4-wire resistive screen and it works great. You

>have to work out your own drivers and calibration routines but Sharp do
an 
>excellent application note - 
>http://document.sharpsma.com/files/tec_appnote_lh7xxxx_touch_screen.pdf -

>which is very good to read even if you don't use the Sharp device because
it 
>explains a lot about touch screens (well resistive ones anyway). 
>
>
>
A very good architecture is the EP9315, you have all you need with an IDE
interface. Aother model is available: EP9312.  Those intgrate also a
matrix keyboard driver (8*8) and the evaluation board includes what you
need.