nanogui: Thread: touchscreen calibration

Hi all,

I am desperately hoping that someone can help me with this problem..

I am trying to get my touchscreen calibrated in Nano-X.  I am using an ADS
graphicsmaster platform (strongarm cpu, 640 x 480 lcd with touchscreen)
along with microwindows 0.89pre8.

I have tried using/modifying tpcal which is a contrib in the microwindows
package, but I can't figure out how to use the 7 numbers it outputs.

I also tried using nxcal which comes with the Pixil OE package, but the
program doesn't respond to any touchscreen inputs for some reason.  It
simply draws the first screen asking to press the crosshairs, but doesn't do
anything past that.

I found out how to enter calibration data as follows:
{
  int fd = open("/dev/ts", O_RDWR);
  int xmin, ymin, xmax, ymax;

  ioctl(fd, 10, xmin);
  ioctl(fd, 11, ymin);
  ioctl(fd, 3, xmax);
  ioctl(fd, 4, ymax);
}

But for the life of me cannot figure out how to get the proper values for
xmin, ymin, xmax, and ymax.

Does anybody have a calibration program that is functional, or any helpful
tips on how to fix this problem?

Greg Haerr, I noticed from the archives that you mentioned something about
Century Software releasing a touchscreen calibrator for Microwindows.  Has
one actually been released?

Any help would be greatly appreciated.  Thanks!

Cheers,
//Henry Chea
Semcon Sweden AB

Henry Chea wrote:
> I am trying to get my touchscreen calibrated in Nano-X.  I am using an ADS
> graphicsmaster platform (strongarm cpu, 640 x 480 lcd with touchscreen)
> along with microwindows 0.89pre8.

Hi Henry. Jordan and I have written a new touchscreen driver for the 
UCB1x00 touchscreen interface in recent kernels, and I've created a new 
client side touchscreen calibration interface and calibration program.

Please try it out on your hardware and let me know if it works for you. 
You can get it from a recent snapshot of my current tree from:
http://www.linuxhacker.org/pub/cvs-snapshots/microwin-aph/

Select UCB1X00MOUSE=Y in the config file and uncomment the lines in 
launcher.cnf which say "$startup bin/nxcal" and "Recalibrate - bin/nxcal 
-c". The touchscreen device file should be called /dev/ucb1x00-ts and be 
a character device with major 10 and minor 14. The user the calibration 
program runs as should have permission to read and write a file called 
/etc/nxcal.cal (you can create the file as root and then chown it to the 
user you run Microwindows as).

I'd also be particularly interested to hear how well the jitter 
filtering works for you as I spent quite a bit of time getting a 
solution that works well on the TuxScreen, but don't have any other 
ucb1200 based machines to test it with.

I'm hoping that people with access to the suitable hardware will port 
the other touchscreen drivers to the new calibration API so they can all 
benefit from the new client calibration program.

PS. I finished implementing shaped windows yesterday and wrote a clone 
of Xeyes. It should be in the latest snapshot.

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

At 17:46 09/03/2002 +0000, you wrote:
>PS. I finished implementing shaped windows yesterday and wrote a clone of 
>Xeyes. It should be in the latest snapshot.

Cool!! Does this mean you've done transparent pixmap drawing too...?

Julian
========================================================================
Julian Smart              ####@####.####
3 Water Street            http://www.anthemion.co.uk
Stamford, Lincs           +44 (0)1780 765976
U.K. PE9 2NJ
========================================================================

Julian Smart wrote:
> Cool!! Does this mean you've done transparent pixmap drawing too...?

Not yet but I am working on it...

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

Hi Alex,

I was able to compile Nano-X and nxcal according to your instructions.
However, things don't quite work yet.

The platform I am using is the ADS Graphicsmaster using an SA1110 cpu.

The problem seems that the modified nano-X server does not work with my
touchscreen/driver properly.

Your instructions require /dev/ucb1x00-ts be a character device with major
10 and minor 14, which does not point to the touchscreen on my hardware.
When I tried running nano-X with ucb1x00-ts set to major 10 and minor 14, I
get the following error:

----------------------------------
Error 19 opening touch panel
Cannot initialise mouse
[1]+  Exit 1                  ./nano-X
Not all parameters were present in the calibration file /etc/nxcal.cal
Couldn't connect to Nano-X server
----------------------------------

For my hardware, the touchscreen is major 11 minor 0.

After running the command "mknod ucb1x00-ts c 11 0", I tried running the
nano-X server again.  This time nano-X does not quit prematurely.  However
any touchscreen inputs return the following error:

----------------------------------
Wrong number of bytes 6 read from touch panel (expected 16)
----------------------------------

That is understandable since the touchscreen driver I need to use for my
hardware is mou_ads, not mou_ucb1x00 .  After recompiling nano-X to use
mou_ads instead, the new nano-X server runs fine, and the nxcal program runs
without error.  However, after the nxcal program gets its four calibration
points, it fails to actually calibrate my touchscreen.  IOW, nxcal believes
that it calibrated my touchscreen fine but no actual changes are made.

This leads me to believe that the mou_ads driver for my hardware needs to be
rewritten to take advantage of the new calibration functions.  Unfortunately
I am not skilled enough to do this!

Any ideas or help?

Cheers,
//Henry Chea
Semcon Sweden AB 

-----Original Message-----
From: Alex Holden
To: Henry Chea
Cc: ####@####.####
Sent: 3/9/2002 6:46 PM
Subject: Re: [nanogui] touchscreen calibration

Henry Chea wrote:
> I am trying to get my touchscreen calibrated in Nano-X.  I am using an
ADS
> graphicsmaster platform (strongarm cpu, 640 x 480 lcd with
touchscreen)
> along with microwindows 0.89pre8.

Hi Henry. Jordan and I have written a new touchscreen driver for the 
UCB1x00 touchscreen interface in recent kernels, and I've created a new 
client side touchscreen calibration interface and calibration program.

Please try it out on your hardware and let me know if it works for you. 
You can get it from a recent snapshot of my current tree from:
http://www.linuxhacker.org/pub/cvs-snapshots/microwin-aph/

Select UCB1X00MOUSE=Y in the config file and uncomment the lines in 
launcher.cnf which say "$startup bin/nxcal" and "Recalibrate - bin/nxcal

-c". The touchscreen device file should be called /dev/ucb1x00-ts and be

a character device with major 10 and minor 14. The user the calibration 
program runs as should have permission to read and write a file called 
/etc/nxcal.cal (you can create the file as root and then chown it to the

user you run Microwindows as).

I'd also be particularly interested to hear how well the jitter 
filtering works for you as I spent quite a bit of time getting a 
solution that works well on the TuxScreen, but don't have any other 
ucb1200 based machines to test it with.

I'm hoping that people with access to the suitable hardware will port 
the other touchscreen drivers to the new calibration API so they can all

benefit from the new client calibration program.

PS. I finished implementing shaped windows yesterday and wrote a clone 
of Xeyes. It should be in the latest snapshot.

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

If I remember correctly I think you find that the nxcal application outputs
the values for calibration to the STDOUT, these will need to be redirected 
into the calibration file for the touchscreen driver (/etc/tpcal??).

At least I believe that's how it work(ed/s) on my Mips palmtop.

Simon

-----Original Message-----
From: Henry Chea ####@####.####
Sent: Monday, March 11, 2002 2:15 PM
To: ####@####.####
Subject: RE: [nanogui] touchscreen calibration


That is understandable since the touchscreen driver I need to use for my
hardware is mou_ads, not mou_ucb1x00 .  After recompiling nano-X to use
mou_ads instead, the new nano-X server runs fine, and the nxcal program runs
without error.  However, after the nxcal program gets its four calibration
points, it fails to actually calibrate my touchscreen.  IOW, nxcal believes
that it calibrated my touchscreen fine but no actual changes are made.

Henry Chea wrote:
> The problem seems that the modified nano-X server does not work with my
> touchscreen/driver properly.

I thought the ADS Graphicsmaster used a ucb1200 based touchscreen 
interface? That's what linux/Documentation/arm/SA1100/GraphicsMaster 
says. Or are you running an old kernel that doesn't have the new ucb1x00 
interface perhaps?

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

Simon Wood wrote:
> If I remember correctly I think you find that the nxcal application outputs
> the values for calibration to the STDOUT, these will need to be redirected 
> into the calibration file for the touchscreen driver (/etc/tpcal??).

Sorry, this confusion is due to my not realising there was already a 
progam called nxcal when I wrote my new Nano-X calibrator program. I'll 
change the name.

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

I'll bet Simon means tpcal: microwin/src/contrib/GPL/tpcal

nxcal works for me - its a good name, to the point, and similar to all
the other nx utilities.

Jordan

On Mon, 2002-03-11 at 08:45, Alex Holden wrote:
> Simon Wood wrote:
> > If I remember correctly I think you find that the nxcal application outputs
> > the values for calibration to the STDOUT, these will need to be redirected 
> > into the calibration file for the touchscreen driver (/etc/tpcal??).
> 
> Sorry, this confusion is due to my not realising there was already a 
> progam called nxcal when I wrote my new Nano-X calibrator program. I'll 
> change the name.
> 
> -- 
> ------------ Alex Holden - http://www.linuxhacker.org ------------
> If it doesn't work, you're not hitting it with a big enough hammer
> 

I think that I might be more confused.... I'm thinking of the tpcal 
application in the 'src/contrib' directory.

Apologies for any confusion,
Simon Wood

-----Original Message-----
From: Alex Holden ####@####.####
Sent: Monday, March 11, 2002 3:46 PM
To: Simon Wood
Cc: ####@####.####
Subject: Re: [nanogui] touchscreen calibration


Simon Wood wrote:
> If I remember correctly I think you find that the nxcal application outputs
> the values for calibration to the STDOUT, these will need to be redirected 
> into the calibration file for the touchscreen driver (/etc/tpcal??).

Sorry, this confusion is due to my not realising there was already a 
progam called nxcal when I wrote my new Nano-X calibrator program. I'll 
change the name.

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer