nanogui: Thread: Touchscreen & Linux 2.6.24+ kernels

Hi

With Linux, nano-x seems to use a deprecated method for interacting with the 
touchscreen (it uses the "tsdev" driver, which was marked for removal during 
the 2.6.21 cycle.

http://www.cslimits.net/kernel-2.6.21_docs/feature-removal-schedule.txt

Is there any effort underway to move to the userspace tslib library? (which is 
supported?)

> Is there any effort underway to move to the userspace tslib library? 
(which is supported?)

Robin -

It appears few are interested in the userspace tslib issue you've raised.
Did you ever try porting this?  If you do, I'd be happy to add it to the
current CVS.

Regards,

Greg

Sorry that I intended to send this mail to the list (I'd send the same mail
again):

Jonathan Kotta made a tslib touchscreen patch for nano-X here:
http://download.analog.com/27516/forummessage/4/2/5/4254/microwin.patch
(The full thread is here:
http://blackfin.uclinux.org/gf/project/uclinux-dist/forum/?action=ForumBrowse&forum_id=39&_forum_action=ForumMessageBrowse&thread_id=26343
).

I tested wich nano-X 0.91 and it works.
-Yi

On Wed, Mar 26, 2008 at 4:29 AM, Greg Haerr ####@####.#### wrote:

> > Is there any effort underway to move to the userspace tslib library?
> (which is supported?)
>
> Robin -
>
> It appears few are interested in the userspace tslib issue you've raised.
> Did you ever try porting this?  If you do, I'd be happy to add it to the
> current CVS.
>
> Regards,
>
> Greg
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ####@####.####
> For additional commands, e-mail: ####@####.####
>
>

Greg,

Jonathan mentions "
By "slow" I mean there is a lot of latency.  The cursor can move fast; the
cursor moves straight to anywhere I touch.  But there is a noticable delay
between touching and cursor movement.  If I drag the stylus across the
screen, the cursor is a few mm behind. "

I saw the same behavior using tslib.

Using TSLIB there will be a cursor (I think tslib draws the cursor), while
using the old interface, there is not such cursor. So I cannot compare the
two.

However, one problem using this patch is that, using "top" I saw nano-x
using 99% of CPU, So it looks there is some issue with this patch.

-Yi


On Sat, Mar 29, 2008 at 7:36 AM, Greg Haerr ####@####.#### wrote:

>
>
> > I tested wich nano-X 0.91 and it works.
> Jonathan reported some latency between touching the screen and updating
> the cursor.  Do you have this problem as well?
>
> Regards,
>
> Greg
>
>

Luckily the CPU load issue cannot be observed now (It looks like an issue
specific to certain board). So I think this patch works well.
-Yi

On Wed, Apr 2, 2008 at 3:03 PM, yi li ####@####.#### wrote:

>
> However, one problem using this patch is that, using "top" I saw nano-x
> using 99% of CPU, So it looks there is some issue with this patch.
>
> -Yi
>
>
>
> On Sat, Mar 29, 2008 at 7:36 AM, Greg Haerr ####@####.#### wrote:
>
> >
> >
> > > I tested wich nano-X 0.91 and it works.
> > Jonathan reported some latency between touching the screen and updating
> > the cursor.  Do you have this problem as well?
> >
> > Regards,
> >
> > Greg
> >
> >
>