Linux/AM4378: Touchscreen calibration problem

Dear Nick,

I followed the link which you given below.

and i just deleted "ws-calibrate.rules"  files and rebooted the system as given below

rm /etc/udev/rules.d/ws-calibrate.rules
 rm /run/media/mmcblk0p1/ws-calibrate.rules
 reboot


I did not get any calibration screen at boot up which means i am not able to calibrate my touch screen.

After deleting "ws-calibrate.rules" from relevant location, As you said I manually relaunching Weston by issuing "/etc/init.d/weston start" . But I have not succeeded.

Is there any way to manually initiate calibration ?

Regards,
Winiston.P

Hello Winiston,

Testing an AM437x EVM running SDK 4.1:
The first time I booted I got the white screen with red crosses to calibrate the touchscreen.
I did
rm /etc/udev/rules.d/ws-calibrate.rules
rm /run/media/... did not find any additional ws-calibrate.rules on my particular board
reboot
at this point, I did get the white calibration screen with red crosses again, and I calibrated the touchscreen.

I could manually initiate calibration by doing
rm /etc/udev/rules.d/ws-calibrate.rules
/etc/init.d/weston start
at this point, I got the white calibration screen. After calibration, the screen remained black
reboot
When the board restarted, it did not give me a calibration screen, and behaved as expected.

Regards,
Nick

Dear Nick,

I have also followed the same way by removing "ws-calibrate.rules" by "rm /etc/udev/rules.d/ws-calibrate.rules" .

I rebooted again. But it did not ask any white calibration screen.

I have removed by  "rm /etc/udev/rules.d/ws-calibrate.rules" . and initiate weston by "/etc/init.d/weston start". But i did not get any calibration screen.

I have copied entire file system contents without "ws-calibrate.rules"  to one more sd card and used one more new touch screen controller. Then also I did not get any calibration screen.

We used egalaxy touch screen controller outside the board and connected via USB. Touch calibrated data may be stored on the touch screen controller. Is there any possibility, touch screen controller over ride the file system so that after deleting "ws-calibrate.rules" also, system does not go for calibrationmode.

Should i initiate or delete any file from any where in the file system to re-calibrate touch screen?

Regards,

Winiston.P

Dear Nick,

I am waiting for your reply..

Regards,
Winiston.P

Hello Winiston,

I apologize for the delay. Monday was a holiday in the US. TI cannot help you with eGalax's touch screen controller. If it is doing anything with the touch screen calibration, you would need to contact them for support.

I am asking around to see if anyone has additional ideas.

Regards,
Nick

Hello Winiston,

Is the touchscreen being detected?

Here's my output on AM437x GPEVM:
root@am437x-evm:~# ls /dev/input/
by-path event0 event1 mice mouse0 touchscreen0

but touchscreen0 would go away if I removed the touchscreen from the board.

Regards,
Nick

Hello Winiston,

Did you figure this out, or do you need additional support?

Regards,
Nick

Dear Nick,

I could not figure it out. Still problem persists. It detected as touch screen and it works but calibration is not good. So i want to calibrate my touch screen. The problem is, it does not go to calibration mode.

 As per TI wiki, i removed files from two places as given below.

 rm /etc/udev/rules.d/ws-calibrate.rules
 rm /run/media/mmcblk0p1/ws-calibrate.rules
 reboot

Still it does not go for calibration mode.
Egalax support says that it is related to your linux issue.

How do i enter into calibration mode? If you need more information, Let me know.

Regards,
Winiston.P

Hello Winiston,

Just letting you know I am trying to look at reasons it might not bring up calibration mode or how to enter it. No updates yet.

Regards,
Nick

Hello Winiston,

Please add some echo statements to the shell script "weston" under /etc/init.d so we can get some more information about how the script executes.

Regards,
Nick

Dear Nick,
I added script to weston. It executes properly and touch screen also works. But i could not calibrate the screen.
Still i am waiting for the solution.

Regards,
Winiston.P

Hello Winiston,

The weston script is in charge of calling the touchscreen calibration. See this part:

# Check if SD card has a calibration rules file
        SD_CALUDEV_FILE=/run/media/mmcblk0p1/ws-calibrate.rules
        if [ "$SD_MOUNTED" = "1" -a -f "$SD_CALUDEV_FILE" ] ; then
            # Copy it over to udev location
            cp "$SD_CALUDEV_FILE" "$WS_CALUDEV_FILE"
        else
            # Run a calibration app and save output to udev rules
            echo    "Calibrating touchscreen (first time only)"
            echo
            echo    "*** To continue, please complete the touchscreen calibration"
            echo -n "*** by touching the crosshairs on the LCD screen"
            sleep 1
            CAL_VALUES=`weston-calibrator|cut -c21-`
            echo 'SUBSYSTEM=="input", ENV{WL_CALIBRATION}="'$CAL_VALUES'"' > $WS_CALUDEV_FILE
            echo "."
            # Copy it back to SD
            if [ "$SD_MOUNTED" = "1" ] ; then
                cp "$WS_CALUDEV_FILE" "$SD_CALUDEV_FILE"
            fi
        fi

Please insert some additional "echo" statements to this part of the script (e.g., in each part of the if/else statement) so we can see whether the calibration command is being executed as expected. Feel free to add echo statements to other parts of the script you are curious about if you think they might be related to your issue.

Regards,

Nick

Dear Nick,

My touch screen is not detected as "touchscreen0 " under /dev/input. when i connect touchscreen, it detect as "event0" . But it takes around 6 sec to show as "event0" after it boots.

My weston content as given below.

#!/bin/sh
#
### BEGIN INIT INFO
# Provides: weston
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
### END INIT INFO

killproc() {
pid=`/bin/pidof $1`
[ "$pid" != "" ] && kill $pid
}

read CMDLINE < /proc/cmdline
for x in $CMDLINE; do
case $x in
weston=false)
echo "Weston disabled"
exit 0;
;;
esac
done

case "$1" in
start)
. /etc/profile
sleep 2

# Weston for some reason dies if these environment variables are set
unset WAYLAND_DISPLAY

# This is all a nasty hack
if test -z "$XDG_RUNTIME_DIR"; then
export XDG_RUNTIME_DIR=/run/user/root
fi

if [ ! -d "$XDG_RUNTIME_DIR" ] ; then
mkdir --parents $XDG_RUNTIME_DIR
chmod 0700 $XDG_RUNTIME_DIR
fi

openvt -c 4 -f runWeston

# If there's no touchscreen device available, done
if [ ! -e /dev/input/touchscreen0 ] ; then
exit 0
fi

# If it was already calibrated, done
if [ -f "$WS_CALUDEV_FILE" ] ; then
exit 0
fi

# Check if SD card is mounted
mount | grep /run/media/mmcblk0p1 | grep vfat > /dev/null 2>&1
if [ "$?" = "0" ] ; then
SD_MOUNTED="1"
else
SD_MOUNTED="0"
fi

# Check if SD card has a calibration rules file
SD_CALUDEV_FILE=/run/media/mmcblk0p1/ws-calibrate.rules
if [ "$SD_MOUNTED" = "1" -a -f "$SD_CALUDEV_FILE" ] ; then
# Copy it over to udev location
cp "$SD_CALUDEV_FILE" "$WS_CALUDEV_FILE"
else
# Run a calibration app and save output to udev rules
echo "Calibrating touchscreen (first time only)"
echo
echo "*** To continue, please complete the touchscreen calibration"
echo -n "*** by touching the crosshairs on the LCD screen"
sleep 1
CAL_VALUES=`weston-calibrator|cut -c21-`
echo 'SUBSYSTEM=="input", ENV{WL_CALIBRATION}="'$CAL_VALUES'"' > $WS_CALUDEV_FILE
echo "."
# Copy it back to SD
if [ "$SD_MOUNTED" = "1" ] ; then
cp "$WS_CALUDEV_FILE" "$SD_CALUDEV_FILE"
fi
fi

# Reload and re-run udev rules and restart weston
udevadm control --reload
udevadm trigger
killproc weston
sleep 2
openvt -c 4 -f runWeston
;;

stop)
echo "Stopping Weston"
killproc weston
;;

restart)
$0 stop
sleep 2
$0 start
;;

*)
echo "usage: $0 { start | stop | restart }"
;;
esac

exit 0

Is there any mistake in my weston (/etc/init.d/weston)file ? I tried to run "weston-calibrator" manually. But it does not save calibrated data. 

Alternatively, Is it possible to run "weston-calibrator" manually and save it?

Regards,

Winiston

Hey,

You can refer the below article to calibrate your touch screen

processors.wiki.ti.com/index.php/How_to_Recalibrate_the_Touchscreen

Regards,

Adrian Gates

System Admin - CloudDesktopOnline

Dear Nick,

As you said, touchscreen0 does not exist. I added echo command in each function of weston script and found the root cause.

I commented out touchscreen0 checking lines in the wseton script. Now it started working.

Thanks for your extreme help.

Regards,

Winiston.P