Touchscreen support on IMX6 Evaluation Kit

SumitVaidya · ‎06-28-2012

Hi,

I bought IMX6 evaluation kit from Freescale. The package has 7" PRGB 800x480 IMX6QSB Development kit (LCD + resistive touch screen).

The LCD display work fine out of box. I need to compile kernel 3.0.15 to add touch screen support.

I tried with TSC2007 and egalax but not able to make it work. I am checking to see touch events under "/dev/input/event0".

Can you point me to some startup documentation?

Thanks.

Regards,

Sumit

jigarchokshi · ‎01-30-2014

Hie Sumit,

I have a Nit6x touch screen from boundary device.

http://boundarydevices.com/products/7-800x480-display/

I installed the TSC2004 touch screen driver

I installed Linux 3.0.35 using LTIB.

kernel was built successfully. and i copied uIamage to my sd card. i am using Imx6q board.

Now i dont know how can i check whether installed driver is working correctly or not?

Thank you,

Jigar Chokshi

sreekanthpk · ‎02-05-2016

hi,

' anybody used yocto insted of ltib? I need to do the interface of 7" tft display with he imx6q sabrelite. I am using yocto in ubuntu 14.04.Please give some sample programs to detect a touch screen

sonic7676 · ‎07-24-2017

hi, can you help to share you method to install ubuntu14.04 on the IMX6Q, thanks~~~

admin · ‎11-21-2012

could you please let me know, from where did you download the ltib to configure imx6 ?

I have the latest ltib but it only shows option for IMX21 IMX27 and IMX31. Where to get ltib to build IMX6 ?

Yuri · ‎11-21-2012

https://www.freescale.com/webapp/Download?colCode=L3.0.35_12.09.01_ER_SOURCE&appType=license&locatio...

https://www.freescale.com/webapp/Download?colCode=L3.0.35_12.09.01_UBUNTU_RFS&appType=license&locati...

SABRE Board for Smart Devices Based on the i.MX 6 Series Product Summary Page

prasannakarthik · ‎11-12-2012

Hi Sumit

We are trying to enable Okaya 7"1024 x 600 touch screen LCD with Nitrogen 6X IMx6 board.

How did you configure or select in the Device drivers in kernel for enabling lcd?

Did you add any specific driver.

On booting we get these kernel messages

mxc_sdc_fb mxc_sdc_fb.2: Unable to allocate framebuffer memory [ 6.552137] detected fb_set_par error, error code: -12 [ 6.559142] mxc_v4l2_output mxc_v4l2_output.0: ERR: fb_set_var. [ 6.561306] mxc_v4l2_output mxc_v4l2_output.0: ERR: fb_set_var.

LCD backlight is on and file system is mounted.

What specific changes do I need to make to kernel to enable Okaya display and solve frame buffer issue?

Thanks

karthik

SumitVaidya · ‎11-12-2012

Hi Karthik,

What is "bootargs" variable set to under u-boot? Do you see your touchscreen device getting registered under "/proc/bus/input/devices"?

Regards,

Sumit

prasannakarthik · ‎11-21-2012

Hi sumit

Thanks for reply

I get Penguins(linux logos) on screen .Am trying to port ARCHlinux

The LCD get registered.

echo "hello world" > /dev/fb0 gives data on screen.

after that cat /dev/fb0 gives junk pixel data

I doubt the Xserver is not running . FYI i have fb0-fb4 on dev

and the kernel menuconfig does not have kconfig(option) for setting frame buffer memory.

On which source file should I change the fbmemory size?Grepping kernel source got me mcfb.c has the line "Unable to allocate framebuffer memory"

What changes should I make to that?

Regards

karthik

SHould

MujjuHah · ‎08-06-2012

Hi Sumit, Thank you, it worked. Regards, Syed Mujeer Hashmi

SumitVaidya · ‎08-03-2012

Hi Syed,

In my case, function check_fd() from tslib library was failing for the following code. Hence I commented below chunk of code from check_fd().

#if 0
        if ((0 == test_bit(ABS_MT_POSITION_X, absbits)) ||
                 (0 == test_bit(ABS_MT_POSITION_Y, absbits)) ||
                 (0 == test_bit(ABS_MT_TOUCH_MAJOR, absbits))) {
                fprintf(stderr, "error: could not support the device\n");
                fprintf(stderr, "EV_SYN=%d\n", test_bit(EV_SYN, absbits));
                fprintf(stderr, "EV_ABS=%d\n", test_bit(EV_ABS, absbits));
                fprintf(stderr, "ABS_MT_POSITION_X=%d\n", test_bit(ABS_MT_POSITION_X, absbits));
                fprintf(stderr, "ABS_MT_POSITION_Y=%d\n", test_bit(ABS_MT_POSITION_Y, absbits));
                fprintf(stderr, "ABS_MT_TOUCH_MAJOR=%d\n", test_bit(ABS_MT_TOUCH_MAJOR, absbits));
                return -1;
        }
#endif

In startx file, make sure you are registering correct device name and event id. In my case, the symbolic link for device was not valid. So i changed the code to

"Xfbdev -nolisten tcp -mouse tslib,2,device=/dev/input/event0 -mouse mouse,2,device=/dev/input/mouse0 -keybd keyboard,,device=/dev/input/event1 &"

Also make sure you have correct path for file pointercal in this script.

To have touchscreen working, following environment variables are very important and should be set correctly.

export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_CONFFILE=/usr/etc/ts.conf
export TSLIB_PLUGINDIR=/usr/lib/ts
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_CONSOLEDEVICE=/dev/tty

This shows my platform settings and I set them in "etc/rc.d/init.d/fslgnome" file on root file system. You can set as per your setup or using "export" command.

Hope this helps.!!!

Regards,

Sumit

henridv · ‎02-20-2013

It's not necessary to comment this part out, which can be a bit cumbersome if you don't have direct access to the source code of the library.

What I did was configure the input_device as follows:

input_set_abs_params(input_dev, ABS_X, INPUT_MIN_X, INPUT_MAX_X, 0, 0);
input_set_abs_params(input_dev, ABS_Y, INPUT_MIN_Y, INPUT_MAX_Y, 0, 0);   
input_set_abs_params(input_dev, ABS_MT_POSITION_X, INPUT_MIN_X, INPUT_MAX_X, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y, INPUT_MIN_Y, INPUT_MAX_Y, 0, 0);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);

With this configuration, the code you commented out will not be executed, and the device will be recognized as a multitouch device. The maximum value of 255 is chosen arbitrarily, so if someone knows what the correct value is, let me know.

MujjuHah · ‎07-26-2012

Hi Sumit, I am facing the same issue. Can you eloborate your fix. So that it will help me. What exactly needs to be commented out from tslib-1.0 and what are startx changes. Appreciate your help. Thanks and Regards, Syed Mujeer Hashmi

SumitVaidya · ‎07-18-2012

Update...

FInally I was able to make it working. The problem was in tslib-1.0 source code and I had to comment a chunk of code to make it work. I also made some changes in startx and fslgnome scripts in rootfs for setting environment variables correctly.

Now its working as expected. This is resolved and closed.

Regards,

Sumit

SumitVaidya · ‎07-12-2012

More update.

Finally I was able to make my touchscreen working:). The problem was in I2C bus data and clock pin assignments and handling. I was able to resolve it. Now I have my "TSC2004" device registered and can see touch events on "/dev/input/event1".

Next step is to calibrate touchscreen and I am using tslib from root file system available on Freescale website. This is the log below for errors when I calibrate touchscreen:

Mounting filesystems

mount: mounting usbfs on /proc/bus/usb failed: No such file or directory

Starting the dropbear ssh server:

D-Bus per-session daemon address is: unix:abstract=/tmp/dbus-OW8J6eMDUD,guid=03bc44b0205f032679922e960000000c

gtk: creating gdk-pixbuf.loaders

pango: creating module list

starting pid 2505, tty '': '/etc/rc.d/rc_mxc.S'

_XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6

_XSERVTransOpen: transport open failed for inet6/freescale:0

_XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6

(EE) XKB: Couldn't open rules file /usr/share/X11/xkb/rules/base

(EE) XKB: No components provided for device Virtual core keyboard

unrecognised device identifier!

(EE) config/hal: NewInputDeviceRequest failed (2)

arm-none-linux-gnueabi-gcc (4.4.4_09.06.2010) 4.4.4

root filesystem built on Mon, 27 Feb 2012 14:53:29 -0500

Freescale Semiconductor, Inc.

freescale login: root

login[2508]: root login on 'ttymxc1'

BusyBox v1.18.5 () built-in shell (ash)

Enter 'help' for a list of built-in commands.

xres = 800, yres = 480

error: could not support the device

EV_SYN=1 //I wonder in kernel source code it is defined as 0x00

EV_ABS=0 //and this is defined as 0x03. I tried changing it with no luck :(

ABS_MT_POSITION_X=0

ABS_MT_POSITION_Y=0

ABS_MT_TOUCH_MAJOR=0

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <Alt>n=next

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <Alt>p=prev

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <Alt>c=close

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <Alt>d=desktop

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <Alt>m=!matchbox-remote -mbmenu

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <ctrl><alt>x=!xterm

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <ctrl><alt>r=!rxvt

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <ctrl><alt>e=!!gpe-calender

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <alt>Tab=next

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <alt><shift>Tab=prev

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <alt>space=taskmenu

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <alt>escape=!matchbox-remote -mbmenu

matchbox: keyboard does not appear to have a <alt> key.

matchbox: ignoring key shortcut <alt>f4=close

matchbox: Cant find a keycode for keysym 65480

matchbox: ignoring key shortcut f11=fullscreen

mbmenu: no _MB_THEME set on root window

matchbox-desktop: loading /usr/lib/matchbox/desktop/tasks.so with args ( None )

matchbox-desktop: loading /usr/lib/matchbox/desktop/dotdesktop.so with args ( None )

user_overides is (nil)

mb-desktop-dotdesktop: failed to open /usr/local/share/applications

mb-desktop-dotdesktop: failed to open //.applications

mb-applet-menu-launcher: bonobo-browser.desktop has no icon, png or name

mb-applet-menu-launcher: failed to open /usr/local/share/applications

mb-applet-menu-launcher: failed to open //.applications

mb-applet-menu-launcher: bonobo-browser.desktop has no icon, png or name

mb-applet-menu-launcher: failed to open /usr/local/share/applications

mb-applet-menu-launcher: failed to open //.applications