Reg: Touch Screen

[vishvapathi]

Hi All,

I am interested in interfacing Touch Screen with my EVB. I am getting Display in my screen, but not able to use Touch Screen.

Kindly advice how to enable and calibrate for touch screen.

Vishva

DaianeAngolini

[daiane_angolini]

Let´s start from the beginning:

What´s your board?

What´s your kernel?

What´s your rootfs maker?

[vishvapathi]

I am using I.MX 6Q SABRE SDB. Kernel - L3.0.35. LTIB

[daiane_angolini]

I think it´s 2 step debug;

* Are your touchscreen driver working?

- try with "evtest" and see if you can get the touch events from kernel

* Are your touch calibrated?

- try Qt-embedded Touch screen problem on IMX53 (SABRE tablet)

Please, let me know

[vishvapathi]

Hi Daiane,

evtest /dev/input/event0
Input driver version is 1.0.1
Input device ID: bus 0x0 vendor 0x0 product 0x0 version 0x0
Input device name: "ads7846"
Supported events:
Event type 0 (Sync)
Event type 1 (Key)
	Event code 330 (Touch)
Event type 3 (Absolute)
	Event code 0 (X)
	Value	0
	Min	0
	Max	4095
	Event code 1 (Y)
	Value	0
	Min	0
	Max	4095
	Event code 24 (Pressure)
	Value	0
	Min	0
	Max	0

Testing ... (interrupt to exit)

[daiane_angolini]

and, when you tap your display you can see data coming?

[vishvapathi]

Nope... its just blank...

[daiane_angolini]

So, the problem is the driver

Do you know what LCD/LVDS panel you have?

[vishvapathi]

Bought it from embest technologies.. not sure abt make.....

[daiane_angolini]

Do you have a picture?

Partnumber?

[vishvapathi]

LCD8000-97C

http://www.embest-tech.com/shop/product/lcd8000-97c.html

Chk this link plz...

[daiane_angolini]

is this connected as USB?

[vishvapathi]

No... Lvds..

[daiane_angolini]

Have you changed your kernel command line?

[vishvapathi]

To wat???

[daiane_angolini]

ussualy I add

video=mxcfb1:dev=ldb,LDBXGA,if=RGB666

to the default LVDS pannel for imx6qsabresd

[vishvapathi]

Ya.. to set environment I did the same. M getting display, only touch is not working...

[daiane_angolini]

double check if the touchscreen driver is selected in menuconfig.

make sure to use the right one for your display

[vishvapathi]

Hi,

  I tried the same in MarS board also. I am getting only the display, touch is not working.:smileysad:

[daiane_angolini]

Could you share what do you changed on your kernel configuration? (make menuconfig)

[vishvapathi]

I have selected ADS7846/TSC2046/AD7873 and AS(S)7843 based touch screens in device drivers selection. i am recompiling and trying it again..