How LCD calibration is done and what all files are present is SDKv7??

Vishal 118

Intellectual 635 points

Hello Friends,

I am working on Starter Kit with SDKv7. I am interested to know about LCD working and LCD calibration Part.

If there is any TI document or link able for learning then Please share it.

Also tell the path of LCD related files(calibration and other driver) present in Linux.

Regards,

Vishal Rana

over 11 years ago

0 Titusrathinaraj Stalin over 11 years ago

TI__Guru** 116100 points

Hi Vishal,

Try to use "ts_calibrate" command to calibrate the LCD touchscreen.

http://processors.wiki.ti.com/index.php/Tslib

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

http://processors.wiki.ti.com/index.php/AM335x_Touchscreen_Driver%27s_Guide#Tslib

0 Miroslav Kiradzhiyski XID over 11 years ago

TI__Mastermind 25235 points

Hi,

Here is a relevant wiki page: http://processors.wiki.ti.com/index.php/How_to_Recalibrate_the_Touchscreen

Here is a wiki page (including sources) for the tslib library, which includes the ts_calibrate user-space tool: http://processors.wiki.ti.com/index.php/Tslib

The touch screen driver can be found inside <linux_kernel_dir>/drivers/mfd/ti_am335x_tscadc.c

Device tree documentation: <linux_kernel_dir>/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt

More SDKv7 touch screen related wiki: http://processors.wiki.ti.com/index.php/Sitara_Linux_SDK_Touchscreen

Best regards,
Miroslav

0 Vishal 118 over 11 years ago in reply to Miroslav Kiradzhiyski XID

Intellectual 635 points

Thanks Champs Miroslav and T.Stalin. Thanks for sharing information.

0 Josh Elliott over 11 years ago in reply to Vishal 118

TI__Expert 3010 points

Hello,

You can also find general information on the LCD Controller on our Sitara LCDC page: http://processors.wiki.ti.com/index.php/Sitara_SDK_Linux_LCDC

Regards,

Josh

0 Vishal 118 over 11 years ago in reply to Josh Elliott

Intellectual 635 points

Hi,

Thank you Josh this information is really valuable.

Presently, we are using Resistive touch for our product but also planning to use capacitive touch screen

for newer one. So I want to know, how much efforts it will take.

One more thing. Please explain or add comments to below highlighted lines of code.

tsc {

ti,wires = <4>;// four wire TS

ti,x-plate-resistance = <200>;//??

ti,coordiante-readouts = <5>;/??

ti,wire-config = <0x00 0x11 0x22 0x33>;//??

};

adc {

ti,adc-channels = <4 5 6 7>;

};

Regards,

Vishal

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How LCD calibration is done and what all files are present is SDKv7??