AM335x LCD touch offset issue

Hi Vishnu,

Please make sure that the "pointercal" file is missing from both of the following locations on your SD card:

<root_partition>/etc/pointercal
<boot_partition>/pointercal

Best verify this on your host PC and use the "sync" command to write the changes you have made. Then boot your board again and see what happens.

Best regards,
Miroslav

Dear Miroslav,

               Still we are facing offset after the reboot, as per your suggestion we deleted pointercal from root and boot partition. then recalibrated and touch is working perfectly, after power recycled the board, touch screen got offset.
 what is reason for this issues?

Regards                                                                                                                                                                                                  Jithin

Dear Miroslav,

      One more information that there is no issue with 4.3Inch LCD Display.

This will work after reboot or power recycle.

My LCD info for 4.3

 [2] = {
                .name = "LCD4.3",
                .width = 480,
                .height = 272,
                .hfp = 2,
                .hbp = 2,
                .hsw = 41,
                .vfp = 12,
                .vbp = 2,
                .vsw = 10,
                .pxl_clk = 9000000,
                .invert_pxl_clk = 0,
        },

My LCD info for 7Inch

[7] = {
                .name = "LCD7",
                .width = 800,
                .height = 480,
                .hfp = 39,
                .hbp = 39,
                .hsw = 47,
                .vfp = 13,
                .vbp = 29,
                .vsw = 2,
                .pxl_clk = 30000000,
                .invert_pxl_clk = 0,
        },

Regards

Jithin.

Hi Jithin,

Can you verify that the "fbset" command reports the same values before and after system reset.

Best regards,
Miroslav

Dear Miroslav,

Calibrated data at fist time

Calibrating touchscreen (first time only)xres = 800, yres = 480
Took 13 samples...
Top left : X = 3414 Y = 3741
Took 18 samples...
Top right : X = 3434 Y =  354
Took 18 samples...
Bot right : X =  467 Y =  340
Took 7 samples...
Bot left : X =  504 Y = 3752
Took 12 samples...
Center : X = 1968 Y = 2046
821.194214 0.000113 -0.205910
492.429474 -0.129304 0.000327
Calibration constants: 53817784 7 -13494 32271858 -8474 21 65536

FBSET after the calibration

mode "800x480-62"
    # D: 30.000 MHz, H: 32.433 kHz, V: 61.895 Hz
    geometry 800 480 800 1024 16
    timings 33333 39 39 29 13 47 2
    rgba 5/11,6/5,5/0,0/0
endmode

FBSET after Power Recycle

mode "800x480-62"
    # D: 30.000 MHz, H: 32.433 kHz, V: 61.895 Hz
    geometry 800 480 800 1024 16
    timings 33333 39 39 29 13 47 2
    rgba 5/11,6/5,5/0,0/0
endmode

I think there is no change.

Regards

Jithin

Have you tried the ts_print user-space tool? Is the offset reported by the application? Is it constant?

Best regards,
Miroslav

Dear Miroslav,

  I am using TI Filesystem from SDK which have MatrixGUI Desktop.

As per your comment i try to recalibrate and the below follows the output, removed pointercal from boot and root partition

Calibrating touchscreen (first time only)xres = 800, yres = 480
Took 34 samples...
Top left : X = 3546 Y = 3804
Took 15 samples...
Top right : X = 3578 Y =  407
Took 11 samples...
Bot right : X =  661 Y =  397
Took 9 samples...
Bot left : X =  644 Y = 3809
Took 4 samples...
Center : X = 2089 Y = 2083
831.372742 0.000186 -0.205602
516.696960 -0.130601 -0.000936
Calibration constants: 54484844 12 -13474 33862252 -8559 -61 65536

ts_print output after 2, 3 times

root@am335x-evm:~# ts_print
1324025672.084559:    600    151    176
1324025672.088374:    599    151    162
1324025672.090632:    598    151      0
1324025675.624659:    605    266    229
1324025675.626582:    605    266    229
1324025675.628504:    605    266    228
1324025675.630427:    605    266    228
1324025675.645625:    605    267    228
1324025675.653529:    605    267      0
1324025679.125147:    593    139    208
1324025679.127070:    592    139    208
1324025679.128992:    592    140    209
1324025679.140437:    593    140    210
1324025679.142329:    593    140    211
1324025679.149928:    595    140    212
1324025679.153742:    594    141    213
1324025679.168909:    594    141    212
1324025679.174616:    594    141    211
1324025679.182185:    594    141    204
1324025679.186304:    596    141      0

Reboot or power recycling the board.

ts_print after reboot with offset.

1324025780.782862:    654    267    219
1324025780.792353:    655    268    233
1324025780.796198:    657    268    237
1324025780.804133:    660    268      0
1324025783.824946:    654    266    215
1324025783.826868:    656    267    218
1324025783.828791:    655    267    223
1324025783.830744:    656    267    225
1324025783.832667:    657    267    230
1324025783.844050:    656    267    238
1324025783.845972:    657    267    242
1324025783.849787:    657    267    246
1324025783.857386:    657    267    249
1324025783.859309:    657    267    249
1324025783.863093:    657    267    249
1324025783.866907:    657    267    249
1324025783.880152:    657    267    250
1324025783.883967:    656    267    250
1324025783.885859:    656    267    250
1324025783.889674:    656    267    250
1324025783.891566:    655    266    250
1324025783.893458:    655    266    250
1324025783.895380:    656    267    249
1324025783.897272:    656    267    249
1324025783.899195:    657    267    248
1324025783.901087:    657    267    246
1324025783.904902:    658    267    233
1324025783.905238:    660    266      0
1324025784.921809:    647    252    245
1324025784.925623:    645    252    248
1324025784.933253:    645    252    247
1324025784.935175:    645    252    246
1324025784.937098:    645    252    247
1324025784.939021:    644    252    247
1324025784.940943:    644    252    246
1324025784.952326:    645    252    247
1324025784.954249:    646    253    249
1324025784.959925:    647    253    249
1324025784.961848:    646    253    250
1324025784.963740:    646    253    249
1324025784.965662:    645    253    248
1324025784.967585:    645    252    248
1324025784.980830:    644    253    248
1324025784.982752:    643    252    248
1324025784.994440:    641    251      0
1324025785.758723:    767    334    255
1324025785.760615:    768    334    255
1324025785.764460:    768    334    255
1324025785.773981:    768    334    255
1324025785.781580:    767    335    256
1324025785.791041:    767    334    256
1324025785.792963:    768    334    256
1324025785.796778:    767    334    256
1324025785.804377:    768    334    257
1324025785.806269:    769    334    257
1324025785.813868:    768    335    257
1324025785.815760:    768    334    254
1324025785.819605:    767    334    255
1324025785.823389:    767    334    255
1324025785.827204:    766    334    256
1324025785.829096:    767    334    257
1324025785.832911:    767    334    256
1324025785.846186:    768    334    256
1324025785.855647:    768    335    255
1324025785.857569:    768    335    254
1324025785.861353:    768    335    251
1324025785.867365:    767    334      0

Regards

Jithin

Dear Miroslav,

Is there any solution for this?

Thanks

Vishnu

Try to disable this part of the /etc/init.d/matrix-gui-2.0 script, then remove the pointercal calibration files and reboot your system. Check how the touchscreen will behave and report back.

    # Do not try to calibrate the touchscreen if it doesn't exist.
    if [ -e /dev/input/touchscreen0 ]
    then
        export QWS_MOUSE_PROTO=Tslib:/dev/input/touchscreen0
        # Check if the SD card is mounted and the first partition is
        # vfat.  If so let's write the pointercal file there so that if
        # someone messes up calibration they can just delete the file from
        # any system and reboot the board.
        mount | grep /media/mmcblk0p1 | grep vfat > /dev/null 2>&1
        if [ "$?" = "0" ]
        then
            tsfile=/media/mmcblk0p1/pointercal
            export TSLIB_CALIBFILE=$tsfile
        fi

        if [ ! -f $tsfile ] ; then
            echo -n "Calibrating touchscreen (first time only)"
            ts_calibrate
            echo "."
            # If we create a pointercal file and it was not in /etc/pointercal
            # let's copy it there as well if it does not already exist.
            if [ ! -f /etc/pointercal -a -f $tsfile ]
            then
                cp $tsfile /etc/pointercal
            fi
        fi
    fi

Best regards,
Miroslav