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Linux/TSC2007: Does the pressure value of tsc2007 have to be equal at all points?

kwon taeyoung
Prodigy 20 points
Part Number: TSC2007

Tool/software: Linux

Hi. all

I am using tsc2007 on linux.
The driver uses a common linux kernel driver.
I am testing the touch using tslib.(ts_test)
I am looking at the pressure value and usually read a value of 1000 or more.
But on my touchscreen, the pressure on the top part is low.

The data below is data dragged from bottom to top of the touch screen.
Pressure value decreases from "1517390700.277173" part.

root@test:~# ts_test
1517390700.077173: 247 167 1168
1517390700.087176: 247 166 1176
1517390700.097172: 247 166 1182
1517390700.107171: 246 165 1186
1517390700.117170: 246 165 1189
1517390700.127171: 246 164 1192
1517390700.137175: 246 163 1200
1517390700.147172: 246 163 1206
1517390700.157172: 246 162 1206
1517390700.167171: 245 162 1202
1517390700.177172: 245 161 1197
1517390700.187176: 245 160 1188
1517390700.197172: 245 160 1180
1517390700.207173: 246 160 1177
1517390700.217171: 246 159 1176
1517390700.227170: 246 159 1175
1517390700.237176: 246 158 1179
1517390700.247174: 246 158 1183
1517390700.257173: 246 157 1184
1517390700.267182: 246 157 1185
1517390700.277173: 246 156 742
1517390700.287176: 246 155 450
1517390700.297172: 246 155 231
1517390700.307172: 246 154 9
1517390700.317173: 246 153 9
1517390700.327172: 245 153 10
1517390700.337174: 245 152 12
1517390700.347171: 245 152 14
1517390700.357172: 245 151 16
1517390700.367173: 245 151 18
1517390700.377171: 245 150 18
1517390700.387174: 245 150 20
1517390700.397172: 245 149 21

I am confused by this data.
Does the pressure value of tsc2007 have to be equal at all points?
Or is the pressure value of my touch data normal?

  • 0
    TI__Guru**** 168425 points
    Hi kwon,

    Welcome to our e2e Forum! I'm sorry it has taken so long to respond, I am trying to have one of our TSC experts get you more information.
  • 0 in reply to Tom Hendrick
    Prodigy 20 points
    Hi Tom,

    I was using the wrong x-plate-ohms.
    I was using 600 for x-plate-ohms.

    I set the x-plate-ohms back to 300.
    300, the pressure value became equal.


    1519091727.487293: 61 447 487
    1519091727.497295: 58 441 499
    1519091727.507297: 54 434 504
    1519091727.517296: 52 426 511
    1519091727.527296: 50 420 505
    1519091727.537294: 47 414 499
    1519091727.547299: 46 407 501
    1519091727.557297: 45 399 501
    1519091727.567297: 44 392 505
    1519091727.577297: 44 386 502
    1519091727.587297: 44 379 504
    1519091727.597296: 45 374 496
    1519091727.607296: 45 366 505
    1519091727.617297: 46 361 491
    1519091727.627296: 48 355 492
    1519091727.637296: 49 350 491
    1519091727.647297: 52 345 491
    1519091727.657297: 55 340 494
    1519091727.667295: 56 337 487
    1519091727.677296: 59 333 487
    1519091727.687294: 63 330 486
    1519091727.697297: 66 327 478
    1519091727.707294: 70 323 478
    1519091727.717297: 75 320 477
    1519091727.727296: 79 319 473
    1519091727.737296: 86 316 478
    1519091727.747297: 91 313 470
    1519091727.757297: 97 309 472
    1519091727.767297: 104 307 469
    1519091727.777298: 111 305 461
    1519091727.787297: 119 302 458

    Regards,

    kwon