HID-over-I2C unstable BTN_TOUCH event

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HID-over-I2C unstable BTN_TOUCH event

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MicMoba
Contributor IV

Hello,

I have a touch screen connected that uses the HID-over-I2C protocol. The touch works except the long-press touch events.

I used evtest for checking the touch.

~$ ./evtest /dev/input/event0
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x3eb product 0x2151 version 0x100
Input device name: "hid-over-i2c 03EB:2151"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value   1232
      Min        0
      Max     4095
      Resolution      15
    Event code 1 (ABS_Y)
      Value   3035
      Min        0
      Max     4095
      Resolution      25
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        9
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     4095
      Resolution      15
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     4095
      Resolution      25
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
Properties:
  Property type 1 (INPUT_PROP_DIRECT)
Testing ... (interrupt to exit)
Event: time 1581777887.342273, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 24
Event: time 1581777887.342273, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1853
Event: time 1581777887.342273, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 1815
Event: time 1581777887.342273, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1581777887.342273, type 3 (EV_ABS), code 0 (ABS_X), value 1853
Event: time 1581777887.342273, type 3 (EV_ABS), code 1 (ABS_Y), value 1815
Event: time 1581777887.342273, -------------- SYN_REPORT ------------
Event: time 1581777887.452048, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 1581777887.452048, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 1581777887.452048, -------------- SYN_REPORT ------------
Event: time 1581777887.810668, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 25
Event: time 1581777887.810668, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1581777887.810668, -------------- SYN_REPORT ------------
Event: time 1581777887.814014, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 1581777887.814014, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 1581777887.814014, -------------- SYN_REPORT ------------

I put my finger to the touch and let it on it. You can see that the BTN_TOUCH event came multiple.

Is there a way to set a threshold?

Thanks

Michael

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Michael

>touch screen connected that uses the HID-over-I2C protocol..

>Is there a way to set a threshold?

since touch is connected through i2c, "threshold" (if that touch part has such parameter

adjustable) should be configurable also through some i2c commands.

Suggest to apply to vendor of that touch screen for additional settings of such parameter.

Best regards
igor
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