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pazos · 10-16-2018, 10:55 AM

Touch Protocol

All devices support Single Touch Protocol. The Cervantes 4 (and maybe other recent models) emits both Single Touch and Multitouch B input events. The device reports:

Code:

evtest /dev/input/event1 
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "Neonode zForce touchscreen"
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    619
      Min        0
      Max     1072
    Event code 1 (ABS_Y)
      Value    832
      Min        0
      Max     1448
    Event code 24 (ABS_PRESSURE)
      Value      0
      Min        0
      Max     1048
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        1
    Event code 48 (ABS_MT_TOUCH_MAJOR)
      Value      0
      Min        0
      Max      255
    Event code 49 (ABS_MT_TOUCH_MINOR)
      Value      0
      Min        0
      Max      255
    Event code 52 (ABS_MT_ORIENTATION)
      Value      0
      Min        0
      Max        1
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     1072
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     1448
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
Properties:
Testing ... (interrupt to exit)

A single touch will output:

Code:

Event: time 51393.692783, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 1607
Event: time 51393.692786, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 350
Event: time 51393.692788, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 249
Event: time 51393.692789, type 3 (EV_ABS), code 48 (ABS_MT_TOUCH_MAJOR), value 8
Event: time 51393.692790, type 3 (EV_ABS), code 49 (ABS_MT_TOUCH_MINOR), value 8
Event: time 51393.692792, type 3 (EV_ABS), code 0 (ABS_X), value 249
Event: time 51393.692793, type 3 (EV_ABS), code 1 (ABS_Y), value 722
Event: time 51393.692795, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 51393.692796, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 1024
Event: time 51393.692797, -------------- SYN_REPORT ------------
Event: time 51393.694611, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 51393.694615, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 51393.694616, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 0
Event: time 51393.694617, -------------- SYN_REPORT ------------

KOReader only supports SingleTouch for these devices