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I am using 7Inch HDMI Touch Display with RPI zero.

I want to pass the pixel data ( or anything else related ) where touch is sensed to another device.

I could not find related information.

Is it even possible ? Any blog or something will do too. Thank you.

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  • what is the actual problem? ... you described three or more separate, unrelated functions in your question
    – jsotola
    Commented Oct 31, 2021 at 18:14
  • I just want touch pixels, where user touched.
    – dharmikP
    Commented Nov 1, 2021 at 5:51
  • so, what is stopping you?
    – jsotola
    Commented Nov 1, 2021 at 7:08
  • I could not find how to do that. One way I get this is by using GUI. When you touch anywhere it just give you mouser poiter data. But how to get raw data directly from display ?
    – dharmikP
    Commented Nov 2, 2021 at 7:37
  • Mouse* pointer* I mean sorry for this
    – dharmikP
    Commented Nov 2, 2021 at 7:38

1 Answer 1

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A touchscreen has no relation to the display it is attached to, and has no concept of pixels. Its driver receives analog signals from the matrix and produces X and Y coordinates which are float values between 0 and 1, and sometimes (depending on the device type and the driver) a byte encoding the pressure. If you know the underlying screen resolution, you can convert X and Y coordinates to pixels.

You can read "raw" touchscreen data using libinput. You will get a new input event every time the coordinates (and the pressure) change.

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