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fix(evdev): fix touch point reading failure #8029

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@TaoAaron TaoAaron commented Apr 1, 2025

1、When I was using lvgl release v9.0, I found that my touch screen had no touch feedback, but i can get touch coordinates from /dev/inputt/envent2. I added debugging information and found that the values of dsc->min_x, dsc->max_x, dsc->min_y, and dsc->max_y are all 0. This caused _evdev_calibrate to miscalculate, causing the reported screen coordinates to be wrong and the screen touch to fail.

2、So get the absinfo assignment for the x and y axes of the event device to dsc->min_x, dsc->max_x, dsc->min_y, dsc->max_y can fixes this error.

3、By the way, the latest release v9.2 does not have this bug.

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The values of dsc->min_x, dsc->max_x, dsc->min_y, and dsc->max_y are 0, causing an error in _evdev_calibrate that causes the screen touch to fail.
So get the absinfo assignment for the x and y axes of the event device to dsc->min_x, dsc->max_x, dsc->min_y, dsc->max_y can fixes this error.
@TaoAaron TaoAaron closed this Apr 1, 2025
@TaoAaron TaoAaron reopened this Apr 1, 2025
@FASTSHIFT FASTSHIFT changed the title fix(lv_evdev_create):fix screen touch failure fix(evdev): fix touch point reading failure Apr 8, 2025
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Thanks! We can also port it to v9.1 after. Please fix the formatting problem reported by the CI.

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