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Co-authored-by: Kevin Schlosser <kdschlosser@users.noreply.github.com> Co-authored-by: Liam <30486941+liamHowatt@users.noreply.github.com>
58 lines
1.7 KiB
ReStructuredText
58 lines
1.7 KiB
ReStructuredText
==================
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Linux Evdev Driver
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==================
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Overview
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--------
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The Linux event device (evdev) is a hardware-independent API that gives access to input events from,
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for example, a mouse or touchscreen. It is exposed via the Linux device file system interface.
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Prerequisites
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-------------
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Your system has an input device configured (usually under ``/dev/input/`` such as ``/dev/input/event0``).
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Configuring the driver
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----------------------
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Enable the Linux LVGL evdev driver support in ``lv_conf.h``.
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.. code-block:: c
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#define LV_USE_EVDEV 1
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Usage
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-----
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To set up an event input, first create an input device with ``lv_edev_create`` setting it to the correct Linux event device.
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Then link this to the LVGL display with ``lv_indev_set_display``.
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.. code-block:: c
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lv_indev_t *touch = lv_evdev_create(LV_INDEV_TYPE_POINTER, "/dev/input/event0");
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lv_indev_set_display(touch, disp);
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Ensure that an ``lv_display_t`` object is already created for ``disp``. An example for this is shown below, using the Linux framebuffer driver.
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.. code-block:: c
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lv_display_t * disp = lv_linux_fbdev
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lv_linux_fbdev_set_file(disp, "/dev/fb0");_create();
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Locating your input device
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--------------------------
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If you can't determine your input device, first run
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```$cat /proc/bus/input/devices```
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This should show input devices and there will be entries with the word ``event`` which give a clue as to the device to use eg. ``event1`` would be ``/dev/input/event1``.
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You can use ``evtest`` to show data from that event source to see if it is actually the one you want.
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Try:
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``$evtest /dev/input/event1`` replacing ``eventX`` with your event device from above.
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