「App:Library:LVGL:docs:Porting:Input device interface」の版間の差分

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= Input device interface =
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== Types of input devices ==
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To register an input device an <code>lv_indev_drv_t</code> variable has to be initialized. Be sure to register at least one display before you register any input devices.
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lv_disp_drv_register(&disp_drv);
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static lv_indev_drv_t indev_drv;
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lv_indev_drv_init(&indev_drv);      /*Basic initialization*/
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indev_drv.type =...                /*See below.*/
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indev_drv.read_cb =...              /*See below.*/
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/*Register the driver in LVGL and save the created input device object*/
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lv_indev_t * my_indev = lv_indev_drv_register(&indev_drv);
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The <code>type</code> member can be:
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* <code>LV_INDEV_TYPE_POINTER</code> touchpad or mouse
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* <code>LV_INDEV_TYPE_KEYPAD</code> keyboard or keypad
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* <code>LV_INDEV_TYPE_ENCODER</code> encoder with left/right turn and push options
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* <code>LV_INDEV_TYPE_BUTTON</code> external buttons virtually pressing the screen
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<code>read_cb</code> is a function pointer which will be called periodically to report the current state of an input device.
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Visit Input devices to learn more about input devices in general.
  
  

2022年6月22日 (水) 09:42時点における版

https://docs.lvgl.io/8.2/porting/indev.html

英文 自動翻訳


Input device interface

Types of input devices

To register an input device an lv_indev_drv_t variable has to be initialized. Be sure to register at least one display before you register any input devices. 

lv_disp_drv_register(&disp_drv);

static lv_indev_drv_t indev_drv;
lv_indev_drv_init(&indev_drv);      /*Basic initialization*/
indev_drv.type =...                 /*See below.*/
indev_drv.read_cb =...              /*See below.*/
/*Register the driver in LVGL and save the created input device object*/
lv_indev_t * my_indev = lv_indev_drv_register(&indev_drv);

The type member can be:

  • LV_INDEV_TYPE_POINTER touchpad or mouse
  • LV_INDEV_TYPE_KEYPAD keyboard or keypad
  • LV_INDEV_TYPE_ENCODER encoder with left/right turn and push options
  • LV_INDEV_TYPE_BUTTON external buttons virtually pressing the screen

read_cb is a function pointer which will be called periodically to report the current state of an input device.

Visit Input devices to learn more about input devices in general.


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