HID增加按键

最新推荐文章于 2024-05-07 10:23:51 发布

micro9981

最新推荐文章于 2024-05-07 10:23:51 发布

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本文链接：https://blog.youkuaiyun.com/micro9981/article/details/80969707

本文详细介绍了键盘按键映射到操作系统的实现方式，包括通用键盘布局和特定键位对应的按键码，如F7和F8的功能键映射。通过具体代码示例展示了不同按键如何被识别并转换为系统能够理解的信号。

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common/drivers/hid/hid-input.c

static const unsigned char hid_keyboard[256] = {
      0,  0,  0,  0, 30, 48, 46, 32, 18, 33, 34, 35, 23, 36, 37, 38,
     50, 49, 24, 25, 16, 19, 31, 20, 22, 47, 17, 45, 21, 44,  2,  3,
      4,  5,  6,  7,  8,  9, 10, 11, 28,  1, 14, 15, 57, 12, 13, 26,
     27, 43, 43, 39, 40, 41, 51, 52, 53, 58, 59, 60, 61, 62, 63, 64,
     65, 66, 67, 68, 87, 88, 99, 70,119,110,102,104,111,107,109,106,

frameworks/base/data/keyboards/Generic.kl
key 65 F7
key 66 F8

  frameworks/native/include/android/keycodes.h
  frameworks/native/include/input/InputEventLabels.h
  frameworks/base/core/res/res/values/attrs.xml

与下面一一对应
frameworks/base/core/java/android/view/KeyEvent.java

  /** Key code constant: F7 key. */
    public static final int KEYCODE_F7              = 137;
    /** Key code constant: F8 key. */
    public static final int KEYCODE_F8              = 138;