MXC_A39_20240320/MXC-A39/lv_drivers/wayland

Wayland display and input driver

Wayland display and input driver, with support for keyboard, mouse and touchscreen. Keyboard support is based on libxkbcommon.

NOTE: current implementation only supports wl_shell shell with no decorations.

Install headers and libraries

Ubuntu

sudo apt-get install libwayland-dev libxkbcommon-dev

Fedora

sudo dnf install wayland-devel libxkbcommon-devel

Build configuration under Eclipse

In "Project properties > C/C++ Build > Settings" set the followings:

• "Cross GCC Compiler > Command line pattern"

  • Add ${wayland-cflags} and ${xkbcommon-cflags} to the end (add a space between the last command and this)

• "Cross GCC Linker > Command line pattern"

  • Add ${wayland-libs} and ${xkbcommon-libs} to the end (add a space between the last command and this)

• "Cross GCC Linker > Libraries"

  • Add pthread

• In "C/C++ Build > Build variables"

  • Configuration: [All Configuration]

  • Add

    • Variable name: wayland-cflags
      • Type: String
      • Value: pkg-config --cflags wayland-client
    • Variable name: wayland-libs
      • Type: String
      • Value: pkg-config --libs wayland-client
    • Variable name: xkbcommon-cflags
      • Type: String
      • Value: pkg-config --cflags xkbcommon
    • Variable name: xkbcommon-libs
      • Type: String
      • Value: pkg-config --libs xkbcommon

Init Wayland in LVGL

1. In main.c #incude "lv_drivers/wayland/wayland.h"
2. Enable the Wayland driver in lv_drv_conf.h with USE_WAYLAND 1
3. LV_COLOR_DEPTH should be set either to 32 or 16 in lv_conf.h; support for 8 and 1 depends on target platform.
4. After lv_init() call wayland_init()
5. Before lv_deinit() call wayland_deinit()
6. Add a display:

  static lv_disp_buf_t disp_buf1;
  static lv_color_t buf1[LV_HOR_RES_MAX * LV_VER_RES_MAX];
  lv_disp_buf_init(&disp_buf1, buf1, NULL, LV_HOR_RES_MAX * LV_VER_RES_MAX);

  /* Create a display */
  lv_disp_drv_t disp_drv;
  lv_disp_drv_init(&disp_drv);
  disp_drv.buffer = &disp_buf1;
  disp_drv.flush_cb = wayland_flush;

7. Add keyboard:

  lv_indev_drv_t indev_drv_kb;
  lv_indev_drv_init(&indev_drv_kb);
  indev_drv_kb.type = LV_INDEV_TYPE_KEYPAD;
  indev_drv_kb.read_cb = wayland_keyboard_read;
  lv_indev_drv_register(&indev_drv_kb);

8. Add touchscreen:

  lv_indev_drv_t indev_drv_touch;
  lv_indev_drv_init(&indev_drv_touch);
  indev_drv_touch.type = LV_INDEV_TYPE_POINTER;
  indev_drv_touch.read_cb = wayland_touch_read;
  lv_indev_drv_register(&indev_drv_touch);

9. Add mouse:

  lv_indev_drv_t indev_drv_mouse;
  lv_indev_drv_init(&indev_drv_mouse);
  indev_drv_mouse.type = LV_INDEV_TYPE_POINTER;
  indev_drv_mouse.read_cb = wayland_pointer_read;
  lv_indev_drv_register(&indev_drv_mouse);

10. Add mouse wheel as encoder:

  lv_indev_drv_t indev_drv_mousewheel;
  lv_indev_drv_init(&indev_drv_mousewheel);
  indev_drv_mousewheel.type = LV_INDEV_TYPE_ENCODER;
  indev_drv_mousewheel.read_cb = wayland_pointeraxis_read;
  lv_indev_drv_register(&indev_drv_mousewheel);