GDB Plug-In

Debugging LVGL with GDB

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To facilitate debugging LVGL with GDB, a GDB plugin is provided. This plugin can be found in the lvgl/scripts/gdb directory. The GDB plugin can be used with any target where GDB is available. For example, you can use it to debug a device connected to a PC via JLink, which provides a GDB server. Additionally, if your device crashes and you have a core dump, you can use GDB to analyze the core dump. To load the LVGL GDB plugin within GDB's command line, type the following command:

source lvgl/scripts/gdb/gdbinit.py

Example of usage:

(gdb) source lvgl/scripts/gdb/gdbinit.py

(gdb) dump obj -L 2
obj@0x60700000dd10 (0,0,799,599)
tabview@0x608000204ca0 (0,0,799,599)
    obj@0x607000025da0 (0,0,799,69)
    obj@0x607000025e80 (0,70,799,599)
    obj@0x60700002bd70 (743,543,791,591)
    btn@0x60700002c7f0 (747,547,787,587)
keyboard@0x60d0000f7040 (0,300,799,599)
dropdown-list@0x608000205420 (0,0,129,129)
    label@0x60d0000f7ba0 (22,22,56,39)
(gdb)

The plugin provides the following commands.

dump obj: Dump the object tree.
info style: Show the object's style.

为了使用GDB调试LVGL，提供了一个GDB插件。该插件位于``lvgl/scripts/gdb``目录中。 GDB插件可以用于任何支持GDB的目标设备。例如，可以用它调试通过JLink连接到PC的设备，该设备提供了一个GDB服务器。此外，如果您的设备崩溃并生成了核心转储文件，还可以使用GDB分析核心转储文件。要在GDB命令行中加载LVGL GDB插件，请输入以下命令：

source lvgl/scripts/gdb/gdbinit.py

使用示例：

(gdb) source lvgl/scripts/gdb/gdbinit.py

(gdb) dump obj -L 2
obj@0x60700000dd10 (0,0,799,599)
tabview@0x608000204ca0 (0,0,799,599)
    obj@0x607000025da0 (0,0,799,69)
    obj@0x607000025e80 (0,70,799,599)
    obj@0x60700002bd70 (743,543,791,591)
    btn@0x60700002c7f0 (747,547,787,587)
keyboard@0x60d0000f7040 (0,300,799,599)
dropdown-list@0x608000205420 (0,0,129,129)
    label@0x60d0000f7ba0 (22,22,56,39)
(gdb)

该插件提供以下命令：

dump obj: 导出对象树。
info style: 显示对象的样式。

Dump obj tree

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dump obj: Dump the object tree.

dump obj -L 2: Dump the object tree with a depth of 2.

dump obj -a 0x60700000dd10: Dump the object tree starting from the specified address.

dump obj: 导出对象树。

dump obj -L 2: 导出深度为2的对象树。

dump obj -a 0x60700000dd10: 从指定地址开始导出对象树。

Show obj's style

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This command can dump the object's local style, since style value is a union, it's displayed in all possible formats.

info style address_of_obj: Show the object's style.

Example:

(gdb) info style 0x60700000dd10
  32 = {num = 90, ptr = 0x5a, color = {blue = 90 'Z', green = 0 '\000', red = 0 '\000'}}
  158 = {num = 32767, ptr = 0x7fff, color = {blue = 255 '\377', green = 127 '\177', red = 0 '\000'}}
(gdb) p lv_global->disp_default->act_scr
$4 = (lv_obj_t *) 0x60700000dd10
(gdb) info style $4
  32 = {num = 90, ptr = 0x5a, color = {blue = 90 'Z', green = 0 '\000', red = 0 '\000'}}
  158 = {num = 32767, ptr = 0x7fff, color = {blue = 255 '\377', green = 127 '\177', red = 0 '\000'}}
(gdb)

此命令可以导出对象的本地样式。由于样式值是一个联合体，因此会以所有可能的格式显示。

info style address_of_obj: 显示对象的样式。

示例：

(gdb) info style 0x60700000dd10
  32 = {num = 90, ptr = 0x5a, color = {blue = 90 'Z', green = 0 '\000', red = 0 '\000'}}
  158 = {num = 32767, ptr = 0x7fff, color = {blue = 255 '\377', green = 127 '\177', red = 0 '\000'}}
(gdb) p lv_global->disp_default->act_scr
$4 = (lv_obj_t *) 0x60700000dd10
(gdb) info style $4
  32 = {num = 90, ptr = 0x5a, color = {blue = 90 'Z', green = 0 '\000', red = 0 '\000'}}
  158 = {num = 32767, ptr = 0x7fff, color = {blue = 255 '\377', green = 127 '\177', red = 0 '\000'}}
(gdb)

Connect to Debugger

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This command provides the ability to connect and debug GDB Python Script using IDE.

Connect to PyCharm / VSCode / Eclipse(not support yet)

debugger -t pycharm

debugger -t vscode

debugger -t eclipse

How to use it specifically, search pydevd_pycharm / debugpy for details.

此命令提供通过IDE连接和调试GDB Python Script的能力。

连接到``PyCharm`` / VSCode / Eclipse(暂不支持)

debugger -t pycharm

debugger -t vscode

debugger -t eclipse

具体使用方法，请搜索``pydevd_pycharm`` / ``debugpy``了解详情。