GDB Plug-In
Debugging LVGL with GDB
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.
Dump obj tree
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.
Show obj's style
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)
Connect to Debugger
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.