OK3568 4.19.206 Buildroot Lvgl8.2 Porting
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Overview
This document takes the migration of lvgl8.2 as an example to provide a reference for users to develop and migrate lightweight graphical interfaces.
Revision History
Date |
Version |
Revision History |
|---|---|---|
12/26/2024 |
V1.0 |
Initial Version |
Lvgl8.2 Porting
1. Source Code Acquisition Source
git clone -b release/v8.2 https://github.com/lvgl/lv_port_linux_frame_buffer.git
git clone -b release/v8.2 https://github.com/lvgl/lvgl.git
git clone -b release/v8.2 https://github.com/lvgl/lv_drivers.git
Copy the lvgl and lv _ drivers folders to the lv _ port _ Linux _ frame _ buffer folder.
2. Compilation Process
2.1 Modify lv_port_linux_frame_buffer/lv_conf.h file
/* clang-format off */
#if 1 /*Set it to "1" to enable content*/
/*Color depth: 1 (1 byte per pixel), 8 (RGB332), 16 (RGB565), 32 (ARGB8888)*/
#define LV_COLOR_DEPTH 32
/*1: use custom malloc/free, 0: use the built-in `lv_mem_alloc()` and `lv_mem_free()`*/
#define LV_MEM_CUSTOM 1
/*Show some widget. It might be required to increase `LV_MEM_SIZE` */
#define LV_USE_DEMO_WIDGETS 1
2.2 Modify lv_port_linux_frame_buffer/lv_drv_conf.h file
/* clang-format off */
#if 1 /*Set it to "1" to enable the content*/
#ifndef USE_FBDEV
# define USE_FBDEV 1
#endif
#if USE_FBDEV
# define FBDEV_PATH "/dev/fb0"
#endif
#ifndef USE_EVDEV
# define USE_EVDEV 1
#endif
#ifndef USE_BSD_EVDEV
# define USE_BSD_EVDEV 0
#endif
#if USE_EVDEV || USE_BSD_EVDEV
# define EVDEV_NAME "/dev/input/event1" /*You can use the "evtest" Linux tool to get the list of devices and test them*/
# define EVDEV_SWAP_AXES 0 /*Swap the x and y axes of the touchscreen*/
# define EVDEV_CALIBRATE 1 /*Scale and offset the touchscreen coordinates by using maximum and minimum values for each axis*/
# if EVDEV_CALIBRATE
# define EVDEV_HOR_MIN 0 /*to invert axis swap EVDEV_XXX_MIN by EVDEV_XXX_MAX*/
# define EVDEV_HOR_MAX 1024 /*"evtest" Linux tool can help to get the correct calibraion values>*/
# define EVDEV_VER_MIN 0
# define EVDEV_VER_MAX 600
# endif /*EVDEV_CALIBRATE*/
#endif /*USE_EVDEV*/
2.3 Modify lv_port_linux_frame_buffer/main.c file
#define DISP_BUF_SIZE (600 * 1024)
disp_drv.hor_res = 1024;
disp_drv.ver_res = 600;
2.4 Modify lv_port_linux_frame_buffer/Makefile file
CC ?= aarch64-buildroot-linux-gnu-gcc
CFLAGS ?= -O3 -g0 -I$(LVGL_DIR)/ # -Wall -Wshadow -Wundef -Wmissing-prototypes -Wno-discarded-qualifiers -Wall -Wextra -Wno-unused-function -Wno-error=strict-prototypes -
Wpointer-arith -fno-strict-aliasing -Wno-error=cpp -Wuninitialized -Wmaybe-uninitialized
-Wno-unused-parameter -Wno-missing-field-initializers -Wtype-limits -Wsizeof-pointer-
memaccess -Wno-format-nonliteral -Wno-cast-qual -Wunreachable-code -Wno-switch-default -
Wreturn-type -Wmultichar -Wformat-security -Wno-ignored-qualifiers -Wno-error=pedantic -
Wno-sign-compare -Wno-error=missing-prototypes -Wdouble-promotion -Wclobbered -
Wdeprecated -Wempty-body -Wtype-limits -Wshift-negative-value -Wstack-usage=2048 -Wno-
unused-value -Wno-unused-parameter -Wno-missing-field-initializers -Wuninitialized -
Wmaybe-uninitialized -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
-Wtype-limits -Wsizeof-pointer-memaccess -Wno-format-nonliteral -Wpointer-arith -Wno-
cast-qual -Wmissing-prototypes -Wunreachable-code -Wno-switch-default -Wreturn-type -
Wmultichar -Wno-discarded-qualifiers -Wformat-security -Wno-ignored-qualifiers -Wno-sign-
compare
2.5 Specify the cross-compiler to compile the source code
export CC=home/forlinx/OK3568-linux-source/buildroot/output/OK3568/host/bin/aarch64-buildroot-linux-gnu-gcc
Execute make-j4 under the lv _ port _ Linux _ frame _ buffer directory to compile the source code.
Finally, the demo executable file is generated in the lv _ port _ Linux _ frame _ buffer directory.
3. Test Method
Copy the demo to the development board, and close the/etc/init. d/weston before running the demo.
Begin by executing the/etc/init. D/S50weston stop command.
The display effect of running the demo is as follows:
4. Attachments