目的
実機環境やクロスコンパイル環境を用意せず
Linux上で手軽に LVGL の動作確認をする
確認した環境
- fedora(rawhide: 20250304) + xfce
確認したcommit id
| repository | commit id |
|---|---|
| lv_port_linux | b5b3c41998820768792eedc619f9836435c8d354 |
| lvgl | 5c5ae5d2bc9b3626bfed246a8533a1b1a3aeba20 |
手順
事前準備
SDLを利用する場合
sudo yum install -y libevdev-devel.x86_64 SDL2_image-devel.x86_64
fbdevなどを使用するひとはrpm無いので自分でコンパイルする必要あると思う
ダウンロード
git clone --recursive --depth=1 https://github.com/lvgl/lv_port_linux.git
パッチ
以下を適当な名前(例えばsdl2.patch)で保存して
パッチ
diff --git a/Makefile b/Makefile
index 7ccd1a6..3ae9f5e 100644
--- a/Makefile
+++ b/Makefile
@@ -11,8 +11,8 @@ WARNINGS := -Wall -Wshadow -Wundef -Wmissing-prototypes -Wno-discarded-qualifie
-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 \
-Wshift-negative-value -Wstack-usage=2048 -Wno-unused-value -std=gnu99
-CFLAGS ?= -O3 -g0 -I$(LVGL_DIR)/ $(WARNINGS)
-LDFLAGS ?= -lm -lstdc++
+CFLAGS ?= -O3 -g0 -I$(LVGL_DIR)/ -Isrc/lib $(WARNINGS)
+LDFLAGS ?= -lm -lstdc++ -lSDL2 -lSDL2_image
BIN = main
BUILD_DIR = ./build
BUILD_OBJ_DIR = $(BUILD_DIR)/obj
@@ -22,11 +22,10 @@ prefix ?= /usr
bindir ?= $(prefix)/bin
#Collect the files to compile
-MAINSRC = ./main.c
+MAINSRC =
include $(LVGL_DIR)/lvgl/lvgl.mk
-
-CSRCS +=$(LVGL_DIR)/mouse_cursor_icon.c
+CSRCS += $(shell find src -type f -name '*.c')
OBJEXT ?= .o
diff --git a/lv_conf.h b/lv_conf.h
index adb7053..911a738 100644
--- a/lv_conf.h
+++ b/lv_conf.h
@@ -299,7 +299,7 @@
#define LV_USE_DRAW_DAVE2D 0
/** Draw using cached SDL textures*/
-#define LV_USE_DRAW_SDL 0
+#define LV_USE_DRAW_SDL 1
/** Use VG-Lite GPU. */
#define LV_USE_DRAW_VG_LITE 0
@@ -1142,7 +1142,7 @@
*==================*/
/** Use SDL to open window on PC and handle mouse and keyboard. */
-#define LV_USE_SDL 0
+#define LV_USE_SDL 1
#if LV_USE_SDL
#define LV_SDL_INCLUDE_PATH <SDL2/SDL.h>
#define LV_SDL_RENDER_MODE LV_DISPLAY_RENDER_MODE_DIRECT /**< LV_DISPLAY_RENDER_MODE_DIRECT is recommended for best performance */
@@ -1172,7 +1172,7 @@
#endif
/** Driver for /dev/fb */
-#define LV_USE_LINUX_FBDEV 1
+#define LV_USE_LINUX_FBDEV 0
#if LV_USE_LINUX_FBDEV
#define LV_LINUX_FBDEV_BSD 0
#define LV_LINUX_FBDEV_RENDER_MODE LV_DISPLAY_RENDER_MODE_PARTIAL
Submodule lvgl contains modified content
diff --git a/lvgl/env_support/cmake/custom.cmake b/lvgl/env_support/cmake/custom.cmake
index c87e78d23..0572e19f6 100644
--- a/lvgl/env_support/cmake/custom.cmake
+++ b/lvgl/env_support/cmake/custom.cmake
@@ -86,7 +86,7 @@ if(NOT "${ret}" STREQUAL "0")
endif()
# This will set all CONFIG_LV_USE_* variables in cmake
-include(${CMAKE_BINARY_DIR}/lv_conf.cmake)
+include(${CMAKE_BINARY_DIR}/lvgl/lv_conf.cmake)
# Add definition of LV_CONF_PATH only if needed
# Do not redefine it if already defined in tests/CMakeLists.txt
diff --git a/src/lib/display_backends/fbdev.c b/src/lib/display_backends/fbdev.c
index 500e0c9..f980cbd 100644
--- a/src/lib/display_backends/fbdev.c
+++ b/src/lib/display_backends/fbdev.c
@@ -20,7 +20,7 @@
#include <stdbool.h>
#include "lvgl/lvgl.h"
-#if LV_USE_FBDEV
+#if LV_USE_FBDEV || LV_USE_LINUX_FBDEV
#include "simulator_util.h"
#include "backends.h"
パッチをあてる
patch -p1 < sdl2.patch
build
make
実行
./build/bin/main
修正と確認
src/main.cを修正することで
exampleなども表示出来る
公式のSimple windowを表示したい場合の差分
diff --git a/src/main.c b/src/main.c
index 90909d0..ce0e33a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -124,6 +124,8 @@ static void configure_simulator(int argc, char **argv)
}
}
+extern void lv_example_win_1(void);
+
/**
* @brief entry point
* @description start a demo
@@ -151,8 +153,9 @@ int main(int argc, char **argv)
#endif
/*Create a Demo*/
- lv_demo_widgets();
- lv_demo_widgets_start_slideshow();
+ lv_example_win_1();
+// lv_demo_widgets();
+// lv_demo_widgets_start_slideshow();
/* Enter the run loop of the selected backend */
driver_backends_run_loop();
もう一回 make 打って build/bin/main 実行すると
こんな感じで表示される
