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90 lines
3.8 KiB
Markdown
90 lines
3.8 KiB
Markdown
2 years ago
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# CMake
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LVGL supports integrating with [CMake](https://cmake.org/). It comes with preconfigured targets for:
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- [Espressif (ESP32)](https://docs.espressif.com/projects/esp-idf/en/v3.3/get-started-cmake/index.html)
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- [MicroPython](https://docs.micropython.org/en/v1.15/develop/cmodules.html)
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- [Zephyr](https://docs.zephyrproject.org/latest/guides/zephyr_cmake_package.html)
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On top of the preconfigured targets you can also use "plain" CMake to integrate LVGL into any custom C/C++ project.
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### Prerequisites
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- CMake ( >= 3.12.4 )
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- Compatible build tool e.g.
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- [Make](https://www.gnu.org/software/make/)
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- [Ninja](https://ninja-build.org/)
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## Building LVGL with CMake
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There are many ways to include external CMake projects into your own. A modern one also used in this example is the CMake [FetchContent](https://cmake.org/cmake/help/latest/module/FetchContent.html) module. This module conveniently allows us to download dependencies directly at configure time from e.g. [GitHub](https://github.com/). Here is an example how we might include LVGL into our own project.
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```cmake
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cmake_minimum_required(VERSION 3.14)
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include(FetchContent)
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project(MyProject LANGUAGES C CXX)
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# Build an executable called "MyFirmware"
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add_executable(MyFirmware src/main.c)
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# Specify path to own LVGL config header
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set(LV_CONF_PATH
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${CMAKE_CURRENT_SOURCE_DIR}/src/lv_conf.h
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CACHE STRING "" FORCE)
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# Fetch LVGL from GitHub
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FetchContent_Declare(lvgl URL https://github.com/lvgl/lvgl.git)
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FetchContent_MakeAvailable(lvgl)
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# The target "MyFirmware" depends on LVGL
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target_link_libraries(MyFirmware PRIVATE lvgl::lvgl)
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```
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This configuration declares a dependency between the two targets **MyFirmware** and **lvgl**. Upon building the target **MyFirmware** this dependency will be resolved and **lvgl** will be built and linked with it. Since LVGL requires a config header called [lv_conf.h](https://github.com/lvgl/lvgl/blob/master/lv_conf_template.h) to be includable by its sources we also set the option `LV_CONF_PATH` to point to our own copy of it.
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### Additional CMake options
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Besides `LV_CONF_PATH` there are two additional CMake options to specify include paths.
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`LV_LVGL_H_INCLUDE_SIMPLE` which specifies whether to `#include "lvgl.h"` absolut or relative
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| ON (default) | OFF |
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| ------------ | -------------- |
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| "lvgl.h" | "../../lvgl.h" |
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`LV_CONF_INCLUDE_SIMPLE` which specifies whether to `#include "lv_conf.h"` and `"lv_drv_conf.h"` absolut or relative
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| ON (default) | OFF |
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| --------------- | --------------------- |
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| "lv_conf.h" | "../../lv_conf.h" |
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| "lv_drv_conf.h" | "../../lv_drv_conf.h" |
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I do not recommend disabling those options unless your folder layout makes it absolutely necessary.
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## Building LVGL examples with CMake
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LVGL [examples](https://docs.lvgl.io/master/examples.html) have their own CMake target. If you want to build the examples simply add them to your dependencies.
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```cmake
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# The target "MyFirmware" depends on LVGL and examples
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target_link_libraries(MyFirmware PRIVATE lvgl::lvgl lvgl::examples)
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```
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## Building LVGL drivers and demos with CMake
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Exactly the same goes for the [drivers](https://github.com/lvgl/lv_drivers) and the [demos](https://github.com/lvgl/lvgl/demos).
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```cmake
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FetchContent_Declare(lv_drivers
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GIT_REPOSITORY https://github.com/lvgl/lv_drivers)
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FetchContent_MakeAvailable(lv_drivers)
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# The target "MyFirmware" depends on LVGL, drivers and demos
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target_link_libraries(MyFirmware PRIVATE lvgl::lvgl lvgl::drivers lvgl::examples)
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```
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# Build shared libraries with CMake
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By default, LVGL will be built as a static library (archive). CMake can instead be instructed to build LVGL as shared library (.so/.dll/etc.):
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```cmake
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set(BUILD_SHARED_LIBS ON)
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```
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OR
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```
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$ cmake "-DBUILD_SHARED_LIBS=ON" .
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```
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