cmake: add lvgl cmake support

Signed-off-by: Neo Xu <neo.xu1990@gmail.com>

examples/lvgldemo/CMakeLists.txt

@@ -28,6 +28,8 @@ if(CONFIG_EXAMPLES_LVGLDEMO)
     ${CONFIG_EXAMPLES_LVGLDEMO_STACKSIZE}
     MODULE
     ${CONFIG_EXAMPLES_LVGLDEMO}
+    DEPENDS
+    lvgl_nuttx
     SRCS
     lvgldemo.c)
 endif()

graphics/CMakeLists.txt

@@ -17,5 +17,6 @@
 # the License.
 #
 # ##############################################################################
+nuttx_add_subdirectory()
 
 nuttx_generate_kconfig(MENUDESC "Graphics Support")

graphics/lvgl/CMakeLists.txt

@@ -0,0 +1,148 @@
+# ##############################################################################
+# apps/graphics/lvgl/CMakeLists.txt
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_GRAPHICS_LVGL)
+
+  # ############################################################################
+  # Config and Fetch lvgl
+  # ############################################################################
+  set(LVGL_DIR ${CMAKE_CURRENT_LIST_DIR}/lvgl)
+
+  if(NOT EXISTS ${LVGL_DIR})
+    FetchContent_Declare(
+      lvgl_fetch
+      DOWNLOAD_DIR ${CMAKE_CURRENT_LIST_DIR}
+      URL "https://github.com/lvgl/lvgl/archive/refs/tags/v${CONFIG_LVGL_VERSION}.zip"
+          SOURCE_DIR
+          ${CMAKE_CURRENT_LIST_DIR}/lvgl
+          BINARY_DIR
+          ${CMAKE_BINARY_DIR}/apps/graphics/lvgl/lvgl
+          CONFIGURE_COMMAND
+          ""
+          BUILD_COMMAND
+          ""
+          INSTALL_COMMAND
+          ""
+          TEST_COMMAND
+          ""
+      DOWNLOAD_NO_PROGRESS true
+      TIMEOUT 30)
+
+    FetchContent_GetProperties(lvgl_fetch)
+
+    if(NOT lvgl_fetch_POPULATED)
+      FetchContent_Populate(lvgl_fetch)
+    endif()
+  endif()
+
+  # ############################################################################
+  # Flags and Sources
+  # ############################################################################
+
+  # Relax LVGL's format checking and unused variable checking to avoid errors
+
+  set(CFLAGS -Wno-format -Wno-format-security -Wno-unused-variable)
+
+  # Since this change is only merged into the lvgl.v9, let us workaround for v8
+  # ./lvgl/src/core/lv_obj.c:363:25: warning: variable 'x' set but not used
+  # [-Wunused-but-set-variable] 363 |         static uint32_t x = 0; | ^ 1
+  # warning generated.
+
+  list(APPEND CFLAGS -Wno-unused-but-set-variable)
+
+  set(CSRCS port/lv_port.c port/lv_port_tick.c)
+
+  if(CONFIG_LIBUV)
+    list(APPEND CSRCS port/lv_port_libuv.c)
+  endif()
+
+  if(CONFIG_LV_PORT_USE_LCDDEV)
+    list(APPEND CSRCS port/lv_port_lcddev.c)
+  endif()
+
+  if(CONFIG_LV_PORT_USE_FBDEV)
+    list(APPEND CSRCS port/lv_port_fbdev.c)
+  endif()
+
+  if(CONFIG_LV_PORT_USE_TOUCHPAD)
+    list(APPEND CSRCS port/lv_port_touchpad.c)
+  endif()
+
+  if(CONFIG_LV_PORT_USE_BUTTON)
+    list(APPEND CSRCS port/lv_port_button.c)
+  endif()
+
+  if(CONFIG_LV_PORT_USE_KEYPAD)
+    list(APPEND CSRCS port/lv_port_keypad.c)
+  endif()
+
+  if(CONFIG_LV_PORT_USE_ENCODER)
+    list(APPEND CSRCS port/lv_port_encoder.c)
+  endif()
+
+  if(CONFIG_LV_USE_LOG)
+    list(APPEND CSRCS port/lv_port_syslog.c)
+  endif()
+
+  if(CONFIG_LIBUV)
+    list(APPEND CSRCS port/lv_port_libuv.c)
+  endif()
+
+  if(CONFIG_LIBUV)
+    list(APPEND CSRCS port/lv_port_libuv.c)
+  endif()
+
+  if(CONFIG_LIBUV)
+    list(APPEND CSRCS port/lv_port_libuv.c)
+  endif()
+
+  if(CONFIG_LV_MEM_CUSTOM)
+    if(NOT CONFIG_LV_PORT_MEM_CUSTOM_SIZE EQUAL 0)
+      list(APPEND CFLAGS -DLV_MEM_CUSTOM_ALLOC=lv_port_mem_alloc)
+      list(APPEND CFLAGS -DLV_MEM_CUSTOM_FREE=lv_port_mem_free)
+      list(APPEND CFLAGS -DLV_MEM_CUSTOM_REALLOC=lv_port_mem_realloc)
+      list(APPEND CSRCS port/lv_port_mem.c)
+    endif()
+  endif()
+
+  # ############################################################################
+  # Library Configuration
+  # ############################################################################
+
+  set(INCDIR ${CMAKE_CURRENT_LIST_DIR} ${NUTTX_DIR}/include)
+
+  add_subdirectory(${LVGL_DIR})
+  nuttx_add_external_library(lvgl)
+  nuttx_add_external_library(lvgl_demos)
+  nuttx_add_external_library(lvgl_examples)
+
+  target_include_directories(lvgl PRIVATE ${INCDIR})
+  target_compile_options(lvgl PRIVATE ${CFLAGS})
+  if(NOT CONFIG_LV_ASSERT_HANDLER_INCLUDE STREQUAL "")
+    target_compile_definitions(lvgl PRIVATE "LV_ASSERT_HANDLER=ASSERT(0)\;")
+  endif()
+
+  nuttx_add_library(lvgl_nuttx)
+  target_sources(lvgl_nuttx PRIVATE ${CSRCS})
+  target_link_libraries(lvgl_nuttx lvgl)
+
+  # allow to include via lvgl/lvgl.h
+  target_include_directories(lvgl_nuttx PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+endif()