Support building as micropython USER_C_MODULE.

bindings.cmake

@@ -8,7 +8,10 @@ include(${LVGL_DIR}/CMakeLists.txt)
 # lvgl bindings target (the mpy module)
 add_library(usermod_lv_bindings INTERFACE)
 target_sources(usermod_lv_bindings INTERFACE ${LV_SRC})
-target_include_directories(usermod_lv_bindings INTERFACE ${LV_INCLUDE})
+target_include_directories(usermod_lv_bindings INTERFACE
+    ${CMAKE_CURRENT_LIST_DIR}/include
+    ${LV_INCLUDE}
+)
 
 target_link_libraries(usermod_lv_bindings INTERFACE lvgl_interface)
 

manifest.py

@@ -0,0 +1,22 @@
+import sys
+
+include("$(MPY_DIR)/extmod/asyncio")
+
+freeze("lib", (
+    "display_driver.py",
+    "display_driver_utils.py",
+    "fs_driver.py",
+    "lv_colors.py",
+    "lv_utils.py",
+    "tpcal.py",
+    "utils.py",
+), opt=0)
+
+require("aiorepl")
+
+if sys.platform in ("linux"):
+    freeze("driver/linux", (
+        "evdev.py",
+        "lv_timer.py",
+    ), opt=1)
+

micropython.cmake

@@ -0,0 +1,8 @@
+# For detauils see: https://docs.micropython.org/en/latest/develop/cmodules.html
+
+set(LVGL_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+include(${CMAKE_CURRENT_LIST_DIR}/env_support/cmake/micropython.cmake)
+
+# Link our INTERFACE library to the usermod target.
+target_link_libraries(usermod INTERFACE lvgl_interface)

micropython.mk

@@ -0,0 +1,103 @@
+################################################################################
+# LVGL build rules for ports based on Makefile
+
+# For details see: https://docs.micropython.org/en/latest/develop/cmodules.html
+
+LVGL_BINDING_DIR := $(USERMOD_DIR)
+
+LVGL_DIR = $(LVGL_BINDING_DIR)/lvgl
+LVGL_GENERIC_DRV_DIR = $(LVGL_BINDING_DIR)/driver/generic
+
+ifeq ($(wildcard $(LVGL_DIR)/.),,)
+$(info lvgl submodule not init)
+else
+# This listing of all lvgl src files is used by make to track when the bindings need to be regenerated
+ALL_LVGL_SRC = $(shell find $(LVGL_DIR) -type f -name '*.h') $(LVGL_BINDING_DIR)/lv_conf.h
+endif
+
+LVGL_PP = $(BUILD)/lvgl/lvgl.pp.c
+LVGL_MPY = $(BUILD)/lvgl/lv_mpy.c
+LVGL_MPY_METADATA = $(BUILD)/lvgl/lv_mpy.json
+QSTR_GLOBAL_DEPENDENCIES += $(LVGL_MPY)
+INC += -I$(LVGL_BINDING_DIR) -I$(LVGL_BINDING_DIR)/include -I$(LVGL_DIR)/src
+CFLAGS_USERMOD += $(INC) $(LV_CFLAGS)
+
+ifneq ($(MICROPY_FLOAT_IMPL),double)
+# Tiny TTF library needs a number of math.h double functions
+CFLAGS_USERMOD += -DLV_USE_TINY_TTF=0
+endif
+
+# chain lvgl submodule check off the micropython submodules rule.
+LVGL_SUBMODULES = lvgl pycparser
+submodules: lvgl_submodule
+lvgl_submodule:
+	$(ECHO) "Updating submodules: $(LVGL_SUBMODULES)"
+	$(Q)cd $(LVGL_BINDING_DIR) && git submodule sync $(LVGL_SUBMODULES)
+	$(Q)cd $(LVGL_BINDING_DIR) && git submodule update --init $(LVGL_SUBMODULES)
+.PHONY: lvgl_submodule
+
+# Generate the main micropython bindings library
+$(LVGL_MPY): $(ALL_LVGL_SRC) $(LVGL_BINDING_DIR)/gen/gen_mpy.py
+	$(ECHO) "LVGL-GEN $@"
+	$(Q)mkdir -p $(dir $@)
+	$(Q)$(CPP) $(CFLAGS_USERMOD) -DPYCPARSER -x c -I $(LVGL_BINDING_DIR)/pycparser/utils/fake_libc_include $(INC) $(LVGL_DIR)/lvgl.h > $(LVGL_PP)
+	$(Q)$(PYTHON) $(LVGL_BINDING_DIR)/gen/gen_mpy.py -M lvgl -MP lv -MD $(LVGL_MPY_METADATA) -E $(LVGL_PP) $(LVGL_DIR)/lvgl.h > $@
+
+# Add all lvgl source files to the module.
+SRC_USERMOD += $(shell find $(LVGL_DIR)/src $(LVGL_DIR)/examples $(LVGL_GENERIC_DRV_DIR) -type f -name "*.c")
+SRC_USERMOD += $(LVGL_MPY)
+
+CFLAGS_USERMOD += -Wno-unused-function
+
+FROZEN_MANIFEST += $(LVGL_BINDING_DIR)/manifest.py
+
+################################################################################
+# Per-port Support 
+
+MICROPY_PORT = $(notdir $(CURDIR))
+
+ifeq ($(MICROPY_PORT),unix)
+# This section only included when building the micropython unix port
+UNAME_S := $(shell uname -s)
+
+ifneq ($(UNAME_S),Darwin)
+# On macos enable framebuffer support
+CFLAGS_USERMOD += -DMICROPY_FB=1
+endif
+
+ifneq (,$(shell which pkg-config))
+# Linux Support: if pkg-config is installed use it to 
+# check for and use optional libraries
+
+SDL_CFLAGS_USERMOD :=  $(shell pkg-config --silence-errors --cflags sdl2)
+SDL_LDFLAGS_USERMOD := $(shell pkg-config --silence-errors --libs   sdl2)
+ifneq ($(SDL_LDFLAGS_USERMOD),)
+CFLAGS_USERMOD += $(SDL_CFLAGS_USERMOD) -DMICROPY_SDL=1
+LDFLAGS_USERMOD += $(SDL_LDFLAGS_USERMOD)
+endif
+
+RLOTTIE_CFLAGS_USERMOD :=  $(shell pkg-config --silence-errors --cflags rlottie)
+RLOTTIE_LDFLAGS_USERMOD := $(shell pkg-config --silence-errors --libs   rlottie)
+ifneq ($(RLOTTIE_LDFLAGS_USERMOD),)
+CFLAGS_USERMOD += $(RLOTTIE_CFLAGS_USERMOD) -DMICROPY_RLOTTIE=1
+LDFLAGS_USERMOD += $(RLOTTIE_LDFLAGS_USERMOD)
+endif
+
+FREETYPE_CFLAGS_USERMOD :=  $(shell pkg-config --silence-errors --cflags freetype2)
+FREETYPE_LDFLAGS_USERMOD := $(shell pkg-config --silence-errors --libs   freetype2)
+ifneq ($(FREETYPE_LDFLAGS_USERMOD),)
+CFLAGS_USERMOD += $(FREETYPE_CFLAGS_USERMOD) -DMICROPY_FREETYPE=1
+LDFLAGS_USERMOD += $(FREETYPE_LDFLAGS_USERMOD)
+endif
+
+FFMPEG_LIBS := libavformat libavcodec libswscale libavutil
+FFMPEG_CFLAGS_USERMOD :=  $(shell pkg-config --silence-errors --cflags $(FFMPEG_LIBS))
+FFMPEG_LDFLAGS_USERMOD := $(shell pkg-config --silence-errors --libs   $(FFMPEG_LIBS))
+ifneq ($(FFMPEG_LDFLAGS_USERMOD),)
+CFLAGS_USERMOD += $(FFMPEG_CFLAGS_USERMOD) -DMICROPY_FFMPEG=1
+LDFLAGS_USERMOD += $(FFMPEG_LDFLAGS_USERMOD)
+endif
+
+endif  # Linux
+
+endif  # unix port