Don't copy header outside of LVGL, export LVGL, add README, fix example

examples/lvgldemo/Makefile

@@ -86,11 +86,8 @@ endif
 
 MAINSRC = lvgldemo.c
 
-LVGL_SRC_DIR=$(APPDIR)/graphics/lvgl/lvgl
-LVGL_DIR=$(APPDIR)/graphics/lvgl
-
-CFLAGS   += ${shell $(INCDIR) "$(CC)" "$(LVGL_SRC_DIR)" "$(LVGL_DIR)"}
-CXXFLAGS += ${shell $(INCDIR) "$(CC)" "$(LVGL_SRC_DIR)" "$(LVGL_DIR)"}
+CFLAGS += ${shell $(DEFINE) "$(CC)" LV_LVGL_H_INCLUDE_SIMPLE}
+CXXFLAGS += ${shell $(DEFINE) "$(CC)" LV_LVGL_H_INCLUDE_SIMPLE}
 
 $(LVGL_EXAMPLES_TARBALL):
 	@echo "Downloading: $(LVGL_EXAMPLES_TARBALL)"

examples/lvgldemo/fbdev.h

@@ -41,7 +41,7 @@
  ****************************************************************************/
 
 #include <stdint.h>
-#include <graphics/lvgl.h>
+#include <lvgl/lvgl.h>
 
 #ifdef __cplusplus
 extern "C"

examples/lvgldemo/lvgldemo.c

@@ -46,7 +46,7 @@
 #include <pthread.h>
 #include <time.h>
 
-#include <graphics/lvgl.h>
+#include <lvgl/lvgl.h>
 
 #include "fbdev.h"
 #include "tp.h"

examples/lvgldemo/tp.h

@@ -41,7 +41,7 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
-#include <graphics/lvgl.h>
+#include <lvgl/lvgl.h>
 
 /****************************************************************************
  * Pre-processor Definitions

examples/lvgldemo/tp_cal.c

@@ -39,7 +39,7 @@
 
 #include <stdio.h>
 
-#include <graphics/lvgl.h>
+#include <lvgl/lvgl.h>
 #include "tp.h"
 
 /****************************************************************************

graphics/lvgl/Make.defs

@@ -35,4 +35,14 @@
 
 ifeq ($(CONFIG_GRAPHICS_LVGL),y)
 CONFIGURED_APPS += $(APPDIR)/graphics/lvgl
+
+# It allows `<lvgl/lvgl.h>` import.
+
+CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(APPDIR)/graphics/lvgl}
+CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(APPDIR)/graphics/lvgl}
+
+# It allows `<lvgl.h>` import.
+
+CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(APPDIR)/graphics/lvgl/lvgl}
+CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(APPDIR)/graphics/lvgl/lvgl}
 endif

graphics/lvgl/Makefile

@@ -66,8 +66,6 @@ UNPACK ?= unzip -o
 
 LVGL_UNPACKDIR =  $(WD)/$(LVGL_UNPACKNAME)
 
-CFLAGS += ${shell $(INCDIR) "$(CC)" $(APPDIR)/graphics/lvgl}
-
 $(LVGL_TARBALL):
 	@echo "Downloading: $(LVGL_TARBALL)"
 	$(Q) $(WGET) $(CONFIG_GRAPH_LVGL_URL)/$(LVGL_TARBALL)
@@ -78,13 +76,7 @@ $(LVGL_UNPACKNAME): $(LVGL_TARBALL)
 	$(Q) mv	lvgl-$(LVGL_VERSION) $(LVGL_UNPACKNAME)
 	$(Q) touch $(LVGL_UNPACKNAME)
 
-lvgl/lvgl.h: $(LVGL_UNPACKNAME)
-
-$(APPDIR)/include/graphics/lvgl.h: lvgl/lvgl.h
-	@echo "CP: lvgl/lvgl.h"
-	$(Q) cp lvgl/lvgl.h $(APPDIR)/include/graphics/lvgl.h
-
-context:: $(LVGL_UNPACKNAME) $(APPDIR)/include/graphics/lvgl.h
+context:: $(LVGL_UNPACKNAME)
 
 clean::
 	$(call DELDIR, build)
@@ -92,6 +84,5 @@ clean::
 distclean::
 	$(call DELDIR, $(LVGL_UNPACKNAME))
 	$(call DELFILE, $(LVGL_TARBALL))
-	$(call DELFILE, $(APPDIR)/include/graphics/lvgl.h)
 
 include $(APPDIR)/Application.mk

graphics/lvgl/README.md

@@ -0,0 +1,21 @@
+# Usage
+
+Import with `#include <lvgl/lvgl.h>` or `#include <lvgl.h>`.
+
+Upstream example ported to NuttX is present at `examples/lvgldemo`.
+
+LVGL can be used with framebuffer device. To find example boards with this
+preconfigured, search for `CONFIG_GRAPHICS_LVGL=y` in `defconfig` files.
+All of them have also `CONFIG_VIDEO_FB=y` present.
+
+As a second option, LVGL can talk to a display driver and explicitly draw line by line.
+For this case, there is no preconfigured board present. Go to _Porting_ section
+of upstream documentation for more hints.
+
+# Resources
+
+* [API documentation with examples](https://docs.lvgl.io/latest/en/html/index.html)
+* [GitHub / LVGL / LVGL library](https://github.com/lvgl/lvgl)
+* [GitHub / LVGL / Examples, tutorials, applications](https://github.com/lvgl/lv_examples)
+* [GitHub / LVGL / Desktop simulator](https://github.com/lvgl/lv_sim_eclipse_sdl)
+* [GitHub / LVGL / Web simulator](https://github.com/lvgl/lv_sim_emscripten)

include/graphics/.gitignore

@@ -1 +0,0 @@
-/lvgl.h