LVGL: Open-source Embedded GUI Library (#669)

* Add lvgl as main component

* update dev5.2 lvgl branch

* update lvgl 5.2 +update example + update configuration

* Update submodule and example

* update lv_drivers (fix) and example

* fix problem when merge

lvgl/component.mk

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+# Component makefile for lvgl/lvgl
+
+# expected anyone using this driver includes it as 'lvgl/lvgl.h'
+INC_DIRS += $(lvgl_ROOT)
+
+# args for passing into compile rule generation
+lvgl_SRC_DIR = $(lvgl_ROOT) \
+        $(lvgl_ROOT)/lvgl \
+	$(lvgl_ROOT)/lvgl/lv_core \
+	$(lvgl_ROOT)/lvgl/lv_draw \
+	$(lvgl_ROOT)/lvgl/lv_hal \
+	$(lvgl_ROOT)/lvgl/lv_misc \
+	$(lvgl_ROOT)/lvgl/lv_fonts \
+	$(lvgl_ROOT)/lvgl/lv_objx \
+	$(lvgl_ROOT)/lvgl/lv_themes \
+	$(lvgl_ROOT)/lv_drivers/display \
+	$(lvgl_ROOT)/lv_drivers/indev
+
+LVGL_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
+
+#EXTRA_CFLAGS += -DLV_CONF_INCLUDE_SIMPLE=1
+
+#include $(LVGL_DIR)defaults.mk
+#
+#fonts_CFLAGS = $(CFLAGS) \
+	-DLV_HOR_RES=$(LV_HOR_RES) \
+	-DLV_VER_RES=$(LV_VER_RES) \
+	-DLV_DPI=$(LV_DPI) \
+	-DLV_VDB_SIZE=$(LV_VDB_SIZE) \
+	-DLV_VDB_ADR=$(LV_VDB_ADR) \
+	-DLV_VDB_DOUBLE=$(LV_VDB_DOUBLE) \
+	-DLV_VDB2_ADR=$(LV_VDB2_ADR) \
+	-DLV_ANTIALIAS=$(LV_ANTIALIAS) \
+	-DLV_FONT_ANTIALIAS=$(LV_FONT_ANTIALIAS) \
+	-DLV_REFR_PERIOD=$(LV_REFR_PERIOD)
+
+$(eval $(call component_compile_rules,lvgl))

lvgl/lv_conf.h

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+
+/* Use the defaults for everything else */
+#include_next <lv_conf.h>

lvgl/lv_drivers

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+Subproject commit 8fe0804ceb875193a37106a2e25d07c106650a86

lvgl/lv_drv_conf.h

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+
+/* Use the defaults for everything else */
+#include_next <lv_drv_conf.h>

lvgl/lv_examples

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+Subproject commit c3afbc9819f5492a7fe7e7e18a37df95fb60f449

lvgl/lvgl

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+Subproject commit 41695bf9ac758ae3276424e06308e1bb89c4c019