add LittlevGL demo

add LittlevGL demo on stm32f746 discovery board

components/gui/LittlevGL/3rdparty/lv_ex_conf.h

@@ -0,0 +1,60 @@
+/**
+ * @file lv_ex_conf.h
+ *
+ */
+/*
+ * COPY THIS FILE AS lv_ex_conf.h
+ */
+
+#if 1 /*Set it to "1" to enable the content*/
+
+#ifndef LV_EX_CONF_H
+#define LV_EX_CONF_H
+
+/*******************
+ * GENERAL SETTING
+ *******************/
+#define LV_EX_PRINTF       0       /*Enable printf-ing data*/
+#define LV_EX_KEYBOARD     0       /*Add PC keyboard support to some examples (`lv_drivers` repository is required)*/
+#define LV_EX_MOUSEWHEEL   0       /*Add 'encoder' (mouse wheel) support to some examples (`lv_drivers` repository is required)*/
+
+/*******************
+ *   TEST USAGE
+ *******************/
+#define LV_USE_TESTS        0
+
+/*******************
+ * TUTORIAL USAGE
+ *******************/
+#define LV_USE_TUTORIALS   0
+
+
+/*********************
+ * APPLICATION USAGE
+ *********************/
+
+/* Test the graphical performance of your MCU
+ * with different settings*/
+#define LV_USE_BENCHMARK   0
+
+/*A demo application with Keyboard, Text area, List and Chart
+ * placed on Tab view */
+#define LV_USE_DEMO        1
+#if LV_USE_DEMO
+#define LV_DEMO_WALLPAPER  1    /*Create a wallpaper too*/
+#define LV_DEMO_SLIDE_SHOW 0    /*Automatically switch between tabs*/
+#endif
+
+/*MCU and memory usage monitoring*/
+#define LV_USE_SYSMON      0
+
+/*A terminal to display received characters*/
+#define LV_USE_TERMINAL    0
+
+/*Touch pad calibration with 4 points*/
+#define LV_USE_TPCAL       0
+
+#endif /*LV_EX_CONF_H*/
+
+#endif /*End of "Content enable"*/
+