hello_world example added and encoder_ctrl begun

lv_examples/1_1_lv_hello_world/lv_hello_world.c

@@ -0,0 +1,67 @@
+/**
+ * @file lv_hello_world.c
+ *
+ */
+
+/*
+ * Greetings,
+ * this is the first example in the tutorial hence this is the most simple one.
+ * It only creates a Label, set its text, and align to the middle.
+ *
+ * Be sure in lv_conf.h LV_APP_ENEBLE is 0 (just for simplicity)
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_hello_world.h"
+#if USE_LV_EXAMPLE != 0
+
+#include "lvgl/lvgl.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Create a simple 'Hello world!' label
+ */
+void lv_hello_world_init(void)
+{
+    /*Create a Label on the current screen*/
+    lv_obj_t * label1 =  lv_label_create(lv_scr_act(), NULL);
+
+    /*Modify the Label's text*/
+    lv_label_set_text(label1, "Hello world!");
+
+    /* Align the Label to the center
+     * NULL means align on parent (which is the screen now)
+     * 0, 0 at the and means an x, y offset after alignment*/
+    lv_obj_align_us(label1, NULL, LV_ALIGN_CENTER, 0, 0);
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+#endif /*USE_LV_EXAMPLE != 0*/

lv_examples/1_1_lv_hello_world/lv_hello_world.h

@@ -0,0 +1,42 @@
+/**
+ * @file lv_hello_world.h
+ *
+ */
+
+#ifndef LV_HELLO_WORLD_H
+#define LV_HELLO_WORLD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "lv_conf.h"
+#if USE_LV_EXAMPLE != 0
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_hello_world_init(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif /*USE_LV_EXAMPLE != 0*/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_HELLO_WORLD_H*/