diff --git a/lv_conf_template.h b/lv_conf_template.h
index f1f06fe07b..14424ba353 100644
--- a/lv_conf_template.h
+++ b/lv_conf_template.h
@@ -196,6 +196,12 @@ typedef void * lv_img_decoder_user_data_t;
  * font's bitmaps */
 #define LV_ATTRIBUTE_LARGE_CONST
 
+/* Export integer constant to binding.
+ * This macro is used with constants in the form of LV_<CONST> that
+ * should also appear on lvgl binding API such as Micropython
+ */
+#define LV_EXPORT_CONST_INT(int_value)
+
 /*===================
  *  HAL settings
  *==================*/
diff --git a/scripts/lv_conf_checker.py b/scripts/lv_conf_checker.py
old mode 100644
new mode 100755
index 7929dcf527..c2171ff8a9
--- a/scripts/lv_conf_checker.py
+++ b/scripts/lv_conf_checker.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3.6
+
 '''
 Generates a checker file for lv_conf.h from lv_conf_templ.h define all the not defined values
 '''
@@ -34,9 +36,11 @@ for i in fin.read().splitlines():
   if '/*--END OF LV_CONF_H--*/' in i: break
 
   r = re.search(r'^ *# *define ([^\s]+).*$', i)
+  
   if r:
+    line = re.sub('\(.*?\)', '', r[1], 1)    #remove parentheses from macros
     fout.write(
-      f'#ifndef {r[1]}\n'
+      f'#ifndef {line}\n'
       f'{i}\n'
       '#endif\n'
     )
diff --git a/src/lv_conf_checker.h b/src/lv_conf_checker.h
index 7accfd2596..d7edb6dffa 100644
--- a/src/lv_conf_checker.h
+++ b/src/lv_conf_checker.h
@@ -266,6 +266,14 @@
 #define LV_ATTRIBUTE_LARGE_CONST
 #endif
 
+/* Export integer constant to binding.
+ * This macro is used with constants in the form of LV_<CONST> that
+ * should also appear on lvgl binding API such as Micropython
+ */
+#ifndef LV_EXPORT_CONST_INT
+#define LV_EXPORT_CONST_INT(int_value)
+#endif
+
 /*===================
  *  HAL settings
  *==================*/
diff --git a/src/lv_core/lv_core.mk b/src/lv_core/lv_core.mk
index 5cd51bfb58..eb1c5e0ca9 100644
--- a/src/lv_core/lv_core.mk
+++ b/src/lv_core/lv_core.mk
@@ -4,6 +4,7 @@ CSRCS += lv_disp.c
 CSRCS += lv_obj.c
 CSRCS += lv_refr.c
 CSRCS += lv_style.c
+CSRCS += lv_debug.c
 
 DEPPATH += --dep-path $(LVGL_DIR)/lvgl/src/lv_core
 VPATH += :$(LVGL_DIR)/lvgl/src/lv_core
diff --git a/src/lv_core/lv_style.h b/src/lv_core/lv_style.h
index 0055529def..a334a4a5e8 100644
--- a/src/lv_core/lv_style.h
+++ b/src/lv_core/lv_style.h
@@ -25,6 +25,8 @@ extern "C" {
 #define LV_RADIUS_CIRCLE (LV_COORD_MAX) /**< A very big radius to always draw as circle*/
 #define LV_STYLE_DEGUG_SENTINEL_VALUE 0x12345678
 
+LV_EXPORT_CONST_INT(LV_RADIUS_CIRCLE);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_font/lv_font_fmt_txt.h b/src/lv_font/lv_font_fmt_txt.h
index 0fd41347bb..b7efcb3d57 100644
--- a/src/lv_font/lv_font_fmt_txt.h
+++ b/src/lv_font/lv_font_fmt_txt.h
@@ -45,7 +45,7 @@ typedef struct
     uint8_t box_w;                  /**< Width of the glyph's bounding box*/
     uint8_t box_h;                  /**< Height of the glyph's bounding box*/
     int8_t ofs_x;                   /**< x offset of the bounding box*/
-    uint8_t ofs_y;                  /**< y offset of the bounding box. Measured from the top of the line*/
+    int8_t ofs_y;                  /**< y offset of the bounding box. Measured from the top of the line*/
 }lv_font_fmt_txt_glyph_dsc_t;
 
 
@@ -141,7 +141,7 @@ typedef struct {
           3. value = class_pair_values[(left_class-1)*right_class_cnt + (righ_class-1)]
         */
 
-    const uint8_t * class_pair_values;    /*left_class_num * right_class_num value*/
+    const int8_t * class_pair_values;    /*left_class_num * right_class_num value*/
     const uint8_t * left_class_mapping;   /*Map the glyph_ids to classes: index -> glyph_id -> class_id*/
     const uint8_t * right_class_mapping;  /*Map the glyph_ids to classes: index -> glyph_id -> class_id*/
     uint8_t left_class_cnt;
diff --git a/src/lv_font/lv_font_roboto_12.c b/src/lv_font/lv_font_roboto_12.c
index b201120d1e..ac78094392 100644
--- a/src/lv_font/lv_font_roboto_12.c
+++ b/src/lv_font/lv_font_roboto_12.c
@@ -1,4 +1,4 @@
-#include "lvgl/lvgl.h"
+#include "../../lvgl.h"
 
 /*******************************************************************************
  * Size: 12 px
diff --git a/src/lv_font/lv_font_roboto_16.c b/src/lv_font/lv_font_roboto_16.c
index a8df9c3a05..859a3d504a 100644
--- a/src/lv_font/lv_font_roboto_16.c
+++ b/src/lv_font/lv_font_roboto_16.c
@@ -1,4 +1,4 @@
-#include "lvgl/lvgl.h"
+#include "../../lvgl.h"
 
 /*******************************************************************************
  * Size: 16 px
diff --git a/src/lv_font/lv_font_roboto_22.c b/src/lv_font/lv_font_roboto_22.c
index 4e33b05d11..d85712c6ea 100644
--- a/src/lv_font/lv_font_roboto_22.c
+++ b/src/lv_font/lv_font_roboto_22.c
@@ -1,4 +1,4 @@
-#include "lvgl/lvgl.h"
+#include "../../lvgl.h"
 
 /*******************************************************************************
  * Size: 22 px
diff --git a/src/lv_font/lv_font_roboto_28.c b/src/lv_font/lv_font_roboto_28.c
index a19af47267..66ae045906 100644
--- a/src/lv_font/lv_font_roboto_28.c
+++ b/src/lv_font/lv_font_roboto_28.c
@@ -1,4 +1,4 @@
-#include "lvgl/lvgl.h"
+#include "../../lvgl.h"
 
 /*******************************************************************************
  * Size: 28 px
diff --git a/src/lv_font/lv_font_unscii_8.c b/src/lv_font/lv_font_unscii_8.c
index e86727cf90..1b96823e85 100644
--- a/src/lv_font/lv_font_unscii_8.c
+++ b/src/lv_font/lv_font_unscii_8.c
@@ -311,7 +311,7 @@ static LV_ATTRIBUTE_LARGE_CONST const uint8_t gylph_bitmap[] = {
  *  GLYPH DESCRIPTION
  *--------------------*/
 
-static  lv_font_fmt_txt_glyph_dsc_t glyph_dsc[] = {
+static const lv_font_fmt_txt_glyph_dsc_t glyph_dsc[] = {
     {.bitmap_index = 0, .adv_w = 0, .box_h = 0, .box_w = 0, .ofs_x = 0, .ofs_y = 0} /* id = 0 reserved */,
     {.bitmap_index = 0, .adv_w = 128, .box_h = 0, .box_w = 0, .ofs_x = 0, .ofs_y = 0},
     {.bitmap_index = 0, .adv_w = 128, .box_h = 7, .box_w = 1, .ofs_x = 3, .ofs_y = -1},
@@ -460,4 +460,3 @@ lv_font_t lv_font_unscii_8 = {
 };
 
 #endif /*#if LV_FONT_UNSCII_8*/
-
diff --git a/src/lv_misc/lv_area.h b/src/lv_misc/lv_area.h
index 30b62cbec5..149df23026 100644
--- a/src/lv_misc/lv_area.h
+++ b/src/lv_misc/lv_area.h
@@ -29,6 +29,9 @@ extern "C" {
 #define LV_COORD_MAX ((lv_coord_t)((uint32_t)((uint32_t)1 << (8 * sizeof(lv_coord_t) - 1)) - 1000))
 #define LV_COORD_MIN (-LV_COORD_MAX)
 
+LV_EXPORT_CONST_INT(LV_COORD_MAX);
+LV_EXPORT_CONST_INT(LV_COORD_MIN);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_misc/lv_log.h b/src/lv_misc/lv_log.h
index 6a6c2d2a4b..d85bcde432 100644
--- a/src/lv_misc/lv_log.h
+++ b/src/lv_misc/lv_log.h
@@ -26,13 +26,14 @@ extern "C" {
 
 /*Possible log level. For compatibility declare it independently from `LV_USE_LOG`*/
 
-#define LV_LOG_LEVEL_TRACE 0 /**< A lot of logs to give detailed information*/
-#define LV_LOG_LEVEL_INFO 1  /**< Log important events*/
-#define LV_LOG_LEVEL_WARN 2  /**< Log if something unwanted happened but didn't caused problem*/
-#define LV_LOG_LEVEL_ERROR 3 /**< Only critical issue, when the system may fail*/
-#define LV_LOG_LEVEL_NONE 4 /**< Do not log anything*/
-#define _LV_LOG_LEVEL_NUM 5 /**< Number of log levels */
-
+enum {
+    LV_LOG_LEVEL_TRACE = 0,  /**< A lot of logs to give detailed information*/
+    LV_LOG_LEVEL_INFO  = 1,   /**< Log important events*/
+    LV_LOG_LEVEL_WARN  = 2,   /**< Log if something unwanted happened but didn't caused problem*/
+    LV_LOG_LEVEL_ERROR = 3,  /**< Only critical issue, when the system may fail*/
+    LV_LOG_LEVEL_NONE  = 4,   /**< Do not log anything*/
+    _LV_LOG_LEVEL_NUM  = 5    /**< Number of log levels */
+};
 typedef int8_t lv_log_level_t;
 
 #if LV_USE_LOG
diff --git a/src/lv_objx/lv_bar.h b/src/lv_objx/lv_bar.h
index 14c558e7a7..9ffdbdd62f 100644
--- a/src/lv_objx/lv_bar.h
+++ b/src/lv_objx/lv_bar.h
@@ -43,6 +43,11 @@ extern "C" {
 /** log2(LV_BAR_ANIM_STATE_END) used to normalize data*/
 #define LV_BAR_ANIM_STATE_NORM 8
 
+LV_EXPORT_CONST_INT(LV_BAR_ANIM_STATE_START);
+LV_EXPORT_CONST_INT(LV_BAR_ANIM_STATE_END);
+LV_EXPORT_CONST_INT(LV_BAR_ANIM_STATE_INV);
+LV_EXPORT_CONST_INT(LV_BAR_ANIM_STATE_NORM);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_objx/lv_btnm.h b/src/lv_objx/lv_btnm.h
index bedcdf436d..44bc4efbbf 100644
--- a/src/lv_objx/lv_btnm.h
+++ b/src/lv_objx/lv_btnm.h
@@ -31,6 +31,8 @@ extern "C" {
 #define LV_BTNM_WIDTH_MASK 0x0007
 #define LV_BTNM_BTN_NONE 0xFFFF
 
+LV_EXPORT_CONST_INT(LV_BTNM_BTN_NONE);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_objx/lv_canvas.c b/src/lv_objx/lv_canvas.c
index a39c11a311..855e2bcad0 100644
--- a/src/lv_objx/lv_canvas.c
+++ b/src/lv_objx/lv_canvas.c
@@ -695,11 +695,37 @@ void lv_canvas_draw_line(lv_obj_t * canvas, const lv_point_t * points, uint32_t
     lv_disp_t * refr_ori = lv_refr_get_disp_refreshing();
     lv_refr_set_disp_refreshing(&disp);
 
+    lv_style_t circle_style_tmp; /*If rounded...*/
+    if(style->line.rounded) {
+        lv_style_copy(&circle_style_tmp, style);
+        circle_style_tmp.body.radius     = LV_RADIUS_CIRCLE;
+        circle_style_tmp.body.main_color = style->line.color;
+        circle_style_tmp.body.grad_color = style->line.color;
+        circle_style_tmp.body.opa        = style->line.opa;
+    }
+    lv_area_t circle_area;
     uint32_t i;
     for(i = 0; i < point_cnt - 1; i++) {
         lv_draw_line(&points[i], &points[i + 1], &mask, style, LV_OPA_COVER);
+        
+        /*Draw circle on the joints if enabled*/
+        if(style->line.rounded) {
+            circle_area.x1 = points[i].x - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
+            circle_area.y1 = points[i].y - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
+            circle_area.x2 = points[i].x + ((style->line.width - 1) >> 1);
+            circle_area.y2 = points[i].y + ((style->line.width - 1) >> 1);
+            lv_draw_rect(&circle_area, &mask, &circle_style_tmp, LV_OPA_COVER);
+        }
     }
-
+    /*Draw circle on the last point too if enabled*/
+    if(style->line.rounded) {
+        circle_area.x1 = points[i].x - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
+        circle_area.y1 = points[i].y - ((style->line.width - 1) >> 1) - ((style->line.width - 1) & 0x1);
+        circle_area.x2 = points[i].x + ((style->line.width - 1) >> 1);
+        circle_area.y2 = points[i].y + ((style->line.width - 1) >> 1);
+        lv_draw_rect(&circle_area, &mask, &circle_style_tmp, LV_OPA_COVER);
+    }
+    
     lv_refr_set_disp_refreshing(refr_ori);
 }
 
diff --git a/src/lv_objx/lv_chart.c b/src/lv_objx/lv_chart.c
index 9bee1ec0f1..c326c8c6bb 100644
--- a/src/lv_objx/lv_chart.c
+++ b/src/lv_objx/lv_chart.c
@@ -1270,7 +1270,7 @@ static void lv_chart_draw_y_ticks(lv_obj_t * chart, const lv_area_t * mask, uint
         const lv_style_t * style = lv_obj_get_style(chart);
         lv_opa_t opa_scale       = lv_obj_get_opa_scale(chart);
 
-        uint8_t i, j;
+        uint8_t i;
         uint8_t num_of_labels;
         uint8_t num_scale_ticks;
         int8_t major_tick_len, minor_tick_len;
@@ -1396,8 +1396,7 @@ static void lv_chart_draw_x_ticks(lv_obj_t * chart, const lv_area_t * mask)
         const lv_style_t * style = lv_obj_get_style(chart);
         lv_opa_t opa_scale       = lv_obj_get_opa_scale(chart);
 
-        uint8_t i, j;
-        uint8_t list_index;
+        uint8_t i;
         uint8_t num_of_labels;
         uint8_t num_scale_ticks;
         uint8_t major_tick_len, minor_tick_len;
diff --git a/src/lv_objx/lv_chart.h b/src/lv_objx/lv_chart.h
index dd2c9be8b9..55fb929990 100644
--- a/src/lv_objx/lv_chart.h
+++ b/src/lv_objx/lv_chart.h
@@ -34,6 +34,9 @@ extern "C" {
 /**Automatically calculate the tick length*/
 #define LV_CHART_TICK_LENGTH_AUTO 255
 
+LV_EXPORT_CONST_INT(LV_CHART_POINT_DEF);
+LV_EXPORT_CONST_INT(LV_CHART_TICK_LENGTH_AUTO);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_objx/lv_gauge.c b/src/lv_objx/lv_gauge.c
index 3ebb1cb7c3..aedb63c2a1 100644
--- a/src/lv_objx/lv_gauge.c
+++ b/src/lv_objx/lv_gauge.c
@@ -135,7 +135,6 @@ lv_obj_t * lv_gauge_create(lv_obj_t * par, const lv_obj_t * copy)
 void lv_gauge_set_needle_count(lv_obj_t * gauge, uint8_t needle_cnt, const lv_color_t colors[])
 {
     LV_ASSERT_OBJ(gauge, LV_OBJX_NAME);
-    LV_ASSERT_NULL(colors);
 
     lv_gauge_ext_t * ext = lv_obj_get_ext_attr(gauge);
 
diff --git a/src/lv_objx/lv_label.h b/src/lv_objx/lv_label.h
index 2804ef700e..2de59cdf0b 100644
--- a/src/lv_objx/lv_label.h
+++ b/src/lv_objx/lv_label.h
@@ -35,6 +35,10 @@ extern "C" {
 #define LV_LABEL_POS_LAST 0xFFFF
 #define LV_LABEL_TEXT_SEL_OFF 0xFFFF
 
+LV_EXPORT_CONST_INT(LV_LABEL_DOT_NUM);
+LV_EXPORT_CONST_INT(LV_LABEL_POS_LAST);
+LV_EXPORT_CONST_INT(LV_LABEL_TEXT_SEL_OFF);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_objx/lv_line.c b/src/lv_objx/lv_line.c
index a9dbd7e2d4..ec9e35da43 100644
--- a/src/lv_objx/lv_line.c
+++ b/src/lv_objx/lv_line.c
@@ -237,11 +237,13 @@ static bool lv_line_design(lv_obj_t * line, const lv_area_t * mask, lv_design_mo
         uint16_t i;
 
         lv_style_t circle_style_tmp; /*If rounded...*/
-        lv_style_copy(&circle_style_tmp, style);
-        circle_style_tmp.body.radius     = LV_RADIUS_CIRCLE;
-        circle_style_tmp.body.main_color = style->line.color;
-        circle_style_tmp.body.grad_color = style->line.color;
-        circle_style_tmp.body.opa        = style->line.opa;
+        if(style->line.rounded) {
+            lv_style_copy(&circle_style_tmp, style);
+            circle_style_tmp.body.radius     = LV_RADIUS_CIRCLE;
+            circle_style_tmp.body.main_color = style->line.color;
+            circle_style_tmp.body.grad_color = style->line.color;
+            circle_style_tmp.body.opa        = style->line.opa;
+        }
         lv_area_t circle_area;
 
         /*Read all points and draw the lines*/
diff --git a/src/lv_objx/lv_spinbox.c b/src/lv_objx/lv_spinbox.c
index b5b2f33af3..bd46b99525 100644
--- a/src/lv_objx/lv_spinbox.c
+++ b/src/lv_objx/lv_spinbox.c
@@ -406,9 +406,11 @@ static void lv_spinbox_updatevalue(lv_obj_t * spinbox)
     memset(buf, 0, sizeof(buf));
     char * buf_p = buf;
 
-    /*Add the sign*/
-    (*buf_p) = ext->value >= 0 ? '+' : '-';
-    buf_p++;
+    if (ext->range_min < 0) { // hide sign if there are only positive values
+        /*Add the sign*/
+        (*buf_p) = ext->value >= 0 ? '+' : '-';
+        buf_p++;
+    }
 
     int i;
     /*padding left*/
diff --git a/src/lv_objx/lv_ta.h b/src/lv_objx/lv_ta.h
index 4d3a4a4e3e..ec2854e49b 100644
--- a/src/lv_objx/lv_ta.h
+++ b/src/lv_objx/lv_ta.h
@@ -39,6 +39,8 @@ extern "C" {
  *********************/
 #define LV_TA_CURSOR_LAST (0x7FFF) /*Put the cursor after the last character*/
 
+LV_EXPORT_CONST_INT(LV_TA_CURSOR_LAST);
+
 /**********************
  *      TYPEDEFS
  **********************/
diff --git a/src/lv_objx/lv_tabview.c b/src/lv_objx/lv_tabview.c
index da48aad114..158ff53939 100644
--- a/src/lv_objx/lv_tabview.c
+++ b/src/lv_objx/lv_tabview.c
@@ -746,21 +746,19 @@ static lv_res_t lv_tabview_signal(lv_obj_t * tabview, lv_signal_t sign, void * p
         }
 
         if(sign == LV_SIGNAL_FOCUS) {
+
+
             lv_indev_type_t indev_type = lv_indev_get_type(lv_indev_get_act());
             /*With ENCODER select the first button only in edit mode*/
             if(indev_type == LV_INDEV_TYPE_ENCODER) {
 #if LV_USE_GROUP
                 lv_group_t * g = lv_obj_get_group(tabview);
                 if(lv_group_get_editing(g)) {
-                    lv_btnm_ext_t * btnm_ext = lv_obj_get_ext_attr(ext->btns);
-                    btnm_ext->btn_id_pr      = 0;
-                    lv_obj_invalidate(ext->btns);
+                    lv_btnm_set_pressed(ext->btns, ext->tab_cur);
                 }
 #endif
             } else {
-                lv_btnm_ext_t * btnm_ext = lv_obj_get_ext_attr(ext->btns);
-                btnm_ext->btn_id_pr      = 0;
-                lv_obj_invalidate(ext->btns);
+                lv_btnm_set_pressed(ext->btns, ext->tab_cur);
             }
         }
     } else if(sign == LV_SIGNAL_GET_EDITABLE) {
diff --git a/src/lv_objx/lv_win.c b/src/lv_objx/lv_win.c
index 58bdcd8b64..03c689a0f8 100644
--- a/src/lv_objx/lv_win.c
+++ b/src/lv_objx/lv_win.c
@@ -254,6 +254,8 @@ void lv_win_set_content_size(lv_obj_t * win, lv_coord_t w, lv_coord_t h)
 
     lv_win_ext_t * ext = lv_obj_get_ext_attr(win);
     h += lv_obj_get_height(ext->header);
+
+    lv_obj_set_size(win, w, h);
 }
 
 /**