add new object type: lv_ canvas

lv_conf_templ.h

@@ -277,7 +277,7 @@
 /*Line meter (dependencies: *;)*/
 #define USE_LV_LMETER   1
 
-/*Gauge (dependencies:bar, lmeter)*/
+/*Gauge (dependencies:lv_bar, lv_lmeter)*/
 #define USE_LV_GAUGE    1
 
 /*Chart (dependencies: -)*/
@@ -308,7 +308,7 @@
 /*Calendar (dependencies: -)*/
 #define USE_LV_CALENDAR 1
 
-/*Preload (dependencies: arc)*/
+/*Preload (dependencies: lv_arc)*/
 #define USE_LV_PRELOAD      1
 #if USE_LV_PRELOAD != 0
 #define LV_PRELOAD_DEF_ARC_LENGTH   60      /*[deg]*/
@@ -316,6 +316,8 @@
 #define LV_PRELOAD_DEF_ANIM         LV_PRELOAD_TYPE_SPINNING_ARC
 #endif
 
+/*Canvas (dependencies: lv_img)*/
+#define USE_LV_CANVAS       1
 /*************************
  * User input objects
  *************************/

lv_misc/lv_task.h

@@ -73,9 +73,8 @@ void lv_task_init(void);
 
 /**
  * Call it  periodically to handle lv_tasks.
- * @return true: no error; false: error ocurred
  */
-LV_ATTRIBUTE_TASK_HANDLER bool lv_task_handler(void);
+LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void);
 
 /**
  * Create a new lv_task

lvgl.h

@@ -47,6 +47,7 @@ extern "C" {
 #include "lv_objx/lv_ddlist.h"
 #include "lv_objx/lv_roller.h"
 #include "lv_objx/lv_ta.h"
+#include "lv_objx/lv_canvas.h"
 #include "lv_objx/lv_win.h"
 #include "lv_objx/lv_tabview.h"
 #include "lv_objx/lv_tileview.h"