fix callback conventions

src/lv_core/lv_obj.h

@@ -536,13 +536,15 @@ lv_res_t lv_event_send(lv_obj_t * obj, lv_event_t event, const void * data);
 
 /**
  * Call an event function with an object, event, and data.
- * @param event_cb an event callback function
+ * @param event_xcb an event callback function. If `NULL` `LV_RES_OK` will return without any actions.
+ *        (the 'x' in the argument name indicates that its not a fully generic function because it not follows
+ *         the `func_name(object, callback, ...)` convention)
  * @param obj pointer to an object to associate with the event (can be `NULL` to simply call the `event_cb`)
  * @param event an event
  * @param data pointer to a custom data
  * @return LV_RES_OK: `obj` was not deleted in the event; LV_RES_INV: `obj` was deleted in the event
  */
-lv_res_t lv_event_send_func(lv_event_cb_t event_cb, lv_obj_t * obj, lv_event_t event, const void * data);
+lv_res_t lv_event_send_func(lv_event_cb_t event_xcb, lv_obj_t * obj, lv_event_t event, const void * data);
 
 /**
  * Get the `data` parameter of the current event

src/lv_misc/lv_task.c

@@ -212,7 +212,9 @@ lv_task_t * lv_task_create_basic(void)
 
 /**
  * Create a new lv_task
- * @param task a function which is the task itself
+ * @param task_xcb a callback which is the task itself. It will be called periodically.
+ *                 (the 'x' in the argument name indicates that its not a fully generic function because it not follows
+ *                  the `func_name(object, callback, ...)` convention)
  * @param period call period in ms unit
  * @param prio priority of the task (LV_TASK_PRIO_OFF means the task is stopped)
  * @param user_data custom parameter

src/lv_misc/lv_task.h

@@ -92,15 +92,18 @@ LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void);
  */
 lv_task_t * lv_task_create_basic(void);
 
+
 /**
  * Create a new lv_task
- * @param task a function which is the task itself
+ * @param task_xcb a callback which is the task itself. It will be called periodically.
+ *                 (the 'x' in the argument name indicates that its not a fully generic function because it not follows
+ *                  the `func_name(object, callback, ...)` convention)
  * @param period call period in ms unit
  * @param prio priority of the task (LV_TASK_PRIO_OFF means the task is stopped)
  * @param user_data custom parameter
  * @return pointer to the new task
  */
-lv_task_t * lv_task_create(lv_task_cb_t task_cb, uint32_t period, lv_task_prio_t prio, void * user_data);
+lv_task_t * lv_task_create(lv_task_cb_t task_xcb, uint32_t period, lv_task_prio_t prio, void * user_data);
 
 /**
  * Delete a lv_task