modules: lvgl: expose the lvgl workqueue to the user application

allowing to schedule a delayed LVGL work for an amount of
miliseconds

Signed-off-by: Felipe Neves <[email protected]>

Author: uLipe

modules/lvgl/include/lvgl_zephyr.h

@@ -32,6 +32,20 @@ extern "C" {
  */
 int lvgl_init(void);
 
+#ifdef CONFIG_LV_Z_RUN_LVGL_ON_WORKQUEUE
+/**
+ * @brief Schedule an LVGL delayed by amount of miliseconds
+ *
+ * This function submit a delayed job to the LVGL internal's
+ * workqueue, the job will be delayed by an amount of miliseconds
+ * selected by the user
+ *
+ * @return 0 on success, negative errno code on failure
+ */
+int lvgl_schedule_job(int32_t ms);
+
+#endif /* CONFIG_LV_Z_RUN_LVGL_ON_WORKQUEUE */
+
 #ifdef __cplusplus
 }
 #endif

modules/lvgl/lvgl.c

@@ -221,7 +221,7 @@ static int lvgl_allocate_rendering_buffers(lv_display_t *display)
 
 #ifdef CONFIG_LV_Z_RUN_LVGL_ON_WORKQUEUE
 
-K_THREAD_STACK_DEFINE(lvgl_workqueue_stack, CONFIG_LV_Z_LVGL_WORKQUEUE_STACK_SIZE);
+static K_THREAD_STACK_DEFINE(lvgl_workqueue_stack, CONFIG_LV_Z_LVGL_WORKQUEUE_STACK_SIZE);
 static struct k_work_q lvgl_workqueue;
 
 static void lvgl_timer_handler_work(struct k_work *work)
@@ -236,7 +236,7 @@ static void lvgl_timer_handler_work(struct k_work *work)
 
 	k_work_schedule_for_queue(&lvgl_workqueue, dwork, K_MSEC(wait_time));
 }
-K_WORK_DEFINE(lvgl_work, lvgl_timer_handler_work);
+static K_WORK_DEFINE(lvgl_work, lvgl_timer_handler_work);
 
 #endif /* CONFIG_LV_Z_RUN_LVGL_ON_WORKQUEUE */
 
@@ -359,6 +359,16 @@ int lvgl_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_LV_Z_RUN_LVGL_ON_WORKQUEUE
+int lvgl_schedule_job(int32_t ms)
+{
+	struct k_work_delayable *dwork = k_work_delayable_from_work(&lvgl_work);
+
+	return k_work_schedule_for_queue(&lvgl_workqueue, dwork, K_MSEC(ms));
+}
+
+#endif
+
 #ifdef CONFIG_LV_Z_AUTO_INIT
 SYS_INIT(lvgl_init, APPLICATION, CONFIG_LV_Z_INIT_PRIORITY);
 #endif /* CONFIG_LV_Z_AUTO_INIT */