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+/*
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+ * Copyright (c) 2006-2021, RT-Thread Development Team
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+ *
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+ * SPDX-License-Identifier: Apache-2.0
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+ *
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+ * Change Logs:
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+ * Date Author Notes
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+ * 2021-10-17 Meco Man First version
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+ */
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+
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+#include <rtthread.h>
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+#include <lvgl.h>
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+#include <drv_lcd.h>
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+#define DBG_TAG "LVGL"
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+#define DBG_LVL DBG_INFO
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+#include <rtdbg.h>
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+
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+#ifndef LV_THREAD_STACK_SIZE
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+#define LV_THREAD_STACK_SIZE 2048
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+#endif
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+
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+#ifndef LV_THREAD_PRIO
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+#define LV_THREAD_PRIO (RT_THREAD_PRIORITY_MAX*2/3)
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+#endif
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+
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+static void lv_example_get_started_1(void);
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+static void lv_example_get_started_3(void);
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+
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+#define MY_DISP_HOR_RES 240 /* 240*240 */
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+
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+/*A static or global variable to store the buffers*/
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+static lv_disp_draw_buf_t disp_buf;
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+
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+/*Static or global buffer(s). The second buffer is optional*/
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+static lv_color_t buf_1[MY_DISP_HOR_RES * 10];
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+static lv_color_t buf_2[MY_DISP_HOR_RES * 10];
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+
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+static lv_disp_drv_t disp_drv; /*Descriptor of a display driver*/
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+
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+/*Flush the content of the internal buffer the specific area on the display
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+ *You can use DMA or any hardware acceleration to do this operation in the background but
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+ *'lv_disp_flush_ready()' has to be called when finished.*/
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+static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
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+{
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+ lcd_fill_array(area->x1, area->y1, area->x2, area->y2, color_p);
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+
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+ /*IMPORTANT!!!
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+ *Inform the graphics library that you are ready with the flushing*/
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+ lv_disp_flush_ready(disp_drv);
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+}
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+
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+static void lvgl_thread(void *parameter)
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+{
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+ lv_init();
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+
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+ /*Initialize `disp_buf` with the buffer(s). With only one buffer use NULL instead buf_2 */
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+ lv_disp_draw_buf_init(&disp_buf, buf_1, buf_2, MY_DISP_HOR_RES*10);
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+
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+ lv_disp_drv_init(&disp_drv); /*Basic initialization*/
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+
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+ /*Set the resolution of the display*/
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+ disp_drv.hor_res = MY_DISP_HOR_RES;
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+ disp_drv.ver_res = MY_DISP_HOR_RES;
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+
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+ /*Set a display buffer*/
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+ disp_drv.draw_buf = &disp_buf;
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+
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+ /*Used to copy the buffer's content to the display*/
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+ disp_drv.flush_cb = disp_flush;
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+
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+ /*Finally register the driver*/
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+ lv_disp_drv_register(&disp_drv);
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+
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+ lv_example_get_started_1();
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+ lv_example_get_started_3();
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+
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+ while(1)
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+ {
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+ lv_task_handler();
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+ rt_thread_mdelay(10);
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+ }
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+}
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+
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+static int lvgl_demo_init(void)
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+{
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+ rt_thread_t tid;
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+
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+ tid = rt_thread_create("lvgl", lvgl_thread, RT_NULL, LV_THREAD_STACK_SIZE, LV_THREAD_PRIO, 0);
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+ rt_thread_startup(tid);
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+
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+ return 0;
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+}
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+INIT_COMPONENT_EXPORT(lvgl_demo_init);
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+
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+/* ------------------- demo1 ----------------------- */
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+
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+static void btn_event_cb(lv_event_t * e)
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+{
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+ lv_event_code_t code = lv_event_get_code(e);
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+ lv_obj_t * btn = lv_event_get_target(e);
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+ if(code == LV_EVENT_CLICKED) {
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+ static uint8_t cnt = 0;
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+ cnt++;
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+
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+ /*Get the first child of the button which is the label and change its text*/
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+ lv_obj_t * label = lv_obj_get_child(btn, 0);
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+ lv_label_set_text_fmt(label, "Button: %d", cnt);
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+ }
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+}
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+
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+/**
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+ * Create a button with a label and react on click event.
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+ */
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+static void lv_example_get_started_1(void)
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+{
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+ lv_obj_t * btn = lv_btn_create(lv_scr_act()); /*Add a button the current screen*/
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+ lv_obj_set_pos(btn, 10, 10); /*Set its position*/
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+ lv_obj_set_size(btn, 120, 50); /*Set its size*/
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+ lv_obj_add_event_cb(btn, btn_event_cb, LV_EVENT_ALL, NULL); /*Assign a callback to the button*/
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+
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+ lv_obj_t * label = lv_label_create(btn); /*Add a label to the button*/
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+ lv_label_set_text(label, "Button"); /*Set the labels text*/
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+ lv_obj_center(label);
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+}
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+
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+/* ------------------- demo3 ----------------------- */
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+
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+static lv_obj_t * label;
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+
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+static void slider_event_cb(lv_event_t * e)
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+{
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+ lv_obj_t * slider = lv_event_get_target(e);
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+
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+ /*Refresh the text*/
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+ lv_label_set_text_fmt(label, "%d", (int)lv_slider_get_value(slider));
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+ lv_obj_align_to(label, slider, LV_ALIGN_OUT_TOP_MID, 0, -15); /*Align top of the slider*/
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+}
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+
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+/**
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+ * Create a slider and write its value on a label.
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+ */
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+static void lv_example_get_started_3(void)
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+{
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+ /*Create a slider in the center of the display*/
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+ lv_obj_t * slider = lv_slider_create(lv_scr_act());
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+ lv_obj_set_width(slider, 200); /*Set the width*/
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+ lv_obj_center(slider); /*Align to the center of the parent (screen)*/
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+ lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_VALUE_CHANGED, NULL); /*Assign an event function*/
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+
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+ /*Create a label below the slider*/
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+ label = lv_label_create(lv_scr_act());
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+ lv_label_set_text(label, "0");
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+ lv_obj_align_to(label, slider, LV_ALIGN_OUT_TOP_MID, 0, -15); /*Align top of the slider*/
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+}
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Bernard Xiong