1 /*
2 * Copyright (c) 2024 Martin Stumpf <finomnis@gmail.com>
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/device.h>
8 #include <zephyr/devicetree.h>
9 #include <zephyr/drivers/display.h>
10
11 #include <lvgl.h>
12 #include <stdio.h>
13 #include <string.h>
14 #include <zephyr/kernel.h>
15
16 #include <zephyr/logging/log.h>
17 LOG_MODULE_REGISTER(app, CONFIG_LOG_DEFAULT_LEVEL);
18
initialize_gui(void)19 static void initialize_gui(void)
20 {
21 lv_obj_t *label;
22
23 /* Configure screen and background for transparency */
24 lv_obj_set_style_bg_opa(lv_screen_active(), LV_OPA_TRANSP, LV_PART_MAIN);
25 lv_obj_set_style_bg_opa(lv_layer_bottom(), LV_OPA_TRANSP, LV_PART_MAIN);
26
27 /* Create a label, set its text and align it to the center */
28 label = lv_label_create(lv_screen_active());
29 lv_label_set_text(label, "Hello, world!");
30 lv_obj_set_style_text_color(lv_screen_active(), lv_color_hex(0xff00ff), LV_PART_MAIN);
31 lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
32 }
33
main(void)34 int main(void)
35 {
36 int err;
37 const struct device *display_dev;
38 struct display_capabilities display_caps;
39
40 display_dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_display));
41 if (!device_is_ready(display_dev)) {
42 LOG_ERR("Device not ready, aborting test");
43 return -ENODEV;
44 }
45
46 display_get_capabilities(display_dev, &display_caps);
47 if (!(display_caps.supported_pixel_formats | PIXEL_FORMAT_ARGB_8888)) {
48 LOG_ERR("Display does not support ARGB8888 mode");
49 return -ENOTSUP;
50 }
51
52 if (PIXEL_FORMAT_ARGB_8888 != display_caps.current_pixel_format) {
53 err = display_set_pixel_format(display_dev, PIXEL_FORMAT_ARGB_8888);
54 if (err != 0) {
55 LOG_ERR("Failed to set ARGB8888 pixel format");
56 return err;
57 }
58 }
59
60 initialize_gui();
61
62 lv_timer_handler();
63 display_blanking_off(display_dev);
64
65 while (1) {
66 uint32_t sleep_ms = lv_timer_handler();
67
68 k_msleep(MIN(sleep_ms, INT32_MAX));
69 }
70
71 return 0;
72 }
73
