Merge branch 'display'

src/modules/display_module.c

@@ -0,0 +1,183 @@
+#include <zephyr/device.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/display.h>
+#include <zephyr/drivers/led.h>
+#include <zephyr/kernel.h>
+
+#include <app_event_manager.h>
+#include <lvgl.h>
+#include <lvgl_zephyr.h>
+
+#define MODULE display
+#include <caf/events/module_state_event.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
+
+#define DISPLAY_UPDATE_PERIOD_MS 1000
+#define DISPLAY_BACKLIGHT_BRIGHTNESS 100
+
+struct display_ctx {
+	const struct device *dev;
+	struct display_capabilities caps;
+	struct k_work_delayable update_work;
+	lv_obj_t *title_label;
+	lv_obj_t *count_label;
+	uint32_t tick_count;
+	bool ui_ready;
+	bool initialized;
+};
+
+static struct display_ctx disp = {
+	.dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_display)),
+};
+
+static const struct led_dt_spec display_backlight =
+	LED_DT_SPEC_GET(DT_NODELABEL(backlight));
+
+static void display_schedule_update(k_timeout_t delay)
+{
+#ifdef CONFIG_LV_Z_RUN_LVGL_ON_WORKQUEUE
+	k_work_schedule_for_queue(lvgl_get_workqueue(), &disp.update_work, delay);
+#else
+	k_work_reschedule(&disp.update_work, delay);
+#endif
+}
+
+static int display_backlight_init(void)
+{
+	int err;
+
+	if (!led_is_ready_dt(&display_backlight)) {
+		LOG_WRN("Display backlight device not ready");
+		return 0;
+	}
+
+	/*
+	 * 背光亮度交给 pwm-leds 驱动管理，这样后面如果要做调光、呼吸灯或亮度档位，
+	 * 都可以直接沿用 Zephyr 的 LED/PWM 接口，而不需要再单独碰 PWM 寄存器。
+	 */
+	err = led_set_brightness_dt(&display_backlight, DISPLAY_BACKLIGHT_BRIGHTNESS);
+	if (err) {
+		LOG_ERR("Failed to set backlight brightness: %d", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static void display_create_ui_locked(void)
+{
+	lv_obj_t *screen = lv_screen_active();
+
+	/*
+	 * 先显式设置背景和文字颜色，避免把“有画面但颜色刚好看不见”误判为
+	 * “LVGL 没有刷新”。这里使用高对比度配色，便于快速验证渲染链路。
+	 */
+	lv_obj_set_style_bg_opa(screen, LV_OPA_COVER, LV_PART_MAIN);
+	lv_obj_set_style_bg_color(screen, lv_color_hex(0x102A43), LV_PART_MAIN);
+	lv_obj_set_style_text_color(screen, lv_color_hex(0xF0F4F8), LV_PART_MAIN);
+	lv_obj_clean(screen);
+
+	disp.title_label = lv_label_create(screen);
+	lv_label_set_text(disp.title_label, "Zephyr LVGL running");
+	lv_obj_set_style_text_color(disp.title_label, lv_color_hex(0xF0F4F8), LV_PART_MAIN);
+	lv_obj_align(disp.title_label, LV_ALIGN_CENTER, 0, -16);
+
+	disp.count_label = lv_label_create(screen);
+	lv_label_set_text(disp.count_label, "tick 0");
+	lv_obj_set_style_text_color(disp.count_label, lv_color_hex(0xFFD166), LV_PART_MAIN);
+	lv_obj_align(disp.count_label, LV_ALIGN_CENTER, 0, 16);
+
+	disp.ui_ready = true;
+}
+
+static void display_update_work_fn(struct k_work *work)
+{
+	char count_str[24];
+	lv_color_t bg_color;
+
+	ARG_UNUSED(work);
+
+	if (!disp.initialized) {
+		return;
+	}
+
+	lvgl_lock();
+
+	if (!disp.ui_ready) {
+		display_create_ui_locked();
+	}
+
+	bg_color = ((disp.tick_count & 0x01u) == 0U) ? lv_color_hex(0x102A43) :
+						 lv_color_hex(0x1F6F8B);
+	lv_obj_set_style_bg_color(lv_screen_active(), bg_color, LV_PART_MAIN);
+
+	snprintk(count_str, sizeof(count_str), "tick %u", disp.tick_count++);
+	lv_label_set_text(disp.count_label, count_str);
+	lv_obj_invalidate(lv_screen_active());
+
+	lvgl_unlock();
+
+	display_schedule_update(K_MSEC(DISPLAY_UPDATE_PERIOD_MS));
+}
+
+static int display_demo_init(void)
+{
+	int err;
+
+	if (!device_is_ready(disp.dev)) {
+		LOG_ERR("Display device not ready");
+		return -ENODEV;
+	}
+
+	display_get_capabilities(disp.dev, &disp.caps);
+	LOG_INF("Display caps: %ux%u fmt=%d", disp.caps.x_resolution, disp.caps.y_resolution,
+		disp.caps.current_pixel_format);
+
+	k_work_init_delayable(&disp.update_work, display_update_work_fn);
+	disp.tick_count = 0U;
+	disp.ui_ready = false;
+
+	err = display_blanking_off(disp.dev);
+	if (err) {
+		LOG_ERR("Display blanking off failed: %d", err);
+		return err;
+	}
+
+	err = display_backlight_init();
+	if (err) {
+		return err;
+	}
+
+	disp.initialized = true;
+	display_schedule_update(K_NO_WAIT);
+	LOG_INF("LVGL display demo initialized");
+
+	return 0;
+}
+
+static bool app_event_handler(const struct app_event_header *aeh)
+{
+	if (is_module_state_event(aeh)) {
+		const struct module_state_event *event = cast_module_state_event(aeh);
+
+		if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
+			int err = display_demo_init();
+
+			if (err) {
+				module_set_state(MODULE_STATE_ERROR);
+			} else {
+				module_set_state(MODULE_STATE_READY);
+			}
+		}
+
+		return false;
+	}
+
+	__ASSERT_NO_MSG(false);
+	return false;
+}
+
+APP_EVENT_LISTENER(MODULE, app_event_handler);
+APP_EVENT_SUBSCRIBE(MODULE, module_state_event);