fix(ui): partial-refresh time-set digit blink instead of full screen

UI_ShowSetTimePage() cleared and redrew the entire screen on every
500ms blink toggle and on every up/down value change, causing a
full-screen flash instead of just the intended hour/minute digit
blinking. Split out UI_UpdateSetTimeDigit() which only repaints the
32x32px digit region for the field being edited; the full page draw
is now only used on entry. Field-switch (long-press CONFIRM) refreshes
both digit regions to clear any stale blanked-out state.

App/app_set_clock.c

@@ -63,8 +63,8 @@ static void SetClockApp_onRun(void)
     if (blink != time_edit_blink_on)
     {
         time_edit_blink_on = blink;
-        // 每次闪烁状态发生变化，重新刷写屏幕数值
+        // 每次闪烁状态发生变化，只局部刷新正在调节的那个数字，不整屏重绘
-        UI_ShowSetTimePage(current_hour, current_min, time_edit_field, time_edit_blink_on);
+        UI_UpdateSetTimeDigit(current_hour, current_min, time_edit_field, time_edit_blink_on);
     }
 }
 
@@ -90,7 +90,8 @@ static EventResult SetClockApp_onEvent(SystemEvent *evt)
         } else {
             current_min = (current_min + 1) % 60;
         }
-        UI_ShowSetTimePage(current_hour, current_min, time_edit_field, 1);
+        time_edit_blink_on = 1; // 调值后强制显示 (不处于消隐周期)
+        UI_UpdateSetTimeDigit(current_hour, current_min, time_edit_field, 1);
         return EVENT_HANDLED;
     }
     if (evt->key_event == KEY_EVENT_DOWN_CLICK)
@@ -101,7 +102,8 @@ static EventResult SetClockApp_onEvent(SystemEvent *evt)
         } else {
             current_min = (current_min == 0) ? 59 : (current_min - 1);
         }
-        UI_ShowSetTimePage(current_hour, current_min, time_edit_field, 1);
+        time_edit_blink_on = 1; // 调值后强制显示 (不处于消隐周期)
+        UI_UpdateSetTimeDigit(current_hour, current_min, time_edit_field, 1);
         return EVENT_HANDLED;
     }
     if (evt->key_event == KEY_EVENT_CONFIRM_LONG)
@@ -112,7 +114,10 @@ static EventResult SetClockApp_onEvent(SystemEvent *evt)
         } else {
             time_edit_field = 1;
         }
-        UI_ShowSetTimePage(current_hour, current_min, time_edit_field, 1);
+        time_edit_blink_on = 1; // 切换焦点后两个字段都应处于可见状态
+        // 两个数字区域都局部刷新一次，避免切换前正处于消隐周期的那个数字停留在涂黑状态
+        UI_UpdateSetTimeDigit(current_hour, current_min, 1, 1);
+        UI_UpdateSetTimeDigit(current_hour, current_min, 2, 1);
         return EVENT_HANDLED;
     }
     if (evt->key_event == KEY_EVENT_CONFIRM_CLICK)

App/ui.c

@@ -370,55 +370,68 @@ void UI_ShowMainMenu(u8 selected_index)
  * @param selection 当前正在编辑聚焦的属性位 (1: 修改小时, 2: 修改分钟)
  * @param blink_on 当前 500ms 控制隐现的闪烁周期标志位 (1-绘制正常字，0-以空格消隐该数值字符)
  */
+// 小时/分钟数字在屏幕上的固定坐标 (16x32 字体，两位数字宽度为 32px)
+#define SET_TIME_DIGIT_Y     100
+#define SET_TIME_DIGIT_W     32
+#define SET_TIME_DIGIT_H     32
+#define SET_TIME_HOUR_X      23
+#define SET_TIME_MIN_X       75
+
 void UI_ShowSetTimePage(u8 hour, u8 min, u8 selection, u8 blink_on)
 {
     char time_str[6];
     LCD_Clear(COLOR_BLACK);
-    
+
     // 绘制绿锁头等背景静态信息
     LCD_DrawRectBorder(10, 23, 20, 15, COLOR_GREEN);
     LCD_FillRect(15, 15, 2, 8, COLOR_GREEN);
     LCD_FillRect(17, 15, 8, 2, COLOR_GREEN);
     LCD_FillRect(25, 17, 2, 6, COLOR_GREEN);
-    
+
     // 移动电池百分比和图标到 135px 右上角
     LCD_ShowString(77, 24, "85%", COLOR_GRAY, COLOR_BLACK);
     LCD_DrawMonoBitmap(107, 27, 20, 10, bmp_battery_20x10, COLOR_GRAY, COLOR_BLACK);
 
-    // ====== 处理调节项一：小时的消隐/显示逻辑 ======
+    // 整页绘制时，小时/分钟数字一律完整显示 (消隐闪烁效果交给 UI_UpdateSetTimeDigit 局部刷新处理)
-    if (selection == 1 && !blink_on)
+    time_str[0] = '0' + (hour / 10);
-    {
+    time_str[1] = '0' + (hour % 10);
-        // 聚焦在小时且处于灭周期，用空格隐藏数值，形成数值跳变闪烁调节感
-        time_str[0] = ' ';
-        time_str[1] = ' ';
-    }
-    else
-    {
-        time_str[0] = '0' + (hour / 10);
-        time_str[1] = '0' + (hour % 10);
-    }
     time_str[2] = '\0';
-    LCD_ShowString16x32(23, 100, time_str, COLOR_CYAN, COLOR_BLACK); // 采用青色特大字描绘小时 (在 135px 下整体居中 X = 23)
+    LCD_ShowString16x32(SET_TIME_HOUR_X, SET_TIME_DIGIT_Y, time_str, COLOR_CYAN, COLOR_BLACK); // 采用青色特大字描绘小时 (在 135px 下整体居中 X = 23)
 
     // 绘制中间冒号 (在 135px 下整体居中 X = 59)
     LCD_ShowString16x32(59, 98, ":", COLOR_WHITE, COLOR_BLACK);
 
-    // ====== 处理调节项二：分钟的消隐/显示逻辑 ======
+    time_str[0] = '0' + (min / 10);
-    if (selection == 2 && !blink_on)
+    time_str[1] = '0' + (min % 10);
-    {
-        // 聚焦在分钟且处于灭周期，用空格隐藏数值
-        time_str[0] = ' ';
-        time_str[1] = ' ';
-    }
-    else
-    {
-        time_str[0] = '0' + (min / 10);
-        time_str[1] = '0' + (min % 10);
-    }
     time_str[2] = '\0';
-    LCD_ShowString16x32(75, 100, time_str, COLOR_CYAN, COLOR_BLACK); // 采用青色特大字描绘分钟 (在 135px 下整体居中 X = 75)
+    LCD_ShowString16x32(SET_TIME_MIN_X, SET_TIME_DIGIT_Y, time_str, COLOR_CYAN, COLOR_BLACK); // 采用青色特大字描绘分钟 (在 135px 下整体居中 X = 75)
-    
+
     // 补齐底部的固定辅助元素
     LCD_ShowStringCentered(150, Lang_Get(STR_CLOCK_AMPM), COLOR_WHITE, COLOR_BLACK);
     LCD_ShowStringCentered(195, Lang_Get(STR_CLOCK_DATE), COLOR_GRAY, COLOR_BLACK);
 }
+
+/**
+ * @brief 局部刷新时间设置界面里"正在调节的那一个"数字 (小时或分钟)
+ * @param selection 1:刷新小时区域, 2:刷新分钟区域
+ * @param blink_on 1:显示数值, 0:消隐(涂黑)，用于 500ms 周期闪烁效果
+ * @details 只重画 32x32px 的数字区域，不触碰锁头/电池/冒号/AM-PM/日期等其它内容，
+ *          避免每次闪烁或调值都整屏 LCD_Clear() 造成全屏闪烁。
+ */
+void UI_UpdateSetTimeDigit(u8 hour, u8 min, u8 selection, u8 blink_on)
+{
+    char time_str[3];
+    u16 x = (selection == 1) ? SET_TIME_HOUR_X : SET_TIME_MIN_X;
+    u8 value = (selection == 1) ? hour : min;
+
+    if (!blink_on) {
+        // 灭周期：直接把这一小块涂黑，形成消隐效果
+        LCD_FillRect(x, SET_TIME_DIGIT_Y, SET_TIME_DIGIT_W, SET_TIME_DIGIT_H, COLOR_BLACK);
+        return;
+    }
+
+    time_str[0] = '0' + (value / 10);
+    time_str[1] = '0' + (value % 10);
+    time_str[2] = '\0';
+    LCD_ShowString16x32(x, SET_TIME_DIGIT_Y, time_str, COLOR_CYAN, COLOR_BLACK);
+}

App/ui.h

@@ -82,4 +82,11 @@ void UI_ShowMainMenu(u8 selected_index);
  */
 void UI_ShowSetTimePage(u8 hour, u8 min, u8 selection, u8 blink_on);
 
+/**
+ * @brief 局部刷新时间设置界面里正在调节的那一个数字 (小时或分钟)，用于闪烁/调值时避免整屏重绘
+ * @param selection 1:刷新小时区域, 2:刷新分钟区域
+ * @param blink_on 1:显示数值, 0:消隐(涂黑)
+ */
+void UI_UpdateSetTimeDigit(u8 hour, u8 min, u8 selection, u8 blink_on);
+
 #endif // __UI_H__