display date

include/devices.h

@@ -65,6 +65,15 @@ namespace Devices {
                 }
             }).build()
         )
+        .addSecondary(
+            Builder<Button>::instance(new Button{"Display date", "display_date",
+                [](const char* msg) {
+                    if (strcmp("PRESS", msg) == 0 && !Display::tDisplayDate.isEnabled()) {
+                        Display::tDisplayDate.restart();
+                    };
+                }
+            }).build()
+        )
         .addSecondary(
             Builder<Button>::instance(new Button{"Update time", "update_time",
                 [](const char* msg) {

include/display.h

@@ -15,10 +15,12 @@
 #define BRIGHTNESS_DAY 11
 #define SECONDS(value) value*1000
 #define DISPLAY_SENSOR_ITERATIONS 2
+#define DISPLAY_DELAY (SECONDS(2))
 
 namespace Display {
 
     void displayTime();
+    void displayDate();
     void displayTemp();
     void displayHumidity();
     void drawTime();
@@ -40,6 +42,15 @@ namespace Display {
             tDisplaySensor.setIterations(DISPLAY_SENSOR_ITERATIONS * 2);
             tDisplayTime.enableDelayed(tDisplaySensor.getInterval());
         });
+    Task tDisplayDate(TASK_IMMEDIATE, TASK_ONCE, displayDate, &ts, false,
+        []() {
+            tDisplayTime.disable();
+            tDisplaySensor.disable();
+            return true;
+        },
+        []() {
+            tDisplayTime.enableDelayed(5 * TASK_SECOND);
+        });
 
     bool hourFormat24 = false;
     void (*hourFormatChangedCallback)();
@@ -133,14 +144,30 @@ namespace Display {
         tDisplayTime.disable();
         clockDisplay.print(value, HEX);
         clockDisplay.writeDisplay();
-        tDisplayTime.enableDelayed(SECONDS(2));
+        tDisplayTime.enableDelayed(DISPLAY_DELAY);
     }
 
     void displayText(const char c[]) {
         tDisplayTime.disable();
         clockDisplay.println(c);
         clockDisplay.writeDisplay();
-        tDisplayTime.enableDelayed(SECONDS(2));
+        tDisplayTime.enableDelayed(DISPLAY_DELAY);
+    }
+
+    unordered_map<char, const char*> daysOfWeek = {
+        {1, "So"},
+        {2, "Mo"},
+        {3, "Di"},
+        {4, "Mi"},
+        {5, "Do"},
+        {6, "Fr"},
+        {7, "Sa"},
+    };
+    void displayDate() {
+        char date[5];
+        sprintf(date, "%2s%2u", daysOfWeek[weekday()], day());
+        clockDisplay.println(date);
+        clockDisplay.writeDisplay();
     }
 
     void changeHourFormat24(bool format24) {