Enhanced usermods. (#2522)

usermods/RTC/usermod_rtc.h

@@ -3,6 +3,14 @@
 #include "src/dependencies/time/DS1307RTC.h"
 #include "wled.h"
 
+#ifdef ARDUINO_ARCH_ESP32
+  #define HW_PIN_SCL 22
+  #define HW_PIN_SDA 21
+#else
+  #define HW_PIN_SCL 5
+  #define HW_PIN_SDA 4
+#endif
+
 //Connect DS1307 to standard I2C pins (ESP32: GPIO 21 (SDA)/GPIO 22 (SCL))
 
 class RTCUsermod : public Usermod {
@@ -12,6 +20,8 @@ class RTCUsermod : public Usermod {
   public:
 
     void setup() {
+      PinManagerPinType pins[2] = { { HW_PIN_SCL, true }, { HW_PIN_SDA, true } };
+      if (!pinManager.allocateMultiplePins(pins, 2, PinOwner::HW_I2C)) { disabled = true; return; }
       time_t rtcTime = RTC.get();
       if (rtcTime) {
         toki.setTime(rtcTime,TOKI_NO_MS_ACCURACY,TOKI_TS_RTC);
@@ -22,12 +32,26 @@ class RTCUsermod : public Usermod {
     }
 
     void loop() {
+      if (strip.isUpdating()) return;
       if (!disabled && toki.isTick()) {
         time_t t = toki.second();
         if (t != RTC.get()) RTC.set(t); //set RTC to NTP/UI-provided value
       }
     }
 
+    /*
+     * addToConfig() can be used to add custom persistent settings to the cfg.json file in the "um" (usermod) object.
+     * It will be called by WLED when settings are actually saved (for example, LED settings are saved)
+     * I highly recommend checking out the basics of ArduinoJson serialization and deserialization in order to use custom settings!
+     */
+    void addToConfig(JsonObject& root)
+    {
+      JsonObject top = root.createNestedObject("RTC");
+      JsonArray pins = top.createNestedArray("pin");
+      pins.add(HW_PIN_SCL);
+      pins.add(HW_PIN_SDA);
+    }
+
     uint16_t getId()
     {
       return USERMOD_ID_RTC;