Merge pull request #8079 from s-hadinger/fade_startup

Add command ``SetOption91 1`` to enable fading at startup / power on

tasmota/CHANGELOG.md

@@ -11,6 +11,7 @@
 - Add command ``SetOption90 1`` to disable non-json MQTT messages (#8044)
 - Add command ``Sensor10 0/1/2`` to control BH1750 resolution - 0 = High (default), 1 = High2, 2 = Low (#8016)
 - Add command ``Sensor10 31..254`` to control BH1750 measurement time which defaults to 69 (#8016)
+- Add command ``SetOption91 1`` to enable fading at startup / power on
 
 ### 8.2.0.2 20200328
 

tasmota/settings.h

@@ -110,7 +110,7 @@ typedef union {                            // Restricted by MISRA-C Rule 18.4 bu
     uint32_t remote_device_mode : 1;       // bit 6 (v8.1.0.9)   - SetOption88 - PWM Dimmer Buttons control remote devices
     uint32_t zigbee_distinct_topics : 1;   // bit 7 (v8.1.0.10)  - SetOption89 - Distinct MQTT topics per device for Zigbee (#7835)
     uint32_t only_json_message : 1;        // bit 8 (v8.2.0.3)   - SetOption90 - Disable non-json MQTT response
-    uint32_t spare09 : 1;
+    uint32_t fade_at_startup : 1;          // bit 9 (v8.2.0.3)   - SetOption91 - Enable light fading at start/power on
     uint32_t spare10 : 1;
     uint32_t spare11 : 1;
     uint32_t spare12 : 1;

tasmota/xdrv_04_light.ino

@@ -1310,6 +1310,9 @@ void LightInit(void)
   Light.power = 0;
   Light.update = true;
   Light.wakeup_active = 0;
+  if (Settings.flag4.fade_at_startup) {
+    Light.fade_initialized = true;      // consider fade intialized starting from black
+  }
 
   LightUpdateColorMapping();
 }