Add generic SystemWaitIfBusy() to fix WS2812 led flicker

Add generic SystemWaitIfBusy() to fix WS2812 led flicker

tasmota/tasmota.ino

@@ -310,6 +310,7 @@ struct TasmotaGlobal_t {
   bool no_autoexec;                         // Disable autoexec
 
   uint8_t user_globals[3];                  // User set global temp/hum/press
+  uint8_t busy_time;                        // Time in ms to allow executing of time critical functions
   uint8_t init_state;                       // Tasmota init state
   uint8_t heartbeat_inverted;               // Heartbeat pulse inverted flag
   uint8_t spi_enabled;                      // SPI configured

tasmota/tasmota_support/support.ino

@@ -2210,6 +2210,31 @@ bool TimeReachedUsec(uint32_t timer)
   return (passed >= 0);
 }
 
+void SystemSetBusy(uint32_t busy) {
+/*
+  TasmotaGlobal.busy_time = millis();
+  SetNextTimeInterval(TasmotaGlobal.busy_time, busy +1);
+  if (!TasmotaGlobal.busy_time) {
+    TasmotaGlobal.busy_time++;
+  }
+*/
+  TasmotaGlobal.busy_time = busy;
+}
+
+void SystemWaitIfBusy(void) {
+  if (TasmotaGlobal.busy_time) {
+/*
+    // Calls to millis() interrupt RMT and defeats our goal
+    if (!TimeReached(TasmotaGlobal.busy_time)) {
+      delay(1);
+    }
+*/
+    delay(TasmotaGlobal.busy_time);
+
+    TasmotaGlobal.busy_time = 0;
+  }
+}
+
 /*********************************************************************************************\
  * Syslog
  *

tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_leds.ino

@@ -136,6 +136,7 @@ extern "C" {
           case 2: // # 02 : show         void -> void
             if (s_ws2812_grb)       s_ws2812_grb->Show();
             if (s_sk6812_grbw)      s_sk6812_grbw->Show();
+            SystemSetBusy(4);
             break;
           case 3: // # 03 : CanShow      void -> bool
             if (s_ws2812_grb)       be_pushbool(vm, s_ws2812_grb->CanShow());

tasmota/tasmota_xlgt_light/xlgt_01_ws2812.ino

@@ -212,6 +212,11 @@ long wsmap(long x, long in_min, long in_max, long out_min, long out_max) {
   return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
 }
 
+void Ws2812LibStripShow(void) {
+  strip->Show();
+  SystemSetBusy(Settings->light_pixels >> 2);  // 256 / 64 = 4
+}
+
 void Ws2812StripShow(void)
 {
 #if (USE_WS2812_CTYPE > NEO_3LED)
@@ -232,7 +237,7 @@ void Ws2812StripShow(void)
       strip->SetPixelColor(i, c);
     }
   }
-  strip->Show();
+  Ws2812LibStripShow();
 }
 
 int mod(int a, int b)
@@ -549,7 +554,7 @@ void Ws2812DDP(void)
 void Ws2812Clear(void)
 {
   strip->ClearTo(0);
-  strip->Show();
+  Ws2812LibStripShow();
   Ws2812.show_next = 1;
 }
 
@@ -575,7 +580,7 @@ void Ws2812SetColor(uint32_t led, uint8_t red, uint8_t green, uint8_t blue, uint
   }
 
   if (!Ws2812.suspend_update) {
-    strip->Show();
+    Ws2812LibStripShow();
     Ws2812.show_next = 1;
   }
 }
@@ -616,7 +621,7 @@ void Ws2812ForceSuspend (void)
 void Ws2812ForceUpdate (void)
 {
   Ws2812.suspend_update = false;
-  strip->Show();
+  Ws2812LibStripShow();
   Ws2812.show_next = 1;
 }
 
@@ -797,7 +802,7 @@ size_t Ws2812StripGetPixelSize(void) {
 // return true if strip was dirty and an actual refresh was triggered
 bool Ws2812StripRefresh(void) {
   if (strip->IsDirty()) {
-    strip->Show();
+    Ws2812LibStripShow();
     return true;
   } else {
     return false;

tasmota/tasmota_xsns_sensor/xsns_02_analog.ino

@@ -317,11 +317,8 @@ uint16_t AdcRead(uint32_t pin, uint32_t factor) {
   // factor 3 = 8 samples
   // factor 4 = 16 samples
   // factor 5 = 32 samples
-#ifdef USE_LIGHT
+  SystemWaitIfBusy();
-  if ((XLGT_01 == TasmotaGlobal.light_driver) && LightPower()) {
+
-    delay(5);  // analogRead() interferes with DMA/RMT so wait for a decent amount of time
-  }
-#endif  // USE_LIGHT
   uint32_t samples = 1 << factor;
   uint32_t analog = 0;
   for (uint32_t i = 0; i < samples; i++) {