move ws LEDs preview buffer into PSRAM

* set DYNAMICBUFFER_USE_PSRAM in build_flags => enable PSRAM support in AsyncWebServerWLED

wled00/ws.cpp

@@ -5,6 +5,10 @@
  */
 #ifdef WLED_ENABLE_WEBSOCKETS
 
+#ifdef DYNAMICBUFFER_USE_PSRAM
+#warning "DYNAMICBUFFER_USE_PSRAM is experimental"
+#endif
+
 static volatile uint16_t wsLiveClientId = 0;        // WLEDMM added "static"
 static volatile unsigned long wsLastLiveTime = 0;   // WLEDMM
 //uint8_t* wsFrameBuffer = nullptr;
@@ -222,7 +226,11 @@ static bool sendLiveLedsWs(uint32_t wsClient)  // WLEDMM added "static"
   #ifdef ESP8266
     constexpr size_t MAX_LIVE_LEDS_WS = 256U;
   #else
+  #if !defined(BOARD_HAS_PSRAM) || !defined(DYNAMICBUFFER_USE_PSRAM)
     constexpr size_t MAX_LIVE_LEDS_WS = 4096U;  //WLEDMM use 4096 as max matrix size
+  #else
+    constexpr size_t MAX_LIVE_LEDS_WS = 4096 * 2;  //WLEDMM better preview on PSRAM boards
+  #endif
   #endif
   size_t used;// = strip.getLengthTotal();
   size_t n;// = ((used -1)/MAX_LIVE_LEDS_WS) +1; //only serve every n'th LED if count over MAX_LIVE_LEDS_WS