fastpath: use i2s#1 for 5th LED pin

use 4 RMT channels, then I2S#1, then RMT 5-8. This allows to have up to 5 "fast" LED pins.

"Even though the ESP32 has 8 channels of RMT hardware, using beyond 4 has shown to cause sending delays." (https://github.com/Makuna/NeoPixelBus/wiki/ESP32-NeoMethods#rmt)

wled00/bus_manager.cpp

@@ -9,6 +9,8 @@
 #include "bus_wrapper.h"
 #include "bus_manager.h"
 
+//WLEDMM: #define DEBUGOUT(x) netDebugEnabled?NetDebug.print(x):Serial.print(x) not supported in this file as netDebugEnabled not in scope
+#if 0
 //colors.cpp
 uint32_t colorBalanceFromKelvin(uint16_t kelvin, uint32_t rgb);
 uint16_t approximateKelvinFromRGB(uint32_t rgb);
@@ -18,7 +20,6 @@ void colorRGBtoRGBW(byte* rgb);
 uint8_t realtimeBroadcast(uint8_t type, IPAddress client, uint16_t length, byte *buffer, uint8_t bri=255, bool isRGBW=false);
 
 // enable additional debug output
-//WLEDMM: #define DEBUGOUT(x) netDebugEnabled?NetDebug.print(x):Serial.print(x) not supported in this file as netDebugEnabled not in scope
 #if defined(WLED_DEBUG_HOST)
   #include "net_debug.h"
   #define DEBUGOUT NetDebug
@@ -38,6 +39,10 @@ uint8_t realtimeBroadcast(uint8_t type, IPAddress client, uint16_t length, byte
   #define DEBUG_PRINTLN(x)
   #define DEBUG_PRINTF(x...)
 #endif
+#else
+ // WLEDMM use wled.h
+#include "wled.h"
+#endif
 
 //color mangling macros
 #define RGBW32(r,g,b,w) (uint32_t((byte(w) << 24) | (byte(r) << 16) | (byte(g) << 8) | (byte(b))))
@@ -114,7 +119,11 @@ BusDigital::BusDigital(BusConfig &bc, uint8_t nr, const ColorOrderMap &com) : Bu
   _busPtr = PolyBus::create(_iType, _pins, lenToCreate, nr);
   _valid = (_busPtr != nullptr);
   _colorOrder = bc.colorOrder;
-  DEBUG_PRINTF("%successfully inited strip %u (len %u) with type %u and pins %u,%u (itype %u)\n", _valid?"S":"Uns", nr, _len, bc.type, _pins[0],_pins[1],_iType);
+  if (_pins[1] != 255) {  // WLEDMM USER_PRINTF
+    USER_PRINTF("%successfully inited strip %u (len %u) with type %u and pins %u,%u (itype %u)\n", _valid?"S":"Uns", nr, _len, bc.type, _pins[0],_pins[1],_iType);
+  } else {
+    USER_PRINTF("%successfully inited strip %u (len %u) with type %u and pin %u (itype %u)\n", _valid?"S":"Uns", nr, _len, bc.type, _pins[0],_iType);
+  }
 }
 
 void BusDigital::show() {

wled00/bus_wrapper.h

@@ -928,9 +928,15 @@ class PolyBus {
       if (num > 3) return I_NONE;
       //if (num > 3) offset = num -4; // I2S not supported yet
       #else
+      #ifndef WLEDMM_FASTPATH
       // standard ESP32 has 8 RMT and 2 I2S channels
       if (num > 9) return I_NONE;
       if (num > 7) offset = num -7;
+      #else
+      // ESP32 "audio_fastpath" - 8 RMT and 1 I2S channels. RMT 5-8 have sending delays, so use I2S#1 as 5th bus, before going for RMT 5-8
+      if (num > 8) return I_NONE;
+      if (num == 4) offset = 2;  // use I2S channel 2 as 5th bus. Ladies and Gentlemen, _this_ is a dirty hack.
+      #endif
       #endif
       switch (busType) {
         case TYPE_WS2812_1CH_X3:

wled00/const.h

@@ -43,8 +43,13 @@
       #define WLED_MIN_VIRTUAL_BUSSES 4
     #else
       #if defined(USERMOD_AUDIOREACTIVE)      // requested by @softhack007 https://github.com/blazoncek/WLED/issues/33
+      #ifndef WLEDMM_FASTPATH
         #define WLED_MAX_BUSSES 8
         #define WLED_MIN_VIRTUAL_BUSSES 2
+      #else
+        #define WLED_MAX_BUSSES 9           // WLEDMM I2S#1 is availeable for LEDs
+        #define WLED_MIN_VIRTUAL_BUSSES 1
+      #endif
       #else
         #define WLED_MAX_BUSSES 10
         #define WLED_MIN_VIRTUAL_BUSSES 0