Improved bus handling: free choice of bus driver in any order and improved memory calculations

usermods/rgb-rotary-encoder/rgb-rotary-encoder.cpp

@@ -60,8 +60,8 @@ class RgbRotaryEncoderUsermod : public Usermod
       // …then set only the LED pin
       _pins[0] = static_cast<byte>(ledIo);
       BusConfig busCfg = BusConfig(TYPE_WS2812_RGB, _pins, 0, numLeds, COL_ORDER_GRB, false, 0);
-
-      ledBus = new BusDigital(busCfg, WLED_MAX_BUSSES - 1);
+      busCfg.iType = BusManager::getI(busCfg.type, busCfg.pins, busCfg.driverType); // assign internal bus type and output driver
+      ledBus = new BusDigital(busCfg);
       if (!ledBus->isOk()) {
         cleanup();
         return;

wled00/FX_2Dfcn.cpp

@@ -120,6 +120,9 @@ void WS2812FX::setUpMatrix() {
       for (unsigned i=0; i<customMappingSize; i++) {
         if (!(i%Segment::maxWidth)) DEBUG_PRINTLN();
         DEBUG_PRINTF_P(PSTR("%4d,"), customMappingTable[i]);
+        #if defined(CONFIG_IDF_TARGET_ESP32S2)
+        delay(1); // on S2 the CDC output can crash without a delay
+        #endif
       }
       DEBUG_PRINTLN();
       #endif

wled00/FX_fcn.cpp

@@ -100,12 +100,12 @@ Segment& Segment::operator= (const Segment &orig) {
     if (_t) stopTransition(); // also erases _t
     deallocateData();
     p_free(pixels);
+    pixels = nullptr;
     // copy source
     memcpy((void*)this, (void*)&orig, sizeof(Segment));
     // erase pointers to allocated data
     data = nullptr;
     _dataLen = 0;
-    pixels = nullptr;
     if (!stop) return *this;  // nothing to do if segment is inactive/invalid
     // copy source data
     if (orig.pixels) {
@@ -1159,57 +1159,64 @@ void WS2812FX::finalizeInit() {
 
   _hasWhiteChannel = _isOffRefreshRequired = false;
   BusManager::removeAll();
-
+  // TODO: ideally we would free everything segment related here to reduce fragmentation (pixel buffers, ledamp, segments, etc) but that somehow leads to heap corruption if touchig any of the buffers.
   unsigned digitalCount = 0;
   #if defined(ARDUINO_ARCH_ESP32) && !defined(CONFIG_IDF_TARGET_ESP32C3)
-  // determine if it is sensible to use parallel I2S outputs on ESP32 (i.e. more than 5 outputs = 1 I2S + 4 RMT)
-  unsigned maxLedsOnBus = 0;
-  unsigned busType = 0;
+  // validate the bus config: count I2S buses and check if they meet requirements
+  unsigned i2sBusCount = 0;
+
   for (const auto &bus : busConfigs) {
     if (Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type)) {
       digitalCount++;
-      if (busType == 0) busType = bus.type; // remember first bus type
-      if (busType != bus.type) {
-        DEBUG_PRINTF_P(PSTR("Mixed digital bus types detected! Forcing single I2S output.\n"));
-        useParallelI2S = false; // mixed bus types, no parallel I2S
-      }
-      if (bus.count > maxLedsOnBus) maxLedsOnBus = bus.count;
+      if (bus.driverType == 1)
+        i2sBusCount++;
     }
   }
-  DEBUG_PRINTF_P(PSTR("Maximum LEDs on a bus: %u\nDigital buses: %u\n"), maxLedsOnBus, digitalCount);
-  // we may remove 600 LEDs per bus limit when NeoPixelBus is updated beyond 2.8.3
-  if (maxLedsOnBus <= 600 && useParallelI2S) BusManager::useParallelOutput(); // must call before creating buses
-  else useParallelI2S = false; // enforce single I2S
-  digitalCount = 0;
+  DEBUG_PRINTF_P(PSTR("Digital buses: %u, I2S buses: %u\n"), digitalCount, i2sBusCount);
+
+  // Determine parallel vs single I2S usage (used for memory calculation only)
+  bool useParallelI2S = false;
+  #if defined(CONFIG_IDF_TARGET_ESP32S3)
+  // ESP32-S3 always uses parallel LCD driver for I2S
+  if (i2sBusCount > 0) {
+    useParallelI2S = true;
+  }
+  #else
+  if (i2sBusCount > 1) {
+    useParallelI2S = true;
+  }
+  #endif
   #endif
 
   DEBUG_PRINTF_P(PSTR("Heap before buses: %d\n"), getFreeHeapSize());
   // create buses/outputs
-  unsigned mem = 0;
-  unsigned maxI2S = 0;
-  for (auto bus : busConfigs) {
+  unsigned mem = 0; // memory estimation including DMA buffer for I2S and pixel buffers
+  unsigned I2SdmaMem = 0;
+  for (auto &bus : busConfigs) {
+    // assign bus types: call to getI() determines bus types/drivers, allocates and tracks polybus channels
+    // store the result in iType for later use during bus creation (getI() must only be called once per BusConfig)
+    // note: this needs to be determined for all buses prior to creating them as it also determines parallel I2S usage
+    bus.iType = BusManager::getI(bus.type, bus.pins, bus.driverType);
+  }
+  for (auto &bus : busConfigs) {
     bool use_placeholder = false;
-    unsigned busMemUsage = bus.memUsage(Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type) ? digitalCount++ : 0); // does not include DMA/RMT buffer
-    // estimate maximum I2S memory usage (only relevant for digital non-2pin busses)
+    unsigned busMemUsage = bus.memUsage(); // does not include DMA/RMT buffer but includes pixel buffers (segment buffer + global buffer)
+    mem += busMemUsage;
+    // estimate maximum I2S memory usage (only relevant for digital non-2pin busses when I2S is enabled)
     #if !defined(CONFIG_IDF_TARGET_ESP32C3) && !defined(ESP8266)
-      #if defined(CONFIG_IDF_TARGET_ESP32) || defined(CONFIG_IDF_TARGET_ESP32S3)
-    const bool usesI2S = ((useParallelI2S && digitalCount <= 8) || (!useParallelI2S && digitalCount == 1));
-      #elif defined(CONFIG_IDF_TARGET_ESP32S2)
-    const bool usesI2S = (useParallelI2S && digitalCount <= 8);
-      #else
-    const bool usesI2S = false;
-      #endif
+    bool usesI2S = (bus.iType & 0x01) == 0; // I2S bus types are even numbered, can't use bus.driverType == 1 as getI() may have defaulted to RMT
     if (Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type) && usesI2S) {
       #ifdef NPB_CONF_4STEP_CADENCE
       constexpr unsigned stepFactor = 4; // 4 step cadence (4 bits per pixel bit)
       #else
       constexpr unsigned stepFactor = 3; // 3 step cadence (3 bits per pixel bit)
       #endif
-      unsigned i2sCommonSize = stepFactor * bus.count * (3*Bus::hasRGB(bus.type)+Bus::hasWhite(bus.type)+Bus::hasCCT(bus.type)) * (Bus::is16bit(bus.type)+1);
-      if (i2sCommonSize > maxI2S) maxI2S = i2sCommonSize;
+      unsigned i2sCommonMem = (stepFactor * bus.count * (3*Bus::hasRGB(bus.type)+Bus::hasWhite(bus.type)+Bus::hasCCT(bus.type)) * (Bus::is16bit(bus.type)+1));
+      if (useParallelI2S) i2sCommonMem *= 8; // parallel I2S uses 8 channels, requiring 8x the DMA buffer size (common buffer shared between all parallel busses)
+      if (i2sCommonMem > I2SdmaMem) I2SdmaMem = i2sCommonMem;
     }
     #endif
-    if (mem + busMemUsage + maxI2S > MAX_LED_MEMORY) {
+    if (mem + I2SdmaMem > MAX_LED_MEMORY + 1024) { // +1k to allow some margin to not drop buses that are allowed in UI (calculation here includes bus overhead)
       DEBUG_PRINTF_P(PSTR("Bus %d with %d LEDS memory usage exceeds limit\n"), (int)bus.type, bus.count);
       errorFlag = ERR_NORAM; // alert UI  TODO: make this a distinct error: not enough memory for bus
       use_placeholder = true;
@@ -1219,7 +1226,7 @@ void WS2812FX::finalizeInit() {
       if (Bus::isDigital(bus.type) && !Bus::is2Pin(bus.type) && BusManager::busses.back()->isPlaceholder()) digitalCount--; // remove placeholder from digital count
     }
   }
-  DEBUG_PRINTF_P(PSTR("LED buffer size: %uB/%uB\n"), mem + maxI2S, BusManager::memUsage());
+  DEBUG_PRINTF_P(PSTR("Estimated buses + pixel-buffers size: %uB\n"), mem + I2SdmaMem);
   busConfigs.clear();
   busConfigs.shrink_to_fit();
 

wled00/bus_manager.cpp

@@ -27,7 +27,6 @@
 
 extern char cmDNS[];
 extern bool cctICused;
-extern bool useParallelI2S;
 
 // functions to get/set bits in an array - based on functions created by Brandon for GOL
 //  toDo : make this a class that's completely defined in a header file
@@ -117,15 +116,17 @@ uint32_t Bus::autoWhiteCalc(uint32_t c) const {
 }
 
 
-BusDigital::BusDigital(const BusConfig &bc, uint8_t nr)
+BusDigital::BusDigital(const BusConfig &bc)
 : Bus(bc.type, bc.start, bc.autoWhite, bc.count, bc.reversed, (bc.refreshReq || bc.type == TYPE_TM1814))
 , _skip(bc.skipAmount) //sacrificial pixels
 , _colorOrder(bc.colorOrder)
 , _milliAmpsPerLed(bc.milliAmpsPerLed)
 , _milliAmpsMax(bc.milliAmpsMax)
+, _driverType(bc.driverType) // Store driver preference (0=RMT, 1=I2S)
 {
   DEBUGBUS_PRINTLN(F("Bus: Creating digital bus."));
   if (!isDigital(bc.type) || !bc.count) { DEBUGBUS_PRINTLN(F("Not digial or empty bus!")); return; }
+
   if (!PinManager::allocatePin(bc.pins[0], true, PinOwner::BusDigital)) { DEBUGBUS_PRINTLN(F("Pin 0 allocated!")); return; }
   _frequencykHz = 0U;
   _colorSum = 0;
@@ -139,28 +140,32 @@ BusDigital::BusDigital(const BusConfig &bc, uint8_t nr)
     _pins[1] = bc.pins[1];
     _frequencykHz = bc.frequency ? bc.frequency : 2000U; // 2MHz clock if undefined
   }
-  _iType = PolyBus::getI(bc.type, _pins, nr);
+
+  _iType = bc.iType; // reuse the iType that was determined by polyBus in getI() in finalizeInit()
   if (_iType == I_NONE) { DEBUGBUS_PRINTLN(F("Incorrect iType!")); return; }
   _hasRgb = hasRGB(bc.type);
   _hasWhite = hasWhite(bc.type);
   _hasCCT = hasCCT(bc.type);
   uint16_t lenToCreate = bc.count;
   if (bc.type == TYPE_WS2812_1CH_X3) lenToCreate = NUM_ICS_WS2812_1CH_3X(bc.count); // only needs a third of "RGB" LEDs for NeoPixelBus
-  _busPtr = PolyBus::create(_iType, _pins, lenToCreate + _skip, nr);
+  _busPtr = PolyBus::create(_iType, _pins, lenToCreate + _skip);
   _valid = (_busPtr != nullptr) && bc.count > 0;
   // fix for wled#4759
   if (_valid) for (unsigned i = 0; i < _skip; i++) {
     PolyBus::setPixelColor(_busPtr, _iType, i, 0, COL_ORDER_GRB); // set sacrificial pixels to black (CO does not matter here)
   }
-  DEBUGBUS_PRINTF_P(PSTR("Bus: %successfully inited #%u (len:%u, type:%u (RGB:%d, W:%d, CCT:%d), pins:%u,%u [itype:%u] mA=%d/%d)\n"),
-    _valid?"S":"Uns",
-    (int)nr,
+  else {
+    cleanup();
+  }
+  DEBUGBUS_PRINTF_P(PSTR("Bus len:%u, type:%u (RGB:%d, W:%d, CCT:%d), pins:%u,%u [itype:%u, driver:%s] mA=%d/%d %s\n"),
     (int)bc.count,
     (int)bc.type,
     (int)_hasRgb, (int)_hasWhite, (int)_hasCCT,
     (unsigned)_pins[0], is2Pin(bc.type)?(unsigned)_pins[1]:255U,
     (unsigned)_iType,
-    (int)_milliAmpsPerLed, (int)_milliAmpsMax
+    isI2S() ? "I2S" : "RMT",
+    (int)_milliAmpsPerLed, (int)_milliAmpsMax,
+    _valid ? " " : "FAILED"
   );
 }
 
@@ -351,6 +356,10 @@ std::vector<LEDType> BusDigital::getLEDTypes() {
   };
 }
 
+bool BusDigital::isI2S() {
+  return (_iType & 0x01) == 0; // I2S types have even iType values
+}
+
 void BusDigital::begin() {
   if (!_valid) return;
   PolyBus::begin(_busPtr, _iType, _pins, _frequencykHz);
@@ -1105,7 +1114,7 @@ size_t BusHub75Matrix::getPins(uint8_t* pinArray) const {
 #endif
 // ***************************************************************************
 
-BusPlaceholder::BusPlaceholder(const BusConfig &bc) 
+BusPlaceholder::BusPlaceholder(const BusConfig &bc)
 : Bus(bc.type, bc.start, bc.autoWhite, bc.count, bc.reversed, bc.refreshReq)
 , _colorOrder(bc.colorOrder)
 , _skipAmount(bc.skipAmount)
@@ -1125,47 +1134,20 @@ size_t BusPlaceholder::getPins(uint8_t* pinArray) const {
   return nPins;
 }
 
-//utility to get the approx. memory usage of a given BusConfig
-size_t BusConfig::memUsage(unsigned nr) const {
+//utility to get the approx. memory usage of a given BusConfig inclduding segmentbuffer and global buffer (4 bytes per pixel)
+size_t BusConfig::memUsage() const {
+  size_t mem = (count + skipAmount) * 8; // 8 bytes per pixel for segment + global buffer
   if (Bus::isVirtual(type)) {
-    return sizeof(BusNetwork) + (count * Bus::getNumberOfChannels(type));
+    mem += sizeof(BusNetwork) + (count * Bus::getNumberOfChannels(type)); // note: getNumberOfChannels() includes CCT channel if applicable but virtual buses do not use CCT channel buffer
   } else if (Bus::isDigital(type)) {
     // if any of digital buses uses I2S, there is additional common I2S DMA buffer not accounted for here
-    return sizeof(BusDigital) + PolyBus::memUsage(count + skipAmount, PolyBus::getI(type, pins, nr));
+    mem += sizeof(BusDigital) + PolyBus::memUsage(count + skipAmount, iType);
   } else if (Bus::isOnOff(type)) {
-    return sizeof(BusOnOff);
+    mem += sizeof(BusOnOff);
   } else {
-    return sizeof(BusPwm);
-  }
-}
-
-
-size_t BusManager::memUsage() {
-  // when ESP32, S2 & S3 use parallel I2S only the largest bus determines the total memory requirements for back buffers
-  // front buffers are always allocated per bus
-  unsigned size = 0;
-  unsigned maxI2S = 0;
-  #if !defined(CONFIG_IDF_TARGET_ESP32C3) && !defined(ESP8266)
-  unsigned digitalCount = 0;
-  #endif
-  for (const auto &bus : busses) {
-    size += bus->getBusSize();
-    #if !defined(CONFIG_IDF_TARGET_ESP32C3) && !defined(ESP8266)
-    if (bus->isDigital() && !bus->is2Pin()) {
-      digitalCount++;
-      if ((PolyBus::isParallelI2S1Output() && digitalCount <= 8) || (!PolyBus::isParallelI2S1Output() && digitalCount == 1)) {
-        #ifdef NPB_CONF_4STEP_CADENCE
-        constexpr unsigned stepFactor = 4; // 4 step cadence (4 bits per pixel bit)
-        #else
-        constexpr unsigned stepFactor = 3; // 3 step cadence (3 bits per pixel bit)
-        #endif
-        unsigned i2sCommonSize = stepFactor * bus->getLength() * bus->getNumberOfChannels() * (bus->is16bit()+1);
-        if (i2sCommonSize > maxI2S) maxI2S = i2sCommonSize;
-      }
-    }
-    #endif
+    mem += sizeof(BusPwm);
   }
-  return size + maxI2S;
+  return mem;
 }
 
 int BusManager::add(const BusConfig &bc, bool placeholder) {
@@ -1190,7 +1172,7 @@ int BusManager::add(const BusConfig &bc, bool placeholder) {
     busses.push_back(make_unique<BusHub75Matrix>(bc));
 #endif
   } else if (Bus::isDigital(bc.type)) {
-    busses.push_back(make_unique<BusDigital>(bc, Bus::is2Pin(bc.type) ? twoPin : digital));
+    busses.push_back(make_unique<BusDigital>(bc));
   } else if (Bus::isOnOff(bc.type)) {
     busses.push_back(make_unique<BusOnOff>(bc));
   } else {
@@ -1228,49 +1210,35 @@ String BusManager::getLEDTypesJSONString() {
   return json;
 }
 
-void BusManager::useParallelOutput() {
-  DEBUGBUS_PRINTLN(F("Bus: Enabling parallel I2S."));
-  PolyBus::setParallelI2S1Output();
+uint8_t BusManager::getI(uint8_t busType, const uint8_t* pins, uint8_t driverPreference) {
+  return PolyBus::getI(busType, pins, driverPreference);
 }
-
-bool BusManager::hasParallelOutput() {
-  return PolyBus::isParallelI2S1Output();
-}
-
 //do not call this method from system context (network callback)
 void BusManager::removeAll() {
   DEBUGBUS_PRINTLN(F("Removing all."));
   //prevents crashes due to deleting busses while in use.
   while (!canAllShow()) yield();
   busses.clear();
-  PolyBus::setParallelI2S1Output(false);
+  #ifndef ESP8266
+  // Reset channel tracking for fresh allocation
+  PolyBus::resetChannelTracking();
+  #endif
 }
 
 #ifdef ESP32_DATA_IDLE_HIGH
 // #2478
 // If enabled, RMT idle level is set to HIGH when off
 // to prevent leakage current when using an N-channel MOSFET to toggle LED power
+// since I2S outputs are known only during config of buses, lets just assume RMT is used for digital buses
+// unused RMT channels should have no effect
 void BusManager::esp32RMTInvertIdle() {
   bool idle_out;
   unsigned rmt = 0;
   unsigned u = 0;
   for (auto &bus : busses) {
     if (bus->getLength()==0 || !bus->isDigital() || bus->is2Pin()) continue;
-    #if defined(CONFIG_IDF_TARGET_ESP32C3)    // 2 RMT, only has 1 I2S but NPB does not support it ATM
-      if (u > 1) return;
-      rmt = u;
-    #elif defined(CONFIG_IDF_TARGET_ESP32S2)  // 4 RMT, only has 1 I2S bus, supported in NPB
-      if (u > 3) return;
-      rmt = u;
-    #elif defined(CONFIG_IDF_TARGET_ESP32S3)  // 4 RMT, has 2 I2S but NPB does not support them ATM
-      if (u > 3) return;
-      rmt = u;
-    #else
-      unsigned numI2S = !PolyBus::isParallelI2S1Output(); // if using parallel I2S, RMT is used 1st
-      if (numI2S > u) continue;
-      if (u > 7 + numI2S) return;
-      rmt = u - numI2S;
-    #endif
+    if (static_cast<BusDigital*>(bus.get())->isI2S()) continue;
+    if (u >= WLED_MAX_RMT_CHANNELS) return;
     //assumes that bus number to rmt channel mapping stays 1:1
     rmt_channel_t ch = static_cast<rmt_channel_t>(rmt);
     rmt_idle_level_t lvl;
@@ -1445,9 +1413,15 @@ void BusManager::applyABL() {
 
 ColorOrderMap& BusManager::getColorOrderMap() { return _colorOrderMap; }
 
-
+#ifndef ESP8266
+// PolyBus channel tracking for dynamic allocation
 bool PolyBus::_useParallelI2S = false;
-
+uint8_t PolyBus::_rmtChannelsAssigned = 0; // number of RMT channels assigned durig getI() check
+uint8_t PolyBus::_rmtChannel = 0;     // number of RMT channels actually used during bus creation in create()
+uint8_t PolyBus::_i2sChannelsAssigned = 0; // number of I2S channels assigned durig getI() check
+uint8_t PolyBus::_parallelBusItype = 0;    // type I_NONE
+uint8_t PolyBus::_2PchannelsAssigned = 0;
+#endif
 // Bus static member definition
 int16_t Bus::_cct = -1;
 uint8_t Bus::_cctBlend = 0; // 0 - 127