diff --git a/IR_Encoder.cpp b/IR_Encoder.cpp
index 8663ccb..62ec179 100644
--- a/IR_Encoder.cpp
+++ b/IR_Encoder.cpp
@@ -352,6 +352,29 @@ bool IR_Encoder::txEmitTick(TxFsmState &st, const uint8_t *sendBufferLocal, bool
     return txAdvanceAfterOutput(st, sendBufferLocal);
 }
 
+// Обход кадра по границам ранов: между границами автомат выдаёт st.toggleCounter+1 тактов
+// уровня st.state (txAdvanceAfterOutput считает toggleCounter до нуля, затем txAdvanceBoundary
+// открывает следующий ран). Даёт ту же последовательность тактов, что потиковый обход, но за
+// число шагов = число ранов (пинг: ~230 вместо ~8700 тактов — на 12 МГц это ~30 мс перед стартом DMA).
+template <typename Emit>
+bool IR_Encoder::txWalkRuns(TxFsmState &st, const uint8_t *sendBufferLocal, Emit emit)
+{
+    for (;;)
+    {
+        const bool gate = st.state;
+        const uint32_t lenTicks = (uint32_t)st.toggleCounter + 1U;
+        if (!emit(gate, lenTicks))
+        {
+            return false;
+        }
+        st.toggleCounter = 0;
+        if (!txAdvanceBoundary(st, sendBufferLocal))
+        {
+            return true;
+        }
+    }
+}
+
 void IR_Encoder::loadTxFsmFromMembers(TxFsmState &st) const
 {
     st.sendLen = sendLen;
@@ -476,28 +499,27 @@ size_t IR_Encoder::buildGateRuns(const uint8_t *packet, uint8_t len, IR_TxGateRu
     st.currentBitSequence = bitHigh;
 
     size_t runCount = 0;
-    bool isActive = true;
-    while (isActive)
-    {
-        bool gate = false;
-        isActive = txEmitTick(st, sendBufferLocal, gate);
-
+    const bool ok = txWalkRuns(st, sendBufferLocal, [&](bool gate, uint32_t lenTicks) -> bool {
         if (runCount > 0 && outRuns[runCount - 1].gate == gate)
         {
-            outRuns[runCount - 1].lenTicks = (uint16_t)(outRuns[runCount - 1].lenTicks + 1U);
-        }
-        else
-        {
-            if (runCount >= maxRuns)
+            const uint32_t merged = (uint32_t)outRuns[runCount - 1].lenTicks + lenTicks;
+            if (merged > 65535U)
             {
-                return 0;
+                return false;
             }
-            outRuns[runCount].gate = gate;
-            outRuns[runCount].lenTicks = 1U;
-            runCount++;
+            outRuns[runCount - 1].lenTicks = (uint16_t)merged;
+            return true;
         }
-    }
-    return runCount;
+        if (runCount >= maxRuns || lenTicks > 65535U)
+        {
+            return false;
+        }
+        outRuns[runCount].gate = gate;
+        outRuns[runCount].lenTicks = (uint16_t)lenTicks;
+        runCount++;
+        return true;
+    });
+    return ok ? runCount : 0;
 }
 
 size_t IR_Encoder::buildPhysicalGateRuns(const uint8_t *packet, uint8_t len, IR_TxGateRun *outRuns, size_t maxRuns, uint16_t multiply)
@@ -564,40 +586,29 @@ size_t IR_Encoder::buildPhysicalGateRuns(const uint8_t *packet, uint8_t len, IR_
     bool currentGate = false;
     uint32_t currentLogicalLen = 0;
     bool havePendingRun = false;
-    bool isActive = true;
-    while (isActive)
-    {
-        bool gate = false;
-        isActive = txEmitTick(st, sendBufferLocal, gate);
-
-        if (!havePendingRun)
+    const bool ok = txWalkRuns(st, sendBufferLocal, [&](bool gate, uint32_t lenTicks) -> bool {
+        if (havePendingRun && currentGate == gate)
         {
-            currentGate = gate;
-            currentLogicalLen = 1U;
-            havePendingRun = true;
-            continue;
+            currentLogicalLen += lenTicks;
+            return true;
         }
-
-        if (currentGate == gate)
+        if (havePendingRun && !appendPhysicalRun(currentGate, currentLogicalLen, runCount))
         {
-            currentLogicalLen++;
-            continue;
+            return false;
         }
-
-        if (!appendPhysicalRun(currentGate, currentLogicalLen, runCount))
-        {
-            return 0;
-        }
-
         currentGate = gate;
-        currentLogicalLen = 1U;
+        currentLogicalLen = lenTicks;
+        havePendingRun = true;
+        return true;
+    });
+    if (!ok)
+    {
+        return 0;
     }
-
     if (havePendingRun && !appendPhysicalRun(currentGate, currentLogicalLen, runCount))
     {
         return 0;
     }
-
     return runCount;
 }
 
diff --git a/IR_Encoder.h b/IR_Encoder.h
index af097cf..df55d86 100644
--- a/IR_Encoder.h
+++ b/IR_Encoder.h
@@ -214,6 +214,8 @@ private:
     static bool txAdvanceBoundary(TxFsmState &st, const uint8_t *sendBufferLocal);
     static bool txAdvanceAfterOutput(TxFsmState &st, const uint8_t *sendBufferLocal);
     static bool txEmitTick(TxFsmState &st, const uint8_t *sendBufferLocal, bool &gateOut);
+    template <typename Emit>
+    static bool txWalkRuns(TxFsmState &st, const uint8_t *sendBufferLocal, Emit emit);
     void loadTxFsmFromMembers(TxFsmState &st) const;
     void storeTxFsmToMembers(const TxFsmState &st);
     bool shouldUseBufferedIsr() const;