add commitNonVolatileMemory overload to batch write chars n times to flash

src/knx/platform.cpp

@@ -201,6 +201,37 @@ uint32_t Platform::writeNonVolatileMemory(uint32_t relativeAddress, uint8_t* buf
     }
 }
 
+// writes value repeat times into flash starting at relativeAddress
+// returns next free relativeAddress
+uint32_t Platform::writeNonVolatileMemory(uint32_t relativeAddress, uint8_t value, size_t repeat)
+{
+    if(_memoryType == Flash)
+    {
+        while (repeat > 0)
+        {
+            loadEraseblockContaining(relativeAddress);
+            uint32_t start = _bufferedEraseblockNumber * (flashEraseBlockSize() * flashPageSize());
+            uint32_t end = start +  (flashEraseBlockSize() * flashPageSize());
+
+            uint32_t offset = relativeAddress - start;
+            uint32_t length = end - relativeAddress;
+            if(length > repeat)
+                length = repeat;
+            memset(_eraseblockBuffer + offset, value, length);
+            _bufferedEraseblockDirty = true;
+
+            relativeAddress += length;
+            repeat -= length;
+        }
+        return relativeAddress;
+    }
+    else
+    {
+        memset(getEepromBuffer(KNX_FLASH_SIZE)+relativeAddress, value, repeat);
+        return relativeAddress+repeat;
+    }
+}
+
 void Platform::loadEraseblockContaining(uint32_t relativeAddress)
 {
     int32_t blockNum = getEraseBlockNumberOf(relativeAddress);

src/knx/platform.h

@@ -70,6 +70,7 @@ class Platform
     virtual void commitNonVolatileMemory();
     // address is relative to start of nonvolatile memory
     virtual uint32_t writeNonVolatileMemory(uint32_t relativeAddress, uint8_t* buffer, size_t size);
+    virtual uint32_t writeNonVolatileMemory(uint32_t relativeAddress, uint8_t value, size_t repeat);
 
     NvMemoryType NonVolatileMemoryType();
     void NonVolatileMemoryType(NvMemoryType type);