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index 0633b875c..6777a4dcb 100644
--- a/etc/visual-studio/UnitTests.vcxproj
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+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>NDEBUG;_LIB;MBEDTLS_CONFIG_FILE="mbedtls-config.h";OPENTHREAD_CONFIG_FILE="openthread-windows-config.h";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <SDLCheck>true</SDLCheck>
+      <AdditionalIncludeDirectories>..\..\include;..\..\src;..\..\src\core;..\..\third_party\mbedtls;..\..\third_party\mbedtls\repo\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/etc/visual-studio/libopenthread-ncp-uart.vcxproj.filters b/etc/visual-studio/libopenthread-ncp-uart.vcxproj.filters
new file mode 100644
index 000000000..1c903f4ab
--- /dev/null
+++ b/etc/visual-studio/libopenthread-ncp-uart.vcxproj.filters
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\src\ncp\flen.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\ncp\hdlc.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\ncp\ncp_base.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\ncp\ncp_buffer.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\ncp\ncp_uart.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\src\ncp\spinel.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\src\ncp\flen.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\ncp\hdlc.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\ncp\ncp_base.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\ncp\ncp_buffer.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\ncp\ncp_uart.hpp">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\ncp\spinel.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/etc/visual-studio/openthread.sln b/etc/visual-studio/openthread.sln
index 150034748..b8f99d146 100644
--- a/etc/visual-studio/openthread.sln
+++ b/etc/visual-studio/openthread.sln
@@ -34,6 +34,14 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libopenthread-cli", "libope
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ot-cli", "ot-cli.vcxproj", "{91D3ADEA-F1FE-4433-95B6-F8F6A7CF7BAF}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libopenthread-ncp-spi", "libopenthread-ncp-spi.vcxproj", "{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libopenthread-ncp-uart", "libopenthread-ncp-uart.vcxproj", "{D94867D2-6DAE-47E2-962A-5E8E658134D1}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ot-ncp-spi", "ot-ncp-spi.vcxproj", "{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ot-ncp-uart", "ot-ncp-uart.vcxproj", "{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -110,6 +118,38 @@ Global
 		{91D3ADEA-F1FE-4433-95B6-F8F6A7CF7BAF}.Release|x64.Build.0 = Release|x64
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 		{91D3ADEA-F1FE-4433-95B6-F8F6A7CF7BAF}.Release|x86.Build.0 = Release|Win32
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Debug|x64.ActiveCfg = Debug|x64
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Debug|x64.Build.0 = Debug|x64
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Debug|x86.ActiveCfg = Debug|Win32
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Debug|x86.Build.0 = Debug|Win32
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Release|x64.ActiveCfg = Release|x64
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Release|x64.Build.0 = Release|x64
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Release|x86.ActiveCfg = Release|Win32
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2}.Release|x86.Build.0 = Release|Win32
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Debug|x64.ActiveCfg = Debug|x64
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Debug|x64.Build.0 = Debug|x64
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Debug|x86.ActiveCfg = Debug|Win32
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Debug|x86.Build.0 = Debug|Win32
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Release|x64.ActiveCfg = Release|x64
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Release|x64.Build.0 = Release|x64
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Release|x86.ActiveCfg = Release|Win32
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1}.Release|x86.Build.0 = Release|Win32
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Debug|x64.ActiveCfg = Debug|x64
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Debug|x64.Build.0 = Debug|x64
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Debug|x86.ActiveCfg = Debug|Win32
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Debug|x86.Build.0 = Debug|Win32
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Release|x64.ActiveCfg = Release|x64
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Release|x64.Build.0 = Release|x64
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Release|x86.ActiveCfg = Release|Win32
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B}.Release|x86.Build.0 = Release|Win32
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Debug|x64.ActiveCfg = Debug|x64
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Debug|x64.Build.0 = Debug|x64
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Debug|x86.ActiveCfg = Debug|Win32
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Debug|x86.Build.0 = Debug|Win32
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Release|x64.ActiveCfg = Release|x64
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Release|x64.Build.0 = Release|x64
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Release|x86.ActiveCfg = Release|Win32
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -123,5 +163,9 @@ Global
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 		{91D3ADEA-F1FE-4433-95B6-F8F6A7CF7BAF} = {76EA541E-CAB1-4DB5-A39F-E3DB2A78CDDD}
+		{B92F449E-0FD9-44FC-ACFA-6521A3240CA2} = {95BD0669-04C8-4EEB-B3CC-0535B03F4468}
+		{D94867D2-6DAE-47E2-962A-5E8E658134D1} = {95BD0669-04C8-4EEB-B3CC-0535B03F4468}
+		{B4C744EC-B662-46C6-A076-FB58FA8FDF1B} = {76EA541E-CAB1-4DB5-A39F-E3DB2A78CDDD}
+		{9EEF9DCD-EA8F-4154-BD02-AB2B31CEC324} = {76EA541E-CAB1-4DB5-A39F-E3DB2A78CDDD}
 	EndGlobalSection
 EndGlobal
diff --git a/etc/visual-studio/ot-ncp-spi.vcxproj b/etc/visual-studio/ot-ncp-spi.vcxproj
new file mode 100644
index 000000000..5d4429da8
--- /dev/null
+++ b/etc/visual-studio/ot-ncp-spi.vcxproj
@@ -0,0 +1,184 @@
+<?xml version="1.0" encoding="utf-8"?>
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+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
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+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
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+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
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+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>Thread</RootNamespace>
+    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
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+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v140</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
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+    <Link>
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+      <AdditionalDependencies>..\..\build\bin\$(Platform)\$(Configuration)\lib\libopenthread.lib;..\..\build\bin\$(Platform)\$(Configuration)\lib\libopenthread-ncp-spi.lib;..\..\build\bin\$(Platform)\$(Configuration)\lib\mbedtls.lib;..\..\build\bin\$(Platform)\$(Configuration)\lib\libopenthread-windows.lib;ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
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+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
\ No newline at end of file
diff --git a/etc/visual-studio/ot-ncp-spi.vcxproj.filters b/etc/visual-studio/ot-ncp-spi.vcxproj.filters
new file mode 100644
index 000000000..3cfd287ac
--- /dev/null
+++ b/etc/visual-studio/ot-ncp-spi.vcxproj.filters
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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\ No newline at end of file
diff --git a/etc/visual-studio/ot-ncp-uart.vcxproj b/etc/visual-studio/ot-ncp-uart.vcxproj
new file mode 100644
index 000000000..b9d4b82e9
--- /dev/null
+++ b/etc/visual-studio/ot-ncp-uart.vcxproj
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diff --git a/etc/visual-studio/ot-ncp-uart.vcxproj.filters b/etc/visual-studio/ot-ncp-uart.vcxproj.filters
new file mode 100644
index 000000000..3cfd287ac
--- /dev/null
+++ b/etc/visual-studio/ot-ncp-uart.vcxproj.filters
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diff --git a/src/ncp/ncp_uart.cpp b/src/ncp/ncp_uart.cpp
index f2ed1db91..f81042eb6 100644
--- a/src/ncp/ncp_uart.cpp
+++ b/src/ncp/ncp_uart.cpp
@@ -30,6 +30,12 @@
  *   This file contains definitions for a UART based NCP interface to the OpenThread stack.
  */
 
+#ifdef OPENTHREAD_CONFIG_FILE
+#include OPENTHREAD_CONFIG_FILE
+#else
+#include <openthread-config.h>
+#endif
+
 #include <stdio.h>
 #include <ncp/ncp.h>
 #include <common/code_utils.hpp>
diff --git a/tests/unit/test_windows.cpp b/tests/unit/test_windows.cpp
index d374b411f..94aa0d610 100644
--- a/tests/unit/test_windows.cpp
+++ b/tests/unit/test_windows.cpp
@@ -64,6 +64,12 @@ namespace Thread
 // test_message.cpp
 void TestMessage();
 
+// test_ncp_buffer.cpp
+namespace Thread
+{
+    void TestNcpFrameBuffer(void);
+}
+
 // test_timer.cpp
 int TestOneTimer();
 int TestTenTimers();
@@ -117,6 +123,9 @@ namespace Thread
         TEST_METHOD(TestOneTimer) { ::TestOneTimer(); }
         TEST_METHOD(TestTenTimers) { ::TestTenTimers(); }
 
+        // test_ncp_buffer.cpp
+        TEST_METHOD(TestNcpFrameBuffer) { Thread::TestNcpFrameBuffer(); }
+
         // test_toolchain.cpp
         TEST_METHOD(test_packed1) { ::test_packed1(); }
         TEST_METHOD(test_packed2) { ::test_packed2(); }