dotnet · pgrawehr · Nov 12, 2025 · Nov 13, 2025 · Nov 23, 2025 · Nov 30, 2025
diff --git a/Directory.Build.props b/Directory.Build.props
@@ -17,7 +17,7 @@
 
   <PropertyGroup>
     <Language>C#</Language>
-    <LangVersion>9</LangVersion>
+    <LangVersion>12</LangVersion>
     <IncludeSymbols>true</IncludeSymbols>
   </PropertyGroup>
 

diff --git a/eng/ArduinoCsCI.cmd b/eng/ArduinoCsCI.cmd
@@ -5,7 +5,7 @@ REM Second argument is either "Debug" or "Release"
 if %1!==! goto :usage
 
 REM Defines the revision to check out in the ExtendedConfigurableFirmata repo
-set FIRMATA_SIMULATOR_CHECKOUT_REVISION=a354343cebc35964450dfa01dba2cd996065fd5c
+set FIRMATA_SIMULATOR_CHECKOUT_REVISION=f70a361765adedd5752a7578d5bb77e55f268e38
 set RUN_COMPILER_TESTS=FALSE
 
 choco install -y --no-progress arduino-cli

diff --git a/samples/Directory.Build.props b/samples/Directory.Build.props
@@ -13,7 +13,7 @@
     <MainLibraryPath>$(MSBuildThisFileDirectory)../src/System.Device.Gpio/</MainLibraryPath>
     <IotBindingsLibraryPath>$(MSBuildThisFileDirectory)../src/Iot.Device.Bindings/</IotBindingsLibraryPath>
     <Nullable>enable</Nullable>
-    <LangVersion>9</LangVersion>
+    <LangVersion>12</LangVersion>
   </PropertyGroup>
 
   <!--

diff --git a/samples/README.md b/samples/README.md
@@ -20,11 +20,11 @@ The following samples demonstrate various scenarios:
 
 ## Requirements
 
-The .NET IoT APIs require using at least .NET Core 2.1. [.NET Core 3.1](https://dotnet.microsoft.com/download/dotnet-core/3.1) or higher is recommended, and is required for ARM64.
+The .NET IoT APIs require using at least .NET 8.0.
 
-Many of these samples use the [Raspberry Pi](https://www.raspberrypi.org/), however, .NET Core can be used with other devices. .NET Core is supported on Raspberry Pi 2B as well as 3 and 4 models (ARMv7/v8). .NET Core is not supported on Raspberry Pi Zero or Arduino.
+Many of these samples use the [Raspberry Pi](https://www.raspberrypi.org/), however, .NET Core can be used with other devices. .NET is supported on Raspberry Pi 2B as well as 3 and 4 models (ARMv7/v8). .NET is not supported on Raspberry Pi Zero or Arduino. For the later ones, there are alternatives like NanoFramework or our own Arduino Compiler.
 
-We primarily test the IoT APIs on Debian Linux, although we expect them to work on most Linux distros. We do not test on Windows.
+We primarily test the IoT APIs on Debian Linux, although we expect them to work on most Linux distros. On Windows, we test using USB devices, such as FT-4222 or Arduino interfaces.
 
 ## Resources
 

diff --git a/src/Iot.Device.Bindings.SkiaSharpAdapter/Iot.Device.Bindings.SkiaSharpAdapter.csproj b/src/Iot.Device.Bindings.SkiaSharpAdapter/Iot.Device.Bindings.SkiaSharpAdapter.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>net8.0</TargetFrameworks>
-    <LangVersion>10</LangVersion>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <EnableDefaultItems>true</EnableDefaultItems>

diff --git a/src/Iot.Device.Bindings/Iot.Device.Bindings.csproj b/src/Iot.Device.Bindings/Iot.Device.Bindings.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>net8.0</TargetFrameworks>
-    <LangVersion>10</LangVersion>
     <Nullable>enable</Nullable>
     <DefineConstants>$(DefineConstants);BUILDING_IOT_DEVICE_BINDINGS</DefineConstants>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>

diff --git a/src/System.Device.Gpio.Tests/System.Device.Gpio.Tests.csproj b/src/System.Device.Gpio.Tests/System.Device.Gpio.Tests.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
-    <LangVersion>10</LangVersion>
     <IsPackable>false</IsPackable>
     <!-- Keep quiet about duplicate package references from props files -->
     <NoWarn>$(NoWarn);NETSDK1023</NoWarn>

diff --git a/src/System.Device.Gpio/System.Device.Gpio.csproj b/src/System.Device.Gpio/System.Device.Gpio.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net8.0</TargetFrameworks>
-    <LangVersion>10</LangVersion>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPackable>true</IsPackable>

diff --git a/src/devices/Arduino/tests/Arduino.Tests.csproj b/src/devices/Arduino/tests/Arduino.Tests.csproj
@@ -2,7 +2,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(DefaultSampleTfms)</TargetFrameworks>
     <IsPackable>false</IsPackable>
-    <LangVersion>latest</LangVersion>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <!-- We don't want to run hardware test by default -->
     <VSTestTestCaseFilter Condition="'$(VSTestTestCaseFilter)'==''">requires!=hardware</VSTestTestCaseFilter>

diff --git a/src/devices/Blinkt/Blinkt.csproj b/src/devices/Blinkt/Blinkt.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>$(DefaultBindingTfms)</TargetFrameworks>
     <!--Disabling default items so samples source won't get build by the main library-->
     <EnableDefaultItems>false</EnableDefaultItems>
-    <LangVersion>9</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

diff --git a/src/devices/Bmm150/tests/Bmm150.Tests.csproj b/src/devices/Bmm150/tests/Bmm150.Tests.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(DefaultTestTfms)</TargetFrameworks>
-    <LangVersion>9</LangVersion>
     <IsPackable>false</IsPackable>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
   </PropertyGroup>

diff --git a/src/devices/Bmxx80/tests/Bmxx80.Tests.csproj b/src/devices/Bmxx80/tests/Bmxx80.Tests.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(DefaultTestTfms)</TargetFrameworks>
-    <LangVersion>9</LangVersion>
     <IsPackable>false</IsPackable>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
   </PropertyGroup>

diff --git a/src/devices/Board/Board.csproj b/src/devices/Board/Board.csproj
@@ -2,7 +2,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(DefaultBindingTfms)</TargetFrameworks>
     <EnableDefaultItems>false</EnableDefaultItems>
-    <LangVersion>preview</LangVersion>
     <RootNamespace>Iot.Device.Board</RootNamespace>
   </PropertyGroup>
   <ItemGroup>

diff --git a/src/devices/Board/tests/Board.Tests.csproj b/src/devices/Board/tests/Board.Tests.csproj
@@ -2,7 +2,6 @@
   <PropertyGroup>
     <TargetFramework>$(DefaultTestTfms)</TargetFramework>
     <IsPackable>false</IsPackable>
-    <LangVersion>latest</LangVersion>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <RootNamespace>Iot.Device.Board.Tests</RootNamespace>
   </PropertyGroup>

diff --git a/src/devices/Button/tests/Button.tests.csproj b/src/devices/Button/tests/Button.tests.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFramework>$(DefaultTestTfms)</TargetFramework>
     <IsPackable>false</IsPackable>
-    <LangVersion>latest</LangVersion>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <RootNamespace>Iot.Device.Button.Tests</RootNamespace>
   </PropertyGroup>

diff --git a/src/devices/Camera/Camera/Camera.csproj b/src/devices/Camera/Camera/Camera.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(DefaultBindingTfms)</TargetFrameworks>
     <Nullable>enable</Nullable>
-    <LangVersion>Latest</LangVersion>
     <RootNamespace>Iot.Device.$(MSBuildProjectName.Replace(" ", "_"))</RootNamespace>
   </PropertyGroup>
 

diff --git a/src/devices/Camera/samples/Camera.Samples/Camera.Samples.csproj b/src/devices/Camera/samples/Camera.Samples/Camera.Samples.csproj
@@ -4,7 +4,6 @@
     <TargetFramework>$(DefaultSampleTfms)</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-    <LangVersion>Latest</LangVersion>
     <OutputType>Exe</OutputType>
   </PropertyGroup>
 

diff --git a/src/devices/Camera/tests/FakeVideoCapture/FakeVideoCapture.csproj b/src/devices/Camera/tests/FakeVideoCapture/FakeVideoCapture.csproj
@@ -5,7 +5,6 @@
     <TargetFramework>$(DefaultSampleTfms)</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-    <LangVersion>Latest</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

diff --git a/src/devices/Camera/tests/TestCamera/TestCamera.csproj b/src/devices/Camera/tests/TestCamera/TestCamera.csproj
@@ -4,7 +4,6 @@
     <TargetFramework>$(DefaultTestTfms)</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
-    <LangVersion>Latest</LangVersion>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>

diff --git a/src/devices/CharacterLcd/tests/CharacterLcd.Tests.csproj b/src/devices/CharacterLcd/tests/CharacterLcd.Tests.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(DefaultTestTfms)</TargetFrameworks>
-    <LangVersion>9</LangVersion>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 

diff --git a/src/devices/Charlieplex/tests/Charlieplex.Tests.csproj b/src/devices/Charlieplex/tests/Charlieplex.Tests.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFramework>$(DefaultTestTfms)</TargetFramework>
-    <LangVersion>9</LangVersion>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 

diff --git a/src/devices/Common/Common.csproj b/src/devices/Common/Common.csproj
@@ -12,6 +12,7 @@
   <ItemGroup>
     <Compile Include="ClassVisibility.cs" />
     <Compile Include="MathExtensions.cs" />
+    <Compile Include="System\Device\I2c\I2cSimulatedDeviceBase.cs" />
     <Compile Include="Iot/Device/Common/*.cs" />
     <Compile Include="Iot/Device/Graphics/*.cs" />
     <Compile Include="Iot/Device/Multiplexing/*.cs" />