ide: the whole project in Solution Explorer, and a path Studio can resolve

Three things the solution got wrong, all found by opening it in the GUI rather
than building it headlessly.

The project listed only main.cpp, so none of the headers could be opened from
Solution Explorer. Every source and header is listed now, with <Link> mirroring
the on-disk src/ layout, which is what master's project did.

Neither configuration compiled in the GUI: libavr was found through
$(LIBAVR_ROOT), and a variable exported in a shell is not visible to Studio
launched from the Start menu. Release only looked healthy because its objects
were already up to date from a headless build. The path is now anchored to the
project directory, which also side-steps a second trap: a plain relative include
is resolved against the generated makefile's own directory, the configuration's
output directory, not the project's. Pinning libavr as a submodule would remove
the assumption that the two sit side by side, and is on libavr's task list.

Both configurations verified with LIBAVR_ROOT deliberately unset, Release still
byte-identical to the CMake build and the flag gate still green. Debug's own
translation unit carries DWARF-4 as intended.

Studio's per-user state under ide/.vs/ and the build logs are ignored.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitignore

@@ -1,2 +1,9 @@
 build/
 .cache/
+
+# Atmel Studio: generated per machine, and its build outputs
+ide/*.componentinfo.xml
+ide/Debug/
+ide/Release/
+ide/.vs/
+ide/*.log

README.md

@@ -19,4 +19,39 @@ LIBAVR_ROOT=/path/to/libavr cmake --preset atmega328p-generated
 cmake --build --preset atmega328p-generated
 ```
 
+## Atmel Studio
+
+`master` carries a Studio solution, so this branch does too: `ide/fantemp.atsln`
+builds the same firmware — byte-identical `.text` and `.data` to the CMake
+build — from the same sources, with the flags mirrored by hand.
+
+Studio expects libavr checked out **beside this repo**, and finds it at
+`$(MSBuildProjectDirectory)\..\..\libavr\include` — anchored to the project
+rather than written relative to the generated makefile, which runs from the
+configuration's output directory and would need a different number of `..`.
+Unlike the CMake build there is no `LIBAVR_ROOT` to point elsewhere: an
+environment variable set in a shell is not visible to Studio launched from the
+Start menu, which fails as a missing `libavr/libavr.hpp` rather than as anything
+about the variable. Pinning libavr as a submodule is the better answer and is on
+libavr's task list.
+
+It also needs a GCC 16.1 toolchain registered as flavour `avr-g++-16.1.0`;
+nothing older can compile `-std=c++26`.
+
+One generated file is required before the project will load, and one command
+checks the flags have not drifted (both from libavr's `tools/atmelstudio/`):
+
+```sh
+python ../libavr/tools/atmelstudio/componentinfo.py \
+    ide/fantemp.componentinfo.xml --device ATmega328P
+python ../libavr/tools/atmelstudio/check-flags.py --solution ide/fantemp.atsln \
+    --compile-commands build/atmega328p-generated/compile_commands.json \
+    --log build/atmelstudio.log
+```
+
+CMake remains the build system; the solution is there so the project opens in
+Studio as its predecessor did. Only the Release configuration is gated against
+CMake — the presets define no debug build — and Debug carries the `-Og
+-gdwarf-4` pair libavr's own debug preset uses.
+
 Legacy (yazoalfa submodules) stays on `master`.

ide/fantemp.atsln

@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Atmel Studio Solution File, Format Version 11.00
+VisualStudioVersion = 14.0.23107.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{E66E83B9-2572-4076-B26E-6BE79FF3018A}") = "fantemp", "fantemp.cppproj", "{4F0C1D92-6A5B-4E33-9A71-2C8F5B0D47AE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|AVR = Debug|AVR
+		Release|AVR = Release|AVR
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4F0C1D92-6A5B-4E33-9A71-2C8F5B0D47AE}.Debug|AVR.ActiveCfg = Debug|AVR
+		{4F0C1D92-6A5B-4E33-9A71-2C8F5B0D47AE}.Debug|AVR.Build.0 = Debug|AVR
+		{4F0C1D92-6A5B-4E33-9A71-2C8F5B0D47AE}.Release|AVR.ActiveCfg = Release|AVR
+		{4F0C1D92-6A5B-4E33-9A71-2C8F5B0D47AE}.Release|AVR.Build.0 = Release|AVR
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

ide/fantemp.cppproj

@@ -0,0 +1,140 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="14.0">
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectVersion>7.0</ProjectVersion>
+    <ToolchainName>com.Atmel.AVRGCC8.CPP</ToolchainName>
+    <ProjectGuid>4f0c1d92-6a5b-4e33-9a71-2c8f5b0d47ae</ProjectGuid>
+    <avrdevice>ATmega328P</avrdevice>
+    <avrdeviceseries>none</avrdeviceseries>
+    <OutputType>Executable</OutputType>
+    <Language>CPP</Language>
+    <OutputFileName>$(MSBuildProjectName)</OutputFileName>
+    <OutputFileExtension>.elf</OutputFileExtension>
+    <OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory>
+    <AssemblyName>fantemp</AssemblyName>
+    <Name>fantemp</Name>
+    <RootNamespace>fantemp</RootNamespace>
+    <ToolchainFlavour>avr-g++-16.1.0</ToolchainFlavour>
+    <KeepTimersRunning>true</KeepTimersRunning>
+    <OverrideVtor>false</OverrideVtor>
+    <CacheFlash>true</CacheFlash>
+    <ProgFlashFromRam>true</ProgFlashFromRam>
+    <RamSnippetAddress>0x20000000</RamSnippetAddress>
+    <UncachedRange />
+    <preserveEEPROM>true</preserveEEPROM>
+    <OverrideVtorValue>exception_table</OverrideVtorValue>
+    <BootSegment>2</BootSegment>
+    <ResetRule>0</ResetRule>
+    <eraseonlaunchrule>0</eraseonlaunchrule>
+    <EraseKey />
+    <AsfFrameworkConfig>
+      <framework-data xmlns="">
+  <options />
+  <configurations />
+  <files />
+  <documentation help="" />
+  <offline-documentation help="" />
+  <dependencies>
+    <content-extension eid="atmel.asf" uuidref="Atmel.ASF" version="3.52.0" />
+  </dependencies>
+</framework-data>
+    </AsfFrameworkConfig>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+    <ToolchainSettings>
+      <AvrGccCpp>
+        <avrgcc.common.Device>-mmcu=atmega328p</avrgcc.common.Device>
+        <avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
+        <avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
+        <avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
+        <avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
+        <avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
+        <avrgcccpp.compiler.symbols.DefSymbols>
+          <ListValues>
+            <Value>NDEBUG</Value>
+          </ListValues>
+        </avrgcccpp.compiler.symbols.DefSymbols>
+        <avrgcccpp.compiler.directories.IncludePaths>
+          <ListValues>
+            <Value>$(MSBuildProjectDirectory)\..\..\libavr\include</Value>
+          </ListValues>
+        </avrgcccpp.compiler.directories.IncludePaths>
+        <avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level>
+        <avrgcccpp.compiler.optimization.PrepareFunctionsForGarbageCollection>True</avrgcccpp.compiler.optimization.PrepareFunctionsForGarbageCollection>
+        <avrgcccpp.compiler.optimization.PrepareDataForGarbageCollection>True</avrgcccpp.compiler.optimization.PrepareDataForGarbageCollection>
+        <avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
+        <avrgcccpp.compiler.miscellaneous.OtherFlags>-std=c++26 -Wextra -mrelax -fno-exceptions -fno-rtti -fno-threadsafe-statics</avrgcccpp.compiler.miscellaneous.OtherFlags>
+        <avrgcccpp.linker.optimization.GarbageCollectUnusedSections>True</avrgcccpp.linker.optimization.GarbageCollectUnusedSections>
+        <avrgcccpp.linker.miscellaneous.LinkerFlags>-mrelax</avrgcccpp.linker.miscellaneous.LinkerFlags>
+      </AvrGccCpp>
+    </ToolchainSettings>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+    <ToolchainSettings>
+      <AvrGccCpp>
+        <avrgcc.common.Device>-mmcu=atmega328p</avrgcc.common.Device>
+        <avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
+        <avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
+        <avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
+        <avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
+        <avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
+        <avrgcccpp.compiler.symbols.DefSymbols>
+          <ListValues>
+            <Value>DEBUG</Value>
+          </ListValues>
+        </avrgcccpp.compiler.symbols.DefSymbols>
+        <avrgcccpp.compiler.directories.IncludePaths>
+          <ListValues>
+            <Value>$(MSBuildProjectDirectory)\..\..\libavr\include</Value>
+          </ListValues>
+        </avrgcccpp.compiler.directories.IncludePaths>
+        <avrgcccpp.compiler.optimization.level>Optimize debugging experience (-Og)</avrgcccpp.compiler.optimization.level>
+        <avrgcccpp.compiler.optimization.PrepareFunctionsForGarbageCollection>True</avrgcccpp.compiler.optimization.PrepareFunctionsForGarbageCollection>
+        <avrgcccpp.compiler.optimization.PrepareDataForGarbageCollection>True</avrgcccpp.compiler.optimization.PrepareDataForGarbageCollection>
+        <avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
+        <avrgcccpp.compiler.miscellaneous.OtherFlags>-std=c++26 -Wextra -mrelax -fno-exceptions -fno-rtti -fno-threadsafe-statics -gdwarf-4</avrgcccpp.compiler.miscellaneous.OtherFlags>
+        <avrgcccpp.linker.optimization.GarbageCollectUnusedSections>True</avrgcccpp.linker.optimization.GarbageCollectUnusedSections>
+        <avrgcccpp.linker.miscellaneous.LinkerFlags>-mrelax</avrgcccpp.linker.miscellaneous.LinkerFlags>
+      </AvrGccCpp>
+    </ToolchainSettings>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="..\src\board.hpp">
+      <SubType>compile</SubType>
+      <Link>src\board.hpp</Link>
+    </Compile>
+    <Compile Include="..\src\bootloader.hpp">
+      <SubType>compile</SubType>
+      <Link>src\bootloader.hpp</Link>
+    </Compile>
+    <Compile Include="..\src\controller.hpp">
+      <SubType>compile</SubType>
+      <Link>src\controller.hpp</Link>
+    </Compile>
+    <Compile Include="..\src\curve.hpp">
+      <SubType>compile</SubType>
+      <Link>src\curve.hpp</Link>
+    </Compile>
+    <Compile Include="..\src\main.cpp">
+      <SubType>compile</SubType>
+      <Link>src\main.cpp</Link>
+    </Compile>
+    <Compile Include="..\src\statistics.hpp">
+      <SubType>compile</SubType>
+      <Link>src\statistics.hpp</Link>
+    </Compile>
+    <Compile Include="..\src\terminal.hpp">
+      <SubType>compile</SubType>
+      <Link>src\terminal.hpp</Link>
+    </Compile>
+    <Compile Include="..\src\thermistor.hpp">
+      <SubType>compile</SubType>
+      <Link>src\thermistor.hpp</Link>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="src" />
+  </ItemGroup>
+  <Import Project="$(AVRSTUDIO_EXE_PATH)\Vs\Compiler.targets" />
+</Project>