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compare: avr:0ecd53856ba7e7418cbafe2f857f43e25299cd07
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Author SHA1 Message Date
BlackMark
0ecd53856b ide: the attiny85 beside the atmega328p, one directory each 
The presets cover both parts, so the solution should too. Studio carries
avrdevice as a project property, so a part is a project rather than a
configuration, and both build example/main.cpp to a .text byte-identical to
their CMake counterpart: 1242 B on the mega, 1212 B on the tiny, each with the
architecture its own object file says.

They need separate directories, not just separate names. Studio builds into
<project dir>/<Configuration> whatever OutputDirectory claims — setting it per
project creates the directory and then ignores it — so two projects in one
directory share example/main.o. Verified rather than assumed: with both in ide/,
the single shared object read avr:25 while the mega's ELF read avr:5, so a
build of one after the other without a rebuild links the wrong part's object.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
 2026-07-27 19:51:50 +02:00
BlackMark
dc89d0779a ide: the Atmel Studio solution master has, on the libavr port 
master opens in Studio, so this branch should too. The solution builds
example/main.cpp — the port's only executable, the driver itself being an
INTERFACE library — for the ATmega328P that solution targeted, and the
acceptance is not that it builds but that it builds the same firmware: .text
comes out byte-identical to CMake's at 1242 B.

One project, one chip. Studio carries avrdevice as a project property, so the
attiny85 half of the presets would need a second project rather than a second
configuration; CMake stays the build system and covers both.

libavr is found beside this repo, anchored to the project directory rather than
written relative to the generated makefile, which runs from the configuration's
output directory. No LIBAVR_ROOT: a variable exported in a shell is invisible to
Studio launched from the Start menu.

Both configurations verified headless with LIBAVR_ROOT unset, and the flag
mirror checked against the CMake build's own compile_commands.json.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
 2026-07-27 19:33:39 +02:00
5 changed files with 293 additions and 0 deletions
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7
.gitignore vendored
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@@ -1,2 +1,9 @@
build/ build/
.cache/ .cache/
# Atmel Studio: generated per machine, its build outputs, and per-user state
ide/*/*.componentinfo.xml
ide/*/Debug/
ide/*/Release/
ide/.vs/
ide/*.log

42
README.md
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@@ -24,6 +24,48 @@ cmake --build --preset attiny85-generated
Presets cover attiny85/atmega328p in both libavr modes (generated and Presets cover attiny85/atmega328p in both libavr modes (generated and
reflect). The legacy yazoalfa-based driver lives on the `master` branch. reflect). The legacy yazoalfa-based driver lives on the `master` branch.
## Atmel Studio
`master` carries a Studio solution, so this branch does too: `ide/ds3231.atsln`
builds `example/main.cpp` for both parts the presets cover, each to a
**byte-identical `.text`** against the CMake build — 1242 B on the ATmega328P,
1212 B on the ATtiny85 — with the flags mirrored by hand. CMake remains the
build system.
`avrdevice` is a project-level property in Studio, so a part means a project, not
a configuration: `ide/atmega328p/` and `ide/attiny85/`. They need separate
directories rather than separate names — Studio builds into `<project
dir>/<Configuration>` whatever `OutputDirectory` says, so two projects sharing
one directory would also share one `example/main.o`, and building one after the
other without a rebuild would link the other part's object.
Studio expects libavr checked out **beside this repo** and finds it at
`$(MSBuildProjectDirectory)\..\..\libavr\include` — anchored to the project,
because a plain relative path is resolved against the generated makefile's
directory (the configuration's output directory), not the project's. There is no
`LIBAVR_ROOT` escape hatch: a variable exported in a shell is invisible to Studio
launched from the Start menu. It also needs a GCC 16.1 toolchain registered as
flavour `avr-g++-16.1.0`, nothing older reaching `-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
for mcu in atmega328p attiny85; do
case $mcu in atmega328p) device=ATmega328P;; attiny85) device=ATtiny85;; esac
python ../libavr/tools/atmelstudio/componentinfo.py \
"ide/$mcu/ds3231-$mcu.componentinfo.xml" --device "$device"
python ../libavr/tools/atmelstudio/check-flags.py --solution ide/ds3231.atsln \
--project "ds3231-$mcu" \
--compile-commands "build/$mcu-generated/compile_commands.json" \
--log "build/as-$mcu.log"
done
```
One reference describes one part, hence `--project`. Release is what the gate
compares, the presets defining no debug build; Debug carries the `-Og
-gdwarf-4` pair libavr's own debug preset uses.
Differences from legacy: weekday-rate alarms now actually set the DY bit Differences from legacy: weekday-rate alarms now actually set the DY bit
(the old `setAlarmHelper` always cleared it), reads/writes are single (the old `setAlarmHelper` always cleared it), reads/writes are single
coherent bus transactions, and errors are reported instead of ignored. coherent bus transactions, and errors are reported instead of ignored.

108
ide/atmega328p/ds3231-atmega328p.cppproj Normal file
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@@ -0,0 +1,108 @@
<?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>7b3e5a41-9c26-4d18-8f52-6a0d31c74be9</ProjectGuid>
<avrdevice>ATmega328P</avrdevice>
<avrdeviceseries>none</avrdeviceseries>
<OutputType>Executable</OutputType>
<Language>CPP</Language>
<OutputFileName>$(MSBuildProjectName)</OutputFileName>
<OutputFileExtension>.elf</OutputFileExtension>
<OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory>
<AssemblyName>ds3231-atmega328p</AssemblyName>
<Name>ds3231-atmega328p</Name>
<RootNamespace>ds3231</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 />
</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)\..\..\include</Value>
<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>$(MSBuildProjectDirectory)\..\..\include</Value>
<Value>$(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="..\..\example\main.cpp">
<SubType>compile</SubType>
<Link>example\main.cpp</Link>
</Compile>
<Compile Include="..\..\include\ds3231\ds3231.hpp">
<SubType>compile</SubType>
<Link>include\ds3231\ds3231.hpp</Link>
</Compile>
</ItemGroup>
<ItemGroup>
<Folder Include="example" />
<Folder Include="include" />
<Folder Include="include\ds3231" />
</ItemGroup>
<Import Project="$(AVRSTUDIO_EXE_PATH)\Vs\Compiler.targets" />
</Project>

108
ide/attiny85/ds3231-attiny85.cppproj Normal file
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@@ -0,0 +1,108 @@
<?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>1d84c0f7-52b9-4a63-b7e1-9f2c48d5a306</ProjectGuid>
<avrdevice>ATtiny85</avrdevice>
<avrdeviceseries>none</avrdeviceseries>
<OutputType>Executable</OutputType>
<Language>CPP</Language>
<OutputFileName>$(MSBuildProjectName)</OutputFileName>
<OutputFileExtension>.elf</OutputFileExtension>
<OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory>
<AssemblyName>ds3231-attiny85</AssemblyName>
<Name>ds3231-attiny85</Name>
<RootNamespace>ds3231</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 />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
<ToolchainSettings>
<AvrGccCpp>
<avrgcc.common.Device>-mmcu=attiny85</avrgcc.common.Device>
<avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
<avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
<avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
<avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
<avrgcccpp.compiler.symbols.DefSymbols>
<ListValues>
<Value>NDEBUG</Value>
</ListValues>
</avrgcccpp.compiler.symbols.DefSymbols>
<avrgcccpp.compiler.directories.IncludePaths>
<ListValues>
<Value>$(MSBuildProjectDirectory)\..\..\include</Value>
<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=attiny85</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>$(MSBuildProjectDirectory)\..\..\include</Value>
<Value>$(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="..\..\example\main.cpp">
<SubType>compile</SubType>
<Link>example\main.cpp</Link>
</Compile>
<Compile Include="..\..\include\ds3231\ds3231.hpp">
<SubType>compile</SubType>
<Link>include\ds3231\ds3231.hpp</Link>
</Compile>
</ItemGroup>
<ItemGroup>
<Folder Include="example" />
<Folder Include="include" />
<Folder Include="include\ds3231" />
</ItemGroup>
<Import Project="$(AVRSTUDIO_EXE_PATH)\Vs\Compiler.targets" />
</Project>

28
ide/ds3231.atsln Normal file
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@@ -0,0 +1,28 @@
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}") = "ds3231-atmega328p", "atmega328p\ds3231-atmega328p.cppproj", "{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}"
EndProject
Project("{E66E83B9-2572-4076-B26E-6BE79FF3018A}") = "ds3231-attiny85", "attiny85\ds3231-attiny85.cppproj", "{1D84C0F7-52B9-4A63-B7E1-9F2C48D5A306}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|AVR = Debug|AVR
Release|AVR = Release|AVR
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}.Debug|AVR.ActiveCfg = Debug|AVR
{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}.Debug|AVR.Build.0 = Debug|AVR
{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}.Release|AVR.ActiveCfg = Release|AVR
{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}.Release|AVR.Build.0 = Release|AVR
{1D84C0F7-52B9-4A63-B7E1-9F2C48D5A306}.Debug|AVR.ActiveCfg = Debug|AVR
{1D84C0F7-52B9-4A63-B7E1-9F2C48D5A306}.Debug|AVR.Build.0 = Debug|AVR
{1D84C0F7-52B9-4A63-B7E1-9F2C48D5A306}.Release|AVR.ActiveCfg = Release|AVR
{1D84C0F7-52B9-4A63-B7E1-9F2C48D5A306}.Release|AVR.Build.0 = Release|AVR
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal