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ide: the attiny85 beside the atmega328p, one directory each

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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>
This commit is contained in:
BlackMark
2026-07-27 19:51:50 +02:00
committed by BlackMark
parent dc89d0779a
commit 0ecd53856b
5 changed files with 149 additions and 24 deletions
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6
.gitignore vendored
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@@ -2,8 +2,8 @@ build/
.cache/ .cache/
# Atmel Studio: generated per machine, its build outputs, and per-user state # Atmel Studio: generated per machine, its build outputs, and per-user state
ide/*.componentinfo.xml ide/*/*.componentinfo.xml
ide/Debug/ ide/*/Debug/
ide/Release/ ide/*/Release/
ide/.vs/ ide/.vs/
ide/*.log ide/*.log

31
README.md
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@@ -27,11 +27,17 @@ reflect). The legacy yazoalfa-based driver lives on the `master` branch.
## Atmel Studio ## Atmel Studio
`master` carries a Studio solution, so this branch does too: `ide/ds3231.atsln` `master` carries a Studio solution, so this branch does too: `ide/ds3231.atsln`
builds `example/main.cpp` for the ATmega328P — the chip that solution targeted — builds `example/main.cpp` for both parts the presets cover, each to a
to a **byte-identical `.text`** (1242 B) against the CMake build, with the flags **byte-identical `.text`** against the CMake build — 1242 B on the ATmega328P,
mirrored by hand. One project, one chip: `avrdevice` is a project-level property 1212 B on the ATtiny85 — with the flags mirrored by hand. CMake remains the
in Studio, so the attiny85 half of the presets has no equivalent here, and CMake build system.
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 Studio expects libavr checked out **beside this repo** and finds it at
`$(MSBuildProjectDirectory)\..\..\libavr\include` — anchored to the project, `$(MSBuildProjectDirectory)\..\..\libavr\include` — anchored to the project,
@@ -45,15 +51,20 @@ 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/`): checks the flags have not drifted (both from libavr's `tools/atmelstudio/`):
```sh ```sh
for mcu in atmega328p attiny85; do
case $mcu in atmega328p) device=ATmega328P;; attiny85) device=ATtiny85;; esac
python ../libavr/tools/atmelstudio/componentinfo.py \ python ../libavr/tools/atmelstudio/componentinfo.py \
ide/ds3231.componentinfo.xml --device ATmega328P "ide/$mcu/ds3231-$mcu.componentinfo.xml" --device "$device"
python ../libavr/tools/atmelstudio/check-flags.py --solution ide/ds3231.atsln \ python ../libavr/tools/atmelstudio/check-flags.py --solution ide/ds3231.atsln \
--compile-commands build/atmega328p-generated/compile_commands.json \ --project "ds3231-$mcu" \
--log build/atmelstudio.log --compile-commands "build/$mcu-generated/compile_commands.json" \
--log "build/as-$mcu.log"
done
``` ```
Release is what the gate compares, the presets defining no debug build; Debug One reference describes one part, hence `--project`. Release is what the gate
carries the `-Og -gdwarf-4` pair libavr's own debug preset uses. 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

16
ide/ds3231.cppproj → ide/atmega328p/ds3231-atmega328p.cppproj
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@@ -12,8 +12,8 @@
<OutputFileName>$(MSBuildProjectName)</OutputFileName> <OutputFileName>$(MSBuildProjectName)</OutputFileName>
<OutputFileExtension>.elf</OutputFileExtension> <OutputFileExtension>.elf</OutputFileExtension>
<OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory> <OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory>
<AssemblyName>ds3231</AssemblyName> <AssemblyName>ds3231-atmega328p</AssemblyName>
<Name>ds3231</Name> <Name>ds3231-atmega328p</Name>
<RootNamespace>ds3231</RootNamespace> <RootNamespace>ds3231</RootNamespace>
<ToolchainFlavour>avr-g++-16.1.0</ToolchainFlavour> <ToolchainFlavour>avr-g++-16.1.0</ToolchainFlavour>
<KeepTimersRunning>true</KeepTimersRunning> <KeepTimersRunning>true</KeepTimersRunning>
@@ -45,8 +45,8 @@
</avrgcccpp.compiler.symbols.DefSymbols> </avrgcccpp.compiler.symbols.DefSymbols>
<avrgcccpp.compiler.directories.IncludePaths> <avrgcccpp.compiler.directories.IncludePaths>
<ListValues> <ListValues>
<Value>$(MSBuildProjectDirectory)\..\include</Value> <Value>$(MSBuildProjectDirectory)\..\..\include</Value>
<Value>$(MSBuildProjectDirectory)\..\..\libavr\include</Value> <Value>$(MSBuildProjectDirectory)\..\..\..\libavr\include</Value>
</ListValues> </ListValues>
</avrgcccpp.compiler.directories.IncludePaths> </avrgcccpp.compiler.directories.IncludePaths>
<avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level> <avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level>
@@ -75,8 +75,8 @@
</avrgcccpp.compiler.symbols.DefSymbols> </avrgcccpp.compiler.symbols.DefSymbols>
<avrgcccpp.compiler.directories.IncludePaths> <avrgcccpp.compiler.directories.IncludePaths>
<ListValues> <ListValues>
<Value>$(MSBuildProjectDirectory)\..\include</Value> <Value>$(MSBuildProjectDirectory)\..\..\include</Value>
<Value>$(MSBuildProjectDirectory)\..\..\libavr\include</Value> <Value>$(MSBuildProjectDirectory)\..\..\..\libavr\include</Value>
</ListValues> </ListValues>
</avrgcccpp.compiler.directories.IncludePaths> </avrgcccpp.compiler.directories.IncludePaths>
<avrgcccpp.compiler.optimization.level>Optimize debugging experience (-Og)</avrgcccpp.compiler.optimization.level> <avrgcccpp.compiler.optimization.level>Optimize debugging experience (-Og)</avrgcccpp.compiler.optimization.level>
@@ -90,11 +90,11 @@
</ToolchainSettings> </ToolchainSettings>
</PropertyGroup> </PropertyGroup>
<ItemGroup> <ItemGroup>
<Compile Include="..\example\main.cpp"> <Compile Include="..\..\example\main.cpp">
<SubType>compile</SubType> <SubType>compile</SubType>
<Link>example\main.cpp</Link> <Link>example\main.cpp</Link>
</Compile> </Compile>
<Compile Include="..\include\ds3231\ds3231.hpp"> <Compile Include="..\..\include\ds3231\ds3231.hpp">
<SubType>compile</SubType> <SubType>compile</SubType>
<Link>include\ds3231\ds3231.hpp</Link> <Link>include\ds3231\ds3231.hpp</Link>
</Compile> </Compile>

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>

8
ide/ds3231.atsln
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@@ -3,7 +3,9 @@ Microsoft Visual Studio Solution File, Format Version 12.00
# Atmel Studio Solution File, Format Version 11.00 # Atmel Studio Solution File, Format Version 11.00
VisualStudioVersion = 14.0.23107.0 VisualStudioVersion = 14.0.23107.0
MinimumVisualStudioVersion = 10.0.40219.1 MinimumVisualStudioVersion = 10.0.40219.1
Project("{E66E83B9-2572-4076-B26E-6BE79FF3018A}") = "ds3231", "ds3231.cppproj", "{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}" 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 EndProject
Global Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -15,6 +17,10 @@ Global
{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}.Debug|AVR.Build.0 = 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.ActiveCfg = Release|AVR
{7B3E5A41-9C26-4D18-8F52-6A0D31C74BE9}.Release|AVR.Build.0 = 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 EndGlobalSection
GlobalSection(SolutionProperties) = preSolution GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE HideSolutionNode = FALSE