commit e9e2cf2e63d08a5fb9b90e5c5436a286e2bab356
Author: BlackMark <me@blackmark.me>
Date:   Wed Apr 26 23:18:17 2017 +0200

    Initial commit

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..3e5b64f
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+*.h         eol=lf
+*.hpp       eol=lf
+*.c         eol=lf
+*.cpp       eol=lf
+.git*       eol=lf
+*.vcxproj*  eol=crlf
+*.cppproj   eol=crlf
+*.sln       eol=crlf
+*.atsln     eol=crlf
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..38e936d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.vs
+Release
+Debug
+*.componentinfo.xml
+avrdude.bat
diff --git a/ds3231.atsln b/ds3231.atsln
new file mode 100644
index 0000000..74635dc
--- /dev/null
+++ b/ds3231.atsln
@@ -0,0 +1,22 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Atmel Studio Solution File, Format Version 11.00
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{E66E83B9-2572-4076-B26E-6BE79FF3018A}") = "ds3231", "ds3231\ds3231.cppproj", "{DCE6C7E3-EE26-4D79-826B-08594B9AD897}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|AVR = Debug|AVR
+		Release|AVR = Release|AVR
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Debug|AVR.ActiveCfg = Debug|AVR
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Debug|AVR.Build.0 = Debug|AVR
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Release|AVR.ActiveCfg = Release|AVR
+		{DCE6C7E3-EE26-4D79-826B-08594B9AD897}.Release|AVR.Build.0 = Release|AVR
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal
diff --git a/ds3231/ds3231.cppproj b/ds3231/ds3231.cppproj
new file mode 100644
index 0000000..d2efcd0
--- /dev/null
+++ b/ds3231/ds3231.cppproj
@@ -0,0 +1,145 @@
+<?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>dce6c7e3-ee26-4d79-826b-08594b9ad897</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</AssemblyName>
+    <Name>ds3231</Name>
+    <RootNamespace>ds3231</RootNamespace>
+    <ToolchainFlavour>Native</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>
+    <eraseonlaunchrule>0</eraseonlaunchrule>
+    <AsfFrameworkConfig>
+      <framework-data xmlns="">
+  <options />
+  <configurations />
+  <files />
+  <documentation help="" />
+  <offline-documentation help="" />
+  <dependencies>
+    <content-extension eid="atmel.asf" uuidref="Atmel.ASF" version="3.34.2" />
+  </dependencies>
+</framework-data>
+    </AsfFrameworkConfig>
+    <avrtool>com.atmel.avrdbg.tool.simulator</avrtool>
+    <avrtoolserialnumber />
+    <avrdeviceexpectedsignature>0x1E950F</avrdeviceexpectedsignature>
+    <custom>
+      <ToolOptions>
+        <InterfaceProperties>
+        </InterfaceProperties>
+        <InterfaceName>
+        </InterfaceName>
+      </ToolOptions>
+      <ToolType>custom</ToolType>
+      <ToolNumber>
+      </ToolNumber>
+      <ToolName>Custom Programming Tool</ToolName>
+    </custom>
+    <avrtoolinterface />
+    <com_atmel_avrdbg_tool_simulator>
+      <ToolOptions xmlns="">
+        <InterfaceProperties>
+        </InterfaceProperties>
+        <InterfaceName>
+        </InterfaceName>
+      </ToolOptions>
+      <ToolType xmlns="">com.atmel.avrdbg.tool.simulator</ToolType>
+      <ToolNumber xmlns="">
+      </ToolNumber>
+      <ToolName xmlns="">Simulator</ToolName>
+    </com_atmel_avrdbg_tool_simulator>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
+    <ToolchainSettings>
+      <AvrGccCpp>
+  <avrgcc.common.Device>-mmcu=atmega328p -B "%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\gcc\dev\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>
+  <avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
+  <avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
+  <avrgcc.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcc.compiler.directories.IncludePaths>
+  <avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
+  <avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
+  <avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
+  <avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
+  <avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
+  <avrgcccpp.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.compiler.directories.IncludePaths>
+  <avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
+  <avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
+  <avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
+  <avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
+  <avrgcccpp.compiler.miscellaneous.OtherFlags>-Wextra -std=c++11</avrgcccpp.compiler.miscellaneous.OtherFlags>
+  <avrgcccpp.linker.libraries.Libraries><ListValues><Value>libm</Value></ListValues></avrgcccpp.linker.libraries.Libraries>
+  <avrgcccpp.assembler.general.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.assembler.general.IncludePaths>
+  <avrgcc.compiler.symbols.DefSymbols><ListValues><Value>NDEBUG</Value></ListValues></avrgcc.compiler.symbols.DefSymbols>
+  <avrgcc.compiler.optimization.level>Optimize for size (-Os)</avrgcc.compiler.optimization.level>
+  <avrgcccpp.compiler.symbols.DefSymbols><ListValues><Value>NDEBUG</Value></ListValues></avrgcccpp.compiler.symbols.DefSymbols>
+  <avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level>
+</AvrGccCpp>
+    </ToolchainSettings>
+    <PreBuildEvent>echo "C:\avrdude-6.2\avrdude.exe" -v -p$(avrdevice) %%* -Uflash:w:"$(OutputDirectory)\$(Name).hex":i &gt; "$(MSBuildProjectDirectory)\avrdude.bat"</PreBuildEvent>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+    <ToolchainSettings>
+      <AvrGccCpp>
+  <avrgcc.common.Device>-mmcu=atmega328p -B "%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\gcc\dev\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>
+  <avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
+  <avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
+  <avrgcc.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcc.compiler.directories.IncludePaths>
+  <avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
+  <avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
+  <avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
+  <avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
+  <avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
+  <avrgcccpp.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.compiler.directories.IncludePaths>
+  <avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
+  <avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
+  <avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
+  <avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
+  <avrgcccpp.compiler.miscellaneous.OtherFlags>-Wextra -std=c++11</avrgcccpp.compiler.miscellaneous.OtherFlags>
+  <avrgcccpp.linker.libraries.Libraries><ListValues><Value>libm</Value></ListValues></avrgcccpp.linker.libraries.Libraries>
+  <avrgcccpp.assembler.general.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.assembler.general.IncludePaths>
+  <avrgcc.compiler.symbols.DefSymbols><ListValues><Value>DEBUG</Value></ListValues></avrgcc.compiler.symbols.DefSymbols>
+  <avrgcc.compiler.optimization.level>Optimize (-O1)</avrgcc.compiler.optimization.level>
+  <avrgcc.compiler.optimization.DebugLevel>Default (-g2)</avrgcc.compiler.optimization.DebugLevel>
+  <avrgcccpp.compiler.symbols.DefSymbols><ListValues><Value>DEBUG</Value></ListValues></avrgcccpp.compiler.symbols.DefSymbols>
+  <avrgcccpp.compiler.optimization.level>Optimize (-O1)</avrgcccpp.compiler.optimization.level>
+  <avrgcccpp.compiler.optimization.DebugLevel>Default (-g2)</avrgcccpp.compiler.optimization.DebugLevel>
+  <avrgcccpp.assembler.debugging.DebugLevel>Default (-Wa,-g)</avrgcccpp.assembler.debugging.DebugLevel>
+</AvrGccCpp>
+    </ToolchainSettings>
+    <PreBuildEvent>echo "C:\avrdude-6.2\avrdude.exe" -v -p$(avrdevice) %%* -Uflash:w:"$(OutputDirectory)\$(Name).hex":i &gt; "$(MSBuildProjectDirectory)\avrdude.bat"</PreBuildEvent>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="main.cpp">
+      <SubType>compile</SubType>
+    </Compile>
+  </ItemGroup>
+  <Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
+</Project>
\ No newline at end of file
diff --git a/ds3231/main.cpp b/ds3231/main.cpp
new file mode 100644
index 0000000..e69de29