diff --git a/.gitignore b/.gitignore
index 38e936d..9f584cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,10 @@
 Release
 Debug
 *.componentinfo.xml
-avrdude.bat
+*.elf
+*.o
+*.hex
+*.srec
+*.eeprom
+*.lss
+*.map
diff --git a/io/clock.h b/io/clock.hpp
similarity index 100%
rename from io/clock.h
rename to io/clock.hpp
diff --git a/io/io b/io/io
index 86d1db2..d991959 160000
--- a/io/io
+++ b/io/io
@@ -1 +1 @@
-Subproject commit 86d1db21f76399843cc0563e757b31a2511547cc
+Subproject commit d991959bff8d239abd019741e956f59d270e1ba8
diff --git a/io/io.cppproj b/io/io.cppproj
index 323957f..3a5560c 100644
--- a/io/io.cppproj
+++ b/io/io.cppproj
@@ -75,120 +75,76 @@
   <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
     <ToolchainSettings>
       <AvrGccCpp>
-        <avrgcc.common.Device>-mmcu=atmega328p -B "%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\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>
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-        <avrgcc.compiler.directories.IncludePaths>
-          <ListValues>
-            <Value>%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\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>
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-        <avrgcccpp.compiler.directories.IncludePaths>
-          <ListValues>
-            <Value>%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\include</Value>
-          </ListValues>
-        </avrgcccpp.compiler.directories.IncludePaths>
-        <avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
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-        <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++17</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\1.3.300\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>
+  <avrgcc.common.Device>-mmcu=atmega328p -B "%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\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\1.3.300\include</Value></ListValues></avrgcc.compiler.directories.IncludePaths>
+  <avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
+  <avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
+  <avrgcc.compiler.warnings.ExtraWarnings>True</avrgcc.compiler.warnings.ExtraWarnings>
+  <avrgcc.compiler.warnings.Pedantic>True</avrgcc.compiler.warnings.Pedantic>
+  <avrgcc.compiler.miscellaneous.OtherFlags>-fno-threadsafe-statics -std=c11</avrgcc.compiler.miscellaneous.OtherFlags>
+  <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\1.3.300\include</Value></ListValues></avrgcccpp.compiler.directories.IncludePaths>
+  <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>-fno-threadsafe-statics -Wextra -std=c++17</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\1.3.300\include</Value></ListValues></avrgcccpp.assembler.general.IncludePaths>
+  <avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
+  <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>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
     <ToolchainSettings>
       <AvrGccCpp>
-        <avrgcc.common.Device>-mmcu=atmega328p -B "%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\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\1.3.300\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\1.3.300\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++17</avrgcccpp.compiler.miscellaneous.OtherFlags>
-        <avrgcccpp.linker.libraries.Libraries>
-          <ListValues>
-            <Value>libm</Value>
-          </ListValues>
-        </avrgcccpp.linker.libraries.Libraries>
-        <avrgcccpp.assembler.general.IncludePaths>
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-            <Value>%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\include</Value>
-          </ListValues>
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-        <avrgcccpp.compiler.optimization.DebugLevel>Default (-g2)</avrgcccpp.compiler.optimization.DebugLevel>
-        <avrgcccpp.assembler.debugging.DebugLevel>Default (-Wa,-g)</avrgcccpp.assembler.debugging.DebugLevel>
-      </AvrGccCpp>
+  <avrgcc.common.Device>-mmcu=atmega328p -B "%24(PackRepoDir)\Atmel\ATmega_DFP\1.3.300\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\1.3.300\include</Value></ListValues></avrgcc.compiler.directories.IncludePaths>
+  <avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
+  <avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
+  <avrgcc.compiler.warnings.ExtraWarnings>True</avrgcc.compiler.warnings.ExtraWarnings>
+  <avrgcc.compiler.warnings.Pedantic>True</avrgcc.compiler.warnings.Pedantic>
+  <avrgcc.compiler.miscellaneous.OtherFlags>-fno-threadsafe-statics -std=c11</avrgcc.compiler.miscellaneous.OtherFlags>
+  <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\1.3.300\include</Value></ListValues></avrgcccpp.compiler.directories.IncludePaths>
+  <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>-fno-threadsafe-statics -Wextra -std=c++17</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\1.3.300\include</Value></ListValues></avrgcccpp.assembler.general.IncludePaths>
+  <avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
+  <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>Maximum (-g3)</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>
   </PropertyGroup>
   <ItemGroup>
-    <Compile Include="clock.h">
+    <Compile Include="clock.hpp">
       <SubType>compile</SubType>
     </Compile>
     <Compile Include="io\io.hpp">
diff --git a/io/main.cpp b/io/main.cpp
index b9deeb1..997bded 100644
--- a/io/main.cpp
+++ b/io/main.cpp
@@ -1,4 +1,4 @@
-#include "clock.h"
+#include "clock.hpp"
 
 #include "io/io.hpp"